Abstract

The IR absorption of p-type germanium ~10 μm is due to transitions from the heavy to light hole band.¹ Strong bleaching of the absorption has been found after excitation with nanosecond pulses from CO₂ lasers.² Nanosecond measurements give only limited information on the mechanisms underlying the observed absorption changes, since carrier-carrier and carrier- phonon scattering occur on a time scale much faster than 1 ns.

© 1990 Optical Society of America