Abstract

We have developed a 3.4μm spectrometer for sub-Doppler resolution molecular absorption spectroscopy. The source is based on the difference frequency generation using a 1.06μm Nd:YAG laser, a 1.55μm distributed-feedback laser diode, and a ridge waveguide periodically poled lithium niobate with a conversion efficiency of 9%/W. The generated radiation has a power level of about 300μW, a linewidth of less than 100 kHz, and a continuous tuning range over 10cm1. The spectrometer allows us to observe six saturated absorption lines of C12H4 with 0.3–0.4 MHz width and 1.3%–1.7% depth relative to the corresponding linear absorption lines.

© 2009 Optical Society of America

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