Abstract: A laser device comprises a first optical cavity comprising a first gain medium and a second optical cavity comprising a second gain medium. The first gain medium and the second gain medium generate light at respective different ranges of wavelengths. A synchronizer is optically coupled to both the first optical cavity and the second optical cavity and is configured to synchronize and mode-lock light from the first optical cavity and the second optical cavity. The laser device also includes a first optical filter and a second optical filter to filter the light from the first optical cavity and the second optical cavity respectively to output first filtered light pulses at a first predetermined range of wavelengths and second filtered light pulses at a second predetermined range of wavelengths.

Abstract: A laser device for outputting filtered light pulses for inducing coherent Raman scattering in a sample. The laser device comprises a first optical cavity comprising a first gain medium; and a second optical cavity comprising a second gain medium different to the first gain medium. The first gain medium and the second gain medium are each excitable by a pump light source to generate light at respective different ranges of wavelengths. A synchronizer is optically coupled to both the first optical cavity and the second optical cavity. The synchronizer is configured to synchronize and mode-lock light from the first optical cavity and the second optical cavity. The laser device also includes a first optical filter and a second optical filter.