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A stable and reliable front-end based on cw fiber laser has been developed. A fast LN modulator switches out arbitrary pulse shape with response time of 250 ps. Laser pulses from the modulator are amplified by 3 stage fiber amplifiers up to 1 muJ. Amplification properties of the main amplifier chain was measured. A 6.6-W Yb:SiO2 fiber front end operating at a repetition rate of 100 kHz with 13 ns...
This paper reports a design and fabrication technique of high-power handling MEMS (micro electro mechanical systems) optical scanner for laser 3D image display application. The MEMS scanner is designed to control the reflection of high-power YAG-laser beam of 5 W (0.5 mW/pulse) by the optomechanical combination of a dielectric-film coated mirror cube and an electrostatic MEMS scanner platform.
A liquid-cooled ceramic Nd:Cr:YAG split-disk laser amplifier have been designed and demonstrated for high-average-power laser system. The maximum small-signal gain of 2.27 and the stored energy of 11.4 J were obtained. The Nd:Cr:YAG showed 1.3 fold amplification efficiency than Nd:YAG.
We demonstrated the compensation of thermal lens effect regardless of pumping condition by inserting a solid-state CE, compensating element, having negative dn/dT property between two rods. This scheme of thermal compensation of rod systems is an ultimate method because of its dynamic compensation feature independent of the pumping power level.
We have been developing a high repetition (5 kHz) and high power (5 kW) Nd:YAG laser system pumped by cw LDs for EUV lithography. Design concepts and experimental results will be reported.
Thermally induced birefringence and thermal lensing in Nd:YAG rod amplifier was compensated by a 90deg rotator with three sets of imaging optics. Experimentally, 2.8% single pass birefringence loss was achieved and a nearly diffraction limited amplified output was observed.
We observed laser oscillations of rod-type Nd/Cr:YAG ceramics experimentally pumped using an arc-metal-halide lamp having a similar spectrum to solar light. An high optical-optical conversion efficiency of 43% was obtained by Cr ions co-doping.
We have designed a compact solid compressor by stimulated Brillouin scattering used in a fused silica glass. An 13 ns Nd:YAG laser pulse has been temporally compressed to a 1.2 ns pulse at 1064 nm.
We have demonstrated a split-disk laser amplifier with the largest ceramic Nd:Cr:YAG of 70 times 40 times 10 mm dimensions. One pass gain and total stored energy were 2.27 and 11.4 J, respectively.
Summary form only given. A high thermally resistant material for a high average power laser has been required with scalability because the present laser materials do not have the necessary thermal properties. Quartz glass is a very special material which has not only a low thermal expansion coefficient indicating high thermal tolerance, but also high transmittance in the ultraviolet region, and a...
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