Increased temperature acceptance bandwidth in frequency-doubling process using two different crystals
The temperature acceptance bandwidth of second-harmonic generation (SHG) can be dramatically improved by using two different kinds of nonlinear crystals with opposite signs of temperature derivation of phase mismatch. We study two SHG processes for the existing 1064 and 1550 nm high-average-power lasers. The numerical results show that the temperature acceptance bandwidth for SHG at 1064 nm can be three to five times larger than that of traditional single-crystal design, and it is also larger than that of using temperature-insensitive yttrium calcium oxyborate crystal. Importantly, the proposed design is applicable to various wavelengths, which suggests its potential in high-average-power SHG applications.
Ying Chen：Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education, College of Physics and Microelectronic Science, Hunan University, Changsha 410082, ChinaDepartment of Electronic and Communication, Changsha University, Changsha 410003, China
Guangcan Liu：Department of Electronic and Communication, Changsha University, Changsha 410003, China
备注：This work was partially supported by the National Natural Science Foundation of China (No. 61308005), the China Postdoctoral Science Foundation Funded Project (No. 2013M542106), the Hunan Postdoctoral Scientific Program (No. 2013RS4047), the Scientific Research Fund of Hunan Provincial Education Department (No. 14C0099), and the Science and Technology Program of Changsha (No. K1309012-11).
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