The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 19, Issue 6
Displaying 1-8 of 8 articles from this issue
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  • [title in Japanese]
    Keiichi YAMAMOTO
    1991 Volume 19 Issue 6 Pages 507
    Published: June 29, 1991
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.19.6_507
    JOURNAL FREE ACCESS
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  • Population Inversion in a Stationary Recombining Plasma
    Kuninori SATO, Chan JOSHI
    1991 Volume 19 Issue 6 Pages 508-519
    Published: June 29, 1991
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.19.6_508
    JOURNAL FREE ACCESS
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    Population inversion, which occurs in a recombining plasma when a stationary plasma is brought into contact with a neutral gas, is surveyed. The mechanism of the population inversion in a recombining plasma is discussed with an emphasis on atomic processes.
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  • Toward Microphotoconversion
    Noboru KITAMURA, Hiroshi MASUHARA
    1991 Volume 19 Issue 6 Pages 520-527
    Published: June 29, 1991
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.19.6_520
    JOURNAL FREE ACCESS
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    Chemical and physical processes characteristic to μm-order dimensions are demonstrated. Asμm-size effects, the photoresponse time of dilation of microgels and the efficiency of pyrene excimer formation in liquid droplets dispersed in water are shown to decrease with reducing their size to μm. Fabrication of a series of μm-order reaction sites is an another important topic to be pursued. Photochemical surface modification, laser ablation, and chemical vapor deposition techniques were successfully employed to prepare pm photochemical functional sites on materials surface.
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  • Laser Triggered Lightning
    Etsuo FUJIWARA, Yasukazu IZAWA, Zen-ichiro KAWASAKI, Kenji MATSURA, Ch ...
    1991 Volume 19 Issue 6 Pages 528-537
    Published: June 29, 1991
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.19.6_528
    JOURNAL FREE ACCESS
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    Electrical discharge guided by a 100J/2GW pulse CO2 laser is reviewed. A long air break-down plasma channel is produced by using a Multi-Active CHannel (MACH) focusing mirror which has two focal lengthes. The plasma channel has been used to guide electrical discharge over a distance of 6m in laboratory air at an applied potential of-1.2MV. A successive plasma channel produced by the laser is more effective for discharge guiding than the chains of break plasma beads. A stepped leader was obserbed with a streak camera for laser guided discharge. The mean propagation velocity of the stepped leader was 105-106m/s.
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  • Optical Beam Tracking/Pointing Stability in Free-Space Laser Communication Systems
    Ken-ichi ARAKI, Yoji FURUHAMA
    1991 Volume 19 Issue 6 Pages 538-543
    Published: June 29, 1991
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.19.6_538
    JOURNAL FREE ACCESS
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    Laser communication between two spacecraft stations requires reciprocal spatial beam tracking/pointing. The tracking/pointing performance at one station depends not only on the spacecraft motion disturbance and the tracking system noise, but also on both the pointing errors and the beam pattern at the other transmitting station. The pointing errors of two cooperative beam tracking/pointing systems are analyzed. On some practical assumptions, conditions for stable beam tracking/pointing are derived to explicitly relate the key system parameters of two tracking/pointing systems. An application of the stable conditions to a laser crosslink design is also shown.
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  • Integrated Optic Flow Meter with Cantilever Structure on Silicon Substrate
    Masashi OHKAWA, Masayuki IZUTSU, Tadasi SUETA
    1991 Volume 19 Issue 6 Pages 544-550
    Published: June 29, 1991
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.19.6_544
    JOURNAL FREE ACCESS
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    An integrated optic flow meter with a cantilever structure is proposed and was built for the first time on a silicon substrate. The sensor with a narrow gap along the cantilever edge is sandwiched between tubes in which a fluid flows. The gap induces pressure difference between the front and back regions of the lever. Cantilever deformation due to the pressure difference is transformed into the intensity change of the lightwave by an integrated optic interferometer. We analyzed the operation and designed a flow meter. A device fabricated was examined for a nitrogen gas flow using a TM-like light mode at 633 nm. The output intensity measured monotonously decreased with increase in the flow from 0 to 600 cc/min at which the output light intensity was 30% of the maximum value at 0 cc/min.
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  • [title in Japanese]
    Kimihiro SHIBATA, Yasuhide YAMAGUCHI, Katsumi MIDORIKAWA
    1991 Volume 19 Issue 6 Pages 551-565
    Published: June 29, 1991
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.19.6_551
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1991 Volume 19 Issue 6 Pages plate1
    Published: June 29, 1991
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.19.6_plate1
    JOURNAL FREE ACCESS
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