Study on Controllable Passively Q-switched Lasers

Q-switched pulsed laser(CPQL) is a new type of pulsed laser,which has both the excellences of passively Q-switched laser and actively Q-switched laser.The laser is composite of a passively Q-switched laser with a saturable absorber placed in its cavity and a controlling LD with a focus system which is used to control the bleach degree of the absorber.The characteristics of CPQL's output,including the pulse energy,pulse width,the moment of pulse generation and repetition frequency,could be controlled through controlling LD.The principles of CPQL and experiment results are present in this paper.Comparing to passively Qswitched lasers and actively Q-switched lasers,CPQL have higher performance and will find important applications in many fields.