Optical filling of delay-inducing traps in injection lasers

Irradiating a GaAs
0.60
P
0.40
laser with radiation from a GaAs laser demonstrates conclusively that the delay-inducing traps are deep centers which act as saturable absorbers. These centers can be filled optically and then remain in the nonabsorbing state for milliseconds. Their concentration is greater than
1 \times 10^{17}
cm
^-3
.