In order to improve the breakdown stability of gas switch in CO

2

laser

to improve the efficiency of trigger system

and to reduce the loss of trigger system

we developed a set of high-voltage pulse trigger generator（microsecond level） based on two-transistor forward topology. In the generator

high voltage pulses（the number is adjustable） with amplitude exceeding 38 kV and width of 10 μs was adopted to breakdown hyperbaric gas between electrodes of spark switch

dry-type high-voltage transformer was used as a booster unit

and the sampling and feedback control circuit that mainly consists of SG3525 and CD4098 was designed to monitor the situation of spark switch and control the frequency and number of output pulses. The experimental results show that breakdown probability of this pulse trigger generator is 99.7%

the efficiency

is 0.2

and the loss is 0.88 kW

when the PRF is 500 Hz. Compared to traditional trigger system

the breakdown probability of our design is increased by 2.7%

the efficiency is increased by 0.12

and the loss is reduced by 1.512 kW.