The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 21, Issue 7
Displaying 1-11 of 11 articles from this issue
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  • [title in Japanese]
    Yasutomo FUJIMORI
    1993 Volume 21 Issue 7 Pages 715
    Published: July 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.7_715
    JOURNAL FREE ACCESS
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  • Application of Laser Ablation to the Development of New-Type Reactions: Laser Ablation-Molecular Beam (LAMB) Method
    Hiroyasu SATO
    1993 Volume 21 Issue 7 Pages 716-723
    Published: July 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.7_716
    JOURNAL FREE ACCESS
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    In the laser ablation-molecular beam (LAMB) method developed by the present author's group, metal ions (M+) laser-ablated from a metal surface react with molecules or clusters (organic, thorganic, organometallic, or mixed) in a molecular beam injected nearby. A variety of novel product ions are detected by mass spectroscopy . The intrinsic property of each metal atom is clearly manifested, apart from any effect of solvent, ligand, or substituent. For Cr (CO)6, mixed-metal carbonyls, MCr(CO)n+ (n=0.6), are observed. For benzene clusters, clustered complex ions M(C6H6)n+ or fragment complex ions M(C6H6)(CxHy)n+, x≤6 and y≤4, are obtained. Their structures are very intriguing. For ammonia or methanol clusters, the observed intensity gaps indicate the favorable coordination number of each M+ in the gas phase. The LAMB method, albeit very simple, is a very versatile method. We can envisage a wide scope ranging from physical, organometallic, and catalytic chemistry to astrophysics.
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  • Compositional Analysis of Composite Materials with Soft-X-Rays from Laser Produced Plasma
    Hirozumi AZUMA, Akihiro TAKEICHI, Ichiro KONOMI, Shoji NODA
    1993 Volume 21 Issue 7 Pages 724-729
    Published: July 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.7_724
    JOURNAL FREE ACCESS
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    By using single shot soft X-rays from laser produced plasma, the characteristic response curve of a Q-plate (a soft-X-ray photo-graphic plate) and the transmission spectra of composite materials were measured. The dynamic range of the Q-plate for soft-X-rays was evaluated to be 2×102. The compositions of the composite materials were also determined by comparing observed transmittances with calculated ones.
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  • Analysis of a DFB Laser with Nonuniform Structure
    Norifumi OTSUKA, Norikatsu YAMAUCHI
    1993 Volume 21 Issue 7 Pages 730-737
    Published: July 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.7_730
    JOURNAL FREE ACCESS
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    We present analytical results, based on a wavetheoretical approach, on the lasing characteristics of a distributed feedback (DFB) laser with nonuniform structure, which the grating period gradually varies (called “chirped grating”). Numerical examples show that the symmetrical chirping profile is superior to the antisymmetrical one from the view of single mode lasing and also predict that the chirped DFB can suppress spatial hole burning at high power operations.
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  • Turbidity Measurement with a Fiber-Optic Refractive-Index Sensor
    Takashi TAKEO, Hajime HATTORI
    1993 Volume 21 Issue 7 Pages 738-745
    Published: July 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.7_738
    JOURNAL FREE ACCESS
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    Turbidity measurement using a U-shaped fiber-optic refractometer and an optical time domain reflectometer (OTDR) has been investigated. Refractive index sensors placed serially along a single fiber transmission line from the OTDR detect light backscattered by particles suspended in the medium surrounding the sensor. When the medium is turbid, a spike signal is generated in the OTDR waveform due to the backscattered light. The amplitude of this spike was measured for various sample turbidities and was found to be proportional to the degree of turbidity of the medium. These results indicate that this particular method can be used to measure the turbidity of solutions. This method can also be employed to obtain information on the refractive index of the medium independent of its turbidity.
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  • FEL Oscillation by Coherent Radiation Emitted from an Electron Bunch
    Makoto ASAKAWA, Naoki SAKAMOTO, Naoki INOUE, Sinya ESAKI, Tatsuya YAMA ...
    1993 Volume 21 Issue 7 Pages 746-753
    Published: July 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.7_746
    JOURNAL FREE ACCESS
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    The free-electron-laser experiment in the milli-meter-range by the coherent radiation emitted from an electron bunch is reported. With a 7MeV rf-linac, the spontaneous emission of 20W has been observed. The oscillation experiment has been performed by superimposing this radiation in the resonator. Power of 16W was observed at wavelength of 2.73mm.
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  • Report on CLEO/QELS'93 I
    -Solid State Lasers and Nonlinear Wavelength Conversion-
    Masanobu YAMANAKA, Akira SUDA, Masato OHMI, Genji TOHMON, Masahiro ITH ...
    1993 Volume 21 Issue 7 Pages 754-771
    Published: July 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.7_754
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  • Report on CLEO/QELS'93 II
    -Gas Lasers, X-ray Lasers, Laser Fusion, and Ultrashort Pulses-
    Hitoshi SEKITA, Shunichi SATO, Koichi YAMAKAWA, Hitoshi KAWAGUCHI, Haj ...
    1993 Volume 21 Issue 7 Pages 772-791
    Published: July 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.7_772
    JOURNAL FREE ACCESS
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  • Report on CLEO/QELS'93 III
    -Semiconductor Lasers, Optical Communications, and Optical Devices-
    Yawara KANEKO, Tomoyuki MIYAMOTO, Kenichi IGA, Misuzu SAGAWA, Hiromu T ...
    1993 Volume 21 Issue 7 Pages 792-807
    Published: July 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.7_792
    JOURNAL FREE ACCESS
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  • Report on CLEO/QELS'93 IV
    -Environmental Research, Laser Diagnostics, Processing, and Optical Imaging-
    Shigeaki UCHIDA, Tatsuo OKADA, Tadashi KOYAMA, Yoshio CHO
    1993 Volume 21 Issue 7 Pages 808-817
    Published: July 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.7_808
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1993 Volume 21 Issue 7 Pages i
    Published: July 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.7_i
    JOURNAL FREE ACCESS
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