Topic
Diffraction efficiency
About: Diffraction efficiency is a research topic. Over the lifetime, 10320 publications have been published within this topic receiving 158298 citations.
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TL;DR: In this article, phase holograms have been recorded using several photopolymers using self-developing and self-repairing photopolymer recording systems and requiring only uv-light fixing.
Abstract: Phase holograms have been recorded using several photopolymers. These photopolymer recording systems are self-developing and require only uv-light fixing. Sensitivities as high as 0.6 mJ/cm2 have been achieved with He–Ne–laser light. Reconstructions from 3000-line/mm gratings recorded on these materials have been achieved; however, the signal-to-noise ratio falls off above 1500 lines/mm. Microscopy has revealed that the hologram is recorded both on the surface and in the volume of the polymer, and that the surface modulation provides the dominant contribution to the diffraction efficiency for 25-μm-thick films.
113 citations
TL;DR: In this paper, two-photon-induced refractive index changes in As2S3 were observed by exposure in the 800-nm region by writing interference gratings on a 2-μm thin film.
Abstract: We observed two-photon-induced refractive-index changes in As2S3 by exposure in the 800-nm region. We studied this photosensitivity by writing interference gratings on a 2-μm As2S3 thin film. This property is the key to creating self-written channel waveguides in a planar As2S3 slab.
113 citations
TL;DR: An architecture-specific beam-combining scheme is considered and the cross-talk minimization problem based on optimal channel positioning is addressed and five-channel high efficiency spectral beam combining resulted in a >750 W near-diffraction-limited cw beam has been demonstrated experimentally.
Abstract: The possibility of achieving multikilowatt laser radiation by spectrally combining beams using volume Bragg gratings (VBGs) is shown. The VBGs recorded in a photothermorefractive glass exhibit long-term stability of all its parameters in high-power laser beams with power density >1 MW/cm2 in the cw beam of total power on a kilowatt level. We consider an architecture-specific beam-combining scheme and address the cross-talk minimization problem based on optimal channel positioning. Five-channel high efficiency spectral beam combining resulted in a >750 W near-diffraction-limited cw beam has been demonstrated experimentally.
112 citations
TL;DR: A new real-time interferometer based on diffraction phenomena is discussed, which consists of a point-diffraction interferometers fabricated on a transmission grating and achieved by simultaneously introducing a phase shift on the three separate channels of diffracted interferograms.
Abstract: A new real-time interferometer based on diffraction phenomena is discussed. It consists of a point-diffraction interferometer fabricated on a transmission grating. The real-time data-analysis capability is achieved by simultaneously introducing a phase shift (piston) on the three separate channels of diffracted interferograms. Mathematical analysis and preliminary observational results are included.
112 citations
TL;DR: This system successfully realizes a hologram recording/retrieving at a low diffraction efficiency less than 2.0 x 10(-3) and achieves a raw data density of 180 Gbit/in, thus demonstrating the potential of a coaxial holographic system for high-density optical storage systems.
Abstract: We describe a coaxial holographic recording system for achieving high recording density. We implement several techniques, such as an objective lens with high numerical aperture (NA), high capacity page data format, a random binary phase mask, and an optical noise reduction element. Our system successfully realizes a hologram recording/retrieving at a low diffraction efficiency less than 2.0×10-3 and achieves a raw data density of 180 Gbit/in.2, thus demonstrating the potential of a coaxial holographic system for high-density optical storage systems.
112 citations