Nonlinear absorption and laser damage threshold measurements of doped ZnGeP2

Shekhar Guha; Mark Bartsch; Frank Kenneth Hopkins; Michael P. Eaton; Scott D. Setzler; Peter G. Schunemann; Thomas M. Pollak

doi:10.1117/12.351408

28 June 1999 Nonlinear absorption and laser damage threshold measurements of doped ZnGeP₂

Shekhar Guha, Mark Bartsch, Frank Kenneth Hopkins, Michael P. Eaton, Scott D. Setzler, Peter G. Schunemann, Thomas M. Pollak

Author Affiliations +

Proceedings Volume 3793, Operational Characteristics and Crystal Growth of Nonlinear Optical Materials; (1999) https://doi.org/10.1117/12.351408
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

Zinc germanium diphosphide (ZnGeP₂) has proven to be an important nonlinear optical crystal for the generation of midwave infrared radiation, especially in an optical parametric oscillator configuration pumped by a Ho:YAG laser operating at 2.09 micrometers. Future applications will require higher intensity levels of the laser pump beam which are limited by the crystal's laser damage threshold and nonlinear absorption. These two quantities were measured for silver-doped ZnGeP₂ samples of which was uncoated, two had conventional anti-reflection coatings, and one had an AR coating with a quintic refractive index profile. Prominent nonlinear absorption was observed in some of the crystals; the nonlinear absorption coefficient was found to be anisotropic and a weak correlation between the values of the linear and the nonlinear absorption coefficient was observed. The values of the nonlinear optical coefficients measured in these crystals for ordinary and extraordinary polarizations of incident light are reported along with the measured values of the laser damage threshold of these newly grown crystals at 2.09 micrometers, both in the AR coated and uncoated forms.

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Shekhar Guha, Mark Bartsch, Frank Kenneth Hopkins, Michael P. Eaton, Scott D. Setzler, Peter G. Schunemann, and Thomas M. Pollak "Nonlinear absorption and laser damage threshold measurements of doped ZnGeP₂", Proc. SPIE 3793, Operational Characteristics and Crystal Growth of Nonlinear Optical Materials, (28 June 1999); https://doi.org/10.1117/12.351408

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