Collection Of theses on high power laser and plasma physics, 2016, 14 (1): 6100308, Published Online: May. 26, 2017  

Temperature-Insensitive Frequency Conversion by Electro-optic Effect Compensating for Phase Mismatch

Author Affiliations
1 Key Laboratory of High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
Abstract
A universal phase mismatch compensation method, which can be applied to temperature-insensitive frequency conversion, is experimentally demonstrated. In this method, two nonlinear crystals and an electro-optic crystal are cascaded. The generated phase mismatch in the nonlinear crystal can be well compensated for in the electro-optic crystal, thereby improving the stability of frequency conversion. In the proof-of-principle experiment, temperature-insensitive second and third harmonic generation (SHG and THG) are investigated by cascading KH2PO4 (KDP) and KD2PO4 (DKDP) crystals. The experimental results show that the temperature acceptance bandwidths of SHG and THG are 2.1 and 2.3 times larger, respectively, than that of the traditional method employing a single crystal. Meanwhile, the effectiveness of this method is also analyzed at a high power density, and a solution for the case of a nonuniform temperature is also discussed. Furthermore, angle-insensitive SHG is demonstrated to prove that this method can significantly reduce the influence of various unfavorable factors on frequency conversion. The demonstrated method may have potentially important applications in the nonlinear optical frequency conversion system.

Zijian Cui, Dean Liu, Aihua Yang, Jie Miao, Junyong Zhang, Jianqiang Zhu. Temperature-Insensitive Frequency Conversion by Electro-optic Effect Compensating for Phase Mismatch[J]. Collection Of theses on high power laser and plasma physics, 2016, 14(1): 6100308.

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