The study of nanosecond pulsed diode laser driver

In order to obtain the nanosecond optical pulse with high power and high repetition frequency,a LD's driver which can produce pulse with nanosecond rise time is designed.The generator is based on the avalanche transistors in a Marx bank circuit.The selection of the avalanche transistors is also described in detail.This driver uses a transistor which has a low avalanche voltage to sharp the trigger pulse,and then use the pulse which is obtained from this transistor to trigger the Marx bank circuit.A large current narrow-pulse for driving the LD can be obtained.This driver can produce a large-amplitude nanosecond pulse and its peak current is up to 12.5A with pulse width of 1.51ns,pulse repetition frequency of 100kHz.It is consequenced that sharping the trigger pulse can reduce the avalanche voltage of the Marx bank circuit and narrow the width of the output pulse.It is more suitable for driving the LD.