Dielectric film transmission type spatial narrowband filter combined device
A narrow-band filter and dielectric thin film technology, applied in the direction of optical filters, optical components, optics, etc., can solve the problem of low transmission beam space and achieve the effect of good angular spectrum selection characteristics
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[0013] The present invention will be described below in conjunction with a specific example of a dielectric film transmission type spatial narrow-band filter combination device with a center wavelength of 1064 nm. But it should not limit the protection scope of the present invention.
[0014] see first figure 1 , figure 1 It is a schematic cross-sectional view of Embodiment 1 of the dielectric thin film transmission type spatial narrowband filter combination device of the present invention. It can be seen from the figure that the dielectric thin film transmission type spatial narrowband filter combination device of the present invention includes two long-wave pass-cut-off transmission filters with the same structure. Type filter, the cut-off angle of the filter is greater than 45 degrees, the angle between the two filters is greater than 90 degrees, and less than twice the cut-off angle.
[0015] The long-wave pass cut-off filter 4 placed at an inclination θ and the long-wav...
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