High repetition rate mid-infrared generation with singly resonant optical parametric oscillator using multi-grating periodically poled MgO:LiNbO3 |
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Authors: | Nimish Dixit Rouchin Mahendra O.P. Naraniya A.N. Kaul A.K. Gupta |
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Affiliation: | Instruments Research & Development Establishment, Dehradun 248 008, Uttarakhand, India |
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Abstract: | A high repetition rate mid-infrared singly resonant optical parametric oscillator (OPO) using MgO-doped multi-grating periodically poled LiNbO3 (MgO:PPLN) is demonstrated. A 1064 nm Q-switched Nd:YVO4 laser at 10 kHz repetition rate and pulse width of 17.8 ns was used to pump the OPO. The period of the quasi-phase matched (QPM) grating in the multi-grating MgO:PPLN chip varied from 25.5 to 31.5 μm in steps of 0.5 μm. This corresponds to the generation of a signal beam from 1.37 to 1.64 μm and an idler beam from 3.0 to 4.8 μm, respectively. A maximum signal power of 250 mW and idler power of 140 mW has been obtained with an input pump beam of power 1.92 W, for a grating period of 30.5 μm. A maximum optic-optic conversion efficiency of 20% and 7.4% in the idler has been observed. It has been observed that the output power increases as the period of the grating increases. |
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Keywords: | Optical parametric oscillator MgO:PPLN Parametric generation |
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