Abstract

In the last ten years more than 70 Raman-active crystals with Raman shifts ranging from 91 cm⁻¹ to 3150 cm⁻¹ have been investigated by our research group. The size of these discrete frequency shifts is material specific due to the energy of the participating optical phonon. Except the cascading generation of higher order Stokes and anti-Stokes Raman lines many of these materials demonstrate simultaneous interaction of several vibrational modes, self-frequency doubling or self-sum frequency mixing. Using a pump laser with an emission frequency stabilized on a reference frequency allows the extension of an existing frequency comb to one of the lines either generated only by SRS or by

© 2007 IEEE