Abstract: A high repetition rate injection laser modulator wherein a DC bias voltage is applied across a serially connected forwardly-poled-injection laser and carrier-injected avalanche device. The carrier-injected avalanche device generates a current pulse in response to additional carriers injected into the device by a trigger pulse applied across the control junction of the avalanche device. An offset bias is provided across the control junction to remove built-up charges at the junction interface to provide for high repetition rate operation. The current pulse is of sufficient magnitude to effect pumping of the injection laser, the injection laser thus emitting a corresponding pulse of coherent light.