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Proceedings Paper

Mid-infrared tunable optical parametric oscillator pumped by a Q-switched Tm,Ho:YAG ceramic laser
Author(s): Hisanao Hazama; Masaki Yumoto; Takayo Ogawa; Satoshi Wada; Kunio Awazu
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Paper Abstract

Since resonant absorption of light caused by a variety of different molecular bond occurs in the mid-infrared (MIR) wavelength region, many applications using tunable MIR lasers have been reported. However, the applicable fields of the MIR tunable lasers have been restricted by their large size and high cost equipments. Therefore, we are developing a compact tunable MIR laser using an optical parametric oscillator (OPO). To obtain a long term stability and a high conversion efficiency, a diode-pumped and Q-switched Tm,Ho:YAG ceramic laser with a wavelength of 2.1 μm was adopted for the pump source. A maximum output energy of 40 mJ was obtained with the Tm,Ho:YAG ceramic laser at a pulse width of 150 ns and a repetition rate of 10 Hz. An experiment was performed using a singly-resonant OPO with a ZnGeP2 crystal pumped by another OPO with a wavelength of 2.1 μm. A threshold pump fluence of 0.2 J/cm2 and a slope efficiency of 60% were obtained at a signal and idler wavelengths of 3.3 and 5.6 μm, respectively. Using these results and a theoretical model calculation, the maximum output energy of MIR-OPO pumped with the Tm,Ho:YAG ceramic laser was estimated to be about 20 mJ.

Paper Details

Date Published: 23 February 2009
PDF: 7 pages
Proc. SPIE 7197, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VIII, 71970J (23 February 2009); doi: 10.1117/12.809832
Show Author Affiliations
Hisanao Hazama, Osaka Univ. (Japan)
Masaki Yumoto, Tokyo Univ. of Science (Japan)
The Institute of Physical and Chemical Research (RIKEN) (Japan)
Takayo Ogawa, The Institute of Physical and Chemical Research (RIKEN) (Japan)
Satoshi Wada, Tokyo Univ. of Science (Japan)
The Institute of Physical and Chemical Research (RIKEN) (Japan)
Kunio Awazu, Osaka Univ. (Japan)


Published in SPIE Proceedings Vol. 7197:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VIII
Peter E. Powers, Editor(s)

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