Abstract
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 , , and within a spectral range from 1420 to 1570 nm. Using cavity mirrors with a specified reflectivity of a minimal spectrally averaged absorption coefficient of can be detected at a repetition rate of 50 kHz.
© 2016 Optical Society of America
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