The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 10, Issue 4
Displaying 1-11 of 11 articles from this issue
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  • [title in Japanese]
    Tatsuzo OBAYASHI
    1982 Volume 10 Issue 4 Pages 363-364
    Published: July 30, 1982
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.10.363
    JOURNAL FREE ACCESS
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  • Development of High Power Pulsed CO2 Laser
    Sadao NAKAI, Masafumi MATOBA, Hisanori FUJITA, Hiroyuki DAIDO, Mitsuo ...
    1982 Volume 10 Issue 4 Pages 365-377
    Published: July 30, 1982
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.10.365
    JOURNAL FREE ACCESS
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  • Polarization Properties of the Photon Echo in Solids
    Toshiro KOHMOTO, Masaaki NIDO, Yukio FUKUDA, Masahiro MATSUOKA
    1982 Volume 10 Issue 4 Pages 378-384
    Published: July 30, 1982
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.10.378
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    The behavior of the photon-echo polarization in solids is discussed. The photon echo in La F3: Pr3+ is considered in some details as a typical example. The echo is induced by linearly polarized pulses propagating along the c axis of the crystal, with an angle between their electric vectors. The polarization direction and the intensity of the echo in the case of small-area exciting pulses are calculated both for the twopulse echo and the three-pulse echo. An experiment on La F3: Pr3+ is also performed and the result is well interpreted by the calculation.
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  • Development of High-Power CO2 Laser LEKKO VIII
    Control System with Optical-Fiber-Linked CPU
    Kiyohisa TERAI, Hisanori FUJITA, Masafumi MATOBA, Sadao NAKAI, Chiyoe ...
    1982 Volume 10 Issue 4 Pages 385-393
    Published: July 30, 1982
    Released on J-STAGE: July 30, 2010
    DOIhttps://doi.org/10.2184/lsj.10.385
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    The LEKKO VIII eight-beam 10kJ CO2laser system, has been completed. One of the new developments of this system is the full CPU-aided control system with optical fiber links. The master controller and CPU in a electrical shield room is connected to sub-controllers only by optical fibers to avoid the electrical noise inducedby the high-current and high-voltage discharge with a rapid rise-rate.
    The regular operation of the laser system can be performed with one man speedily. All the data on system operation such as the fire timing, the discharge current waveform and oscillation lines are collected, computed and stored in CPU memory. Steady and reliable operation of the system has been achieved.
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  • Formation of Rotationally Highly Excited NH (A3 IIi) Radical by VUV Laser at 193nm and Its Reactive Quenching by Foreign Gases
    Nobuyuki NISHI, Hisanori SHINOHARA, Ichiro HANAZAKI
    1982 Volume 10 Issue 4 Pages 394-399
    Published: July 30, 1982
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.10.394
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    NH (A3 IIi) radical has deen produced selectively in the 193 nm laser photolysis of methylamine. Analysis of the rotational population shows non-Boltzmann distribution with its maximum around the levels of N′ = 10. No obvious spin polarization has been observed. The intensity of the (1, 1) vibrational band indicates a low vibrational temperature of this radical.
    A Stern-Volmer plot of 1/τ(τ; fluorescence life time) versus methylamine p ressure. gives a radiative life time of 545±65 ns for NH (A3 IIi). The slope yields a quenching rate constant of (5.5±0.15) ×10-10cm3·molecule-1. s-1. The quenching constants of NH (A3 IIi) with CO, CH4 C2H4 and CH3OH are very large corresponding to the hard sphere collision rates estimated from the classical theory. It is concluded that the main quenching process is not the spin state conversion of the A3IIi, to a lower singlet state in contrast to the case of NH (c1II) but the formation of reactive intermediates with those gases.
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  • Measurements of Excitation of the O2(a1Δg) State for Excitation of Atomic Iodine Laser by Low Energy Electrons
    Chobei YAMABE, A.V. PHELPS
    1982 Volume 10 Issue 4 Pages 400-410
    Published: July 30, 1982
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.10.400
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    The excitation coefficients of the O2 (a1Δg) state by low energy electrons in O2-Ar, O2-N2-Ar, O2-N2 mixtures and pure O2 have been measured using a drift tube technique.The time dependence of the absolute intensity of the 1.27μm band emission was measured for 0.05% O2 in Ar, for (1-5)% O2 in N2-Ar, for 20% O2 in N2 at total gas density of (2.3-16)×1018cm-3 and for pure O2 at total gas density of (0.97-6.44)×1017cm-3. The electric field to gas density ratio E/N was varied from (0.5-5)×10-17 V-cm2 for O2-Ar mixtures, from (0.2-3)×10-16 V-cm2 for O2-N2-Ar, O2-N2 mixtures and from (0.8-7)×10-16 V-cm2 for pure O2. The measured decay constants yield a normalized diffusion coefficient for O2 (a1Δg) in Ar of DN≈1.65×1018 cm-1 sec-1 and rate coefficients for quenching by O2 and Ar of 1.51×10-18 cm3 sec-1 and 1.86×10-20cm3 sec-1 respectively. Our experimental electron excitation coefficients agree satisfactorily with values calculated using derived sets of electron collision cross sections for O2, N2 and Ar.
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  • Optical-path Noise in Diode-Laser Gas Monitoring
    Hiroya SANO, Ryuji KOGA, Megumi KOSAKA
    1982 Volume 10 Issue 4 Pages 411-418
    Published: July 30, 1982
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.10.411
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    The performance of an atmospheric gas monitoring system that is local, real-time, non-contacting and portable was examined. An experimental system was built using Pb Sn Te lead-salt infrared diode laser and Hg Cd Te infrared detectors operating in 7.6μm band. Atmospheric absorption spectra over 1 cm-1 instead of absorption at, a singleline, was involved to obtain the gas density. Experiments were performed for methaneand the sensitivity was found to be 0.3 ppm for one meter optical-path and for 4 secondsof single spectral scanning period. This value was mostly limited by etalon fringes (optical-path noise). Methods to suppress the fringe are proposed. Its statisticalfeatureswere investigated and the shortest measurement time without sacrificing theaccuracy is anticipated to be as short as that of responses of the current devices 4.7ms.
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  • High-Power UV-Visible-IR Continuously Tunable Picosecond Laser Using Optical Parametric Oscillator
    Yoshihiro TAKAGI, Minoru SUMITANI, Nobuaki NAKASHIMA, Keitaro YOSHIHAR ...
    1982 Volume 10 Issue 4 Pages 419-426
    Published: July 30, 1982
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.10.419
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  • Oscillator-Amplifier System in TE·N2 Laser Using the Pressure-Dependent Formative Time-Lag
    Kiichiro KAGAWA, Masanobu TANI, Masahiro UEDA
    1982 Volume 10 Issue 4 Pages 427-432
    Published: July 30, 1982
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.10.427
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  • 1982, IEEE International Conference on Plasma Science
    Masahiro NAKATSUKA
    1982 Volume 10 Issue 4 Pages 433-438
    Published: July 30, 1982
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.10.433
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  • [title in Japanese]
    1982 Volume 10 Issue 4 Pages 439-444
    Published: July 30, 1982
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.10.439
    JOURNAL FREE ACCESS
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