Abstract
The recent advent of quantum cascade lasers (QCLs)1,2 emitting in the mid- to long-wave infrared has greatly increased the availability of tunable lasers in this spectral region. Applications for such laser sources include high-resolution spectroscopy,3,4 optical communications and chemical sensing.5 While these have intrinsically low frequency noise compared to diode lasers due to their near-zero alpha parameter,1,6,7,8 a vast increase in their utility is obtained by frequency stabilizing them to a reference such as a molecular transition or a cavity resonance.9
© 2002 Optical Society of America
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