11 April 1996 Phase conjugation for realizing lasers with diffraction-limited beam quality and high average power
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Abstract
Phase conjugation by SBS (stimulated Brillouin scattering) is a powerful and simple tool to increase the beam quality of high power lasers up to the diffraction limit. Master oscillator and power amplifier systems with Nd:YAlO as active medium were realized with an average output power up to 210 watts at 1.08 micrometer in a near diffraction limited beam. Also Nd:YAG-oscillators with phase conjugating mirrors were realized with an average output power up to 17 watt and high beam quality. In the UV range, excimer oscillators with SBS mirrors deliver the same or better beam quality than conventional plane-plane resonators in 3 times shorter pulses. Excimer oscillator-amplifier arrangements have been realized with SBS mirrors. SBS mirrors for the visible and ultraviolet spectral range are well characterized. First experiments for an ordered passive fiber bundle with an SBS mirror show the possibilities and limitations to improve the beam quality of fiber bundle amplifies or even oscillators.
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Hans Joachim Eichler, Hans Joachim Eichler, Andreas Haase, Andreas Haase, Baining Liu, Baining Liu, Joerg Schwartz, Joerg Schwartz, } "Phase conjugation for realizing lasers with diffraction-limited beam quality and high average power", Proc. SPIE 2771, Laser Optics '95: Phase Conjugation and Adaptive Optics, (11 April 1996); doi: 10.1117/12.238067; https://doi.org/10.1117/12.238067
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