Picosecond nonlinear absorption and four-wave mixing in GaInAsP

Islam, M. N.; Ippen, E. P.; Burkhardt, E. G.; Bridges, T. J.
November 1985
Applied Physics Letters;11/15/1985, Vol. 47 Issue 10, p1042
Academic Journal
We report the first λ∼1.5 μm picosecond near-band-gap nonlinear absorption and degenerate four-wave mixing (DFWM) experiments in room-temperature GaInAsP using a mode-locked color center laser. The temporal, spectral, and pump energy dependences of the nonlinear signals are investigated. Nonlinear absorption cross sections σeh as large as -5.7×10-15 cm2 are obtained from the pump probe results, while effective nonlinear cross sections σeff as large as 7.8×10-16 cm2 (corresponding to a steady |χ(3)|∼3.8×10-3 esu for a 20-ns relaxation time) are measured in the DFWM experiments.


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