Abstract
In this work, we study the imaging characteristics of an optical see-through display based on a holographic waveguide. To fabricate this device, two transmission holograms are recorded on a photopolymer material attached to a glass substrate. The role of the holograms is to couple the incident light between air and the glass substrate, accomplishing total internal reflection. The role of noise reflection gratings and shrinkage on the imaging characteristics of the device will be also explored. The holograms (slanted transmission gratings with a spatial frequency of 1690 lines/mm) were recorded on a polyvinyl alcohol acrylamide holographic polymer dispersed liquid crystal (HPDLC) material. We will show that sufficient refractive index modulation is achieved in the material, in order to obtain high diffraction efficiencies. We will demonstrate that the final device acts as an image formation system.
Highlights
Optical waveguides play an important role in the construction of integrated optical circuits, and are essential in optical telecommunication applications [1]
The shrinkage after the recording process must be controlled. This is because for this particular application slanted gratings are recorded and, as will be explained in Section 4, changes in thickness alter the geometry of the gratings and the reconstruction conditions [26]. Another important fact that must be taking into account in the recording of the holographic waveguide is the possible recording of noise reflection gratings
The limiting shrinkage factor (d’/d) for this grating to disappear is (Equation (18)) 0.93, Once the material has proven to be useful for the recording of transmission gratings with the but it has been observed in the previous discussion that if there is shrinkage, this is very low, so this specifications of the couple in and couple out holograms explained in Section 2, a holographic grating is present in the reconstruction process
Summary
Optical waveguides play an important role in the construction of integrated optical circuits, and are essential in optical telecommunication applications [1]. The use of azo dye doped polymer films allowed photomanipulation of the light diffracted by holographic gratings recorded on this kind of material [25]. For this particular application, the holographic photopolymer material should be adequately designed and optimized attending to two important requirements. This is because for this particular application slanted gratings are recorded and, as will be explained, changes in thickness alter the geometry of the gratings and the reconstruction conditions [26] Another important fact that must be taking into account in the recording of the holographic waveguide is the possible recording of noise reflection gratings.
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