Augmented reality display based on photo-thermo-refractive glass planar waveguide

Abstract

An augmented reality display based on a planar waveguide made in photo-thermo-refractive glass had been demonstrated. The monolithic integration of multiplexed volume Bragg gratings with the waveguide platform provided in/out-coupling and image transmission from a portable projector. Design and calculation of the grating configuration was performed. The optical replication method was simulated and implemented for manufacturing the multiplexed coupling elements. Resulted field of view was limited by the projection system of the prototype, however can be expanded beyond 50o.

Recording of the Multiplexed Bragg Diffraction Gratings for Waveguides Using Phase Mask

“…The design of the phase mask itself is not the item of the research presented. It is based on a diffraction equation and starts with the periods and slant angles of the Bragg grating that needs to be achieved [6].…”

“…Experiments have shown that for the 2 mm waveguide used, it was possible to achieve 10-20% diffraction efficiency in each of the 10 multiplexes. On the basis of described multiplex diffraction elements, it is possible to create an augmented reality waveguide guide for image transmission [6]. Figure 5b illustrates one substrate guided beam from the green laser light propagating by TIR inside the manufactured planar waveguide.…”

“…In the research, the planar waveguides rely on photo-thermo-refractive (PTR) glass as a holographic volume media. This material is unique for the integration of a phase diffraction elements into the waveguide platform [6]. PTR glass is good material for see-through displays because avoids various problems when exposed to environmental perturbations such as temperature, humidity and pressure, and close to optical glass BK7 by the properties [7].…”

Effects of CeO2 and Sb2O3 on the Nonlinear Photochemical Process in Ultrashort Laser Gaussian—Bessel Beams Irradiated Photo—Thermo—Refractive Glass

“…Photo-thermo-refractive (PTR) glass is a widely used multifunctional transparent material for recording volume holographic gratings [1][2][3] and fabricating a variety of integrated optical elements [4,5]. The excellent manifold properties of PTR glass are chiefly determined by its unique photosensitiveness [6] that is related to the dopants of Ag 2 O, CeO 2 , Sb 2 O 3 , and SnO 2 in trace amounts.…”

Исследование Механизма Записи Мультиплексных Брэгговских Дифракционных Решеток С Планарным Вводом-Выводом Оптического Излучения В Стеклянных Световодах

“…ФТР стекло в качестве голографической объемной среды уникально для интеграции фазовых дифракцион-ных элементов с волноводной платформой [6] и обладает высокой стойкостью к внешним воздействиям (температуре, влажности и давлению) и химической стойкостью [7]. Фазовая структура формируется непосредственно внутри среды, поэтому нет необходимости защищать световод дополнительным стеклом.…”