MODE-LOCKED LASER COMPRISING A DICHROIC PUMP MIRROR ADAPTED TO REFLECT THE LASER WAVELENGTHS OF A POLARIZED LIGHT AND TRANSMIT THE PUMP WAVELENGTH HAVING A DIFFERENT POLARIZATION

摘要

A mode-locked laser used for producing a laser beam (L) wherein the laser wavelengths (λr) overlaps the pump wavelength (λw) or is as close as about 20% of the pump wavelength (λw) or below. The mode-locked laser comprises a dichroic input pump mirror (DM1) which is coated with a dielectric coating (K) designed to transmit the P-polarized light at the pump wavelength (λw) and reflect the S-polarised light (r2) at the laser optical bandwidth (λr) wherein the group delay dispersion (GDD) of the reflected S-polarised light (r2) deviates below 100 fs2 for the laser wavelengths (λr).