A new type Lyot filter insensitive to incident angle

Abstract

The shifting direction of a central wavelength for a quartz birefringent filter is found different when the filter is rotated around the axis parallel and perpendicular to the quartz optical axis in this paper. Based on this result, a new type of two-stage modified-Lyot quartz filter is presented, which show that the central wavelength of this new type Lyot filter is actually insensitive to incident angle through theory analysis when incident angle is less than 18°, and the maximum transmission decrease only about 66% compared to normal incidence. Moreover, this conclusion is in good agreements with relative experiment results. © 2012 The Author(s).