Rotated chirped volume Bragg gratings(r-CVBGs) have recently emerged as a unique optical element with use in a diverse and wide range of applications including compact spectrometers, pulse phase modulation, and others. They are offering noteworthy advantages over conventional surface gratings including compactness, robustness, and high-power handling capabilities. The recording of r-CVBGs in photo-thermo-refractive-glass (PTR) utilizing holographic techniques brings flexibility to the design of the grating while requiring careful and precise recording system alignment. The comprehensive design and fabrication process of r-CVBGs provides insights for the future development of these promising optical components.
Texas-Instruments phase-light-modulator (TI-PLM) is composed of a 2D array of micro-mirrors that move in a piston motion by a fraction of wavelength to modulate the optical path length of a beam. Such light phase modulation, which is required for holography, could be a promising alternative to the liquid crystal-based spatial-light-modulators (SLMs). In comparison, TI-PLM has better diffraction efficiency, enlarged reflection angle, reduced pixel size, and faster refresh speed which expands the spatial bandwidth. All these properties benefit the recording of complex holograms. We demonstrate the successful use of TI-PLM to record a variety of such holograms.
Traditional head-up-displays (HUDs) suffer from a lack of compactness mainly due to the use of bulky optics (i.e., folding mirrors, beam combining optics). The implementation of holographic optical elements (HOEs) in the development of HUDs leads to lighter and more compact units. The aim of this presentation is to demonstrate the use of hologram recording in photo-thermo-refractive (PTR) glass technology for fabricating a diffractive 2D beam splitter for head-up display eye-box. We explored two directions – a combination of transmitting volume Bragg gratings and holographic phase masks encrypted in such Bragg gratings.
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