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Proceedings Paper

Optical parametric amplification of mid-infrared radiation using multi-layer glass-bonded QPM GaAs crystals
Author(s): Brian J. Perrett; Paul D. Mason; Pamela A. Webber; Simon C. Woods; David A. Orchard
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Paper Abstract

Non-linear optical wavelength conversion of near-infrared lasers within optical parametric oscillators (OPOs) offers a route to powerful tunable sources in the mid-infrared (mid-IR). Engineered quasi-phasematched (QPM) non-linear optical materials based on gallium arsenide (GaAs) offer an alternative to conventional birefringently phasematched single-crystal materials such as ZnGeP2, which are currently used in mid-IR OPOs. QPM GaAs crystals have been assembled from commercially available, high-optical quality 100-micron thickness gallium arsenide (GaAs) wafers using a novel glass-bonding (GB) process. This uses thin layers of an infrared transmitting glass (refractive index matched to GaAs) deposited onto each GaAs wafer, which, when heated under pressure, fuse the wafers together to form a monolithic structure. By varying the thickness of the deposited glass layers, the dispersion in the glass can be used to compensate for variations in GaAs wafer thickness and to fine tune the phasematching wavelengths of the QPM crystal. GBGaAs crystals with up to 100 layers have been designed and built for wavelength conversion from 2 &mgr;m into the mid-IR. We report the performance of these crystals used as optical parametric amplifiers (OPAs) in the mid-IR, when pumped by a 2.094 &mgr;m source, and compare these results to measurements for a ZGP OPA. In addition, the dependence of conversion within GBGaAs crystals on the polarisation state of the amplifier seed beam has been investigated along with the temperature dependence of the optimum operating wavelength. Good agreement between experimental results and performance predictions obtained from a numerical model is observed.

Paper Details

Date Published: 14 February 2007
PDF: 9 pages
Proc. SPIE 6455, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VI, 64550A (14 February 2007); doi: 10.1117/12.698942
Show Author Affiliations
Brian J. Perrett, QinetiQ Ltd. (United Kingdom)
Paul D. Mason, QinetiQ Ltd. (United Kingdom)
Pamela A. Webber, QinetiQ Ltd. (United Kingdom)
Simon C. Woods, QinetiQ Ltd. (United Kingdom)
David A. Orchard, QinetiQ Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 6455:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VI
Peter E. Powers, Editor(s)

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