Topic
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: In this paper, an electric field switches the cholesteric cell between three states: two with a uniform inplane director and one with a periodic in-plane director modulation, which produces a Raman-Nath diffractive effect.
Abstract: Electrically switchable diffractive gratings based on cholesteric liquid crystals are suggested. An electric field switches the cholesteric cell between three states: two with a uniform in-plane director and one with a periodic in-plane director modulation. The modulated state produces a Raman–Nath diffractive effect. Characteristic time of switching is of the order of 10 ms. Diffractive properties depend on the polarization of the incident beam and the direction of surface orientation.
90 citations
TL;DR: A novel wave-front sensor comprising a distorted diffraction grating, simple optics, and a single camera is described and performance is validated against different Zernike modes and a representative atmospheric phase map.
Abstract: We describe a novel wave-front sensor comprising a distorted diffraction grating, simple optics, and a single camera. A noniterative phase-diversity algorithm is used for wave-front reconstruction. The sensor concept and practical implementation are described in detail, and performance is validated against different Zernike modes and a representative atmospheric phase map.
90 citations
Patent•
28 Apr 1989TL;DR: An optical multiplexing/demultiplexing device combines an etalon and weak diffraction grating (18) along with temperature control to finely tune local resonant stations along the etalon to separate and/or combine a plurality of optical signals that are finely spaced in wavelength.
Abstract: An optical multiplexing/demultiplexing device (10) combines an etalon (12) and weak diffraction grating (18) along with temperature control to finely tune local resonant stations along the etalon to separate and/or combine a plurality of optical signals that are finely spaced in wavelength.
90 citations
TL;DR: In this paper, a pi-phase-shifted fiber Bragg grating (PSFBG) was used as a high-speed optical temporal integrator for a Gaussian pulse.
Abstract: We present a theoretical study of a new application of a simple pi-phase-shifted fiber Bragg grating (PSFBG) in transmission mode as a high-speed optical temporal integrator. The PSFBG consists of two concatenated identical uniform FBGs with a pi phase shift between them. When the reflectivities of the FBGs are extremely close to 100%, the transmissive PSFBG can perform the time integral of the complex envelope of an arbitrary input optical signal with high accuracy. As an example, the integrator is numerically shown to be able to convert an input Gaussian pulse into an optical step signal.
90 citations
TL;DR: A diode pumped Yb3+ DFB fiber laser comprising a single 10 cm Bragg grating with a permanent π/2 phase shift has been demonstrated in this paper.
Abstract: A diode pumped Yb3+ DFB fibre laser comprising a single 10 cm Bragg grating with a permanent π/2 phase shift has been demonstrated The DFB laser operates at 1047 nm with an in-fibre pump threshold < 230 µW and a 44% one-way slope efficiency DFB operation was demonstrated using the heat-scan technique
90 citations