Infrared band-pass filter
A band-pass filter and filter technology, which is applied in the direction of instruments, optical filters, optics, etc., can solve the problems of unrecognizable, large shift of passband center wavelength, identification failure, etc., and achieve the effect of improving the analysis ability
Active Publication Date: 2020-02-21
PLATINUM OPTICS TECH
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Problems solved by technology
The infrared bandpass filter has a passband in the wavelength range of 800nm and 1100nm. When the incident angle changes from 0 degrees to 30 degrees, the center wavelength of the passband shifts between 31nm and 34nm. When the angle changes The central wavelength of the passband shifts greatly, which leads to the problem that the infrared bandpass filter is applied to the 3D imaging system and cannot be recognized or fails to recognize when receiving light at a large angle
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[0032] A number of implementations of the present invention will be disclosed below, and for the sake of clarity, many practical details will be described together in the following description. It should be understood, however, that these practical details should not be used to limit the invention. That is, in some embodiments of the invention, these practical details are not necessary.
[0033] The terms "first", "second" and the like used herein do not specifically refer to a sequence or order, nor are they used to limit the present invention, but are only used to distinguish components or operations described with the same technical terms. .
[0034] see figure 1 , which is a schematic diagram of the infrared bandpass filter of the first embodiment of the present invention; as shown in the figure, this embodiment provides an infrared bandpass filter 1 applied to a three-dimensional imaging system, and the infrared bandpass filter 1 has a first A multi-layer film structur...
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Abstract
The invention relates to an infrared band-pass filter. The infrared band-pass filter is provided with a first multilayer film structure; the first multilayer film structure comprises a plurality of Si:NH layers and a plurality of low-refractive-index layers; the refractive index of the Si:NH layers in the wavelength range of 800 nm to 1100 nm is larger than 3.5; the extinction coefficient of the Si:NH layers is smaller than 0.0002; the plurality of low-refractive-index layers and the plurality of Si:NH layers are stacked alternately; the refractive index of the low-refractive-index layers is smaller than 3 in the wavelength range of 800 nm to 1100 nm; the difference value of the refractive index of the Si:NH layers and the refractive index of the low-refractive-index layers is greater than0.5. The infrared band-pass filter has passbands within the wavelength range of 800 nm and 1100 nm; and when an incident angle is changed from 0 degree to 30 degrees, the offset amplitude of the central wavelength of the passbands is smaller than 12 nm. The infrared band-pass filter of the invention can improve three-dimensional image analysis capacity when applied to a three-dimensional imagingsystem.
Description
technical field [0001] The invention relates to the technical field of optical filtering, in particular to an infrared bandpass filter. Background technique [0002] At present, the infrared bandpass filter is to form a multi-layer film structure on one surface of the optical substrate, and a multi-layer anti-reflection layer on the other surface. The multi-layer film structure interacts through multiple high refractive index layers and multiple low refractive index layers. Deposited, the material of the general high refractive index layer is Ti 3 o 5 、 Ta 2 o 5 , ZrO 2 , Nb 2 o 5 and TiO 2 One of them, generally the material of the low refractive index layer is MgF 2 and SiO 2 one of. The infrared bandpass filter has a passband in the wavelength range of 800nm and 1100nm. When the incident angle changes from 0 degrees to 30 degrees, the shift of the central wavelength of the passband is between 31nm and 34nm. When the angle changes The central wavelength shift ...
Claims
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IPC IPC(8): G02B5/20
CPCG02B5/208G02B5/281G02B5/285G02B13/143G02B1/04G01N21/35G01N29/42G02B5/288G02B13/14G02B1/115
Inventor 穆正堂苏佑敬
Owner PLATINUM OPTICS TECH