High-peak-power, high-efficiency, widely tunable sub-nanosecond optical parametric generator based on PPMgLN

Hongzhan Qiao; Kai Zhong; Fangjie Li; Xianzhong Zhang; Sijia Wang; Yizhe Wang; Quan Sheng; Wei Shi; Degang Xu; Jianquan Yao

doi:10.1117/12.2599194

9 October 2021 High-peak-power, high-efficiency, widely tunable sub-nanosecond optical parametric generator based on PPMgLN

Hongzhan Qiao, Kai Zhong, Fangjie Li, Xianzhong Zhang, Sijia Wang, Yizhe Wang, Quan Sheng, Wei Shi, Degang Xu, Jianquan Yao

Author Affiliations +

Proceedings Volume 11905, Quantum and Nonlinear Optics VIII; 119050R (2021) https://doi.org/10.1117/12.2599194
Event: SPIE/COS Photonics Asia, 2021, Nantong, JS, China

Conference Poster

Abstract

A high-efficiency, high-peak-power, widely tunable optical parametric generator (OPG) based on a MgO-doped periodically poled lithium niobate (PPMgLN) crystal is reported. Pumped by a microchip passively Q-switched laser (duration: 330 ps, repetition rate:1 kHz) with the power output of 880 mW, the OPG could be continuously tuned from 1399 nm to 4443 nm by changing the grating period and working temperature. The OPG generated an output power of 591 mW for the signal (1758 nm) and the idler (2695 nm) waves, achieving the internal conversion efficiency of 67.16%, slope efficiency of 89.6% and peak power above 1 MW at 1758 nm. The evolution of linewidth of the signal wave during wavelength tuning were also studied and the theoretical models were proposed. The linewidth was narrowed from 100 GHz to GHz level using a continuous-wave (CW) tunable seeder. The linewidth reached 1.72 GHz at 1626 nm, close to the Fourier transform limit of the sub-nanosecond signal wave.

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Hongzhan Qiao, Kai Zhong, Fangjie Li, Xianzhong Zhang, Sijia Wang, Yizhe Wang, Quan Sheng, Wei Shi, Degang Xu, and Jianquan Yao "High-peak-power, high-efficiency, widely tunable sub-nanosecond optical parametric generator based on PPMgLN", Proc. SPIE 11905, Quantum and Nonlinear Optics VIII, 119050R (9 October 2021); https://doi.org/10.1117/12.2599194

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