Abstract
In the present paper we have developed a Raman gain spectroscopy with femtosecond resolution. The advantage of the method is as follows. (1) The method is not suffered from disturbance by fluorescence. (2) The interference of signal with nonresonant background does not appear. This is extremely advantageous to the time-resolved CARS spectroscopy. We have applied this new method to the excitons in polydiacetylene (PDA) with only 1.5 ps lifetime. This offers the vibrational spectrum with the highest time resolution.
© 1994 Optical Society of America
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