Max-Planck-Institut für Quantenoptik, Garching, Germany.
Opt Lett. 2012 Feb 15;37(4):503-5. doi: 10.1364/OL.37.000503.
We present the first (to our best knowledge) femtosecond enhancement cavity in the visible wavelength range for ultraviolet frequency comb generation. The cavity is seeded at 518 nm by a frequency-doubled Yb fiber laser and operates at a peak intensity of 1.2×10(13) W/cm(2). High harmonics of up to the ninth order (~57 nm) are generated in an intracavity xenon gas jet. Intracavity high harmonic powers of several milliwatts for the third harmonic order and microwatts for the fifth harmonic order prove the potential of the "green cavity" as an efficient ultraviolet frequency comb source for future spectroscopic experiments. A limiting degradation effect of the cavity mirrors is avoided by operating at a constant oxygen background pressure.
我们提出了可见波长范围内用于紫外频梳产生的第一个（据我们所知）飞秒增强腔。该腔由倍频 Yb 光纤激光器在 518nm 处种子，并在 1.2×10(13) W/cm(2)的峰值强度下运行。在腔内氙气射流中产生了高达第九阶的高次谐波（约 57nm）。三阶高次谐波的腔内高次谐波功率可达几毫瓦，五阶高次谐波的功率可达微瓦，这证明了“绿光腔”作为未来光谱实验的高效紫外频梳源的潜力。通过在恒定的氧背景压力下运行，避免了腔镜的限制退化效应。
