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摘要: 为满足大功率激光发射的要求，提出研制一种基于卡塞格林系统的大口径激光发射的复合式无遮拦激光扩束器，消除卡塞格林系统中心遮拦，提高激光发射效率。依据卡塞格林系统原理及其结构特征，结合伽利略折射式扩束器的特点，设计一种发射口径为550 mm的复合式无遮拦激光扩束器，采用反射式扩束器和折射式扩束器结合的方式，在卡塞格林次镜中心开通孔，使中心被遮拦激光透过。后接伽利略式折射扩束器，对中心透过光束进行扩束，两光束共轴发射。对设计的新型复合扩束器进行激光透过率实验，实验结果表明，对于波长10.6 μm激光，透过率大于95.21%，比传统卡塞格林扩束器提高22.12%。Abstract: In order to meet the requirements of high-power laser emission, a large-diameter composite laser beam expander without central obscuration based on Cassegrain system is proposed to eliminate the central obscuration of the Cassegrain system and improve the laser emission efficiency. Based on the principle of the Cassegrain system and its structural characteristics, combined with the characteristics of the Galileo refraction type beam expander, a composite laser beam expander without central obscuration with an emission aperture of 550 mm is designed. Using a combination of a reflective beam expander and a refractive beam expander, a through hole is opened in the center of the Cassegrain secondary mirror so that the center is passed through the obscured laser. The rear side is connected to a Galileo-type refracting beam expander, which expands the beam transmitted through the center, and the two beams are emitted coaxially. The laser transmittance test is carried out on a new type of composite beam expander. The experimental results show that for the laser of 10.6 μm wavelength, the transmittance is more than 95.21%, which is 22.12% higher than that of the traditional Cassegrain beam expander.
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Key words:
- emission efficiency /
- laser beam expander /
- Cassegrain
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表 1 反射扩束镜片尺寸参数(单位:mm)
Table 1. Lens parameters of reflective beam expander(Unit:mm)
主镜 次镜 直径 620 150 通光口径 600 140 中心孔径 140 37 近轴曲率半径 1 500 300 材料 Zerodur Si 
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表 2 折射扩束镜片参数
Table 2. Lens parameters of refractive beam expander
序号 注释 曲面类型 半径/mm 厚度/mm 材料 模式 通光口径/mm 1(STO) Sphere 223.8 12 ZNSE_SPECIAL Refract 140 2 Sphere 500 200.65 Refract 140 3 Sphere -118.3 10 ZNSE_SPECIAL Refract 36 4 Sphere 627.5 50 Refract 36 IMAGE Sphere INFINITY 0 9 756.037
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表 3 能量测量结果(单位:J)
Table 3. Result of enegy measurement(Unit:J)
测量次数 无遮拦W2 有遮拦W1 激光器出口能量W 1 7.0 5.6 21.8 2 7.1 5.2 20.9 3 6.6 5.9 21.3 4 6.9 5.0 21.5 5 7.2 4.9 20.8 6 7.0 5.5 21.7
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