KINDAI UNIVERSITY


*A space between the first name and last name, please enter

HASHISHIN Yuichi

Profile

FacultyDepartment of Electric and Electronic Engineering / Graduate School of Science and Engineering Research
PositionProfessor
Degree
Commentator Guidehttps://www.kindai.ac.jp/meikan/290-hashishin-yuuichi.html
URL
Mail
Last Updated :2020/04/03

Education and Career

Academic & Professional Experience

  •   1982 04 ,  - 現在, School of Science & Engineering, Kindai University
  •   1989 ,  - 1990 , Visiting Scientist, State University of New York at Buffalo

Research Activities

Research Areas

  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Electronic devices and equipment

Research Interests

  • Laser Safety, Medical Laser, Applied Laser Engineering

Misc

  • 皮膚科・形成外科の疾患と治療 タトゥーのレーザー除去に関する問題点, 橋新裕一, Medical Photonics, 26, 48‐54,9,   2018 07 20 , http://jglobal.jst.go.jp/public/201802214636077467
  • He‐Neレーザーの繊維状組織からの反射光の偏光特性, 橋新裕一, 橋新裕一, 佐野秀, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 65th, ROMBUNNO.19p‐A302‐13,   2018 03 05 , http://jglobal.jst.go.jp/public/201802218982477519
  • 裏面に生じた錆のレーザ誘起音特性による検出, 山口大智, 佐野秀, 橋新裕一, 電気関係学会関西連合大会講演論文集(CD-ROM), 2017, ROMBUNNO.G1‐10,   2017 11 06 , http://jglobal.jst.go.jp/public/201702211572163909
  • レーザの偏光と生体組織, 林純平, 佐野秀, 橋新裕一, 電気関係学会関西連合大会講演論文集(CD-ROM), 2017, ROMBUNNO.G1‐16,   2017 11 06 , http://jglobal.jst.go.jp/public/201702219708705657
  • レーザ誘起音を用いた空隙のイメージング, 廣瀬正和, 佐野秀, 橋新裕一, 電気関係学会関西連合大会講演論文集(CD-ROM), 2017, ROMBUNNO.G1‐18,   2017 11 06 , http://jglobal.jst.go.jp/public/201702236375888064
  • 光が与える生菌への影響, 平田大輝, 佐野秀, 橋新裕一, 電気関係学会関西連合大会講演論文集(CD-ROM), 2017, ROMBUNNO.G1‐1,   2017 11 06 , http://jglobal.jst.go.jp/public/201702255968005856
  • 生体組織のレーザ誘起音特性解析法の検討, 安藤浩和, 佐野秀, 橋新裕一, 電気関係学会関西連合大会講演論文集(CD-ROM), 2017, ROMBUNNO.G1‐17,   2017 11 06 , http://jglobal.jst.go.jp/public/201702259484129279
  • 複合材料のレーザ加工特性, 石栗健大, 佐野秀, 橋新裕一, 電気関係学会関西連合大会講演論文集(CD-ROM), 2017, ROMBUNNO.G1‐9,   2017 11 06 , http://jglobal.jst.go.jp/public/201702265369236453
  • LLC共振型DC/DCコンバータの開発に伴う先行研究の調査結果と研究概要, 井口和大, 井口和大, 橋新裕一, 小山敦, 小原正樹, 電気関係学会関西連合大会講演論文集(CD-ROM), 2017, ROMBUNNO.G4‐28,   2017 11 06 , http://jglobal.jst.go.jp/public/201702274954994285
  • ラマン分光法による農薬有無の青みかんの判別, 田村直紀, 橋新裕一, 村上功, 電気関係学会関西連合大会講演論文集(CD-ROM), 2017, ROMBUNNO.G1‐2,   2017 11 06 , http://jglobal.jst.go.jp/public/201702277171299104
  • Consideration points on the design and manufacture of Laser Products, 橋新 裕一, Optronics : 光技術コーディネートジャーナル, 36, 1, 83, 87,   2017 01 , http://ci.nii.ac.jp/naid/40021063834
  • Development of CW CO2 laser percussion technique, S. Sano, Y. Hashishin, T. Nakayama, IFMBE Proceedings, 35 IFMBE, 296, 299,   2011 07 11 , 10.1007/978-3-642-21729-6_77, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=79959937642&origin=inward
    Summary:Biological tissue has a complex structure consisting of various kinds of tissues. CO2laser radiation is strongly absorbed by the water in biological tissue. It is thus used to make incisions in biological tissue. However, the desired incision cannot be made when the state of the biological tissue (especially, its water content) varies during irradiation. It is thus necessary to monitor the state of tissue during laser irradiation. The present study considers laser-induced sound. When a laser beam is used to irradiate biological tissue, the water in the tissue absorbs the laser energy. The temperature of the irradiated region increases, causing the tissue to expand rapidly and eventually explode. Laser-induced sound is simultaneously generated. Laser scalpels are currently used as a form of laser treatment. This laser-induced sound is thought to contain information about the kind of biological tissue being irradiated and its state. In the present study, the kind of the sample and information about its state are obtained by irradiating simulated body tissues by a CW (Continuous Wave) CO2laser beam and analyzing the generated laser-induced sound. The results reveal that it should be possible to identify the sample being irradiated in real time by analyzing the laser-induced sound characteristics, which differ according to the kind and the state of the tissue. © 2011 Springer-Verlag.
  • Laser ablation of biological tissue using pulsed CO2laser, Yuichi Hashishin, Shu Sano, Takeyoshi Nakayama, AIP Conference Proceedings, 1282, 63, 66,   2010 12 13 , 10.1063/1.3508558, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=78649840557&origin=inward
