Growth of high quality non-linear optical crystal zinc germanium phosphide for Mid-infrared optical parametric oscillator |
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| Authors: | S X Xia C H Yang G Li G Li Zhu B Q Yao Z T Lei |
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| Institution: | 1. School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, China
2. National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin, 150001, China
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| Abstract: | ZnGeP2 single crystals were grown from Vertical Bridgman method. High-quality near-stoichiometric ZnGeP2 single crystals were obtained in the diameter of 30 mm and length of 120 mm. The results showed that after thermal annealing of the crystals the optical absorption coefficient was below 0.03 cm?1 at 2.05 μm, and ～0.02 cm?1 at 3–8 μm. The low absorption loss ZnGeP2 samples with dimension of 6 × 6 × 18 mm3 were cut from the annealed ingots for 3–5 μm optical parametric oscillation (OPO) experiments. For OPO experiment, we obtained up to 8.7 W output in the 3–5 μm wavelength range (with signal of 3.80 μm and idler of 4.45 μm, respectively) pumped by a 16.3 W 2.05 μm Tm,Ho:GdVO4 laser at pulse repetition rate of 10 kHz, which corresponded to a conversion efficiency of 53.4% and slope efficiency of 64.8%, respectively. |
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