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Proceedings Paper

Generation of watt level mid-infrared wavelengths using intra-cavity ZnGeP2 OPO within a 2.1µm Ho:YAG laser
Author(s): L. H. Tan; P. B. Phua
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Paper Abstract

We report on watt level mid-infrared (MIR) wavelength generation using intra-cavity ZnGeP2 (ZGP) optical parametrical oscillator (OPO) within a 2.1μm Ho:YAG laser. A compact cavity of less than 50cm was designed for the intra-cavity OPO setup. With the same laser setup, watt level of both 2.1μm and MIR wavelengths were generated. An average output power of >20W of 2.1μm and >1W of MIR wavelength at 10 KHz repetition rate were achieved from a 46W Tm fiber pump laser. The Ho:YAG laser was resonantly pumped by a 1.9μm Tm:fiber laser and nanosecond pulses were generated using an electro-optics q-switch modulator. With the use of a λ/4 waveplate and a thin film polarizer, a variable output coupler for the Ho:YAG laser was formed where we could optimize the output coupling to achieve 21W of 2.1μm wavelength. MIR wavelengths were generated using commercial ZGP crystals from Inrad. A HR mirror for the MIR wavelengths was inserted into the Ho:YAG cavity to form the intra-cavity ZGP OPO. The rear mirror of the Ho:YAG cavity act as the output coupler with R=70% for the MIR wavelengths. Optimizing of the MIR generation was done by tuning the phase-matching angle of the ZGP and adjusting the cavity length of the OPO. A preliminary result of the intra-cavity ZGP OPO generates >1W of MIR wavelength.

Paper Details

Date Published: 21 February 2011
PDF: 6 pages
Proc. SPIE 7917, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications X, 79170O (21 February 2011); doi: 10.1117/12.876248
Show Author Affiliations
L. H. Tan, DSO National Labs. (Singapore)
Nanyang Technological Univ. (Singapore)
P. B. Phua, DSO National Labs. (Singapore)
Nanyang Technological Univ. (Singapore)

Published in SPIE Proceedings Vol. 7917:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications X
Konstantin L. Vodopyanov, Editor(s)

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