    Summary:Laser scalpels are currently used as a form of laser treatment. However, their ablation mechanism has not been clarified because laser excision of biological tissue occurs over a short time scale. Biological tissue ablation generates sound (laser-induced sound). This study seeks to clarify the ablation mechanism. The state of the gelatin ablation was determined using a high-speed video camera and the power reduction of a He-Ne laser beam. The aim of this study was to clarify the laser ablation mechanism by observing laser excision using the high-speed video camera and monitoring the power reduction of the He-Ne laser beam. We simulated laser excision of a biological tissue by irradiating gelatin (10 wt%) with radiation from a pulsed CO2laser (wavelength: 10.6 μm; pulse width: 80 ns). In addition, a microphone was used to measure the laser-induced sound. The first pulse caused ablation particles to be emitted in all directions; these particles were subsequently damped so that they formed a mushroom cloud. Furthermore, water was initially evaporated by laser irradiation and then tissue was ejected. © 2010 American Institute of Physics.
  • Comparison of acid resistance of root dentin after treatment with a mid-infrared free electron laser at between λ = 9.0 and 9.7 μm, Manabu Heya, Shu Sano, Hiroaki Kumasaki, Yuichi Hashishin, Kazuhisa Sunada, Kazushi Yoshikawa, Masayoshi Inoue, Hiroshi Horiike, Japanese Journal of Applied Physics, 47, 8622, 8630,   2008 11 14 , 10.1143/JJAP.47.8622, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=58749097065&origin=inward
    Summary:The purpose of this study was to compare the acid resistance of root dentin treated with a free electron laser emitting at between λ = 9.0 and 9.7 urn, corresponding to the absorption peaks due to the phosphate ions. In order to obtain the optimum irradiation time for effective surface modification in the acid resistance test, we measured the temporal behaviors of acoustic wave emission and temperature rise. Lased and unlased samples were immersed in 0.1M lactic acid, and the amount of Ca dissolved in the solution was determined after immersion times of 1-22h. The acid resistances for λ= 9.0 and 9.7 μm increased only until ∼3 h. We conclude that the surface modification of root dentin leads to improved acid resistance, but that this only persists for a few hours. Subsurface modification but not surface modification would be effective in the treatment of root surface caries. © 2008 The Japan Society of Applied Physics.
  • Observation of dynamic absorption properties of wet gelatin around λ = 6.05 μm using a mid-infrared free electron laser, Manabu Heya, Yumiko Iwamoto, Yuichi Hashishin, Kazushi Yoshikawa, Hiroshi Horiike, Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, 46, 1208, 1216,   2007 03 08 , 10.1143/JJAP.46.1208, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=34547913491&origin=inward
    Summary:It is essential for soft tissue cutting to precisely predict the effects of laser irradiation before treatment. The purpose of the present study was to investigate the dynamic absorption coefficients of wet gelatin around λ = 6.05 μm (tuned to the OH bending and amide-I bands) during laser irradiation. Wet gelatin was irradiated by a tunable mid-infrared free electron laser within the wavelength range of 5.6-6.7 μm, The incident fluence was fixed at 3.6 ± 0.3 J/cm2. Structural changes of the irradiated gelatin were observed with an optical microscope. At λ = 6.05 μm, the wet gelatin was efficiently removed due to vaporization of water, and the absorption coefficient during irradiation increased slightly by 30-40% of magnitude from that before irradiation. Thus, we showed the possibility that 6.05-μm-light can predictably remove soft tissue without unexpected effects. A laser system with λ = 6.05 μm is expected to be a novel cutaneous laser. © 2007 The Japan Society of Applied Physics.
  • Influence of assist laser irradiation timing on quality of HAp coating in LALA method, Hirotaka Katayama, Hirotaka Katayama, Keisuke Ishibashi, Keisuke Ishibashi, Masahiro Dodo, Masahiro Dodo, Yuichi Hashishin, Yuichi Hashishin, Masahito Katto, Masahito Katto, Takeyoshi Nakayama, Takeyoshi Nakayama, IEEJ Transactions on Electronics, Information and Systems, 126,   2006 01 01 , 10.1541/ieejeiss.126.1283, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=33750899891&origin=inward
