Sub-Project One : Study of Simulation Model for Strong Volume Hologram with Complex Wavefront(2/3)

A current story happening for that near-eye head mounted display has been regarded as the most important system to mixed reality, and some of the world-largest IT companies have started mergers and acquisitions for holography company. Volume holographic optical element (VHOE) has clearly performed its unique property and characteristic in IT industry. VHOE has been shown its advantage to generate desired optical wavefront, and the shortage in recording medium has been conquered. One of the remaining important problems for practical application is how to optimize a VHOE regarding to medium, design and manufacturing processes. So far, there are three popular calculation models available for volume holography, including couple mode theory, Born’s approximation, and VOHIL model. All the three models cannot effectively calculate diffraction efficiency and Bragg selectivity in case of complex wavefront. This project is a three-year project, and is one of the four sub-projects of an integrated project. The objective of this project is to propose a new simulation model to solve the essential simulation problem and accordingly VHOEs will be more practical. In the project, first we will follow the original model VOHIL, which was proposed by the project leader CC SUN, and study the phase transfer factor upon diffraction in a VHOE. The phase transfer factor is the key factor to prevent double diffraction to the reading light from the diffraction light. Then we have to study how to insert the coupling strength factor into the simulation model. We need to refer the calculation result by the couple mode theory with two planar waves. The results will be compared with the results by the modified VOHIL, which is called VOHIL-SD. VOHIL-SD will be used to precisely simulate strong diffraction efficiency and Bragg selectivity of a VHOE so that effective optimization and practical design of a VHOE becomes possible. The success of the project will be a big impact to the academics. Also the VOHIL-SD will be very useful in designing new VHOE, which will be important in international IT industry.