Results 141 to 150 of about 626 (184)
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Echelle gratings acting as one
Applied Optics, 2003A new device for producing order-sortable echelle spectra by use of consecutive diffactions in several echelle grating surfaces is described. This echelle emulating device (EED) comprises a prism placed in the path between a pair of echelle grating surfaces. The refractive angle of the prism is fixed through a simple relation. The device reproduces all
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An echelle diffraction grating for imaging spectrometer
SPIE Proceedings, 2016We demonstrate an echelle diffraction grating (EDG) of 17 input waveguides and 33 output waveguides. For each input waveguide, only 17 of 33 output waveguides are used, receiving light ranging from 1520 nm to 1600 nm wavelength. The channel spacing of the EDG is 5 nm, with loss of -6dB and crosstalk of -17dB for center input waveguide and -15dB for ...
Minyue Yang +3 more
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Large-ruled monolithic echelle gratings
SPIE Proceedings, 2000This paper will present test and performance data on the two largest monolithic, echelle gratings ever ruled. These cryogenically cooled gratings were manufactured by Hyperfine, Inc. and were developed for the Stratospheric Observatory For Infrared Astronomy (SOFIA).
Kirk G. Bach, Bernhard W. Bach, Jr.
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Fabrication and testing of chemically micromachined silicon echelle gratings
Applied Optics, 2000We have fabricated large, coarsely ruled, echelle patterns on silicon wafers by using photolithography and chemical-etching techniques. The grating patterns consist of 142-microm-wide, V-shaped grooves with an opening angle of 70.6 degrees, blazed at 54.7 degrees.
L D, Keller +4 more
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A Diffraction Model for Echelle Gratings
Journal of Modern Optics, 1991Abstract The diffraction model of echelle gratings is quite special because of its surface structure. Considering the shadow effect by neighbouring grooves, from geometrical deductions, a new diffraction model for echelles has been constructed and used successfully to analyse the values of blaze angle with experimental data.
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High Dispersion Stellar Spectroscopy with an Echelle Grating
Applied Optics, 1970The design and operation of a new 3.7-m echelle spectrograph are described. Both photographic (with image intensifier tube) and photoelectric results are presented, together with a critique of the general performance of the instrument.
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Novel echelle grating: reflector facet transmission grating and prism array for grism
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VINoboru Ebizuka +2 more
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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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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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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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