The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 18, Issue 2
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    Tadashi TAKAHASHI
    1990 Volume 18 Issue 2 Pages 52-53
    Published: 1990
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.18.2_52
    JOURNAL FREE ACCESS
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  • Noise Characteristics of a VSIS Laser Induced by Optical Feedback
    The Effect of a Uniform Active Layer
    Kazuaki SASAKI, Masaki KONDO, Yoshiro AKAGI, Yoshiharu NAKAJIMA, Sabur ...
    1990 Volume 18 Issue 2 Pages 54-60
    Published: 1990
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.18.2_54
    JOURNAL FREE ACCESS
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    Noise characteristics induced by optical feedback are investigated for two types of single longitudinal mode lasers. One is a conventional VSIS (V-channeled substrate inner stripe) laser and the other is a VSIS laser with a number of grooves on both sides of the V-channel. In this modified VSIS laser, we obtained a thin p-cladding layer and a uniform active layer. In the modified VSIS laser with a uniform active layer, a gain modulation pattern observed in the conventional one is eliminated. In addition, the noise level is found to be smaller than that of the conventional one when optical feedback (F-0.05%) exists, mainly due to the difference in the mode hopping behavior between two types of lasers. These results verify that the uniformity of the active layer is essential for improving the noise characteristics induced by optical feedback.
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  • Eundamental Study on a Photoacoustic Microscope
    Using a CO2 Laser
    Tetsuya TANIYAMA, Kaoru SUZUKI, Junji NAKATA
    1990 Volume 18 Issue 2 Pages 61-68
    Published: 1990
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.18.2_61
    JOURNAL FREE ACCESS
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    Germanium, aluminum, and stainless-steel plates were irradiated with a pulsed CO2-laser beam (10.6μm) focused to be 0.1 mm in diameter, and resulting optical acoustic signals were measured with a PZT piezoelectric element. Results indicate that deposits on the surface and internal damage can be detected from the signal magnitude and phase angle, effectively by using repetitivefrequencies more than 100 Hz.
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  • Frequency Stabilization of an Internal-Mirror He-Ne Laser by Means of a Microprocessor Controller
    Masahiro TOKONAMI, Tatehisa OHTA, Wakao SASAKI, Fumio MURAKAMI
    1990 Volume 18 Issue 2 Pages 69-78
    Published: 1990
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.18.2_69
    JOURNAL FREE ACCESS
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    Simultaneous stabilization of the amplitude and frequency of a two-mode internal-mirror He-Ne laser (λ=633 nm) using a microprocessor controller is reported. The intensity difference between two orthgonally-polarized axial modes normalized by the total intensity is caluculated as a controlled signal. The cavity length is controlled by manipulating the current of a heater wound around the laser tube according to digital PID or I-PD algorithms so that the controlled signal coincides with a reference signal. By adjusting the reference signal, stabilized laser frequency can be tuned within ±300 MHz around the mean frequency of the atomic resonance frequencies of 20Ne and 22Ne. Frequency stability estimated by the error between the controlled and reference signals is better than 3×10-8 over a period of 30 minutes. Beat frequency fluctuations between two stabiliezed lasers over a 8 minutes are in the range 1×10-8 to 2×10-8 depending on the selected direction of polarization.
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  • A Maintenance-Free TEA Nitrogen Laser for Analytical Spectroscopy
    Yuji OKI, Hisanori UDA, Chikahisa HONDA, Mitsuo MAEDA, Masaaki NAGAKUR ...
    1990 Volume 18 Issue 2 Pages 79-83
    Published: 1990
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.18.2_79
    JOURNAL FREE ACCESS
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    A reliable, microcomputer-controlled nitrogen laser was developed, as a pumping source of a tunable dye laser for industrial analytical spectrometry. Long-term maintenance-free operation was attained by the use of internal gas circulation, automatic ga exchange, and output stabilization. TEA laser action with a gas mixture of He/N2 made the gas exchange easy. The output power was 400 kW, and the maximum repetition rate was 60 Hz.
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  • Report on the 12th International Conference on Lasers and Applications (LASERS'89)
    Hajime NISHIOKA, Tarou UCHIYAMA
    1990 Volume 18 Issue 2 Pages 84-87
    Published: 1990
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.18.2_84
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1990 Volume 18 Issue 2 Pages plate1
    Published: 1990
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.18.2_plate1
    JOURNAL FREE ACCESS
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