The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 21, Issue 9
Displaying 1-9 of 9 articles from this issue
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  • [title in Japanese]
    Mikio KITADA
    1993 Volume 21 Issue 9 Pages 937
    Published: September 29, 1993
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.21.9_937
    JOURNAL FREE ACCESS
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  • Frequency Stabilization of an Internal-Mirror He-Ne Laser using an Axial Mode Beat
    Akira SASAKI, Takehiko OKADA, Sunao KAWAI, Hisayuki AOYAMA
    1993 Volume 21 Issue 9 Pages 938-944
    Published: September 29, 1993
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.21.9_938
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    The frequency of a commercially available internal-mirror He-Ne laser (λ=633nm) was stabilized by using an axial-mode beat frequency. The beat-frequency conversion technique between the axial-beat frequency and the output signal of a frequency synthesizer was used for the laser frequency stabilization. The frequency stability of 4.5×10-10 was estimated by means of the Allan variance analysis. The amplitude stability of this stabilized laser was estimated to be 0.21 %.
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  • Fabrication of Optical Non-Circular Lenses by a Laser Ion-Exchange Method and Its Analysis.
    Shigenori MATSUI
    1993 Volume 21 Issue 9 Pages 945-952
    Published: September 29, 1993
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.21.9_945
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    The growing use of optical lenses in optical integrated circuits has necessitated finding a better, more cost-effective way of producing them. We have succeeded in developing a method of producing high-quality micro lenses on soda-lime grass plates by combining laser annealing and ion-exchange; The method is referred to as a “Laser Ion-Exchange Method”. The use of this technique makes it increase the refractive indexes on both sides of a soda-lime glass plate to create an optical lens. The upper surface of the glass is annealed by CO2 laser beam irradiation while the underside is subjected to ion-exchange between Na+ of the glass and K+ of KNO3 of an immersion bath. This method was applied to producing circular, non-circular, linear and array micro-lenses.
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  • Basic Control Characteristics of a Multidither Adaptive Optical System
    Masakatsu SUGII, Hideaki SAITO, Yuuji ICHINOSE, Tosiaki UENO, Haruo KA ...
    1993 Volume 21 Issue 9 Pages 953-964
    Published: September 29, 1993
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.21.9_953
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    This paper describes the basic control characteristics of a multidither adaptive optical system using a new type of segmented deformable mirror and a newly developed control algorithm. Fairly stable operation of the optical system has been obtained successfully, and CO2 laser beam distortion induced by a static aberrator has been corrected automatically. Experimental results are: (1) A phase compensation accuracy of 1/19 wavelength was obtained; (2) The shortest phase reconstruction time of 830 ms was obtained with an S/N ratio of>10; (3) The laser peak intensity at a focal point was improved by a factor of 3.5, which was almost the same value as that of theoretical limit; and (4) A compensation experiment for a static aberrator showed that the phase-error is corrected with a high strehl ratio of about 100%.
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  • Second Harmonic Generation of Chemical Oxygen Iodine Laser
    Noriaki MIURA, Ryo KOTEGAWA, Minoru MATSUO, Taro UCHIYAMA
    1993 Volume 21 Issue 9 Pages 965-973
    Published: September 29, 1993
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.21.9_965
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    A Chemical Oxygen Iodine Laser (COIL; wavelength=1.315 μm) is expected to be a new useful laser particularly for material processing in the future. A COIL generating half wavelength output beam by intracavity second hermonic generation (SHG) can improve processing quality To shorten wavelength of the output beam of COIL by intracavity second harmonic generation (SHG) improves the processing efficiency. In the present study, LBO was utilized as a nonlinear crystal. Experiments were carried out to obtain a large second harmonic power and to estimate internal conversion and extraction efficiencies. The optimum cavity conditions forintracavity SHG of COIL were determained by using several optical cavities. A total second harmonic power of maximum of 7.4 W was obtained. The internal conversion efficiency was about 0.6 % and the extraction efficiency was 100 % for a multi-mode fundamental beam.
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  • An Application of Excimer Laser for the Crosslinking of Polyethylene
    Masahiro UEDA, Fujio SAKAN, Hideki TANAKA, Hitoshi FUJII, Kiyoaki SAKA ...
    1993 Volume 21 Issue 9 Pages 974-980
    Published: September 29, 1993
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.21.9_974
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    An excimer laser has been employed for the crosslinking of polyethylene at room tempera-ture using chlorobenzophenone (CBP) or benzophenone (BP) as a photoinitiator. The irradia-tion dose of the excimer laser light is about 450 J/g (sample weight) and the concentration of the photoinitiator ranges from 0.01 to 1.0% in weight. An overall gel content of about 30-35% is obtained for a sample with a thickness of 1.2 mm, although it locally reaches above 50% in the vicinity of the surface up to 0.3 mm in depth. The crosslinking is observed only near the irradiated surface of a sample within 0.3 mm in depth for a high photoinitiator concentration of 1.0%, while the homogeneous crosslinking is occurred up to about 2mm in depth for a very low concentration of 0.01%. The crosslinking rate decreases linearly with a depth for a con-centration of 0.1%.
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  • Titanium Diffusion into LiNbO3 Crystals
    -Crystal Surface Observations at the Diffusion Process-
    Hirosuke FURUTA, Hiroyuki IRIE, Hidesi MIZUMOTO, Tokuo MIYAMOTO
    1993 Volume 21 Issue 9 Pages 981-986
    Published: September 29, 1993
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.21.9_981
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    Titanium diffused LiNbO3 crystals are widely used in integrated optics. This paper reports the observations of the LiNbO3 crystal surface under the diffusion of Ti. At the first stage of the diffusion process, Ti diffusion areas swelled up to about 3 times that of the initial metal Ti film thickness, and the surface roughness increases. On the progress of diffusion, the height and roughness of the Ti diffusion area decrease; finally the height becomes 1.5-2 times as small as that of the initial metal Ti thickness, and the surface roughness becomes as small as the initial condition. After the diffusion time calculated based on the experimental diffusion coefficie, the crystal surface becomes smooth.
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  • Displacement Measuring System using a Fizeau Interferometer
    Hideo FURUHASHI, Yoshiyuki UCHIDA, Jun YAMADA, Hiroshi MIYAKE, Takahid ...
    1993 Volume 21 Issue 9 Pages 987-991
    Published: September 29, 1993
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.21.9_987
    JOURNAL FREE ACCESS
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    A displacement measuring system has been developed using a Fizeau interferometer without polarizers. The system is simple in construction and compact. A reference mirror with a λ/8 step on one side was used instead of polarizers. A High resolution of 0.2 μm was obtained with a semiconductor laser of 780 nm. The wavelength of the peak laser oscillation was calibrated by measuring the temperature of the case to improve accuracy. The errors of the measurements are discussed in detail and are estimated to be ± (0.20 μm+0.75%). The system was used to measure the displacement of a pulse stage, and the characteristics of the stage were measured. The measuring system proves to be highly accurate in displacement measurement.
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  • [title in Japanese]
    1993 Volume 21 Issue 9 Pages i
    Published: September 29, 1993
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.21.9_i
    JOURNAL FREE ACCESS
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