The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 22, Issue 1
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    Jiro USHIO
    1994 Volume 22 Issue 1 Pages 1
    Published: January 29, 1994
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.22.1
    JOURNAL FREE ACCESS
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  • Particle Formation by CO2 Laser-Induced Breakdown (III) The Formation of Mo and MoS2 Fine Powders from Mo (CO)6
    Toshiyuki OYAMA, Tadahiro ISHII, Kazuo TAKEUCHI
    1994 Volume 22 Issue 1 Pages 2-8
    Published: January 29, 1994
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.22.2
    JOURNAL FREE ACCESS
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    Fine powdered Mo and MoS2 were synthesized in vapor phase reactions by a TEA-CO2laser-induced breakdown technique. Molybdenum particles were prepared from Mo (CO)6; molybdenum sulfide particles were prepared from a mixture of Mo (CO)6 and CS2. The particulatem aterials were characterized by scanning electron microscopy, ICP ctomic emission spectroscopy, and X-ray diffraction. The particles are monodispersed, neafly sphedcal, and 0.05-0.4μm indiameter. An X-ray diffraction study indicates that the Mo particle is crystalline and MoS2particle is amorphous. The yield of the Mo particle increased linearly with increasing laser pulseenergy.
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  • Ho3+Doped 2.84μm Laser Glass for Laser Knives, Sensitized by Yb3+
    Bo PENG, Teturo IZUMITANI
    1994 Volume 22 Issue 1 Pages 9-15
    Published: January 29, 1994
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.22.9
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    The fluorescence properties of the Ho3+5I6→5I7 transition in Yb3+-Ho3+codoped aluminozircofluoride glasses were investigated. The emission wavelength of Ho3+ (5I6→→5I7) at 2.84 μm is almost the same as the vibration oscillation absorption of hydroxyl (OH-1) at 2.89 μm. The emission intensity of Ho3+(5I6→→5I7) transition in Yb3+-Ho3+codopedaluminozirco-fluoride glass is 4.5 times higher than commercial 2.7μm Er3+laser glass. As thelifetime of 5I7 level is longer than 5I6 level, the Nd3+, Eu3+, Pr3+, Sm3+ and Tb3+ were investigatedas deactivator for decreasing the lifetime of 5I7 level. Eu3+and Tb3+ are good candidates for deactivator because they have energy levels which are close to the Ho3+5I7 level todecrease the population of Ho3+5I7 level by energy transfer and have not energy levels whichare close to the Ho3+5I6 level or Yb3+2F5/2 level.
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  • The Fluorescence Properties of Eu3+ in Various Glasses and the Energy Transfer Between Eu3+ and Sm3+ in Borosilico-phosphate Glass
    Bo. PENG, Teturo IZUMITANI
    1994 Volume 22 Issue 1 Pages 16-27
    Published: January 29, 1994
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.22.16
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    For obtaining shorter wavelength laser glass without using nonlinear optical crystal, The fluorescence properties of Eu3+ were investigated in various glasses. The Eu3+ dopedborosilico-phosphate glass has the highest emission intensity of 5D0→→7F2 transition comparedwith other glasses, because it can be doped with high concentration of Eu3+. The energy transferand energy backtransfer in Eu3+ -Sm3+ doped borosilico-phosphate glasses were also investigated. The energy transfer from Sm3+ to Eu3+ is very efficient and the energy backtransferfrom Eu3+ to Sm3+ is low. The Eu3+ -Sm3+ doped borosilico-phosphate glass has a verystrong emission in visible range (0.61μm) for the 5D0→→7F2 (Eu3+) transition. The emission intensityis about the same as Nd3+ doped phosphate glass (LHG8) at 1.06μm.
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  • High Speed Operation of a Multidither Adaptive Optical System and Real-Time Compensation of Dynamic Phase Fluctuation
    Masakatsu SUGII, Hideaki SAITO
    1994 Volume 22 Issue 1 Pages 28-38
    Published: January 29, 1994
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.22.28
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    A high speed operation of a multidither adaptive optical system (MAOS) with a ninesegmented adaptive mirror and real-time compensation of dynamic phase fluctuation has beendemonstrated. Experimental results are as follows: (1) A high speed operation of MAOS withan indicial response time of 55 ms has been achieved with a new type of wavefront controlmethod by using the saturation characteristics of a photo-detector (2) Dynamic CO2-laserwavefront distortion with a spot dancing of 47 μrad (rms), induced by two gas burners, hasbeen compensated in real time by the high-speed operation of the control system. The laserbeam was then converged within a nearly diffraction limit, improving the laser peak intensity by afactor of 2.8 with a Strehl Ratio of 0.8. A frequency spectrum measurement of the detectorsignal also confirmed that the turbulence spectrum component was automatically suppressed.
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  • A Study on the Accuracy of the Phase Measurement of Distance-Measuring Instrument Using Amplitude-Modulated Laser Light
    Naoto TAKADA, Akira NISHIWAKI
    1994 Volume 22 Issue 1 Pages 39-42
    Published: January 29, 1994
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.22.39
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    We intended to develop a distance-measuring instrument with accuracy of ±0.3 mm atseveral meter range, using an amplitude-modulated diode laser light as a carrier light beam and a heterodyne phase comparating system. With this setup we studied error factors which influence the accuracy of the phase measurement. The study essentially aimes (i) to ensure asufficient signal-to-noise ratio for received signals, (ii) to take care of input levels of mixer circuits, (iii) to ensure a rigorous symmetry about a beam splitter for two optical paths, and (iv) to ensure a symmetry for two radio-frequency signal circuits. Results are satisfactory.
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  • [title in Japanese]
    1994 Volume 22 Issue 1 Pages 43-56
    Published: January 29, 1994
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.22.43
    JOURNAL FREE ACCESS
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