Opt Lett. 2018 Apr 1;43(7):1507-1510. doi: 10.1364/OL.43.001507.
We report a high-repetition-rate femtosecond optical parametric oscillator (OPO) for the deep-infrared (deep-IR) based on type-I critical phase-matching in CdSiP (CSP), pumped directly by a Ti:sapphire laser. Using angle-tuning in the CSP crystal, the OPO can be continuously tuned across 7306-8329 nm (1201-1369 cm) in the deep-IR. It delivers up to 18 mW of idler average power at 7306 nm and >7 mW beyond 8000 nm at 80.5 MHz repetition rate, with the spectra exhibiting bandwidths of >150 nm across the tuning range. Moreover, the signal is tunable across 1128-1150 nm in the near-infrared, providing up to 35 mW of average power in ∼266 fs pulses at 1150 nm. Both beams exhibit single-peak Gaussian distribution in TEM spatial profile. With an equivalent spectral brightness of ∼5.6×10photons s mm sr0.1% BW, this OPO represents a viable alternative to synchrotron and supercontinuum sources for deep-IR applications in spectroscopy, metrology, and medical diagnostics.
我们报告了一种基于 I 型临界相位匹配的高重复率飞秒光参量振荡器（OPO），用于基于 CdSiP（CSP）的深红外（深红外），由钛宝石激光器直接泵浦。通过在 CSP 晶体中进行角度调谐，OPO 可以在深红外范围内连续调谐 7306-8329nm（1201-1369cm）。它在 7306nm 处提供高达 18mW 的闲频平均功率，在 80.5MHz 重复率下超过 8000nm 时提供超过 7mW 的功率，光谱在调谐范围内显示出 >150nm 的带宽。此外，信号在近红外可调谐到 1128-1150nm，在 1150nm 处提供高达 35mW 的平均功率，脉冲宽度为 ∼266fs。两束光在 TEM 空间分布中均呈现单峰高斯分布。该 OPO 的等效光谱亮度约为 5.6×10photons s mm sr0.1% BW，是深红外光谱学、计量学和医学诊断应用中替代同步辐射和超连续源的可行选择。
