Abstract

We have developed a $3.4\mu \text{m}$ spectrometer for sub-Doppler resolution molecular absorption spectroscopy. The source is based on the difference frequency generation using a $1.06\mu \text{m}$ Nd:YAG laser, a $1.55\mu \text{m}$ 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 $300\mu \text{W}$, a linewidth of less than 100 kHz, and a continuous tuning range over $10{\text{cm}}^{-1}$. The spectrometer allows us to observe six saturated absorption lines of ${}^{12}\text{C}{\text{H}}_4$ 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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