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28 June 1999 Nonlinear absorption and laser damage threshold measurements of doped ZnGeP2
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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.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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);


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