The Review of Laser Engineering

[title in Japanese]

Kunihiko WASHIO

1993 Volume 21 Issue 8 Pages 825-826
Published: August 29, 1993
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.21.825

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Progress in the YAG Crystal Growth Techniqe for Solid State Lasers

Takio SEKINO, Yoshihiro SOGABE

1993 Volume 21 Issue 8 Pages 827-831
Published: August 29, 1993
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.21.827

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Nd: YAG is the most popular crystal for solid-state lasers because it has some good properties. Recent high power solid-state laser systems demand high quality and large scale YAG crystals. A new style automatic diameter control system is effective in crystal growth technique to produce YAG laser device for high power systems. YAG crystals that have some doping elements are applicable to measurement instruments, optical communication and the others. We are making efforts to improve the crystal growth technique for new applications.

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Renaissance of YAG Laser Cavity Construction

-New Construction for Laser Cavity: Introduction of Phase-Conjugate Mirror-

Kunio YOSHIDA, Hidetsugu YOSHIDA

1993 Volume 21 Issue 8 Pages 832-839
Published: August 29, 1993
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.21.832

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Phase-conjugate mirror (PCM) is very important to improve the wavefront distortion due to the optical pumping of solid state laser materials and the inhomogeneity of optical components. In this paper, the reflection experiment of PCM based on stimulated Brillouin scattering and the oscillation characteristics of YAG laser using PCM as a cavity mirror are described.

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Recent Developments of High-Brightness Slab Geometry Solid State Lasers

Kazuki KUBA

1993 Volume 21 Issue 8 Pages 840-849
Published: August 29, 1993
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.21.840

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Recent developments of high brightness solid state slab-geometry lasers are reviewed. Firstly the definitions of a brightness and a parameter of focusability: Q are described. Secondary, methods to realize the high brightness solid-state lasers are summarized. These methods are classified intothe three categories: (1) reduction of thermal distortion, (2) the compensation of thermal distortionand (3) a resonator for high beam quality. In these methods, a zigzag slab geometry laser withan unstable-stable hybrid-resonator is a promising candidate for a high bright-ness solid state laser. Finally, a list of the performances of high power slab geometry solid-state lasers is presented.

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Present Status of Laser-Diode Pumped High-Power Nd: YAG Lasers

Masanobu YAMANAKA

1993 Volume 21 Issue 8 Pages 850-858
Published: August 29, 1993
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.21.850

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The present status of laser-diode (LD) pumped high-power Nd: YAG lasers at 1.06μm is reviewed. With a side-pumped rod geometry, an output of of 1.25J per pulse is demonstrated. The LD-end-pumped Nd: YAG laser can produce an output power of CW 60W in a near-diffraction-limited beam. A one Joule per Q-switched pulse LD-pumped Nd: YAG zigzag-slab laser is constructed. A 1-kW average-power LD array-pumped folded zigzag-slab Nd: YAG laser is demonstrated at 2.25 kHz. A phase conjugated LD-pumped Nd: YAG MOPA laser architecture is proposed to have a 1 kW average power in a near-diffraction-limited beam. An LD pumped Nd: YAG regenerative amplifier is achieved simultaneously with a high gain (71dB) and a high energy extraction efficiency (48%) .

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Frequency Stabilization of LD-pumped YAG Lasers for Gravitational Wave Detection

Ken-ichi UEDA, Noboru UEHARA

1993 Volume 21 Issue 8 Pages 859-872
Published: August 29, 1993
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.21.859

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Frequency stabilized solid state lasers related to the gravitaional wave detection are reviewed. In order to detect gravitaional waves from super novae or a coallescence binary stars, the sensitivity should be higher than 10^-¹⁹ to 10^-²². A large interferometer is a possible solution if we can develop a stable light source, mode cleaner optics, free-mass optical cavity, anti-vibration systems operating at their quantum or theoretical limits. We measured the FM-noise at the shot noise limit by means of LD-pumped YAG lasers. The tracking capability was examined by the beatnote spectrum of 193 mHz directly. The measured spectrum and Allan root variance showed that the beat line width is determined by the thermal drift of reference cavities in two-laser and two-cavity mode. We report the present status of technological develop-ment of ultra-stabilized lasers, ultra-high quality optics, and high power lasers for gravitational wave measurements.

