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Diffraction grating
About: Diffraction grating is a research topic. Over the lifetime, 24884 publications have been published within this topic receiving 372437 citations. The topic is also known as: grating.
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TL;DR: A new concept to measure rotation angles based on a fiber-optic modal Mach-Zehnder interferometer is demonstrated by using a nonadiabatic taper cascaded with a long-period fiber grating.
Abstract: A new concept to measure rotation angles based on a fiber-optic modal Mach-Zehnder interferometer is demonstrated by using a nonadiabatic taper cascaded with a long-period fiber grating. Information about the magnitude of the rotation angle can be obtained from the measurement of the interference pattern visibility, and under certain conditions it is also possible to obtain the sign of the rotation angle from the induced phase variation in the fiber interferometer.
124 citations
Patent•
07 May 1997
TL;DR: In this article, an electro-optically controlled optical element (300) including a diffraction grating (130) and a planar waveguide (122) associated with the grating and the waveguide being configured to undergo resonance of at least one of transmitted or reflected light at a wavelength selectable by means of an electrical input.
Abstract: This invention discloses an electro-optically controlled optical element (300) including a diffraction grating (130); and a planar waveguide (122) associated with the diffraction grating (130), the diffraction grating (130) and the planar waveguide (122) being configured to undergo resonance of at least one of transmitted or reflected light at a wavelength which is selectable by means of an electrical input.
124 citations
TL;DR: A 2D static binary phase Dammann vortex grating that combines the features of a conventional vortex grates and a Dammann grating is reported, so the low-efficiency problem at higher diffraction orders of conventional vortex gratings is resolved and the detection range of the optical vortices (OVs) is greatly increased.
Abstract: We report a 2D static binary phase Dammann vortex grating that combines the features of a conventional vortex grating and a Dammann grating. This grating uniformly distributes energies among the diffraction orders, so the low-efficiency problem at higher diffraction orders of conventional vortex gratings is resolved and the detection range of the optical vortices (OVs) is greatly increased. Experimental results of OV detection using a fabricated 5×5 Dammann vortex grating are given, and the topological charge detection range from −12 to +12 is achieved. The potential applications of such gratings include transmitting, receiving, and multiplexing OV beams in optical communication systems.
124 citations
TL;DR: Gigahertz surface acoustic waves have been optically generated and detected on aluminum metallic films and silicon wafers using the laser-induced grating technique as mentioned in this paper, and the acoustic velocities were in good agreement with those of Rayleigh waves.
Abstract: Gigahertz surface acoustic waves have been optically generated and detected on aluminum metallic films and silicon wafers using the laser‐induced grating technique. The acoustic velocities were in good agreement with those of Rayleigh waves. Photothermal surface gratings could also be detected as a nonpropagating component of the thermoelastic waves. The relaxation time of the grating was related to the thermal diffusivity of the material. A simplified theory for the generation of surface transient gratings containing acoustic waves is presented in addition to the experimental results.
123 citations
TL;DR: For the first time to the authors' knowledge, fiber Bragg gratings with >80 degrees tilted structures have been fabricated and characterized and exhibit significantly higher refractive-index responsivity and lower thermal cross sensitivity.
Abstract: For the first time to the authors' knowledge, fiber Bragg gratings (FBGs) with >80° tilted structures nave been fabricated and characterized. Their performance in sensing temperature, strain, and the surrounding medium's refractive index was investigated. In comparison with normal FBGs and long-period gratings (LPGs), >80° tilted FBGs exhibit significantly higher refractive-index responsivity and lower thermal cross sensitivity. When the grating sensor was used to detect changes in refractive index, a responsivity as high as 340 nm/refractive-index unit near an index of 1.33 was demonstrated, which is three times higher than that of conventional LPGs. © 2006 Optical Society of America.
123 citations