Werblinski Thomas, Lämmlein Bastian, Huber Franz J T, Zigan Lars, Will Stefan
Opt Lett. 2016 May 15;41(10):2322-5. doi: 10.1364/OL.41.002322.
Cavity-enhanced absorption spectroscopy is promising for many applications requiring a very high concentration sensitivity but often accompanied by low temporal resolution. In this Letter, we demonstrate a broadband cavity-enhanced absorption spectrometer capable of detection rates of up to 50 kHz, based on a spatially coherent supercontinuum (SC) light source and an in-house-built, high-speed near-infrared spectrograph. The SC spectrometer allows for the simultaneous quantitative detection of CO, CH, and HO within a spectral range from 1420 to 1570 nm. Using cavity mirrors with a specified reflectivity of R=98.0±0.3% a minimal spectrally averaged absorption coefficient of α=1·10 cm can be detected at a repetition rate of 50 kHz.
腔增强吸收光谱法对于许多需要非常高浓度灵敏度但往往伴随着低时间分辨率的应用来说很有前景。在本信函中，我们展示了一种宽带腔增强吸收光谱仪，它基于空间相干超连续谱（SC）光源和自行搭建的高速近红外光谱仪，能够实现高达50 kHz的检测速率。该超连续谱光谱仪允许在1420至1570 nm的光谱范围内同时对CO、CH和HO进行定量检测。使用反射率指定为R = 98.0±0.3%的腔镜，在50 kHz的重复频率下，可以检测到最小光谱平均吸收系数α = 1·10⁻⁶ cm⁻¹。
