WALK-OFF EFFECT ON THE GENERATION OF ULTRASHORT PULSES FROM CW LIGHT USING CROSS-PHASE MODULATION IN OPTICAL FIBERS

7575075

Femtosecond dynamics of the optical Stark effect in semiconductor-doped glass

We report the observation of the optical Stark shift in CdSxSe1-x semiconductor-doped glass excited under nonresonant below gap condition and probed with femtosecond optical pulses. An ultrafast and pure light-induced shift of the bandedge is observed. The measured dependence of the band edge shift with the pump pulse peak intensity is linear for pump intensities up to 0.3 GW/cm(2) Above this value, departure from linearity is observed. For a pump intensity of 3 GW/cm(2), the band shifts by 11 meV. The response of the shift tracks the profile of the pumping pulse. (C) 1996 American Institute of Physics.6881093109

MODEL CALCULATION OF THE FEMTOSECOND CARRIER DYNAMICS IN AL0.48GA0.52AS

We present a model calculation capable of investigating the dynamics of photoexcited carriers in the Al0.48Ga0.52As indirect gap semiconductor. Nearly resonant excitation at the Gamma point produces low excess energy carriers, so that we use Boltzmann like equations and assume thermalized carrier distributions for each of the conduction valleys. Some aspects of the carrier dynamics are discussed and pump and probe measurements are compared to the calculated saturation bleaching, evidencing a very good agreement between theory and experiment. We obtain a value of 3.5 eV/Angstrom A for the D-Gamma X deformation potential.7663749375

SPECTRAL NARROWING IN THE PROPAGATION OF CHIRPED PULSES IN SINGLE-MODE FIBERS

A theoretical study of the nonlinear propagation of picosecond chirped pulses in single-mode fibers is presented. We show that, under appropriate conditions, spectral narrowing-rather than broadening, as is generally believed-is induced, owing to the interplay of self-phase-modulation and dispersion. For downchirped pulses at a wavelength of 0.9 mum and a peak power as low as 0.1 W, substantial spectral narrowing occurs.18969970

SIDEBAND INTERACTIONS IN HOMOGENEOUSLY BROADENED SATURABLE ABSORBERS

2952716272

POSITIVE AND NEGATIVE CHIRPING OF LASER-PULSES SHORTER THAN 100 FSEC IN A SATURABLE ABSORBER

11422422

Size effects on the phonon spectra of quantum dots in CdTe-doped glasses

We studied the confinement effects on the phonon Spectra of CdTe quantum dots by means of resonant Raman scattering measurements. The spectra show clearly longitudinal optical phonons, surface phonons and some of their overtone combinations. We show that the scattering due to surface phonons increases as the quantum dot size decreases. The results are obtained by tuning the laser excitation energy to resonance for quantum dots of different sizes inside the broad size distribution in CdTe-doped glasses. (C) 1996 American Institute of Physics.69335735

INCREASING THE EFFICIENCY OF CO2 TRANSVERSE ELECTRIC ATMOSPHERIC LASERS BY USE OF LOW IONIZATION-POTENTIAL ADDITIVES

52261261

PUMP POWER AND SATURABLE ABSORBER EFFECT ON A COLLIDING PULSE-MODELOCKED DYE-LASER EMITTING PULSES WITH 47 FS

57213313