The Review of Laser Engineering

[title in Japanese]

Toshinori TAKAGI

1992 Volume 20 Issue 7 Pages 455-456
Published: July 29, 1992
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.20.7_455

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[title in Japanese]

Hiroshi TAKUMA

1992 Volume 20 Issue 7 Pages 457-460
Published: July 29, 1992
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.20.7_457

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Present Status of Photodynamic Therapy for Cancer of Upper Gastrointestinal Tract

Seishiro MIMURA, Shigeru OKUDA

1992 Volume 20 Issue 7 Pages 461-474
Published: July 29, 1992
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.20.7_461

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Between 1981 and 1990, we treated 7 superficial esophageal cancer (SEC) and 44 early gas-tric cancer (EGC) lesions (41 cases) by photodynamic therapy (PDT) with an argon dye laser (ADL). The procedure was as follows: 3 mg/kg of HpD (Photofrin I) or 2 mg/kg of PHE (Photofrin II) was intravenously injected. Then about 50 hours later, the entire lesion plus a5 mm width of marginal mucosa was irradiated with an ADL at 630 nm wavelength transmitted endoscopically. The irradiation was delivered at 300 mW·5minutes/cm² for a total dose of 90 J/cm². Thus PDT was proved to be effective for the depressed type of EGC, especially for the type with ulceration. However, according to the depth of cancer invasion in 7 SEC and in 44 EGC, the rate of cure of submucosal carcinomas was only 33% (1/3) and 55% (11/20), while that of mucosal carcinomas was 100% (4/4) and 88% (21/24) in SEC and EGC, respectively. In 1990, therefore, we investigated an excimer dye laser (EDL) from Hamamatsu Photonics as the excitation light source for PDT. The irradiation with the EDL was delivered at 4 mJ per pulse with peak power of 400 kW and 40 pps at 630 nm wavelength for a total dose of more than 60 J/cm². In this study, four cases of SEC, which consisted of 2 mucosal and 2 submucosal, and fifteen cases of EGC, which consisted of 11 mucosal and 4 submucosal, were treated by PDT with EDL, and local cure was obtained in all cases.

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Development of a Power-Modulated TEA CO₂ Laser System with Long Pulse Duration

Koichi SASAKI, Takashige TSUKISHIMA

1992 Volume 20 Issue 7 Pages 475-487
Published: July 29, 1992
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.20.7_475

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After a brief historical review on injection locking of TEA CO₂ lasers, it is shown that the in-jection locking scheme with a pulsed injection source is a useful method to obtain monochromatic or power-modulated high-power outputs with long pulse durations (-μs). Details of the newly developed laser system are presented together with experimental results and computer simulations. Various feedback loops are incorporated in the laser system to assure reliable operation. Some applications of the laser outputs so obtained are also mentioned.

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DIAL Measurements of Water Vapor with a Ti: Sapphire Laser

Chikao NAGASAWA, Makoto ABO, Youichi HATA

1992 Volume 20 Issue 7 Pages 488-494
Published: July 29, 1992
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.20.7_488

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A differential absorption lidar (DIAL) system based on a continuously tunable Ti : sapphire laser is described. The system is capable of range-resolved measurement of atmospheric water vapor with 720nm absorption lines. A simple and compact laser wavelength tuning system for the water-vapor 720nm absorption lines is presented. The tuning system makes use of a com-pact wavemeter calibrated by the neon resonance line (724.5167nm) of a hollowcathode lamp. An actual measurement of water vapor in the lower troposphere is achieved by using this DIAL system.

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Phase-Change Optical Disk Media for Two-Wavelength Recording and Reading

Masami MIYAGI, Hiroki YAMAZAKI, Reiichi CHIBA, Iwao HATAKEYAMA

1992 Volume 20 Issue 7 Pages 495-501
Published: July 29, 1992
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.20.7_495

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Phase change optical disk media for 830nm wavelength recording and 670nm wavelength read-ing have been developed. These media are designed by optical calculation and suitable media structures have been clarified for three types of recording film thickness (26, 40 and 80nm). The optical disks are made according to the optical design and the disk characteristics are evaluated. They have high reflectivity contrasts at the two wavelengths and a high optical absorption at 830nm. The reflectivity contrast and their margin for the undercoat and the over-coat thickness fluctuation have the maximum value at a recording film thickness of 80nm. They accomplish 1.2 times higher linear recording density than that of conventional optical disks. The erasability and overwriting repeatability of the disks are comparable to that ofconventional phase change optical disks.

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Nonlinear Spectroscopic Ellipsometry of Isotropic Media

Igor I. GANCHERYONOK

1992 Volume 20 Issue 7 Pages 502-513
Published: July 29, 1992
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.20.7_502

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We are developing a novel method of nonlinear polarization spectroscopy which we term NSE (Nonlinear Spectroscopic Ellipsometry). NSE deals with investigations of the polarization be-havior of a probe beam passing through an isotropic medium in the presence of a strong pumping field. The probe wave polarization parameters are derived in the case of arbitrary polarized in-teracting waves in the framework of the 3rd-order nonlinear susceptibility (3NS). A new method of measuring the phase of the 3NS that is based on the use of circularly polarized probe and linearly polarized pump beams is proposed. The feasibilities of separate measurements of the dis-persion of the real and imaginary parts of the 3NS by the NSE methods are demonstrated. The re-sults of the theoretical consideration are applied to estimate the magnitude of the 3NS of some dye solutions and gaseous media under different conditions of excitation.

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CLEO/QELS '92 REPORT I

-Solid State Lasers, Nonlinear Wavelength Conversion, Ultrashort Pulse Generation-

Kei OHTA, Tadashi KANABE, Takatomo SASAKI, Michio OKA, Yoshimasa WATAN ...

1992 Volume 20 Issue 7 Pages 514-549
Published: July 29, 1992
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.20.7_514

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CLEO/QELS '92 REPORT II

-Semiconductor Lasers, Optical Communications, Nonlinear Optics-

Kenichi IGA, Kazuhisa UOMI, Masataka NAKAZAWA, Masaki ASOBE, Hidehiko ...

1992 Volume 20 Issue 7 Pages 550-571
Published: July 29, 1992
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.20.7_550

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CLEO/QELS '92 REPORT III

-Gas Lasers, X-ray Lasers, Laser Fusion, Laser Spectroscopy-

Masayuki KAKEHATA, Hideo HIROSE, Masanobu YAMANAKA, Takahisa JITSUNO, ...

1992 Volume 20 Issue 7 Pages 572-587
Published: July 29, 1992
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.20.7_572

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CLEO/ELS '92 REPOT IV

Laser Processings, Medical and Biological Applications

Masataka MURAHARA, Hiroshi KUMAGAI, Tunenori ARAI

1992 Volume 20 Issue 7 Pages 588-597
Published: July 29, 1992
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.20.7_588

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[title in Japanese]

1992 Volume 20 Issue 7 Pages i
Published: July 29, 1992
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.20.7_i

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