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4 May 1999 Multi-amplifier arrangements with phase conjugation for power scaling of solid state lasers with high beam qualtiy
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Abstract
Solid state lasers with high average output power in conjunction with high beam quality are required for high brightness applications in industry and science. In master oscillator power amplifier arrangements (MOPA) with phase conjugation the beam quality is determined by the master oscillator and largely preserved after double pass amplification. This paper deals with multi amplifier arrangements to cover a power range up to 1 kW. A serial arrangement reduces the required oscillator power to operate the amplifiers in saturation regime. Using optical systems between the amplifiers the average output power is tunable by variation of average pumping power. Several serial amplifier chains can be coupled parallel to divide the total average output power to various beam lines with moderate amplifier apertures. Different multi amplifier systems are discussed with regard to their possible average output power and beam quality. A flash lamp pumped MOPA system which supplies average output powers above 500 W is described. The system consists of two parallel coupled serial amplifier chains and two additional booster amplifiers. Beam quality and beam profile measurements have been carried out at different positions in the laser system. Average output powers up to 1 kW seem to be possible.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hans Joachim Eichler, Oliver Mehl, and Juergen P. Eichler "Multi-amplifier arrangements with phase conjugation for power scaling of solid state lasers with high beam qualtiy", Proc. SPIE 3613, Solid State Lasers VIII, (4 May 1999); https://doi.org/10.1117/12.347675
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