Design And Research The Preparation Of 380nm-570nm Short-wave Pass Filter

Short-wave-pass cut-off filter is an important part of the optical system occupies in the military, digital imaging and optical holographic. Especially, the instrument of the filter in the fingerprint has great impact on the identification and criminal investigation.This paper describes cut-off filter in fingerprint instrument on the role and working principle describes the short-wave pass filter research purposes and significance. Fingerprint instrument to achieve the improvement of accuracy, we need a good corresponding membrane system design and manufacturing process to guarantee. In this paper, the basic principles of film, through the related theories, select a suitable membrane material, discussed in the current production conditions, conducted a short-wave pass filter coating design. Designed and manufactured to meet the monitoring of the wavelength is 650nm, in the 380-570nm band is a high AR in the 580-900nm-band high end of the filter.