Heiner Zsuzsanna, Petrov Valentin, Mero Mark
Opt Lett. 2020 Oct 15;45(20):5692-5695. doi: 10.1364/OL.403856.
We report on a microjoule-scale mid-infrared optical parametric amplifier (OPA) based on the recently developed wide-bandgap orthorhombic crystal, (BGS) and directly compare its performance to that of (LGS) in the same OPA setup. The source is based on a single OPA stage amplifying supercontinuum seed pulses with a quantum efficiency of 29% at an idler wavelength of 10 µm, featuring nominally carrier-envelope phase-stable pulses. As a result of pumping the OPA directly at 1 µm, the overall conversion efficiency far exceeds that of traditional schemes based on OPAs followed by difference frequency generation. Chirp compensation using bulk germanium resulted in 126 fs pulses covering the 7.6-11.5 µm spectral range. BGS holds great promise for power scaling due to its availability in larger single-crystal sizes than LGS.
我们报道了一种基于最近开发的宽带隙正交晶体（BGS）的微焦耳级中红外光学参量放大器（OPA），并在相同的OPA装置中直接将其性能与（LGS）的性能进行比较。该光源基于单个OPA级，放大超连续种子脉冲，在闲频波长为10 µm时量子效率为29%，具有标称的载波包络相位稳定脉冲。由于直接在1 µm波长泵浦OPA，其整体转换效率远远超过基于OPA后跟差频产生的传统方案。使用块状锗进行啁啾补偿产生了覆盖7.6 - 11.5 µm光谱范围的126 fs脉冲。由于BGS比LGS具有更大尺寸的单晶，因此在功率扩展方面具有很大的潜力。
