Results 131 to 140 of about 626 (184)

Planar waveguide echelle gratings in silica-on-silicon

IEEE Photonics Technology Letters, 2004
Silica planar waveguide echelle grating demultiplexers with 48 channels and 256 channels are described and demonstrated. Polarization effects due to stress birefringence and polarization-dependent grating efficiency have been eliminated using a modified polarization compensator and grating design.
Janz, Siegfried, Balakrishnan, A., Charbonneau, Sylvain, Cheben, Pavel, Cloutier, Martin, Delâge, André, Dossou, K., Erickson, L., Gao, M., Krug, P. A., Lamontagne, Boris, Packirisamy, Muthukumaran, Pearson, M., Xu, Dan-Xia   +13 more
openaire   +2 more sources

Some of the next articles are maybe not open access.

Related searches:

Miniaturized optical fiber Bragg grating sensor interrogator based on echelle diffractive gratings

Microwave and Optical Technology Letters, 2007
AbstractAn Optical fiber Bragg grating sensor interrogation device based on monolithically integrated echelle diffractive grating and detector arrays on an InP chip is designed and prototyped. The device weighs less than 60 g and measures smaller than 45 mm × 30 mm × 15 mm, and it is specifically designed for potential integration into aerospace ...
Gaozhi Xiao, Zhenguo Lu, Jiaren Liu
exaly   +2 more sources

Design of a Polarization-Insensitive Echelle Grating Demultiplexer Based on Silicon Nanophotonic Wires

IEEE Photonics Technology Letters, 2008
A polarization-insensitive design of an echelle grating (or etched diffraction grating) demultiplexer based on silicon nanowires is proposed in the present letter, by introducing a polarization compensation area in its free propagation region.
Ning Zhu, Jun Song, Lech Wosiński
exaly   +2 more sources

Echelle gratings: their testing and improvement

Applied Optics, 1976
Tests are described on new master echelles of very large size and on others having unusually high blaze angles, produced on interferometrically controlled ruling engines. Defects arising from the gravitational distortion of large grating blanks during ruling were reduced by the use of calibrated edge-supporting springs to diminish sag.
G R, Harrison, E G, Loewen, R S, Wiley
openaire   +2 more sources

Blaze characteristics of echelle gratings

Applied Optics, 1982
A new model for the blaze function of the two in-plane mountings of echelle gratings is described and extended to account for defects in the edges of the grooves. Expressions for the relative efficiency are given. The model shows that the wavelength for the maximum blaze intensity differs slightly from the wavelength lambda(0) satisfying mlambda(0) = d[
S, Engman, P, Lindblom
openaire   +2 more sources

Improving Echelle Grating Efficiencies

Physica Scripta, 1983
Based on a previous study of echelle grating groove shapes, the groove edge defects of the master and its replicas were measured. It was found that the master and an even number of consecutive replicas have edge defects of several microns, whereas the first replica can be made almost without edge defects (< 0.1 μm).
Sonja Engman, Peter Lindblom, Edward Leibhardt   +2 more
openaire   +1 more source

Echelle gratings for the near-infrared

SPIE Proceedings, 2012
We report on echelle gratings produced by diamond turning with groove spacings coarser than 20 lines per mm. Increasing the groove spacing of an echelle reduces the free spectral range allowing infrared orders to be matched to the detector size. Reflection echelle gratings designed for the near-infrared have potential wide application in both ambient ...
Kenneth H. Hinkle, Richard R. Joyce, Bernhard W. Bach, Erich Bach, Kirk G. Bach, Brooke M. Beam, Gary Poczulp, Verne V. Smith, Lloyd Wallace   +8 more
openaire   +1 more source

The fabrication of the holographic echelle gratings

SPIE Proceedings, 2015
The echelle gratings with the ultra-high resolution are one of the key elements in spectroscopy, optical communications and other fields. Currently, the diamond ruling and the wet etching technique are two primary methods to fabricate echelle gratings. In this paper, we have adopted a new method of the echelle gratings fabrication.
Quan Liu, Fei Gao, Yang Zhou, Jianhong Wu   +3 more
openaire   +1 more source

Advantages of an off-Littrow mounting of an echelle grating

Applied Optics, 1988
A phenomenon is described in which the size of the exit-slit image of the entrance slit is influenced by the angle at which an echelle grating is used. The phenomenon becomes significant only for large deviations from Littrow conditions. A mathematical treatment and experimental results are presented to show that proper exploitation of the effect ...
R, Masters, C, Hsiech, H L, Pardue
openaire   +2 more sources

Astronomical near-infrared echelle gratings

SPIE Proceedings, 2014
High-resolution near-infrared echelle spectrographs require coarse rulings in order to match the free spectral range to the detector size. Standard near-IR detector arrays typically are 2 K x 2 K or 4 K x 4 K. Detectors of this size combined with resolutions in the range 30000 to 100000 require grating groove spacings in the range 5 to 20 lines/mm ...
Kenneth H. Hinkle, Richard R. Joyce, Ming Liang   +2 more
openaire   +1 more source