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A compact, tunable mid-IR laser source is the most critical opto-electronic component in a spectroscopic molecular sensor. Until recently, the choice of such sources was limited to cryo-genically cooled Pb-salt diode lasers and low-power devices based on difference frequency generation (DFG). The development of quantum cascade (QC) lasers and especially single-frequency devices with distributed feedback (QC-DFB) provided an attractive new option for JR absorption spectroscopy. QC-DFB lasers operating at near-room temperature (i.e., temperature accessible with a thermoelectric module) are of particular interest for practical applications.
© 2002 Optical Society of America
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