高重复频率的增益开关Nd3+:YVO4+KTP绿光激光器

为了设计一种可连续和脉冲双模式输出的绿光激光器,采用一只半导体激光器端面抽运Nd3+:YVO4+KTP胶合晶体,通过腔内倍频,获得光-光转换效率为19%的连续绿光激光输出.利用增益开关技术,改变注入激光器的电脉冲波形,可得到方波、正弦波或三角波的绿光激光脉冲输出;调节激光器驱动电流的幅度和占空比可改变输出激光脉冲的强度和脉宽;改变驱动电源的重复频率可以使输出绿光激光脉冲的重复频率连续可调,最大重复频率可达2MHz.在重复频率为560kHz时,获得了输出绿光激光脉冲宽度为74ns、峰值功率为285mW、振幅噪声小于%.研究表明,利用增益开关技术可以获得重复频率和窄脉冲宽度的绿光激光脉冲.

Gain-switched Nd3+ ∶YVO4+ KTP green laser at high repetition rate

A compact green laser,which can emit continuous wave or laser pulse trains respectively,was reported. Withutilizing a laser diode end-pump Nd3+ ∶ YVO4 + KTP gluing crystal,19% optical-optical conversion efficiency was achieved in continuous output. Adjusting the waveform of the laser power supply to gain-switch the laser diode,the corresponding output waveform of square,sine,or triangle green laser pulses were obtained. The intensity and pulsewidth of the laser pulses could be varied with the amplitude and duty circle of the injecting current pulses. Meanwhile,by changing the injecting current pulses repetition rates,the laser pulse trains repetition rates could be tuned from 0.5Hz to as high as 2MHz. A green laser pulse train,with 74ns pulsewidth,285mW peak power and amplitude noise less than 3%,was obtained at 560kHz. The research showed that green laser pulse of high repetition rates and narrow pulsewidth could be obtained by gain-switched technique.