    Summary:In order to create the implant material which has high biocompatibility, a new hydroxyapatite (HAp) coating method, the laser-assisted laser ablation (LALA) method, has been developed. In this method, control of assist laser irradiation timing (delay time after an ablation laser irradiation) is very important for the quality of a HAp coating layer. We studied the influence of the timing on adhesion strength, crystallinity and Ca/P value of the HAp coating. Quality of the HAp coating layer obtained at a delay time of a few microseconds was extremely high. On the other hand, the layer obtained over 10 microseconds had more amorphous component and contained other calcium phosphate compounds from HAp. Using the present method, we succeeded in fabricating thin film (≦ 1 μm) of HAp with high crystallinity.
  • Comparison of the acid resistance of root dentin after treatment with an MIR-FEL emitting at between λ = 9.0 μm and a = 9.7 μm, Manabu Heya, Hiroshi Horiike, Shu Sano, Hiroaki Kumasaki, Yuichi Hashishin, Kazuhisa Sunada, Kazushi Yoshikawa, Masayoshi Inoue, Progress in Biomedical Optics and Imaging - Proceedings of SPIE, 5687, 50, 58,   2005 07 21 , 10.1117/12.583011, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=21844476181&origin=inward
    Summary:Background and and Objective: The surface modification of root dentin by mid-infrared (MIR) pulsed-laser irradiation is a potential candidate for non-invasive treatment to prevent root surface caries. The purpose of this study is to compare the relative acid resistance of root dentin treated with an MIR Free Electron Laser emitting at between λ = 9.0 μn and 9.7 μm. Study Design/Materials and Methods: The average power density was varied over the range 7.5-51.5 W/cm2. After irradiation, the samples were immersed in a 0.1 M lactic acid solution. Acid resistance was estimated as the quantity of Ca dissolved in the solution after immersion times (τim) of 1-22 h. Results: The acid resistance of all samples increased markedly, but only until τim= ∼3 h. It did not depend significantly on the laser parameters used. Conclusion: The surface modification of root dentin leads to improved acid resistance, but this only persists for a few hours and therefore represents a poor treatment for root surface caries.
  • Urtra fast laser activated photodynamic therapy for neovascularization, Kunio Awazu, Sachiko Suzuki, Miki Sawa, Masato Oji, Yasuo Tano, Yumiko Iwamoto, Yuichi Hashishin, Japanese Pharmacology and Therapeutics, 32,   2004 12 01 , https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=21144447152&origin=inward
    Summary:ICG has been widely used as a sensitive tracer of hepatic function. As a novel application of ICG, we estimated it as a photosensitizer for Photodynamic Therapy (PDT). In this research, ICG in tissues was excited by ultra short pulsed laser, femto second laser, for ICG-PDT. The ICG-PDT of age-related macular degenerations by the corneal neovascularization (in vivo) was examined using albino rabbits. As results, The femto second laser having 800 nm wavelength at 40J/cm2did not give the thermal damage to a normal tissue without ICG because of the thermal confinement interaction. Laser exposure 30 seconds after ICG injection was effective for occlusion of new vessels. Therefore, ICG can be used as a photosensitizer with less photosensitivity in visible region.
  • Wavelength and Average Power Density Dependency of the Surface Modification of Root Dentin Using an MIR-FEL, Shu Sano, Yuichi Hashishin, Manabu Heya, Yuko Fukami, Kunio Awazu, Nobuhiko Takagi, IEEJ Transactions on Electronics, Information and Systems, 124, 1234, 1243,   2004 01 01 , 10.1541/ieejeiss.124.1234, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85024745195&origin=inward
