Study On Characteristics Of Diode-Pumped Solid-State Doubly Passive Q-Switched Laster

It is known that ns level, symmetrical wave shape laser output may be achieved by LD end-pumped doubly passively Q-switched laser. It has advantages such as simple structure, high stability and good operability. So the cost of the laser can be reduced and the miniaturization of the laser can be realizable. All-solid-state laser has been widely used in remote sensing, communication and military project.The main contents in this thesis is summerized as below:1.The rate equations of Cr4+:YAG passively Q-switched laser, GaAs passively Q-switched laser and Cr4+:YAG-GaAs doubly passively Q-switched laser were put forward. The equations were uniformized and the operation process of the laser was analyzed.2.The slope efficiency and thermal effect were compared between directly-pumped laser and indirectly-pumped laser. It brought theoretical basis for the choice of pump source.3.The uniformized rate equations were solved by numerical method. The output characteristics(pulse width, repetition frequency and peak power) of Cr4+:YAG passively Q-switched laser and Cr4+:YAG-GaAs doubly passively Q-switched laser were simulated when the small signal transmission ratios changed.4.The output characteristics of Cr4+:YAG passively Q-switched laser were measured and compared to theoretical values. The theoretical simulation was verified.