This study experimentally investigated a Yb: YAG pulse laser amplifier with a high amplification gain and a high signal-to-noise ratio (SNR). The highest amplification gain of 172 and highest pulse energy of 131 mJ were obtained with the highest SNR of 24.9 dB from a volume gain of 10 mm × 10 mm × 1 mm. The output beam quality values of M²_x = 1.91 in the slow axis and M²_y =1.58 in the fast axis were also achieved.

利用激光二极管(LD)阵列端面抽运Nd:YVO4板条晶体, 结合稳定非稳混合腔, 实现了高功率、高效率、高光束质量的1064 nm和1342 nm激光输出。板条Nd:YVO4晶体掺杂原子数分数为0.3%, 尺寸12 mm×10 mm×1 mm, a轴切割, c轴平行于12 mm方向。采用稳定正支共焦非稳腔, 在抽运功率为265 W时, 得到了123 W的1064 nm连续激光输出, 光光转换效率和斜效率分别为46.4%和52.4%; 在输出功率约为100 W时测得稳腔和非稳腔两个方向的M2因子均为1.3, 输出功率不稳定性小于1%。采用稳定负支共焦非稳腔, 在抽运功率为139.5 W时, 得到35.4 W的1342 nm激光输出, 光光转换效率为25.4%, 在稳腔方向光束质量为M2=1.23; 在非稳腔方向光束质量为M2=1.14。

报道了采用激光二极管(LD)阵列部分端面抽运Nd:YVO4板条声光(AO)调Q激光输出特性。实验中采用了平-凹稳定谐振腔,输入镜曲率半径500 mm,输出透射率为T=35%,腔长为L=110 mm。Nd:YVO4板条晶体尺寸为12 mm×10 mm×1 mm,a轴切割,c轴平行于12 mm方向,掺杂浓度为0.3%。在抽运功率为104 W,重复频率为40 kHz时,得到最高平均输出功率为40 W,单脉冲能量为1 mJ,脉宽为42.2 ns,光-光转换效率为38.4%;在重复频率为20 kHz时,得到最高平均输出功率为33.3 W,单脉冲能量为1.66 mJ,最短脉宽为21.1 ns。

In this paper, we have investigated some parameters of a radio frequency (RF) excited diffusively cooled all-metal slab waveguide CO2 laser based on the modified Rigrod theory by introducing a waveguide coupling efficiency which designates the coupling between the waveguide and the resonator mirrors. The parameters of the laser small signal gain g0, saturation intensity Is, and waveguide coupling efficiency (\eta) are studied theoretically and experimentally. In the experiments, three sets of output coupling flat mirrors with the different transitivities were used, and a maximum laser power output of 150 W was obtained from a gas discharge region of 2-mm height, 20-mm width, and 386-mm length coupled with a CASE-I optical waveguide resonator.

In this paper, a new type of radio frequency (RF) excited diffusively cooled all-metal slab waveguide CO2 laser is presented, in which the waveguide channel is constructed by two aluminum side walls and two aluminum electrodes, the discharge is confined in the slab waveguide channel in terms of the voltage division structure. From this type of structure, 127-W laser power is obtained.