The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 21, Issue 4
Displaying 1-12 of 12 articles from this issue
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  • [title in Japanese]
    Tomoo FUJIOKA
    1993 Volume 21 Issue 4 Pages 437-438
    Published: April 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.4_437
    JOURNAL FREE ACCESS
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  • CW CO2 Laser for Material Processing
    Toshiro KOIZUMI, Masahiro SUZUKI, Hidenao TANAKA
    1993 Volume 21 Issue 4 Pages 439-446
    Published: April 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.4_439
    JOURNAL FREE ACCESS
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    Beam quality of a CW CO2 laser is an important factor in laser processing of materials. We have demonstrated that stabilized discharge decreases instantaneous fluctuations of the power and the beam profile. Thermally induced optical distortion in a ZeSe output coupler and a lens is critical in the high power region. A TEM00-dominant mode causes more influence than a TEM01*-dominant mode on optical distortion, which affects beam propagation and focusability. The experimental result of piercing shows that the pulse shaping performance of laser is effective on material processing.
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  • Correlation between CO2 Laser Beam and Material Processing
    Takuma KATO, Hidehiko KARASAKI, Shigeki YAMANE
    1993 Volume 21 Issue 4 Pages 447-452
    Published: April 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.4_447
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    This paper briefly introduces experimental results on beam focusing properties and material processing phenomena using a fast axial flow CW CO2 laser.
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  • Slab CO2 Lasers
    Junichi NISHIMAE
    1993 Volume 21 Issue 4 Pages 453-461
    Published: April 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.4_453
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    Basic operating principles of slab CO2 lasers are reviewed. By using area scaling of the laser active medium in the form of waveguide slab which is cooled by diffusion, high average output power can be generated with no gas flow. The specific output power (output/slab area) reaches up to 10 to 20k W/m2. Radio-frequency discharge of the range of 100MHz is used to ensure effective laser excitation. Waveguide-unstable hybrid resonator is the key to extract output beam of good focusibility. Beam shaping technique to make the output beam symmertic is also described.
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  • High-Power TEA CO2 Lasers
    Katsumi MIDORIKAWA, Hideo TASHIRO
    1993 Volume 21 Issue 4 Pages 462-474
    Published: April 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.4_462
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    Progress of high-power TEA CO2 lasers is reviewed with paticular emphasis on pulse power conditioning by solid-state switching techniques. The use of the solid-state switches is a key technology forhigh-power, long-life operation because the life time of a discharge switch becomes a limiting factor of the operation life of such lasers. Another limiting factor is the degradation of the laser gas mixture. In this review, we summarize the present status of high power TEA CO2 lasers and then discuss on technical problems to be overcome for the development of high-repetition-rated TEA CO2 lasers. We also introduce two types TEA CO2 laser employing a solidstate exciter which is newly desinged and constructed for the demonstration of long-life and high-power operation.
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  • Characteristics of RF Excited CO2 Lasers
    Kiyohisa TERAI, Takaaki MURATA, Tohoru TAMAGAWA
    1993 Volume 21 Issue 4 Pages 475-484
    Published: April 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.4_475
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    RF discharge has recently been increasingly used for the excitation of CO2 lasers. This paper gives the characteristics of RF discharge which strongly depend on the excitation frequency. The discharge and the laser excitation characteristics of 1MHz and 13MHz were measured and com-pared with each other. Good laser pulsing characteristics, which are one of the features of RF discharge, were obtained without auxiliary discharge at both frequencies. As a result, we found that from the viewpoint of discharge physics 13MHz is preferable; however from the technical viewpoint 1MHz is better because we can use an efficient solid-state generator. We also show the performance of lasers using 1MHz or 13MHz, and a future trend of industrial CO2 lasers.
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  • Review on High Power Gas Dynamic CO2 Laser
    Hideaki SAITO, Takaaki MURATA
    1993 Volume 21 Issue 4 Pages 485-495
    Published: April 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.4_485
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    A gas dynamic CO2 laser (GDL) gives a high power output in 10 μm region. Because of recent evolution of CO2 laser in material processing industries, high power laser systems of 100 kW or more are expected to be developed. GDL is one of the most promissing lasers from this view point. Since 1970's, our research laboratory has been promoting novel combustion driven GDL technologies including gas phase, liquid phase, and solid state phase fuel/oxidizers. This paper describes current developments of high power gas dynamic CO2 lasers for understanding its potentiality to make powerful compact laser sources.
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  • Electron-Beam Controlled CO2 Lasers
    Yoneyoshi KITAGAWA
    1993 Volume 21 Issue 4 Pages 496-503
    Published: April 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.4_496
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    This paper reviews the characteristics and recent applications of electron-beam controlled CO2 lasers on the base of the system of the Osaka University. The system has much advantages over TEA lasers. It can provide intense short pulses of as high as 1kJ energy and as short as 1 ns or less width. Many systems are used for the studies of nonlinear interaction with matters, such as a beat-wave accelerator.
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  • Characteristics of Gas Degradation in a High-Power 100 Hz TEA CO2 Laser and its Long-Term Operation
    Akira SUDA, Masatoshi MAKI, Masashi KURACHI, Hiroshi TANAKA, Katsumi M ...
    1993 Volume 21 Issue 4 Pages 504-513
    Published: April 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.4_504
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    Using a 100 Hz TEA CO2 laser with a gas recycler, we have made the experimental investigation of laser gas degradation over a wide range of operating conditions. It was verified that both the decrease in the laser power and the onset of arcing were closely related to the O2 concentration. A simple and practical model was also developed to describe the O2 production and accumulation by discharge in the laser gas. By providing a large-scale gas recycler based on the O2 analysis, long-term operation was successfully attained with an average power of 500 W at a repetition rate of 100 Hz.
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  • Stabilization of Double-Line CO2 Laser Oscillation for Beat-wave Acceleration
    Kazuya MATSUO, Yoneyoshi KITAGAWA, Kiyonobu SAWAI, Sadao NAKAI
    1993 Volume 21 Issue 4 Pages 514-519
    Published: April 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.4_514
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    The CO2 laser group at the Institute of Laser Engineering, Osaka University is equipped for doing on the laser beat-wave acceleration experiment. By injection-locking with the 9P (22) line in a piezoelectric-controlled CO2 laser cavity, we have obtained a well-balanced double line oscillation of the 9P (22) and 10P (20) lines, that is to say, the shot to shot stability as for the double line balance is more than 90%. The total output is 300 J in 1 ns pulse. The energy and balance between two lines are suited for the beat-wave acceleration.
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  • Report on Topical Meeting of Advanced Solid State Lasers and Compact Blue-Green Lasers
    Shinsuke UMEGAKI, Hisayoshi TORATANI
    1993 Volume 21 Issue 4 Pages 520-528
    Published: April 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.4_520
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  • [title in Japanese]
    1993 Volume 21 Issue 4 Pages i
    Published: April 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.4_i
    JOURNAL FREE ACCESS
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