A kind of multiplexing volume holographic grating
A volume holographic grating and grating technology, applied to diffraction gratings, instruments, etc., can solve the problems of loss, large energy difference of the three primary colors, and inability to reach the coupling grating at the same time, and achieve the effect of uniform output energy and narrow bandwidth.
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[0030] Attached below figure 2 Attached Figure 5 The present invention will be further described with the specific embodiments.
[0031] The diffraction efficiency of volume holographic gratings is related to many factors, including average refractive index, refractive index modulation, incident angle, grating tilt angle, incident light polarization characteristics, and so on. Considering the influence of incident angle and grating tilt angle on the diffraction angle, in order to avoid the difference of in-coupling grating diffracted light angle, the out-coupling position is difficult to be unified, the grating tilt angle corresponding to red, green and blue should not be different. Therefore, try to optimize the refractive index modulation to achieve a balance of red, green and blue emission energy.
[0032] Among the existing materials for making volume holographic gratings, the most common one is dichromate gelatin, which has a refractive index modulation degree of up to 0.08-...
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