    Summary:Surface modification of root dentin by mid-infrared (MIR) pulsed-laser irradiation is one of the candidates for a novel, non-invasive treatment to prevent root surface caries. To modify root dentin effectively and non-invasively it is essential to estimate quantitatively and qualitatively the laser parameters, such as the wavelength and the power density, required for surface modification. The key aspect is to bring about effective surface modification of root dentin while minimizing the unwanted removal of the underlying dentin. Using a tunable, MIR Free Electron Laser (FEL) in the wavelength region of 8.8-10.6 µm, we have investigated macroscopically the extent of surface modification (morphological and chemical changes) of root dentin. We have obtained experimental results related to the ablation depth, the MIR absorption spectrum, and the elemental chemical composition of the irradiated dentin. The observations showed that the surface modification of root dentin was inclined toward well-recrystallized, HAp-like material, leading to an increase in the acid resistance and dentinal tubule sealing. The laser parameters, at which efficient surface modification without enhanced ablation occurred, were estimated to be at ʎ= ~9.0 µm or ~9.7 µm and in the average power density region of ~10-20 W/cm2(resulting in energy density per macropulse and peak power density regions of ~1-2 J/cm2and ~66.7-133.3 kW/cm2). Thus, it was found that the surface modification of root dentin strongly depends on the laser conditions applied. We conclude that the optimum laser wavelengths for (1) root surface caries treatment without restorative procedure and (2) hard tissue ablation without water irrigation are around (1) ʎ = 9.0 µm or 9.7 µm and (2) ʎ = 9.0 µm in the absorption bands due to P-0 stretching, respectively. © 2004, The Institute of Electrical Engineers of Japan. All rights reserved.
  • Real-Time Monitoring of the Surface Modification of Root Dentin using Photoacoustic Spectroscopy and Photothermal Radiometry, Manabu Heya, Hiroyuki Nagata, Shu Sano, Takeshi Uchizono, Yuichi Hashishin, Kunio Awazu, Proceedings of SPIE - The International Society for Optical Engineering, 4950, 98, 105,   2003 09 29 , 10.1117/12.476492, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0141605907&origin=inward
    Summary:For non-invasive laser dental treatment, a real-time and non-contact monitoring technique is needed. We have investigated the extent of the surface modification of root dentin using photoacoustic spectroscopy (PAS) and pulsed-photothermal radiometry (PPTR), and have discussed the applicability of each technology to in vivo monitoring during laser treatment. Root dentins were used as specimens. The wavelength, average power density, and exposure time used were varied within the ranges λ = 9.0-10.6 μm, Pav= 7-28 W/cm2, and τ = 0-10 s, respectively. The temporal behaviors of the laser-induced acoustic waves and the temperature rise were measured with an audible microphone and a radiation thermometer, respectively. The extent of the surface modification was evaluated by using information on the ablation depth and the absorption spectrum of the irradiated dentin. The morphological and chemical changes of the irradiated dentin can be made available to assist in dentinal tubule sealing and increased acid resistance for root surface caries therapy. It was found that time-resolved measurements of the acoustic waves and the temperature are useful for a real-time understanding of the extent of the morphological and chemical changes, respectively. We have demonstrated the applicability of an in vivo monitoring technique using PAS and PPTR for root surface caries therapy.
  • Hollow light guide and optical fiber for UV laser transmission, Uichi Kubo, Yuichi Hashishin, Hitoshi Nakano, Hiroyuki Tanaka, Proceedings of SPIE - The International Society for Optical Engineering, 3199, 75, 80,   1997 12 01 , 10.1117/12.301106, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0031289767&origin=inward
    Summary:The applications of ultraviolet lasers in medicine and surgery are expected to produce new therapies since UV laser is strongly absorbed by lipids, proteins and nucleic acids. The suitable tools for the UV laser power delivery, however, have not been developed yet. In an effort to make efficient delivery of UV laser, we have proposed hollow light guide which consists of an aluminum-phosphor bronze reflector and a teflon E-type rail spacer. The delivery characteristics of the hollow light guide have been investigated using the ArF and KrF excimer lasers. In case of the KrF laser, the transmittance and delivery energy reached 77%/m and 110mJ/pulse, respectively. In the ArF laser, the transmittance and delivery energy were obtained to be 56%/m and 40mJ/pulse, respectively. It is known that 193nm radiation by the ArF laser are absorbed by the air. Thus, the ArF laser beam delivery were examined in the helium gas. The transmittance and the delivery energy were obtained to be 72%/m and 50mJ/pulse using helium-filled hollow light guide, which were greatly improved for comparison with the case of the air. We have also tried the quartz fiber with OH ion doped core. The effects of a lightly doped core with Cl and a clad with B - F on the laser transmittance have been investigated. In these result, the Cl was not good core dopant. The B and F were useful clad dopants for the excimer laser transmission.
