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A concave volume holographic grating

A volume holographic grating and holographic grating technology, applied in the field of spectral imaging, can solve the problems of drift, color blurring of the central wavelength, etc., and achieve the effect of avoiding the widening of the full width at half maximum, reducing the angle requirements, and avoiding the occurrence of offset.

Active Publication Date: 2017-09-05
INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a concave volume holographic grating to solve the serious color blur and central wavelength drift of the traditional volume holographic grating when facing the incident light with a large divergence angle

Method used

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  • A concave volume holographic grating
  • A concave volume holographic grating
  • A concave volume holographic grating

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Embodiment

[0024] A concave volume holographic grating described in this embodiment includes a grating 1. The grating 1 is a volume holographic grating. The upper surface of the volume holographic grating is provided with a concave surface 2. The incident light is incident from the upper surface, that is, the incident light first passes through the concave surface 2. The concave surface 2 of this embodiment can be a hemispherical surface, or an arc-shaped groove structure, specifically as figure 1 As shown, the arc-shaped groove is arranged on the top of the grating 1 and runs through the top of the grating 1 transversely. Slitting the grating 1, you can get the curve after the slitting of the concave surface 2, such as figure 2 As shown, the curve part in the figure is obtained by longitudinal cutting of the groove, the x-axis is the coordinate axis tangent to the lowest point of the curve, that is, the lowest point of the concave surface, and the y-axis is the coordinate axis perpendi...

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Abstract

The invention discloses a concave volume holographic grating which comprises a volume holographic grating body. The front surface of the volume holographic grating body is provided with an arc groove; and a curve obtained through rip cutting of the arc groove meets the following condition: (n-1)arctan f'(x)-arctan((x-a) / (f(x)-b))+arctan(a / b)=0, wherein the x axis is a coordinate axis tangent with the lowest point of the curve, the y axis is a coordinate axis perpendicular to the bottom surface of the grating, the f(x) represents a curve equation, the f'(x) is a first-order derivative of the f(x), the n is grating medium refractive index, and the a and b are the horizontal coordinate and vertical coordinate of a light source respectively. Through the structure above, angle requirement for incident rays can be reduced, the step of parallel light processing is saved, and complexity degree of the device is reduced.

Description

technical field [0001] The invention relates to the field of spectral imaging, in particular to a concave holographic grating. Background technique [0002] The front surface of the traditional volume holographic grating is flat. Since the incident light has a certain divergence angle, the incident angles of different angular spectrum components of the incident light are different. According to the characteristics of the volume holographic grating, the central wavelength of diffracted light corresponding to different incident angles is different. , which will not only shift the filtering center wavelength of the volume holographic grating, widen the FWHM of the filtering curve, but also cause more serious color blurring of the image plane. The traditional method usually uses a beam changing system that strictly matches the volume grating, and strictly limits the field of view to less than 0.1°. Such a beam changing system is difficult to design and manufacture, expensive, bu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/18
CPCG02B5/1866G02B2005/1804
Inventor 段佳著赵祥杰张大勇骆永全沈志学王海峰
Owner INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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