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The recent development of quantum cascade (QC) lasers has opened up the availability of tunable laser sources for high-resolution absorption spectroscopy in the mid-infrared (IR). These lasers are fundamentally different than conventional mid-IR diode lasers and are expected to exhibit better noise characteristics. Initial characterizations of QC lasers developed at Bell Laboratories have demonstrated superior stability over lead salt lasers emitting in a similar spectral region.2 We report here the noise characteristics of several single-mode QC lasers operating in a continuous mode at liquid nitrogen temperatures.
© 2001 Optical Society of America
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