  • UV laser-biotissue interactions and delivery systems, Yuichi Hashishin, Hitoshi Nakano, Hiroyuki Tanaka, Uichi Kubo, SPIE Fiber Delivery Systems, 2977, 105, 114,   1997 12 01 , 10.1117/12.271013, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0345385997&origin=inward
    Summary:The interactions of UV laser beams and biotissues have been studied. The cutting quality of an ArF laser was the best sharp for hard biotissues (e.g. a bone, a tooth). From the current experiments, we found that the KrF laser beam has the highest incision ability for biological lipid of excimer lasers. For example, suet was cut off sharply by the KrF laser beam. On the other hand, the ArF laser incision has no thermal damage on suet even for the high repetition rate and the high energy fluence. However the conventional optical quartz fiber can not be available for an excimer laser beam (far-UV). So we have been investigating about UV laser power beam delivery systems. In the case of the hollow light guide with the aluminum-phosphor bronze reflector, we have obtained 56 and 75%/m transmittance of the ArF and KrF laser in straight state, respectively. Its delivery energy was 45 and 110 mJ/pulse of the ArF and KrF laser, respectively. The ArF laser transmittance has been tried in various atmosphere such as air, nitrogen, oxygen and helium. Finally, the medium of the laser delivery of the hollow light guide had better use the helium gas instead of the air. And the ArF laser transmittance and delivery energy were obtained 71%/m and 50 mJ/pulse, respectively. We have also tried the quartz fiber with OH ion doped core. The effects of a lightly doped clad with B and F on the transmittance have been investigated. In the one pulse operation, the ArF laser transmittance of B and F doped clad fiber was obtained 82%/m, which was better than that of only F doped clad fiber. The hollow light guide is suitable for the delivery system of UV laser scalpels, and the UV fiber is the useful delivery system of UV laser endoscopes. ©2004 Copyright SPIE - The International Society for Optical Engineering.
  • Excimer laser beam delivery systems for medical applications, Uichi Kubo, Yuichi Hashishin, Kazuyuki Okada, Hiroyuki Tanaka, Proceedings of SPIE - The International Society for Optical Engineering, 1893, 170, 176,   1993 01 01 , https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0027150808&origin=inward
    Summary:We have been doing the basic experiments of UV laser beams and biotissue interaction with both KrF and XeCl lasers. However, the conventional optical fiber can not be available for power UV beams. So we have been investigating about UV power beam delivery systems. These experiments carry on with the same elements doped quartz fibers and the hollow tube. The doped elements are OH ion, chlorine and fluorine. In our latest work, we have tried ArF excimer laser and biotissue interactions, and the beam delivery experiments. From our experimental results, we found that the ArF laser beam has high incision ability for hard biotissue. For example, in the case of the cow's bone incision, the incision depth by ArF laser was ca.15 times of KrF laser. Therefore, ArF laser would be expected to harden biotissue therapy as non-thermal method. However, its beam delivery is difficult to work in this time. We will develop ArF laser beam delivery systems.
  • Infrared delivery systems for Er:YAG laser, Uichi Kubo, Yuichi Hashishin, Hiroyuki Tanaka, Takayasu Mochizuki, Proceedings of SPIE - The International Society for Optical Engineering, 1591, 141, 145,   1992 01 01 , https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0026685526&origin=inward
