Lilienfein N, Hofer C, Holzberger S, Matzer C, Zimmermann P, Trubetskov M, Pervak V, Pupeza I
Opt Lett. 2017 Jan 15;42(2):271-274. doi: 10.1364/OL.42.000271.
We address the challenge of increasing the bandwidth of high-finesse femtosecond enhancement cavities and demonstrate a broad spectrum spanning 1800 cm (195 nm) at -10 dB around a central wavelength of 1050 nm in an EC with an average finesse exceeding 300. This will benefit a host of spectroscopic applications, including transient absorption spectroscopy, direct frequency comb spectroscopy, and Raman spectroscopy. The pulse circulating in the EC is composed of only 5.4 optical cycles, at a kilowatt-level average power. Together with a suitable gating technique, this paves the way to the efficient generation of multi-megahertz-repetition-rate isolated extreme ultraviolet attosecond pulses via intracavity high-order harmonic generation.
我们应对了提高高精细度飞秒增强腔带宽的挑战，并在平均精细度超过300的增强腔中，于中心波长1050纳米附近实现了在-10分贝时跨越1800厘米（195纳米）的宽光谱。这将惠及众多光谱应用，包括瞬态吸收光谱、直接频率梳光谱和拉曼光谱。在增强腔中循环的脉冲仅由5.4个光学周期组成，平均功率达到千瓦级。再结合合适的选通技术，这为通过腔内高次谐波产生高效生成多兆赫兹重复率的孤立极紫外阿秒脉冲铺平了道路。
