激光二极管双端抽运声光调Q高重复频率Nd:GdVO4激光器

激光二极管(LD)抽运的固体激光器(DPSSL)的调Q器件是获得高重复频率、高峰值功率的有效手段之一,随着激光雷达、激光加工业的发展,要求调Q器件向着更高重复频率的方向发展。Nd∶GdVO4以其优异的物理和激光特性,使得它在激光二极管端面抽运固体激光器的声-光(A-O)调Q器件中,即使在很高的调制重复频率下,仍可获得窄脉宽、高峰值功率的脉冲激光输出。理论分析了影响脉冲激光的输出能量和脉宽大小的决定因素,研究了脉宽、平均输出功率及峰值功率随调Q重复频率的变化关系。利用双激光二极管双端抽运Nd∶GdVO4晶体棒,实现了声-光调Q高重复频率窄脉宽1063 nm激光输出。在晶体入射端面总抽运功率约43 W条件下,当重复频率f=10 kHz时,获得脉宽Δt=10.2 ns,单脉冲能量E=0.95 mJ,峰值功率PM=93.1 kW的输出;在重复频率f=100 kHz时,获得Δt=28.1 ns,E=0.10 mJ,PM=3.6 kW的结果。

Laser Diode Double-End-Pumped Acousto-Optically Q-Switched Nd: GdVO4 Laser with High Repetition Rate

Laser diode (LD) pumped Q-switched solid-state lasers (SSLs) can achieve high repetition rates and high peak power. With the development of lidar and laser machining, diode-pumped SSLs (DPSSLs) with higher repetition rates are required. In the LD-end-pumped acousto-optically (A-O) Q-switched solid state lasers, Nd:GdVO4, which has excellent physical and laser properties, is able to obtain a laser output of short pulse width even at very high repetition rates. The major factors that have influence on pulse energy and pulse width are analyzed, pulse width, average output power and peak power as a function of the repetition rates have been studied. Double Nd:GdVO4 crystals laser end-pumped by double LD is reported, and A-O Q-switched laser of 1063 nm with high repetition rate and short width is achieved. At the total pump power of 43 W, pulse width of 10.2 ns, pulse energy of 0.95 mJ and peak power of 93.1 kW are obtained at the repetition rate of 10 kHz; 28.1 ns, 0.10 mJ and 3.6 kW are produced respectively at 100 kHz.