High-average-power KTP ring OPO

Larry S. Lingvay; Nahum Angert; Michael Roth

doi:10.1117/12.379929

23 March 2000 High-average-power KTP ring OPO

Larry S. Lingvay, Nahum Angert, Michael Roth

Proceedings Volume 3928, Nonlinear Materials, Devices, and Applications; (2000) https://doi.org/10.1117/12.379929
Event: Symposium on High-Power Lasers and Applications, 2000, San Jose, CA, United States

Abstract

A KTiOPO₄ (KTP) OPO operating at an average power level of 26.3 W was demonstrated. To our knowledge this is the highest average power that a KTP OPO has ben operated at to date. The OPO used three 1 sq. cm aperture KTP crystal cut for non-critical phase matching at 1.064 micrometers . The crystals were 10 by 10 by 20 mm in size, cut from a large crystal, which was grown from a modified self-flux by pulling on an x-oriented seeded. The pump laser operated at 100 pps repetition rate at an average power of just over 71 watts, and pump power densities above 60 MW/sq. cm. All of the elements were AR coated for 1.06 micrometers and 1.576 micrometers . Signal wavelength conversion efficiency of 37 percent was achieved in this configuration. Idler output was not measured, but no thermo-lensing was observed due to the enhanced transmission of our crystals at the idler wavelength of 3277 nm. Some crystal damage was observed over time, apparently due to pump laser instability. The result are especially interesting since past experience had shown that KTP elements fail rapidly under these high average power conditions. Future work will compare the performance of a single long KTP OPO element with that of multiple short elements, in the same resonator.

Citation Download Citation

Larry S. Lingvay, Nahum Angert, and Michael Roth "High-average-power KTP ring OPO", Proc. SPIE 3928, Nonlinear Materials, Devices, and Applications, (23 March 2000); https://doi.org/10.1117/12.379929

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