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Proceedings Paper

A CrTmHo:YAG laser pumped ZnGeP2 optical parametric oscillator for mid-infrared spectroscopy
Author(s): Ab F. Nieuwenhuis; Chris J. Lee; Peter J.M. van der Slot; Ian D. Lindsay; Petra Groß; K.-J. Boller
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Paper Abstract

We report a singly resonant optical parametric oscillator (SRO) based on a ZnGeP2 crystal directly-pumped by a lamp-pumped Q-switched CrTmHo:YAG laser. The IR wavelength was tuneable from 4.7 μm to 7.8 μm via crystal angle tuning. A maximum optical to optical efficiency of 56% was obtained from pump (2.09 μm) to total IR at a pump energy of 6.5 mJ. The corresponding idler energy was 1.45 mJ. The SRO was measured to have a slope efficiency of 64% and a threshold of 1 mJ. The spatial beam quality of the idler, characterized by the M2 parameter, was 1.38 when the SRO was pumped at 2.5 times threshold. These results show that ZnGeP2 OPOs directly pumped by a CrTmHo:YAG laser can be operated efficiently, while maintaining good IR beam quality. The wide tuning range and a high pulse energy makes this SRO particularly suitable for spectroscopic applications, and, tests in the field medical application, e.g., for cutting of soft tissue during surgery or corneal corrections.

Paper Details

Date Published: 13 February 2008
PDF: 9 pages
Proc. SPIE 6875, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VII, 68751G (13 February 2008); doi: 10.1117/12.763134
Show Author Affiliations
Ab F. Nieuwenhuis, Univ. of Twente (Netherlands)
Chris J. Lee, Univ. of Twente (Netherlands)
Peter J.M. van der Slot, Univ. of Twente (Netherlands)
Ian D. Lindsay, Univ. of Bristol (United Kingdom)
Petra Groß, Westfälische Wilhelms-Univ. of Münster (Germany)
K.-J. Boller, Univ. of Twente (Netherlands)

Published in SPIE Proceedings Vol. 6875:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VII
Peter E. Powers, Editor(s)

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