Free-Carrier Grating Diffraction from Quantum Well Fabry-Perots
Final technical rept. Jul 96-Jul 97
PURDUE RESEARCH FOUNDATION LAFAYETTE IN
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This effort investigated the possibility of replacing the electroabsorption quantum wells with the strong absorption bleaching nonlinearities of high peak-power pulses. Free carrier absorption bleaching was investigated in GaAs epilayers and AlGaAsGaAs multiple quantum wells for excitation from above bandgap 10 ns pulses. Grating diffraction was also measured. The presence of thermal gratings, due to heating from the high-intensity pump pulse, contributed significantly to the observed diffraction. The lower than expected observed diffraction efficiency was attributed to a reduction in the internal writing efficiency due to the comparable sizes of the diffusion lengths and the grating space.
- Solid State Physics