The spectrai and temporal nature of the recombinant radiation from a GaAs photoconductive switch is described. A simultaneous measurement of the electrical avalanche pulse and associated temporal luminescence peak is utilized to extract a propagation velocity for the filamentary tip of approximately 5 x i08 cm/s. The measured spectral content of the filaments in a bulk structure is presented for various bias voltages and compared to a theoretical model for band-toband recombination considering temperature, carrier density, and self-absorption effects.
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