Supercontinuum generation from 2 to 20  μm in GaAs pumped by picosecond CO₂ laser pulses

Abstract

We report on the generation of supercontinuum radiation from 2 to 20 μm in a 67 mm long GaAs crystal pumped by a train of 3 ps ${\mathrm{CO}}_2$ laser pulses. Temporal measurements indicate that sub-picosecond pulse splitting is involved in the production of such wide-bandwidth radiation in GaAs. The results show that the observed spectral broadening is heavily influenced by four-wave mixing and stimulated Raman scattering.

© 2014 Optical Society of America

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