The authors show that the optical properties of selectively oxidized vertical cavity lasers with a depleted optical thyristor structure have a low threshold current and high sensitivity to input optical light. The oxidized thyristor laser clearly shows a nonlinear s-shaped current-voltage and lasing characteristics. A switching voltage of 5.24V, a holding voltage of 1.50V, and a very low threshold current of 0.65mA are measured, making these devices attractive for optical processing applications.