We describe the extension of excitation correlation to the mid-infrared. This technique provides a convenient alternative to more complicated pump-probe and time-resolved photoluminescence approaches ...for investigating electron–hole recombination in semiconductors. Excitation correlation is used to determine the Shockley–Read–Hall and Auger coefficients for a GaInSb/InAs multiple quantum sample with an absorption edge near 3.6 μm. The results are
A
=
0.20
±
0.02
ns
−
1
,
C
=
4.0
±
0.4
×
1
0
−
27
cm
6
/
s
, and
n
tr
=
8.5
±
0.2
×
10
16
cm
−
3
, where
n
tr
is a saturation density for Shockley–Read–Hall recombination and also an estimate for the density of mid-gap trap levels.
