Method for designing three-blazing-surface echelle grating capable of broadening detection spectrum range
A technology of echelle grating and detection spectrum, applied in the field of echelle grating, can solve the problem of narrow detection of diffraction energy spectral range, etc., and achieve the effect of broadening the spectral range and strong spectral intensity
Inactive Publication Date: 2018-04-06
UNIV OF SHANGHAI FOR SCI & TECH
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[0005] The present invention aims at the problem that there is only one blazed surface in each groove of the traditional echelle grating, and the narrow spectral range of diffraction energy is not conducive to detection, and proposes a design method of a three-blazed echelle grating that can broaden the detection spectral range , broaden the spectral range on the detection surface
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[0015] like figure 1 The schematic diagram of the three-blazed échelle grating is shown, and the specific design steps of the three-blazed échelle grating are as follows:
[0016] a. In the echelle grating groove, design three blaze surfaces with different blaze angles, blaze surface 1 is in the middle, blaze surface 2 and blaze surface 3 are on both sides of blaze surface 1, and the blaze angle of blaze surface 1 is θ b1 , the blaze angle of blaze surface 2 is θ b2 , the blaze angle of blaze surface 3 is θ b3 , and the blazed surface decreases in turn from the grating base along the clockwise or counterclockwise direction after the design, θ b3 b1 b2 .
[0017] b. According to the grating equation d(sinα+sinβ)=mλ b , for the same beam of parallel incident light A, B, C, incident perpendicular to the blazing surface 1, blazing surface 1 meets the Littrow self-collimated incident condition, and the principal maximum direction of diffraction of blazing surface 1 is the direc...
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The invention relates to a method for designing a three-blazing-surface echelle grating capable of broadening the detection spectrum range. Three blazing surfaces with different blazing angles are designed in the same notch groove of an echelle grating to form an echelle grating with three blazing surfaces, and the difference between the blazing angles of adjacent blazing surfaces enables the diffraction energy superposition peaks to be equal. The widths of the three blazing surfaces are designed based on the condition that the optical energy of the three blazing wavelengths on the image surface is the same. As the main directions of the diffraction main poles of the blazing surfaces correspond to different diffraction wavelengths, strong spectral intensity can be achieved in a wide spectrum range on the image surface. The spectral energy distribution of the echelle grating broadens along the wavelength. Therefore, strong spectral intensity is achieved in a wide spectrum range, the spectrum range on the detection surface is broadened, and wavelength information which cannot be detected by a single-blazing-surface echelle grating spectrograph at the spectral energy edge of the imagesurface can be detected.
Description
technical field [0001] The invention relates to an echelle grating, in particular to a design method of a three-blazed echelle grating capable of widening the detection spectrum range. Background technique [0002] Grating is a very important spectroscopic element with a wide range of applications. It has a wide range of applications in scientific fields such as spectrometers, optical communication technology, and optical detection technology. The grating replaces the prism as the dispersion element of the new generation spectrometer because of its high dispersion accuracy, high resolution and high diffraction efficiency. Spectral instruments are playing an increasingly important role in geology, water quality, and biomedicine. At the same time, they are also widely used in high-tech fields such as aerospace and astronomy. At the same time, with the rapid development of modern aerospace, astronomy and other fields, gratings and related Grating instruments have become an ind...
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Inventor 黄元申史俊盛斌张翔王冬王良玉陈惠康刘安琦彭丽娜
Owner UNIV OF SHANGHAI FOR SCI & TECH