Frequency-modulation spectroscopy with a pulsed dye laser

We report the use of frequency-modulation spectroscopy with a Nd dye laser of 5-nsec pulse duration. In spite of the fact that the dye laser is not transform limited and has 30% peak-to-peak intensity fluctuations, we are easily able to measure absorptions as small as 2%. © 1982, Optical Society of America.