Achromatic method based on three-time exposure technology
An achromatic, sub-exposure technology, applied in the field of multi-spectral imaging, can solve the problems of high cost, time-consuming, and extremely high manufacturing process requirements
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[0041] The achromatic method based on the triple exposure technology disclosed in this embodiment,
[0042] The principle of achromatic aberration is as figure 1 As shown, the colored light emitted from the microdisplay passes through the collimating lens and then irradiates the coupling input grating. Through the modulation of the grating, the RGB three-color light waves are reflected in the same direction and enter the optical waveguide. At the coupling output grating, the light wave is modulated and reflected, and enters the human eye, so that the human eye can see a color image. The key issue is how to make the coupling input and output grating to achieve the desired effect. When two beams of plane waves are used to make a holographic grating by interference, the period of the grating, the angle between the two beams and the wavelength satisfy the formula
[0043] 2 Λ sin θ rec 2 ...
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