Results 111 to 120 of about 294 (151)
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Effect of particle defects on an Echelle grating demultiplexer
Optics Communications, 2006The impact of particle defects in the free propagation region on the performance of an etched diffraction grating demultiplexer is analyzed in the present paper. Numerical simulations using a method of moment and a Green function method show that particle defects with some special sizes can result in a strong resonance with the incident wavelength and ...
Xiaohua Cao, Dongyan Wang, Kang Li
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Blaze angle of the Bausch & Lomb R4 echelle grating
Applied Optics, 1983On decrit une nouvelle determination de cet angle basee sur un modele pour le blaze des reseaux echelle qui s'ecarte de celle obtenue par Brown et al.
S, Engman, P, Lindblom
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Echelle volume binary grating: a step forward
SPIE Proceedings, 2012The possibility of making Volume Binary Gratings to be used in high dispersion instrumentations (echelle) is considered. The idea is to study volume gratings with a binary refractive index profile and to optimize it in terms of refractive index modulation, duty cycle, grating thickness keeping in mind the possible limitations in the realization step.
BIANCO, ANDREA, N. Ebizuka
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Attainment of High Resolution with Diffraction Gratings and Echelles*
Journal of the Optical Society of America, 1960The availability of increased resolution, dispersion, and luminosity from plane gratings at high angles of incidence and diffraction is discussed from the standpoints of theory and practice. Reduction in the resolution given by actual gratings at angles above a certain maximum for a given wavelength usually arises from close-lying line-satellites ...
George R. Harrison, George W. Stroke
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The Production of Diffraction Gratings: II The Design of Echelle Gratings and Spectrographs1
Journal of the Optical Society of America, 1949In seeking to circumvent the difficulties that have limited production of ruled gratings having resolving powers in excess of 400,000, it is observed that resolving power at a given wave-length depends only on the ruled width of the grating and the angles of illumination and observation, and not specifically on the number of ruled grooves.
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Perfect blazing with echelle gratings in TE and TM polarization
Optics Letters, 2012Perfect blazing with echelle gratings in a high-order Littrow mount exists not only with TM polarization, as can perhaps be assumed, but also with TE and TM polarizations simultaneously. This finding contradicts with a heuristic explanation as to why perfect blazing is not possible simultaneously in TE and TM polarizations given by Loewen and Popov ...
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A large mosaic echelle grating for ESPRESSO spectrograph
Optical and Infrared Interferometry and Imaging VI, 2018ESPRESSO, The Echelle SPectrograph for Rocky Exoplanet and Stable Spectroscopic Observations, is a super-stable Optical, fiber feed High Resolution Spectrograph for the combined coude focus of the VLT. The instrument has been successfully commissioned end of 2017.
Marco Riva +5 more
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Echelle and holographic gratings compared for scattering and spectral resolution
Applied Optics, 1981An echelle grating with 316 grooves/mm and a 63 degrees blaze angle is compared with a 3600-groove/mm holographic grating. The scattered light and resolution of the 10- x 20-cm gratings are photoelectricaly evaluated in a 3-m spectrometer optimized to eliminate coma and baffled to minimize instrumental scattered light. Both gratings are ghost-free, but
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Examination of the Spectral Efficiency of an Echelle Grating Monochromator
Applied Spectroscopy, 1979The spectral efficiency of an echelle grating monochromator has been examined. The frequently cited advantage that “echelles are blazed at all wavelengths” is observed to be a result of the periodic character of the echelle efficiency as compared with the continually decreasing efficiency from the blaze wavelength for conventional gratings.
Andrew T. Zander, Peter N. Keliher
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The performance of a large echelle grating in a solar spectrometer
Solar Physics, 1967A number of tests of a large diffraction grating are described. It is shown that useful information about the performance of the grating in a spectrometer can be obtained from an analysis of the diffracted wavefront by the method of Stroke. Comparison of the instrumental profile at three wavelengths strongly suggests that the influence of changes in ...
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