Dynamic compensation of thermal lensing and birefringence in a high-brightness Nd:Cr:GSGG oscillator

Inon Moshe; Steven M. Jackel; Raphael Lallouz; I. Tzuk

doi:10.1117/12.281333

22 September 1997 Dynamic compensation of thermal lensing and birefringence in a high-brightness Nd:Cr:GSGG oscillator

Inon Moshe, Steven M. Jackel, Raphael Lallouz, I. Tzuk

Proceedings Volume 3110, 10th Meeting on Optical Engineering in Israel; (1997) https://doi.org/10.1117/12.281333
Event: 10th Meeting on Optical Engineering in Israel, 1997, Jerusalem, Israel

Abstract

In this work, five fundamental concepts were combined to a low development of high efficiency, low divergence, narrow bandwidth, flashlamp pumped oscillators capable of operation over a broad operating range. These concepts were: flashlamp pumped Nd:Cr:GSGG to achieve high efficiency, a 'Reentrant Cavity' to eliminate birefringence losses, a variable radius back mirror in a hemispherical cavity to achieve maximum Gaussian beam fill factor, a very high damage threshold, spectrum narrowing output coupler fabricated using a stack of uncoated etalons to form a resonant reflector, a cylindrical zoom lens to completely eliminate astigmatism. The results were successful, and yielded an oscillator that produced 10 mJ, TEM₀₀ 300 MHz bandwidth, 75 ns pulses, over a repetition rate of 1-20 Hz, and at a slope efficiency of 2 percent. These techniques were also successfully applied to a YLF oscillator. They may, in part, be adapted for use to unstable resonators.

Citation Download Citation

Inon Moshe, Steven M. Jackel, Raphael Lallouz, and I. Tzuk "Dynamic compensation of thermal lensing and birefringence in a high-brightness Nd:Cr:GSGG oscillator", Proc. SPIE 3110, 10th Meeting on Optical Engineering in Israel, (22 September 1997); https://doi.org/10.1117/12.281333

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