Coupled-cavity mode locking of a KCl:Tl laser using an erbium-doped optical fiber

An erbium-doped monomode fiber that exhibits enhanced optical nonlinearity has been incorporated into a coupled-cavity mode-locked (CCM) KCl:Tl laser, from which stable, sub-100-fsec pulses have been produced near 1.5 microm. Spectral measurements of the CCM laser output also indicate the existence of a self-frequency shift that can provide pulse generation in two distinct wavelength regimes.