Title

Measurement and Modeling of Infrared Nonlinear Absorption Coefficients and Laser-induced Damage Thresholds in Ge and GaSb

Document Type

Article

Language

eng

Publication Date

2010

Publisher

OSA Publishing

Source Publication

Journal of the Optical Society of America B

Source ISSN

0740-3224

Abstract

Using a simultaneous fitting technique to extract nonlinear absorption coefficients from data at two pulse widths, we measure two-photon and free-carrier absorption coefficients for Ge and GaSb at 2.05 and 2.5 μm for the first time, to our knowledge. Results agreed well with published theory. Single-shot damage thresholds were also measured at 2.5 μm and agreed well with modeled thresholds using experimentally determined parameters including nonlinear absorption coefficients and temperature dependent linear absorption. The damage threshold for a single-layer Al2O3 anti-reflective coating on Ge was 55% or 35% lower than the uncoated threshold for picosecond or nanosecond pulses, respectively.

Comments

Journal of the Optical Society of America B, Vol. 27, No. 10 (2010): 2122-2131. DOI. © 2010 U.S. Government.

Ronald A. Coutu, Jr. was affiliated with Air Force Institute of Technology, Wright Patterson Air Force Base, Ohio at the time of publication.

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