Pulsed solid state laser systems with high brightness by fiber phase conjugation

Thomas Riesbeck; Enrico Risse; Hans Joachim Eichler

doi:10.1117/12.515808

10 November 2003 Pulsed solid state laser systems with high brightness by fiber phase conjugation

Thomas Riesbeck, Enrico Risse, Hans Joachim Eichler

Proceedings Volume 5120, XIV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers; (2003) https://doi.org/10.1117/12.515808
Event: XIV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 2002, Wroclow, Poland

Abstract

Solid-state laser sources are required for numerous applications in industry and science. High output power while preserving a diffraction limited beam quality results in high brightness operation. However, conventional laser systems suffer from thermally induced phase distortions in the active medium, which considerably reduce the beam quality. Proper cooling, diode pumping, as well as active media with high quantum efficiency reduce the thermal load. But the still remaining phase distortions result in a reduction of beam quality. Phase conjugate mirrors are suitable to compensate for phase distortions in master oscillator power amplifier systems (MOPA). Stimulated Brillouin scattering (SBS) in commercial multimode silica fibers leads to reliable and stable phase conjugation. A further advantage is, that the fiber core diameter can be select in respect of the systems pulse energy to obtain the necessary intensity for high reflectivity SBS. Three systems with phase conjugators have been investigated. A pulse pumped, passively q-switched Nd:YAP System which delivers an average output power of 315 W with M² = 2.6. The pulse energy is about 160 mJ with a pulse width of 140 ns at 2 kHz repetition rate. Another pulse pumped MOPA system based on Nd:YAG with depolarization compensation delivers an average output power up to 124 W with M² = 2.2. Due to active q-switching the pulse repetition rate and peak power of this system are variable in a wide range. Furthermore a continuously pumped amplifier arrangement with nearly diffraction limited output of 120 W average power has been achieved at 10 kHz repetition rate.

Citation Download Citation

Thomas Riesbeck, Enrico Risse, and Hans Joachim Eichler "Pulsed solid state laser systems with high brightness by fiber phase conjugation", Proc. SPIE 5120, XIV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, (10 November 2003); https://doi.org/10.1117/12.515808

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