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, a linearly chirped in-fibre Bragg grating was used to compensate for the pulse broadening arising from negative group-delay dispersion in single mode optical fibre.
Abstract: A linearly chirped in-fibre Bragg grating has been used to compensate for the pulse broadening arising from negative group-delay dispersion in single mode optical fibre. Numerical simulations of the fibre and the Bragg grating produce good agreement with the experiment.<
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113 citations
TL;DR: Both theoretical and experimental studies of dual grating dispersion compensation scheme have been performed, and it is proved to be a prospective way for high brightness spectral beam combination.
Abstract: We report an 8-element spectral beam combination of Yb-doped all fiber superfluorescent sources around 1070 nm wavelength. Each source consists of a 60 mW front-end and a 1.5 kW three-stage fiber amplifier chain. The eight output beamlets are spectrally combined using a home-made polarization-independent multilayer dielectric reflective diffraction grating. 10.8 kW output power is achieved with an efficiency of 94%. Besides, both theoretical and experimental studies of dual grating dispersion compensation scheme have been performed, which is proved to be a prospective way for high brightness spectral beam combination.
113 citations
Patent•
17 Mar 2005
TL;DR: In this article, a diffraction grating and a prism with the appropriate characteristics are employed to provide a combined dispersive characteristic that is substantially linear over the visible spectrum, and a lens is collimated by a lens towards a detector array.
Abstract: A diffraction grating and a prism with the appropriate characteristics are employed to provide a combined dispersive characteristic that is substantially linear over the visible spectrum. Radiation from the grating and prism is collimated by a lens towards a detector array. The grating or a telecentric stop between the grating and prism is placed at a focal point of the lens in a telecentric arrangement so that equal magnification is achieved at the detector array. If the detector array is replaced by a plurality of optical channels, a multiplexer/demultiplexer is obtained.
113 citations
Patent•
12 Sep 2003
TL;DR: In this article, the microparticles are functionalized by coating them with a material/substance of interest, which are then used to perform multiplexed experiments involving chemical processes, e.g., DNA testing and combinatorial chemistry.
Abstract: Microparticles (8, 72) includes an optical substrate (10) having at least one diffraction grating (12) disposed therein. The grating (12) having a plurality of colocated pitches A which represent a unique identification digital code that is detected when illuminated by incident light (24). The incident light (24) may be directed transversely from the side of the substrate (10) with a narrow band (single wavelength) or multiple wavelength source, in which case the code is represented by a spatial distribution of light or a wavelength spectrum, respectively. The code may be digital binary or may be other numerical bases. The micro-particles (8, 72) can provide a large number of unique codes, e.g., greater than 67 million codes, and can withstand harsh environments. The micro-particles (8) are functionalized by coating them with a material/substance of interest, which are then used to perform multiplexed experiments involving chemical processes, e.g., DNA testing and combinatorial chemistry.
113 citations
TL;DR: In this article, an accurate method for computing the elecromagnetic field distribution in lamellar gratings is proposed, which relies on the rigorous coupled-wave analysis provided accurate numerical results and avoids possible sources of artefacts due to permittivity discontinuities.
Abstract: In this paper, an accurate method for computing the elecromagnetic field distribution in lamellar gratings is proposed. The method that relies on the rigorous coupled-wave analysis provides accurate numerical results and avoids possible sources of artefacts due to permittivity discontinuities. Its performance is analysed through various lamellar grating cases, including dielectric and metallic materials, the visible and near-infrared (1–10 μm) regions of the spectrum. Special attention is placed on field singularities which are in general present at the grating wedges for transverse magnetic polarization.
113 citations