论文标题
相位稳定的混合双梳子光谱仪
A phase stable hybrid dual comb spectrometer
论文作者
论文摘要
双梳光谱（DCS）是一种提供高分辨率和快速数据采集的宽带技术。我们描述了一个混合双梳光谱仪，其中包括一个宽带商业光纤激光器系统，可提供广泛的样品询问，以及具有广泛可调且相对较窄光谱的积极锁定的锁定锁定的半导体激光器（MLL）。在两个梳之间已经实现了超过100秒的相互连贯性。我们采用了DCS系统来表征313 K处的Rubidium原子的吸收光谱，并具有较高的信号噪声比。宽带激光直接锁定在高技巧的腔体上，提供了长期的稳定性，而半导体激光器则锁定。为了表征DCS系统的绝对稳定性，测量了MLL梳子线的线宽，并显示系统完全锁定后从880 kHz降低到$ 17 $ kHz。长期稳定性的衡量为$ 5 \ times 10^{ - 12} $，$ 1 $ second和$ 5 \ times 10^{ - 14} $，$ 350 $秒。由于整体锁定，MLL的测得的计时抖动小了十倍。此外，我们已经解决了分散对锁定质量的影响，这对于宽带梳子激光器很重要。
Dual comb spectroscopy (DCS) is a broadband technique offering high resolution and fast data acquisition. We describe a hybrid dual comb spectrometer comprising a broadband commercial fiber laser system offering a wide range of sample interrogation, and an actively mode locked semiconductor laser (MLL) having a widely tunable, relatively narrow spectrum. The mutual coherence over 100 seconds has been realized between the two combs. We employed the DCS system to characterize the absorption spectrum of rubidium atoms at 313 K with a high signal to noise ratio. The broadband laser is directly locked on a high finesse cavity, providing long-term stability, while the semiconductor laser is locked to it. To characterize the absolute stability of the DCS system, the linewidth of the MLL comb line is measured and shown to reduce from 880 kHz to $17$ kHz when the system is fully locked. The long-term stability was measured to be $5 \times 10^{-12}$ at $1$ second and $5 \times 10^{-14}$ at $350$ seconds. The measured timing jitter of the MLL is ten times smaller due to the overall locking. In addition, we have addressed the effect of dispersion on the locking quality, which is significant for broadband comb lasers.
