A control apparatus for a pumped rod-type laser includes an arc lamp disposed to illuminate the lasing medium, such as a NdYAG crystalline rod. The apparatus includes a full wave rectifier to power the arc lamp, and a MOSFET switching circuit to turn on and off the arc lamp power at controlled times...http://www.google.com.au/patents/US4950268?utm_source=gb-gplus-sharePatent US4950268 - Laser driver and control circuit
