Beam splitter based on aspheric lens

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.