Title Performance investigation of high-efficiency widely tunable subnanosecond optical parametric generator and amplifier based on MgO:PPLN /
Authors Banys, Jonas ; Savickytė, Justina ; Balachninaitė, Ona ; Armalytė, Simona ; Tamulienė, Viktorija ; Jarutis, Vygandas ; Vengelis, Julius
DOI 10.1364/OE.459826
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Is Part of Optics express.. Washington : Optical Society of America. 2022, vol. 30, no. 13, p. 23163-23176.. ISSN 1094-4087
Keywords [eng] Subnanosecond pulses ; optical parametric generators and amplifiers ; MgO:PPLN crystal
Abstract [eng] We report on experimental and theoretical studies of widely tunable high-efficiency subnanosecond optical parametric generator (OPG) and amplifier (OPA) based on a 2 cm long multigrating MgO-doped periodically-poled lithium niobate (MgO:PPLN) crystal pumped by a passively Q-switched Nd:YAG micro-laser. Our OPG can be continuously tuned from 1442 nm to 4040 nm with signal wave energies ranging from 33 𝜇J to 265 𝜇J and total OPG conversion efficiency up to 46 % that depended on the pump focusing conditions. Characterization of spatial properties of the OPG determine Lorentzian spatial profile of the signal beam with 𝑀2≈2 that was also dependent on the pump focusing conditions. High OPG gain and subsequent pump depletion led to the adjustment of the output signal pulse duration in the range of 242 – 405 ps by varying the incident pump power. By using a distributed feedback (DFB) continuous-wave (CW) 1550 nm wavelength seed laser for the OPA operation we reduced the generation threshold up to 1.6 times, increased maximum conversion efficiency by 4 – 20%, and achieved nearly transform-limited output signal pulses. Experimentally measured characteristics were supplemented by numerical simulations based on the quantum mechanical model for the OPG, and classical three-wave interaction model for the OPA operation.
Published Washington : Optical Society of America
Type Journal article
Language English
Publication date 2022