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

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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.
Original languageEnglish
Title of host publicationNonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VII
EditorsPeter E. Powers
Place of PublicationSan Jose, CA, USA
PublisherSPIE
Pages68751G-1-68751G-9
ISBN (Print)9780819470508
DOIs
Publication statusPublished - 20 Jan 2008

Publication series

Name68751G
PublisherSPIE
Volume6875
ISSN (Print)0277-786X

Keywords

  • METIS-247335
  • IR-96128

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  • Cite this

    Nieuwenhuis, A. F., van der Slot, P. J. M., Lee, C. J., Lindsay, I. D., Gross, P., & Boller, K. J. (2008). A CrTmHo:YAG laser pumped ZnGeP2 optical parametric oscillator for mid-infrared spectroscopy. In P. E. Powers (Ed.), Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VII (pp. 68751G-1-68751G-9). (68751G; Vol. 6875). San Jose, CA, USA: SPIE. https://doi.org/10.1117/12.763134