Wideband spectral phase correlation is demonstrated from a multiwavelength mode-locked semiconductor laser. By use of frequency-resolved optical gating techniques, significant phase correlation was observed between multiple intracavity oscillating wavelengths, with wavelength separations of ~1 nm . The resultant temporal characteristics show a substantial modulation owing to the spectral coupling induced by intracavity-generated four-wave mixing. This result may lead to novel methods for directly generating ultrafast subpicosecond optical pulse sequences with spectrally tailored amplitude and phase characteristics from actively mode-locked semiconductor lasers.
© 1999 Optical Society of America
(140.4050) Lasers and laser optics : Mode-locked lasers
(140.5960) Lasers and laser optics : Semiconductor lasers
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(250.5980) Optoelectronics : Semiconductor optical amplifiers
(320.7120) Ultrafast optics : Ultrafast phenomena
H. Shi, I. Nitta, A. Schober, P. J. Delfyett, G. Alphonse, and J. Connolly, "Demonstration of phase correlation in multiwavelength mode-locked semiconductor diode lasers," Opt. Lett. 24, 238-240 (1999)