    Summary:Er:YAG laser beams (2.94 μm) have more strong absorbability by water than CO2 laser beams (10.6 μm). Er:Yag lasers are expected as a treatment beam for water rich biotissue, we considered the application of Er:YAG lasers for medical use in the near future. When applying it for medical use, the delivery systems must be prepared. So we are investigating higher pulse power Er:YAG laser beam transmission with fluoride glass fibers, chalcogenide glass fibers, and hollow tube guides. From our experimental results, these beam delivery techniques are possible for Er:YAG lasers.
  • Laser deposition of CdS/Y-Ba-Cu-O heterostructures, L. Shi, Y. Hashishin, S. Y. Dong, J. P. Zheng, H. S. Kwok, Applied Physics Letter, 59, 11, 1377, 1379,   1991 12 01 , 10.1063/1.105314, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=36449003696&origin=inward
    Summary:Pulsed laser deposition was used to grow high-quality Y-Ba-Cu-O (YBCO) and CdS thin films sequentially on MgO. A temperature window between 200 and 250°C was found to be suitable for the deposition of CdS on YBCO. The transition temperature of the heterostructure was measured to be 72 K while the single YBCO film had a Tcof 85 K. The degradation was determined to be due to interface reaction, rather than the result of poor deposition conditions. X-ray measurements indicated that the CdS film was hexagonal and c-axis oriented. In situ resistivity measurement was used to monitor the film growth dynamics.
  • Hollow-tube-guide for UV-power laser beams, Uichi Kubo, Kazuyuki Okada, Yuichi Hashishin, Proceedings of SPIE - The International Society for Optical Engineering, 1420, 102, 107,   1991 01 01 , https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0025839881&origin=inward
    Summary:The use of ultraviolet lasers in medicine is expected to produce new surgical treatments. Basic experiments of the laser surgery with both KrF and XeCl excimer lasers have been completed. As is well known, visible and infrared beams are able to use ordinary quartz fiber. However, the optical fiber cannot be of use of power UV beam with excimer lasers. Some techniques about UV beams are needed. One of the techniques is the hollow tube with compound metal and polymer. This paper reports on the experimental results. The authors tried to transmit KrF and XeCl excimer laser beams by hollow tube guide. The hollow tube length is 1 meter. The delivery average power was 1.4W(KrF) and 3.8W(XeCl), the delivery energy was 7.0mJ/pulse(KrF) and 38mJ/pulse(XeCl), the peak power was 300kW(KrF) and 2.5MW(XeCl), the transmittance was 35%(KrF) and 49%(XeCl). The emitted beams are focused to ca.0.5mm diameter spot. Maximum peak power density and one pulse energy density of focused beam reached 700W/cm2(KrF), 1.9kW/cm2(XeCl) and 3.5J/pulse cm2(KrF), 19J/pulse cm2(XeCl). From the results, the hollow tube is possible as a UV power beams delivery system.
  • Hollow tube guide for higher power pulse CO2 laser, Uichi Kubo, Yuichi Hashishin, Proceedings of SPIE - The International Society for Optical Engineering, 1228, 198, 203,   1990 12 01 , https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0025662767&origin=inward
    Summary:We considered the medical applications of higher power pulse CO2 laser. We have investigated IR beam guide by hollow tube for CO2 laser. The hollow tube with metal and polymer is effectively a system for CW CO2 higher power laser beam transmission. We have tried to transmit the high peak power pulse CO2 laser beam with hollow tube guide. Using the CO2 laser we have high peak power (22MW max.), short pulse duration (80ns) and repeat pulse (under 10pps). In this experiment, the laser beam transmittance was obtained ca.90% per meter in straight state hollow tube. The delivery peak power was 1.5MW, energy per pulse was 120mJ and average power was 1.2W.
  • Uv-beam guide for medical excimer lasers, U. Kubo, Y. Hashishin, K. Okada, Proceedings of SPIE - The International Society for Optical Engineering, 1067, 204, 210,   1989 06 15 , 10.1117/12.952123, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0005394906&origin=inward
    Summary:As is well known visible and near infrared beams are able to use ordinary quartz fiber. There are needed some technique about ultraviolet beams. We have been investigating about that, one of the technique is to OH on added to high purity quartz fiber. So in our laboratory, we have obtained 85%/m 248nm beam transmittance in over 200ppm 0 ion added quartz fiber at the milliwatt power regions. On the other hand, we have investigating 308nm beam delivery with the OH ion unadded high purity quartz fiber. The transmittance was over 85%/m, therefore the high purity quartz fiber is usable to XeC1 laser beam delivery systems, we have been investigating also UV-beam delivery with the metal-polymer compound he tube. © SPIE.
