ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels, Barcelona, Spain.
Opt Lett. 2009 Dec 15;34(24):3836-8. doi: 10.1364/OL.34.003836.
We report a compact and viable source of broadband, high-power, cw, mid-IR radiation based on a singly resonant optical parametric oscillator (SRO) pumped by a wide-bandwidth cw Yb fiber laser centered at 1060 nm. By exploiting the extended phase-matching bandwidth in a 50 mm crystal of MgO:PPLN and a ring SRO cavity, we obtain 5.3 W of broadband idler output for 25.5 W of pump at >80% depletion, transferring a pump bandwidth of 73.9 cm(-1) to an idler spectrum spread across an equal bandwidth centered at 3454 nm. By deploying output coupling of the signal, we generate 11.2 W of total power at 44% extraction efficiency with a pump depletion of >73% at the maximum available pump power. Measurements of transverse modal power confirm Gaussian distribution of signal and idler beams.
我们报道了一种基于单共振光参量振荡器（SRO）的紧凑且可行的宽带、高功率、连续波中红外（mid-IR）辐射源，该 SRO 由中心波长为 1060nm 的宽带连续波掺镱光纤激光器泵浦。通过利用 50mm 长 MgO:PPLN 晶体中的扩展相位匹配带宽和环形 SRO 腔，我们在 >80%的泵浦损耗下获得了 5.3W 的宽带闲频光输出，将 73.9cm(-1)的泵浦带宽转换为中心位于 3454nm 的等带宽闲频光谱。通过部署信号的输出耦合，我们在最大可用泵浦功率下，以 >73%的泵浦损耗实现了 11.2W 的总功率，提取效率为 44%。信号和闲频光束的横模功率测量证实了光束的高斯分布。
