The Review of Laser Engineering

[title in Japanese]

Hisao OKA

1993 Volume 21 Issue 5 Pages 549
Published: May 29, 1993
Released on J-STAGE: February 26, 2010

DOIhttps://doi.org/10.2184/lsj.21.5_549

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Phase of Stimulated Radiation

Masahiko HIROOKA

1993 Volume 21 Issue 5 Pages 550-556
Published: May 29, 1993
Released on J-STAGE: February 26, 2010

DOIhttps://doi.org/10.2184/lsj.21.5_550

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With the help of the quantum theory of radiation, it is shown that the stimulated radiation from an atom has the same direction and phase dependence as the incident stimulating radiation.

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Present Development of High Power Lasers in Russia

Masahiro NAKATSUKA

1993 Volume 21 Issue 5 Pages 557-565
Published: May 29, 1993
Released on J-STAGE: February 26, 2010

DOIhttps://doi.org/10.2184/lsj.21.5_557

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The recent some technologies in Russia on high power lasers are reviewed. The potential of Russia is inherently seen to have higher level at these fields in which some institutes are now opened to foreign visiters. Large dimension optics, laser materials and nonlinear optic crystals are developed and phase conjugation technology is generally used in high power laser systems. Fusion-fission hybrid reactor project with a nuclear pump laser is proposed. The medical and energetic laser development and its application are seemed main issues in restructuring institutes.

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High Repetition-Rate Excimer Laser (II)

-4kHz, 200W XeCl laser operation in low Xe contens

Shigeyuki TAKAGI, Koji KAKIZAKI, Noboru OKAMOTO, Saburo SATO, Tatsumi ...

1993 Volume 21 Issue 5 Pages 566-576
Published: May 29, 1993
Released on J-STAGE: February 26, 2010

DOIhttps://doi.org/10.2184/lsj.21.5_566

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A high repetition-rate excimer laser has been developed, in which a 4-stage axial blower circulates the laser gas up to 120 m/s. The discharge region of 10 × 20 × 610 mm3 is UV-preio-nized by pin sparks located along both sides of main electrodes. The output characteristics of XeCl laser were optimized for high repetition rate operations, varying conditions such as total gas pressure, gas mixture ratio, and applied voltage. High Xe contents were found to deterio-rate the laser stability. The residual Xe2+ and Cl ions localized on the cathode surface are sup-posed to generate filamentary channels, which cause laser energy reduction. Stable 4 kHz op-eration was achieved at a clearance ratio CR =3 with 200 W average laser power in a gas mix-ture of Xe/HCl/He=1.06/0.27/177 kPa.

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Optically Bistable Device Using a Laser Diode and an Er-Doped YAG

Yoshinobu MAEDA

1993 Volume 21 Issue 5 Pages 577-582
Published: May 29, 1993
Released on J-STAGE: February 26, 2010

DOIhttps://doi.org/10.2184/lsj.21.5_577

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Optical signal inverter and memory were demonstrated through a purely optical approach in a simple structure composed of a laser diode and an Er-doped YAG crystal. The intensity of an output laser transmitted through the Er: YAG was suddenly decreased by increasing the injection current to put the oscillation wavelength of the laser close to the central absorption peak of the Er: YAG at 787.6nm. In addition, the transmission of the Er: YAG versus injection current char-acteristics showed hysteresis and optical bistability. These effects were caused by the red shift and the hysteresis of the wavelength of the laser diode against the injection current. With the use of these effects, the optical signal inverter and memory were realized at a response time of 100ps.

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A Combined Facility of a Hybrid Accelerator, Storage Ring and Free Electron Laser

Mititaka TERASAWA, Chiyoe YAMANAKA

1993 Volume 21 Issue 5 Pages 583-589
Published: May 29, 1993
Released on J-STAGE: February 26, 2010

DOIhttps://doi.org/10.2184/lsj.21.5_583

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The design study of a storage-ring-driven free electron laser for short wavelength radiations was performed. We discussed this design to install a high-energy synchrotron which is usable in time sharing as both an electron injector for the storage ring and a heavy ion accelerator.

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Ultrahigh-Stabilized Laser-Diode Pumped Nd : YAG Lasers

Noboru Uehara, Ken-ichi Ueda

1993 Volume 21 Issue 5 Pages 590-600
Published: May 29, 1993
Released on J-STAGE: February 26, 2010

DOIhttps://doi.org/10.2184/lsj.21.5_590

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We describe frequency stabilization of laser-diode-pumped Nd: YAG lasers. We measure the beat-note signal of lasers locked to a high-finesse Fabry-Perot cavity. As the result, beat line-width of 193mHz and the drift of 54Hz during 10 minutes is obtained. This linewidth is 0.73 times of the Schawlow-Townes noise limited linewidth of 266mHz and this is the first demonstra-tion of a solid-state laser of less than the Schawlow-Townes limit.

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Report on Short Wavelength V

Shoichi KUBODERA

1993 Volume 21 Issue 5 Pages 601-606
Published: May 29, 1993
Released on J-STAGE: February 26, 2010

DOIhttps://doi.org/10.2184/lsj.21.5_601

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[title in Japanese]

1993 Volume 21 Issue 5 Pages i
Published: May 29, 1993
Released on J-STAGE: February 26, 2010

DOIhttps://doi.org/10.2184/lsj.21.5_i

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