A six-octave optical frequency comb from a scalable few-cycle erbium fibre laser
A six-octave optical frequency comb from a scalable few-cycle erbium fibre laser
复制标题
一种可扩展的少周期铒光纤激光器的六倍频程光频梳
DOI：
10.1038/s41566-021-00778-y
复制
发表时间：
2021-03-11
期刊：
影响因子：
35
通讯作者：
Diddams, Scott A.
中科院分区：
文献类型：
--
作者：
Lesko, Daniel M. B.;Timmers, Henry;Diddams, Scott A.
覆盖从紫外线到红外线的相干、紧凑和稳定的光源对于外差超分辨率成像 (1)、宽带红外显微镜 (2)、蛋白质结构测定 (3) 和远距离痕量气体检测 (4) 来说是理想的选择。为了解决这些苛刻的问题，频率梳 (5) 将绝对频率精度与亚飞秒定时和波形控制相结合，以实现高分辨率、高速和宽带光谱 (6-9)。在这里，我们展示了来自稳健且低噪声铒光纤（Er:fibre）技术的可扩展的近单周期脉冲源。我们生成的峰值功率为 0.56 MW，跨越六个八度音阶，从紫外线 (350 nm) 到中红外线 (22,500 nm)，在 0.86 PHz 带宽内实现 10(10) 的分辨率。 LiNbO3、GaSe 和 CdSiP2 中的二阶非线性提供相位稳定的红外超短脉冲，同时亮度超过同步加速器 (10)，而 LiNbO3 中的级联非线性同时产生四个倍频程 (0.350-5.6 μ m)。我们预计这些进步将有助于基础和应用光谱学、显微镜和相敏非线性光学的发展。
A coherent, compact and robust light source with coverage from the ultraviolet to the infrared is desirable for heterodyne super-resolution imaging(1), broadband infrared microscopy(2), protein structure determination(3) and standoff trace-gas detection(4). To address these demanding problems, frequency combs(5) combine absolute frequency accuracy with sub-femtosecond timing and waveform control to enable high-resolution, high-speed and broadband spectroscopy(6-9). Here we demonstrate a scalable source of near-single-cycle pulses from robust and low-noise erbium fibre (Er:fibre) technology. With a peak power of 0.56 MW we generate a comb spanning six octaves, from the ultraviolet (350 nm) to the mid-infrared (22,500 nm), achieving a resolving power of 10(10) across 0.86 PHz of bandwidth. Second-order nonlinearities in LiNbO3, GaSe and CdSiP2 provide phase-stable infrared ultra-short pulses with simultaneous brightness exceeding a synchrotron(10), while cascaded nonlinearities in LiNbO3 yield four octaves simultaneously (0.350-5.6 mu m). We anticipate that these advances will be enabling for basic and applied spectroscopy, microscopy and phase-sensitive nonlinear optics.