采用激光二极管(LD)端面抽运, Nd:YAG/Cr4+:YAG热键合被动调Q, 在风冷的情况下, 对激光脉冲重复频率、脉冲宽度、峰值功率、脉冲能量及其相互关系进行了理论分析和实验研究。获得了200 kHz, 8 ns, 单脉冲能量50 μJ输出, 峰值功率高达6.25 kW。结果表明, 理论分析和实验结果一致, 此种激光器是重复频率高, 脉宽窄, 峰值功率高的全固态激光器。
2021-08-06 16:02:09
2.16MB
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A passively Q-switched side-pumped laser with folded resonator is specially constructed for singlelongitudinal-mode smooth pulse output. Nd:YAG is chosen as the laser active medium and Cr<sup>4+</sup>:YAG as the saturable absorber medium. Additionally, the method of frequency selection by grating with 1200 line/mm and Fabry-Perot (F-P) etalon is used in the twisted-mode cavity. The single-frequency smooth pulses are produced with 10-Hz repetition rate, 20-ns pulse width, and 1.064-\m
2021-02-26 11:04:31
866KB
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采用射频磁控溅射和热退火处理技术制备SiNx/Si/SiNx多层薄膜，测试了纳米硅晶粒平均尺寸、光学带隙和薄膜对1064 nm激光的非线性吸收系数。建立SiNx/Si/SiNx多层薄膜被动调Q的Nd:YVO4双波长激光器速率方程，得到双波长调Q脉冲的数值模拟结果。在激光二极管(LD)端面抽运的三镜复合腔Nd:YVO4激光器中，SiNx/Si/SiNx多层薄膜作为可饱和吸收体同时实现了双波长激光被动调Q，获得20 ns的1064 nm激光脉冲和19 ns的1342 nm激光脉冲输出。研究表明，薄膜对1064 nm和对1342 nm的双光子饱和吸收是双波长激光被动调Q的直接原因；激光器两个支腔输出损耗的差别和薄膜对两个波长的非线性吸收系数的相对值影响了双波长脉冲的宽度和时间间隔。
2021-02-09 09:06:47
1.87MB
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