Beam splitter based on aspheric lens
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摘要: 针对目前532 nm波长光的分束技术在光电测控系统（如激光干涉测速）等领域的广泛应用，提出一种光分束器的设计方法，此分束器可将光纤入射的532 nm绿光分成接近等比的多束光（包括一分二、一分三、一分四）。此系统首先用非球面透镜将光纤入射的光束准直，再通过分光片分光后用同样的透镜将光束耦合进光纤，达到了77%的通光效率，附加损耗约1 dB。详细介绍了非球面透镜的设计、分束器的结构、装配及其实验结果，并对实验结果以及研制过程中影响分束器效率的各种因素进行分析。Abstract: The technology of beam splitting for 532nm light is widely used in optoelectronic areas such as laser interferomertry for measuring velocities. This paper designed a beam splitter system, through which the 532nm input beam was splitted into identical beams (1 splitted into 2, 1 splitted into 3 and 1 splitted into 4). This system collimated the beam from the incident fiber by using an aspheric lens, and splitted the collimated beam into multiple beams by one or several beam splitter plates. Then, all the beams were coupled in the receiving fiber through lenses which were the same as the collimating lenses.The design of the aspheric lens, structure of beam splitter, assembly and test results were given, and the factors influencing the splitting efficiency were analyzed. Results show that the beam splitter system achieves a high output efficiency of about 77%, which means the additional loss is about 1dB.
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Keywords:
- optical design /
- beam splitter /
- equal optical path /
- aspheric lens
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