Abstract

An apparatus to probe picosecond photoinduced absorption in semiconductors between 2 and 5 μm with picosecond resolution is described. The IR source is based on difference frequency mixing an amplified picosecond dye laser pulse with a synchronized white light continuum pulse. The choice of liquid for continuum generation is discussed, and applications to transient absorption in germanium and trans-polyacetylene are presented.

© 1987 Optical Society of America

Tunable femtosecond radiation in the mid-infrared for time-resolved absorption in semiconductors

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