The incident angle effect of symmetric periodic multilayer polarizing beam splitter

In order to study the effect of incident angles on the characteristics of symmetric periodic multilayer polarizing beam splitter (PBS),based on equivalent layers concept and stop-band theory,the bandwidth of spectrum and transmittance change with incident angles were analyzed with the graphical method.The transmittance spectrum of (LHL)^N PBS was measured with a UV3101-PC spectrometer.The experimental results show that the bandwidth spectrum becomes wider and then narrower with incident angles increase,so there is a maximum bandwidth.Taking the point corresponding to the maximum bandwidth as a reference point,the transmittance spectrum moves to longer-wave band and appears hollow aperture with the incident angle decreases;on the other hand,the transmittance spectrum moves to shorter-wave band with the incident angle increases.The experimental results are consistent with theoretical ones.The results provide an important reference for design and optimization of the symmetric periodic multilayer PBS.