Abstract
We have developed a spectrometer for sub-Doppler resolution molecular absorption spectroscopy. The source is based on the difference frequency generation using a Nd:YAG laser, a 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 , a linewidth of less than 100 kHz, and a continuous tuning range over . The spectrometer allows us to observe six saturated absorption lines of 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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