Ramaiah-Badarla V, Kumar S Chaitanya, Ebrahim-Zadeh M
Opt Lett. 2014 May 1;39(9):2739-42. doi: 10.1364/OL.39.002739.
We report a simple, compact, picosecond, dual-wavelength optical parametric oscillator (DW-OPO) at 160 MHz, based on two MgO:PPLN crystals sharing the same cavity and synchronously pumped by an Yb-fiber laser at 1064 nm. The two signal and idler wavelength pairs are independently tunable in the near- and mid-infrared across 1550-1615 nm and 3118-3393 nm, respectively, and can be arbitrarily tuned, even to degeneracy and beyond, without coherent coupling, irrespective of operating wavelength. The DW-OPO provides two signal and idler pulse trains and delivers as much as 1.5 W of average signal power at a degenerate wavelength of 1550 nm from each arm, at a total (signal plus idler) power extraction efficiency of as much as 44%. The two output signal pulse trains have durations of ∼18 ps and ∼15.2 ps, with Gaussian spatial quality, and exhibit passive power stability, better than 3.6% rms over >5 h. We also demonstrate the possibility of tailoring the pulse trains from the DW-OPO by controlling the delay between the pump pulses at the input to the two MgO:PPLN crystals.
我们报道了一种简单、紧凑的皮秒级双波长光学参量振荡器（DW-OPO），其重复频率为160 MHz，基于两块共享同一谐振腔并由1064 nm的Yb光纤激光器同步泵浦的MgO:PPLN晶体。这两对信号光和闲频光波长分别在近红外和中红外波段独立可调，范围分别为1550 - 1615 nm和3118 - 3393 nm，并且可以任意调谐，甚至达到简并及以上，无需相干耦合，与工作波长无关。该DW-OPO提供两列信号光和闲频光脉冲串，在简并波长1550 nm时，每臂可输出高达1.5 W的平均信号功率，总（信号光加闲频光）功率提取效率高达44%。两列输出信号光脉冲串的脉宽分别约为18 ps和15.2 ps，具有高斯空间质量，并且呈现出无源功率稳定性，在超过5小时的时间内均方根误差优于3.6%。我们还展示了通过控制输入到两块MgO:PPLN晶体的泵浦脉冲之间的延迟来调整DW-OPO脉冲串的可能性。
