INTRACAVITY SPECTRAL SHAPING IN EXTERNAL-CAVITY MODE-LOCKED SEMICONDUCTOR DIODE-LASERS

Intracavity spectral shaping techniques have been employed to artifici ally shape and broaden the optical spectrum of external cavity mode-lo cked semiconductor lasers, Using an intracavity spectrometer and inten sity Fourier-plane filtering, active mode-locked output spectra with a multiplicity of independently tunable wavelengths have been generated , while an adjustable intracavity etalon has been employed to generate an 18-nm spectral width, Furthermore, hybrid mode-locking with a mult iple-quantum-well (MQW) saturable absorber combined with the intracavi ty etalon, followed by dispersion compensation has led to the generati on of optical pulses of 330 fs in duration.