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30 September 1996 Design and construction of high-power solid state laser amplifiers with phase conjugating mirror
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Beam quality improvement of high power solid state lasers for industry and science is a crucial point. A simple way to increase the beam quality of conventional flash lamp pumped rod systems is to use a phase conjugating mirror based on stimulated Brillouin scattering (SBS). Pulsed multi amplifier setups with SBS were investigated. Nd:YALO as active material was used to avoid stress birefringence and decrease of beam quality. In case of serial arrangements on optimized optical system between the individual rods is used to achieve high efficiency independent of thermal lensing. With a two amplifier system an average output power of 1 Watt up to 210 Watt in a near diffraction limited beam was realized. In case of parallel arrangements phase coupling of the individual beams was achieved using a common SBS-cell after the first amplifier pass. First experiments show an average output power of 50 W. CW-pumped MOPA-systems with SBS and repetition rates above 10 kHz are under development. A fiber phase-conjugator is used to reduce the power threshold down to 6 kW. An average output power of 14 Watt from a pulsed MOPA-system was achieved with a fiber phase- conjugator. As an application high power second harmonic generation was realized.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hans Joachim Eichler, Andreas Haase, Baining Liu, and Oliver Mehl "Design and construction of high-power solid state laser amplifiers with phase conjugating mirror", Proc. SPIE 2889, High-Power Lasers: Solid State, Gas, Excimer, and Other Advanced Lasers, (30 September 1996);

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