Fiber-laser-pumped high-repetition-rate picosecond optical parametric generation and amplification in MgO:PPLN.
Fiber-laser-pumped high-repetition-rate picosecond optical parametric generation and amplification in MgO:PPLN.
复制标题
MgO:PPLN 中的光纤激光泵浦高重复率皮秒光学参数生成和放大。
DOI：
10.1364/ol.403699
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发表时间：
2020
期刊：
影响因子：
3.6
通讯作者：
M. Ebrahim
中科院分区：
文献类型：
--
作者：
B. Nandy;S. C. Kumar;M. Ebrahim
据我们所知，我们首次报道了在MgO：PPLN中使用单程光学参量产生（OPG）和放大（OPA）在近红外以高平均功率产生可调谐高重复率皮秒脉冲，并具有记录转换效率。通过部署锁模Yb光纤激光器在1064 nm提供21 ps的泵浦脉冲在80 MHz，和级联的两个50 mm长的MgO：PPLN晶体，我们产生高达8.3 W的总平均输出功率在59%的转换效率在513 nm的可调谐范围内，跨越1902-2415 nm，与记录阈值低至600 mW（7.5 nJ）。两级OPG-OPA方案提供对精细波长调谐和输出光谱带宽的控制，通过独立控制每个晶体中的相位匹配来实现。OPG-OPA输出具有高空间光束质量和出色的无源功率和中心波长稳定性，在1小时内分别优于0.9% rms和0.1% rms。在2107 nm波长处，输出脉冲宽度为11 ps，10 dB带宽为350 nm。
We report the generation of tunable high-repetition-rate picosecond pulses in the near-infrared at high average power with record conversion efficiency using single-pass optical parametric generation (OPG) and amplification (OPA) in MgO:PPLN, for the first time, to the best of our knowledge. By deploying a mode-locked Yb-fiber laser at 1064 nm providing 21 ps pump pulses at 80 MHz, and a cascade of two 50-mm-long MgO:PPLN crystals, we generate up to 8.3 W of total average output power at a conversion efficiency of 59% over a tunable range of 513 nm, across 1902-2415 nm, with a record threshold as low as 600 mW (7.5 nJ). The two-stage OPG-OPA scheme provides control over fine wavelength tuning and output spectral bandwidths, enabled by the independent control of phase-matching in each crystal. The OPG-OPA output exhibits high spatial beam quality and excellent passive power and central wavelength stability better than 0.9% rms and 0.1% rms, respectively, over 1 hour. The output pulses have a duration of ∼11ps, with a 10 dB bandwidth of ∼350nm at 2107 nm.