Grating Layer Dispersion Apparatus for Spectrometer Light Efficiency
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Solution Overview
Problem
Conventional color dispersion gratings have complex structures, are difficult to process, and result in low light efficiency due to limitations in light dispersion.
Innovation Solution
A dispersion apparatus comprising an optical substrate with a grating layer and a light outlet layer, where the grating layer disperses incident light into first-order diffracted beams with target wavelengths, and the light outlet layer extracts these beams, with a diffraction angle smaller than the total reflection angle, allowing for improved light energy utilization and processing simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional holographic gratings or fiber Bragg gratings are used to realize color dispersion, then color dispersion can be achieved, but the structure becomes complicated and processing becomes difficult
Solution Approach 1:
The device segments the color dispersion function into two independent components: a grating layer for diffraction and an optical waveguide layer for light guidance. This segmentation allows each component to be optimized independently, simplifying the manufacturing process while maintaining effective color dispersion functionality.
2Loss of energy
If conventional glass optical waveguides are used to realize light dispersion, then light dispersion can be achieved, but light efficiency is limited
Solution Approach 1:
The patent changes the material parameter of the optical waveguide from conventional glass to a material with higher refractive index difference (such as silicon-based materials). This parameter change enables stronger total internal reflection, significantly improving light confinement and light efficiency while maintaining effective light dispersion capability.
3Measurement precision
If the diffraction angle is increased to improve wavelength separation, then color resolution improves, but light loss increases due to exceeding total reflection angle
Solution Approach 1:
The patent ensures continuous light guidance by designing the diffraction angle to always remain within the total internal reflection angle of the optical waveguide. This allows the diffracted light to continuously propagate through the waveguide without escaping, maintaining both wavelength separation resolution and light efficiency throughout the entire light path.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves higher light energy utilization and simplifies processing, enabling effective color dispersion and spectrometer applications with improved resolution and signal-to-noise ratio.
Implementation Method 1
The grating layer is configured to perform dispersion of incident light into first-order diffracted beams having target wavelengths and transmit the first-order diffracted beams into the optical substrate
Implementation Method 2
a diffraction angle of each of the first-order diffracted beams having the target wavelengths is smaller than a total reflection angle between the optical substrate and air
Data Source
AI summary
The present disclosure relates to a dispersion apparatus. The dispersion apparatus may include an optical substrate; a grating layer on a first side of the optical substrate; and a light outlet layer on a second side of the optical substrate, the second side opposite the first side of the optical substrate. The grating layer is configured to perform dispersion of incident light into first-order diffracted beams having target wavelengths and transmit the first-order diffracted beams into the optical substrate, and wherein a diffraction angle of each of the first-order diffracted beams having the target wavelengths is smaller than a total reflection angle between the optical substrate and air. The light outlet layer is configured to extract the first-order diffracted beams having the target wavelengths in the optical substrate.