A CrTmHo:YAG laser pumped ZnGeP2 optical parametric oscillator for mid-infrared spectroscopy

Ab F. Nieuwenhuis; Chris J. Lee II; Peter J.M. van der Slot; Ian D. Lindsay; Petra Groß; K.-J. Boller

doi:10.1117/12.763134

13 February 2008 A CrTmHo:YAG laser pumped ZnGeP₂ optical parametric oscillator for mid-infrared spectroscopy

Ab F. Nieuwenhuis, Chris J. Lee II, Peter J.M. van der Slot, Ian D. Lindsay, Petra Groß, K.-J. Boller

Proceedings Volume 6875, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VII; 68751G (2008) https://doi.org/10.1117/12.763134
Event: Lasers and Applications in Science and Engineering, 2008, San Jose, California, United States

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.

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Ab F. Nieuwenhuis, Chris J. Lee II, Peter J.M. van der Slot, Ian D. Lindsay, Petra Groß, and K.-J. Boller "A CrTmHo:YAG laser pumped ZnGeP₂ optical parametric oscillator for mid-infrared spectroscopy", Proc. SPIE 6875, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VII, 68751G (13 February 2008); https://doi.org/10.1117/12.763134

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KEYWORDS

Optical parametric oscillators

Crystals

Spectroscopy

Q switched lasers

Absorption

Laser crystals

Mirrors

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