A birefringent filter for detecting faint laser signal under the sunlight background is presented. it consists of five Lyot elements. Every element is of the configuration of wide field of view. The filter device is characteristic of narrow bandwidth, wide field of view, and tunable transmission wavelength. The bandwidth is 0.19 nm, the transmission wavelength is 532.07 nm, and the wavelength is tunable with the half wave plate. The tunable range is 4 nm and the tuning fineness is 0.075 nm per degree. The free spectral range is 6.5 nm and the transmittance of the filter is 31.2%. Furthermore, the optimum design of combination of the Lyot elements is discussed. The influence of different constructional errors on the performance of the filter device is analyzed as well.
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