Nano-and microsecond laser pulse confinement in compensated gallium arsenide

Experimental data on the nano-and microsecond pulsed laser radiation (λ=1.315 μm) confinement in compensated GaAs are reported. There are three regions of confinement, which are controlled by radiation selfdefocusing due to single-photon absorption by deep impurity levels, self-defocusing due to two-photon absorption, and self-focusing caused by thermal dynamic lens formation.