echelle grating


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echelle grating

(ay-shel ) A diffraction grating with very fine lines ruled much farther apart than in other gratings. Such a grating has very high resolution but only over a fairly narrow wavelength band. The resolving power at a given wavelength depends primarily on the total ruled width and the angles of incidence and refraction; a high resolution can be obtained with coarse ruling if the grooves are properly shaped (see blazed grating). The echelle grating of the echelle spectrograph is used at high-order diffraction to give larger angular dispersion. Since the high orders overlap, cross dispersion with, for example, a second grating must be used. The second grating is a standard grating with its direction of dispersion at right angles to that of the echelle; the spectral images of the different orders can then be separated and stacked above one another at the detector.

echelle grating

[ā′shel ‚grād·iŋ]
(spectroscopy)
A diffraction grating designed for use in high orders and at angles of illumination greater than 45° to obtain high dispersion and resolving power by the use of high orders of interference.
References in periodicals archive ?
The Echelle grating spectrometers designed for operation in high orders and high angles of incidence and diffraction, can provide high resolution in a more compact size and cover a much wider spectral range than conventional grating spectrometers [16].
We originally invented this revolutionary technology to more efficiently develop our own echelle grating and miniaturization platform," said Dr.
And the third, Monolithic Chip-to-Chip WDM Optical Proximity Coupler Utilizing Echelle Grating Multiplexer/Demultiplexer Integrated with Micro Mirrors Built on SOI Platform, byD.
On the other hand, the Echelle grating spectrometers, designed for operation in high orders and high angles of incidence and diffraction, can provide high resolution in a more compact size and cover a much wider spectral range than conventional grating spectrometers [19].
an industry leader in silicon photonics, today announced successful demonstration of their Echelle grating Mux and Demux for 500 Gb/s wavelength division multiplexing applications.
LNL's first products will be based on its exclusive echelle grating WDM technology developed by the National Research Council (NRC) of Canada.
The new ProAlign 5000 Component Assembly Workstation handles a broad range of applications including one-sided, two-sided and right-angled planar lightwave circuits (PLCs); optical switches; pitch converters; transceivers; echelle gratings and arrayed waveguide gratings (AWGs); and devices with 90- degree as well as angled faces.