论文标题
带有240,000梳子模式的数据点的视频速率宽带长波IR双重轰炸光谱
Video-rate broadband longwave IR dual-comb spectroscopy with 240,000 comb-mode resolved data points
论文作者
论文摘要
我们报告了使用高度相干宽带（6.6-11.4 {\ m} M）长波长红外（LWIR）梳子的双重频率验光谱的分子检测。通过使用子三循环（20 fs）在ZGP晶体中的脉冲内差异频率（IDFG）通过模式锁定的Cr：ZnS激光器的中央波长为2.4 {\ m} m）产生梳子。已经证明了实时及以达到分子光谱的视频速率（0.1-12 s），以约80 MHz间隔的240,000个梳子模式分辨的数据点获得分子光谱，并参考了具有信号噪声比（SNR）> 300的RB时钟。达到如此高的大量光谱数据采集率的关键是LWIR梳子的低相位和强度噪声和出色的相互连贯性。高SNR还通过高（7.5％）IDFG转换效率促进，导致平均每通道LWIR梳子功率为300 MW。
We report molecular detection using dual frequency-comb spectroscopy with highly coherent broadband (6.6-11.4 {\m}m) long-wavelength infrared (LWIR) combs. The combs were produced via intra-pulse difference frequency generation (IDFG) in ZGP crystals using sub-three-cycle (20 fs) driving pulses from mode-locked Cr:ZnS lasers at the central wavelength of 2.4 {\m}m). Real-time and up to video rate (0.1-12 s per spectrum) acquisition of molecular spectra with some 240,000 comb-mode-resolved data points spaced by 80 MHz and referenced to a Rb clock with a signal-to-noise ratio (SNR) >300 has been demonstrated. The key to achieving such a high rate of massive spectral data acquisition is a low phase and intensity noise of the LWIR combs and excellent mutual coherence. The high SNR was also facilitated by the high (7.5%) IDFG conversion efficiency resulting in an average LWIR comb power of 300 mW per channel.