  • Optical beam guides for medical CO2 and excimer lasers, Uichi Kubo, Yuichi Hashishin, Kazuyuki Okada, Proceedings of SPIE - The International Society for Optical Engineering, 906, 214, 219,   1988 06 21 , 10.1117/12.945281, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0001538844&origin=inward
    Summary:The metal and polymer compound hollow tube is effective guide for cw CO2laser beam transmission. We have tride to high peak pulse CO2 laser beam delivery with the hollow tube guide. Using the CO2 pulse laser have high peak (46MW max., short pulse width (80ns) and repeat pulses(under lOpps). In this experiments, the laser beam transmittance was obtained ca.90%/m. So the hollow tube are confirmed as useful beam guide technique for also pulse CO2 laser. We are having also investigates of UV laser beam transmission with the hollow tube as CO2 laser beam. We have used KrF excimer laser(248nm wavelength). We found that the random polarized beam transmittance was ca.26%/m, if polarized beam was ca.37%/m, delivery average power and energy were ca.1 watt(220kW peak power) and 5mJ per pulse respectively. On the other hand, we have been developing UV optical fiber for KrF laser, Results so far were obtained above 80%/m transmittance by OH ion added quartz glass fiber. © 1988 SPIE.
  • HOLLOW LIGHT GUIDE TUBE FOR CO//2 LASER BEAM., Uichi Kubo, Yuichi Hashishin, Proceedings of SPIE - The International Society for Optical Engineering, 713, 17, 21,   1987 12 01 , https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0023570874&origin=inward
    Summary:The suitable laser power light guide system is necessary in the medical laser apparatus. In order that the function must be effective, enough flexibility and safety of power laser guide are required. We have developed a non-toxic flexible CO//2 laser beam guide with metal and polymer hollow tube. The present experimental results show that the CO//2 laser beam transmission rate is about 85% per meter, emitted power was obtained about 81W at 1 meter guide length and any accidents did not happen under the continuous transmission. The emitted light beam spot was focused to about 0. 5mm diameter. We have obtained emission beam power density of 40kW/cm**2. The amounts of this power density will be practical for medical applications. The guide tube has flexibility, the tube is bent easily to a round shape at radius above 10cm. The twist of tube is also possible. On the other hand, in order to improve flexibility, we have a trial product of narrow tube. The hollow guide tube will anticipate development of new medical applications of CO//2 laser.
  • CO2レーザー中空導光路の改善, 橋新 裕一, 久保 宇市, 日本レーザー医学会誌, 7, 3, 161, 162,   1987 01 , 10.2530/jslsm1980.7.3_161
  • 可撓中空導光路の80W級CO2レーザー出力伝送, 久保 宇市, 橋新 裕一, 日本レーザー医学会誌, 6, 3, 359, 362,   1986 01 , 10.2530/jslsm1980.6.3_359
  • 中空金属形CO2レーザー導光路, 橋新 裕一, 久保 宇市, 日本レーザー医学会誌, 5, 3, 273, 278,   1985 01
  • Flexible hollow metal light guide for medical co2 laser, Uichi Kubo, Yuichi Hashishin, Proceedings of SPIE - The International Society for Optical Engineering, 494, 79, 83,   1984 10 24 , 10.1117/12.943914, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0021662428&origin=inward
    Summary:In a medical CO2 laser system for clinical use, it is necessary to develop the new type laser beam guide. As this one technique, a light guide by metal-polymer hollow tube was developed with aluminum foil and polymer. An aluminum foil and thin polymer were used as light beam reflector and the spacer between aluminum foils. The laser beam is propagated in a space bounded with the aluminum foils and polymer spacers. Namely, beam propagation medium is the air, therefore, this guide tube is non-toxic for CO2 laser beam propagation. The present experimental results show that the CO2 laser beam transmission rate exceeds 80% per meter, emitted power was obtained about 25W at 1m guide length and any accidents were not happen under condition that the continuous transmission in an hour. © 1984 SPIE.
  • 中空金属形CO2レーザー導光路, 橋新 裕一, 日本レーザー医学会誌, 5, 2, 63, 63,   1984 10
  • 赤外レーザー用導光路の開発, 久保宇市, 橋新裕一, 日本レーザー医学会誌, 1, 1, 185, 191,   1980 11

Awards & Honors

  •   2013 , IEC1906