Experimental and theoretical studies of angular resolved uv photoemission from singlecrystal surfaces of copper

The observation of stochastic resonance in a semiconductor distributed feedback laser is reported. Bistable modal and intensity operation is obtained using the degenerate modes of the grating. Through an observation of longitudinal-mode switching under current modulation, an enhancement in the signal-to-noise ratio of the laser’s output wavelength switching of 22 dB is measured.

No abstract

We report the first demonstration of an optically controlled absorption modulator based on state filling in a periodically doped InxGa1−xAs/GaAs multiple quantum well structure. Differential absorption of approximately 104 cm−1 is observed in the quantum wells of our test structure at saturation pump powers. Photoluminescence and time-resolved modulation measurements confirm the predicted behavior of carrier recombination and give a measure of enhanced carrier lifetime of approximately 1 ms. These initial results show the potential for developing these structures into optically addressed spatial light modulators.