17 January 2008 Generation of ultrashort mid-infrared pulses by super continuum seeded OPA in a MgO: LiNbO3 crystal
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A type I phase matching MgO:LiNbO3 optical parametric amplification (OPA) system were demonstrated. The OPA system was synchronously seeded with a super continuum and pumped by a laser pulse of 1Hz, 55fs, 3.5mJ, centered at 812nm. The super continuum was got by a sapphire plate and the MgO:LiNbO3 crystal which was 30mmx30mmx15mm in size. In order to avoid the three waves' temporal walk-off, pump wavelength and seeded signal wavelength were tuned simultaneously in simulation, and the result was that it can't be avoided in the collinear phase matching OPA. For the purpose of compensating the group velocity's mismatching, the non-collinear phase matching was adopted, then the non-collinear angles and the best amplified signal wavelengths which changing with the pump wavelengths were also optimized in numerical simulation for the non-collinear phase matching OPA. As a result, pulse energy of as much as 126uJ was achieved at wavelengths ranging from 3.2μm to 4.3μm.
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Ying Deng, Ying Deng, Qi-hua Zhu, Qi-hua Zhu, Xiao-ming Zeng, Xiao-ming Zeng, Ying Zhang, Ying Zhang, Xiao Wang, Xiao Wang, Feng-rui Wang, Feng-rui Wang, Xiao-jun Huang, Xiao-jun Huang, Xu-dong Xie, Xu-dong Xie, Yan-lei Zuo, Yan-lei Zuo, } "Generation of ultrashort mid-infrared pulses by super continuum seeded OPA in a MgO: LiNbO3 crystal", Proc. SPIE 6835, Infrared Materials, Devices, and Applications, 68350M (17 January 2008); doi: 10.1117/12.757558; https://doi.org/10.1117/12.757558

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