We present a simple method for fully stabilized mid-infrared optical frequency comb generation based on single-pass femtosecond optical parametric generation that is seeded by a continuous-wave laser. We have implemented the method in a periodically poled lithium niobate crystal that produces a frequency comb tunable across 3325 nm–4000 nm (2380 cm⁻¹–3030 cm⁻¹). The method generates the mid-infrared (idler) comb with known and stabilized Carrier-Envelope Offset (CEO) frequency without the need to directly detect it. The idler CEO is continuously tunable for almost half of the repetition rate and can be modulated. Together with the high output power (up to 700 mW) and low intensity noise (0.018% integrated in 10 Hz–2 MHz bandwidth), this makes the demonstrated mid-infrared frequency comb promising for many applications such as high-precision molecular spectroscopy, frequency metrology, and high harmonic generation.

中文翻译：

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具有动态偏移频率调谐的中红外光学频率梳生成的简单方法

我们提出了一种简单的方法，该方法基于由连续波激光器播种的单次飞秒光学参数生成，可以完全稳定地实现中红外光学频率梳的生成。我们在周期性极化的铌酸锂晶体中实现了该方法，该晶体产生的频率梳可在3325 nm–4000 nm（2380 cm ^-1 –3030 cm ^-1）。该方法可产生具有已知且稳定的载波包络偏移（CEO）频率的中红外（惰轮）梳，而无需直接检测到它。惰轮CEO可以连续调节几乎达到重复率的一半，并且可以对其进行调制。加上高输出功率（高达700 mW）和低强度噪声（在10 Hz至2 MHz带宽中集成了0.018％的噪声），这使得已证明的中红外频率梳对于许多应用（如高精度分子光谱，频率计量和高次谐波产生。