The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 23, Issue 4
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    Shigeo MINAMI
    1995 Volume 23 Issue 4 Pages 255-256
    Published: April 28, 1995
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.23.255
    JOURNAL FREE ACCESS
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  • An Application of Excimer Laser for the Crosslinking of Polyethylene
    On the Effect of Irradiation Temperature and Crosslinking Agent
    Fujio SAKAN, Masahiro UEDA, Hideki TANAKA, Kimihiko YOSHIMURA
    1995 Volume 23 Issue 4 Pages 257-263
    Published: April 28, 1995
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.23.257
    JOURNAL FREE ACCESS
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    In order to obtain high crosslinking rate, polyethylene has been irradiated with an excimer laser. The effect of irradiation temperature and concentration of crosslinking agent, triallyl cyanurate (TAC) on the crosslinking rate has mainly been studied as well as that of laser wavelength and concentration of photoinitiator, 4-chlorobenzophenone (CBP).
    A KrF excimer laser light is employed at an irradiation dose of about 450 J/g (sample weight). The irradiation temperature is varied from room temperature to 170°C, and the concentrations of additives were changed from 0.01 to 1.0% (CBP) and 0.01 to 2.0% (TAC).
    The CBP concentration of 0.1% and the TAC concentration of 1.0% and the irradiation temperature 150-170°C, just above the melting point of polyetylene, are found to be the opti-mum condition for high crosslinking rate. Almost twice the overall gel content was observed as compared with the previous result.
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  • Characteristics of Debris Formation During Laser Abiation and a Practical Method for Removing the Debris
    Yasumitsu ORII, Isamu MIYAMOTO
    1995 Volume 23 Issue 4 Pages 264-272
    Published: April 28, 1995
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.23.264
    JOURNAL FREE ACCESS
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    The diameter of the debris deposited by KrF excimer laser ablation of polyimide has been measured as a function of gaspressure and laser fluence in different ambient gas species including He, N2, air, 02, and Kr. It was shown that the amount of the debris is decreased in ambient gases with low masses or at low pressures where generation of the blast wave can be suppressed. The relationship between the measured debris diameter and the shape of the luminous plume produced by ablation of polyimide was also investigated. A XeCl excimer laser was successfully implemented in thin film line deletions of a multichip carrier used in highperformance mainframe processors. The amount of the debris on a wire bond pad nearby laser deletion was quantified as an ultrasonic power for wire bonding. The helium gas purge condition was thus optimized to reduce the debris.
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  • Optical Multimode Time-Domain Reflectometry
    Yishu WANG, Tadayuki FUNABA, Tsutomu ICHIMURA, Naohiro TANNO
    1995 Volume 23 Issue 4 Pages 273-279
    Published: April 28, 1995
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.23.273
    JOURNAL FREE ACCESS
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    A novel type of optical time domain reflectometry (OTDR) using a multimode laser source is shown, for the first time to our knowledge, to be capable of ultrahigh resolution of the order of 10μm. The main advantage of this method can provide a possibility of high-sensitivity becaus of the coherence properties of the multimode laser. The principle of operation and the detection of a multilayer less than 150μm in thickness are demonstrated. The method shows promise for detecting reflected signals from an optical waveguide memory or other optical objects.
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  • Second Harmonic Generation of Short Pulse, High Peak-Power, Line-Narrowed TEA CO2 Laser Using a AgGaSe2 Crystal
    Akiko HARASAKI, Masakatsu SUGII, Yutaka UCHIDA, Shinji OHKUMA, Jun SAK ...
    1995 Volume 23 Issue 4 Pages 280-287
    Published: April 28, 1995
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.23.280
    JOURNAL FREE ACCESS
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    Second-harmonic generation (SHG) of short pulse, high peak-power, line-narrowed TEA CO2 laser radiation has been demonstrated for the typical vibrational-rotational transition lines of 10P, 10R, 9P and 9R branches in a 15-mm long AgGaSe2 crystal with broad band AR coatings. A high energy conversion efficiency of 38% with the SHG output energy of 7.4mJ (274 kW peak power) was achieved in triple-pass at a moderate pumping intensity of 5.7 MW/cm2. Multi-pass pumping scheme is a very powerful technique to enhance conversion efficiency.
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  • Tuning Range Improvement of a Rhodamine 6G Dye Laser by Addition of KOH to the Solution
    Masanori JYUMONJI, Haruo UCHIYAMA, Nobuo NAGAMINE
    1995 Volume 23 Issue 4 Pages 288-290
    Published: April 28, 1995
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.23.288
    JOURNAL FREE ACCESS
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    It is well known that the tuning range of 4MU dye laser can be widely improved to about 1700 Å by addition of HCl to the dye solution.
    In this paper, we report a similar technique for a Rhodamine 6G dye laser. We succeeded for the first time in widening a tuning range to about 450 Å and in obtaining flat tuning curve for a flashlamp-pumped Rhodamine 6G dye laser by addition of KOH to the dye solution.
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  • Report on Topical Meeting of Advanced Solid-State Lasers
    Michio OKA
    1995 Volume 23 Issue 4 Pages 291-296
    Published: April 28, 1995
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.23.291
    JOURNAL FREE ACCESS
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