Leindecker Nick, Marandi Alireza, Byer Robert L, Vodopyanov Konstantin L
EL Ginzton Laboratory, Stanford University, Stanford CA, 94305, USA.
Opt Express. 2011 Mar 28;19(7):6296-302. doi: 10.1364/OE.19.006296.
We present a new technique suitable for generating broadband phase- and frequency-locked frequency combs in the mid-infrared. Our source is based on a degenerate optical parametric oscillator (OPO) which rigorously both down-converts and augments the spectrum of a pump frequency comb provided by a commercial mode-locked near-IR laser. Low intracavity dispersion, combined with extensive cross-mixing of comb components, results in extremely broad instantaneous mid-IR bandwidths. We achieve an output power of 60 mW and 20 dB bandwidth extending from 2500 to 3800 nm. Among other applications, such a source is well-suited for coherent Fourier-transform spectroscopy in the absorption-rich mid-IR 'molecular fingerprint' region.
我们提出了一种适用于在中红外波段产生宽带锁相锁频频率梳的新技术。我们的光源基于简并光学参量振荡器（OPO），它能严格地对商用锁模近红外激光器提供的泵浦频率梳进行下转换并扩展其频谱。低腔内色散与梳状分量的广泛交叉混合相结合，可实现极宽的瞬时中红外带宽。我们实现了60 mW的输出功率以及从2500至3800 nm的20 dB带宽。在其他应用中，这样的光源非常适合在吸收丰富的中红外“分子指纹”区域进行相干傅里叶变换光谱分析。
