Department of Physics, Institute for Quantum Electronics, ETH-Zürich, 8093 Zürich, Switzerland.
ABB Switzerland Ltd., Corporate Research, Segelhofstrasse 1K, 5405 Baden-Daettwil, Switzerland.
Science. 2017 Jun 16;356(6343):1164-1168. doi: 10.1126/science.aam7424. Epub 2017 May 11.
Dual-comb spectroscopy offers the potential for high accuracy combined with fast data acquisition. Applications are often limited, however, by the complexity of optical comb systems. Here we present dual-comb spectroscopy of water vapor using a substantially simplified single-laser system. Very good spectroscopy measurements with fast sampling rates are achieved with a free-running dual-comb mode-locked semiconductor disk laser. The absolute stability of the optical comb modes is characterized both for free-running operation and with simple microwave stabilization. This approach drastically reduces the complexity for dual-comb spectroscopy. Band-gap engineering to tune the center wavelength from the ultraviolet to the mid-infrared could optimize frequency combs for specific gas targets, further enabling dual-comb spectroscopy for a wider range of industrial applications.
双梳光谱学结合了高准确度和快速数据采集的优势。然而，其光学梳系统的复杂性限制了它的应用。在这里，我们提出了一种使用简化的单激光系统的水蒸气双梳光谱学方法。采用自由运转的双梳锁模半导体盘片激光器，我们实现了具有快速采样率的非常好的光谱测量。通过简单的微波稳定，对自由运转和微波稳定两种模式下光梳的绝对稳定性进行了表征。这种方法大大降低了双梳光谱学的复杂性。通过能带工程可以将中心波长从紫外调谐到中红外，从而优化特定气体目标的频率梳，进一步为更广泛的工业应用提供双梳光谱学。