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Short-Pulsed High-Intensity Nd: YAG Lasers and Their Applications

Katsumi MIDORIKAWA, Satoshi WADA

1993 Volume 21 Issue 8 Pages 873-884
Published: August 29, 1993
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.21.873

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Recent progress of short-pulsed high-intensity Nd YAG lasers and their application to generation of coherent vacuum ultraviolet radiation are reviewed. For a nanosecond operation, use of an unstable resonator employing a variable-reflectivity-mirror greatly improves an output performance of a Q-switched Nd YAG laser. The smooth, large-sized and flat-topped TEM₀₀ output beams are ideal for nonlinear frequency conversion. The technique of injection seeding also improved efficiency of the frequency conversion and stability, avoiding random spikes in a pulse and optical damage of optics due to mode beating. For a picosecond operation, simultane-ous Q-switching and mode locking increase the energy in a single pulse by several orders of magnitude, compared to a continuous-wave actively mode-locked Nd : YAG laser. There has been also considerable progress in the development of Nd YAG amplifier by introducing regenerative amplification technique. These progress of short-pulsed high-intensity Nd YAG laser technology allows the development of new high-power coherent sources in vacuum ultraviolet region.

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High-Average-Power 266 nm Generation of Nd: YAG Laser and Its Industrial Applications

Noriaki GOTO, Hiroshi ITO

1993 Volume 21 Issue 8 Pages 885-893
Published: August 29, 1993
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.21.885

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High-average-power in the UV region has become more important for photochemical processing and microelectnics. UV light has generated by the fourth harmonic conversion from Nd: YAG lasers. We achieved an average power of 10-W at 532 nm by an intracavity LBO doubling in a CW-pumped acoustoptic Q-switched Nd: YAG laser at a repetition rate of 5 kHz. With this 532 nm output power, an average power of 2-W at 266 nm was generated by an extracavity conversion with BBO. This UV source can be used for removal processing of polymer films.

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Present and Future of Medical YAG Lasers

Norio DAIKUZONO

1993 Volume 21 Issue 8 Pages 894-898
Published: August 29, 1993
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.21.894

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The YAG laser plays a major role in surgery and medicine, owing not only to it's variety of wavelengths, but also to practical aspects, such as size, portability, cost, delivery system and high reliability. The YAG laser will expand its share in the major market of surgery, opht-halmology and dentistry based on it's specific properties such as contact surgery, pulse mode. Ho: YAG, Er: YAG, SHG, FHG or optical tuning. If the optical feedback parameters from tissue are combined with the medical YAG laser, highly advanced laser surgery and medicine will be achieved with great ease.

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The Obstacle Warning Lidar System Using LD Pumped Nd: YAG Lasers

Minoru DOSHIDA, Hideaki SAITO

1993 Volume 21 Issue 8 Pages 899-905
Published: August 29, 1993
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.21.899

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A obstacle warning lidar system for helicopters has been realized by using LD pumped Nd: YAG lasers. A ground test revealed that a wire of 3mm in diameter at 300mm was detectable without interference of background.

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Nd: YAG Lidars for Atmospheric Monitoring

Ichiro MATSUI

1993 Volume 21 Issue 8 Pages 906-913
Published: August 29, 1993
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.21.906

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Progress of Nd: YAG lidars for monitoring atmospheric environment is reviewed. Nd: YAG lasers are widely used for various lidar applications. In this review, we introduce YAG lidar techniques for monitoring air pollution in urban areas and for monitoring global atmosphere. These techniques include Mie-scattering lidars, Raman lidars, differential absorption lidars, and Doppler lidars. Nd: YAG lasers for space borne lidars are also discussed.

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Report on LASERION'93

Koji SUGIOKA

1993 Volume 21 Issue 8 Pages 914-918
Published: August 29, 1993
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.21.914

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Report on 9th IEEE International Pulsed Power Conference

Hidekazu HATANAKA

1993 Volume 21 Issue 8 Pages 919-923
Published: August 29, 1993
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.21.919

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[title in Japanese]

1993 Volume 21 Issue 8 Pages i
Published: August 29, 1993
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.21.8_i

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