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arXiv 2007.13573physics.optics
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基于BaGa4S7的高效亚4周期1 μ m泵浦10 μm光参量放大器

Efficient, sub-4-cycle, 1-μm-pumped optical parametric amplifier at 10 μm based on BaGa4S7

Zsuzsanna Heiner, Valentin Petrov, Mark Mero

摘要:

报道了一种基于宽带隙正交晶系晶体BaGa 4S 7(BGS)的μ J级中红外光参量放大器(OPA),并将其性能与LiGa S2(LGS)在相同的OPA装置中的性能进行了直接比较。该光源基于单OPA级放大超连续谱种子脉冲,在10 μm闲频波长处量子效率为29%,具有名义上载波包络相位稳定的脉冲特性。由于直接在1 μm处泵浦OPA,总转换效率远远超过了基于OPA然后产生差频的传统方案。利用体锗进行啁啾补偿,得到了126 fs的脉冲,覆盖了7.6-11.5 μm的光谱范围。由于BGS比LGS具有更大的单晶尺寸,因此BGS在功率缩放方面具有很大的潜力。

英文摘要:

We report on a μJ-scale mid-infrared optical parametric amplifier (OPA) based on the recently developed wide-bandgap orthorhombic crystal, BaGa4S7 (BGS), and directly compare its performance to that of LiGaS2 (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 OPA's 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.

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