Results 181 to 190 of about 2,028 (199)

Blaze wavelength of convex blazed grating in an Offner spectrometer

SPIE Proceedings, 2010
Compared with other forms of spectrometer, Offner spectrometer with a concentric structure is offering a lot of advantages, such as a compact structure, better imaging quality, lower distortion, and so on, convex grating on the second mirror is the key-component in it.
Bo Yang, Chenglin Liu, Xuezhuan Ding, Xin Wang, Yinnian Liu   +4 more
openaire   +1 more source

Perfectly blazed triangular groove reflection gratings

Journal of the Optical Society of America A, 1984
An experimental and numerical verification of profiles predicted by Cheo et al. [ J. Opt. Soc. Am.67, 1686 ( 1977)] for simultaneous TE- and TM-blazed triangular groove gratings is given. Corrected values also presented. The experimental results at 35 GHz show an n = −1 order diffraction efficiency as high as 99.9% for both polarizations. The numerical
E. V. Jull, N. C. Beaulieu, D. C. W. Hui
openaire   +1 more source

Fabrication of blazed grating by native substrate grating mask

Optical Engineering, 2013
The blazed grating is one of the key elements in a spectrometer. Hence we have adopted a new method of its fabrication. First, the combination of ion beam etching (IBE) and reactive IBE is used to fabricate a native substrate grating mask to replace the traditional photoresist grating mask.
Quan Liu, Jianhong Wu, Minghui Chen
openaire   +1 more source

Grating efficiency theory as it applies to blazed and holographic gratings

Applied Optics, 1977
Recently developed rigorous theories have been used to investigate the diffraction efficiency behavior of both blazed and holographic gratings. In order to assist designers of spectrometric systems we have covered a complete range of blaze angles for triangular grooves and modulations for sinusoidal groove shape in first and second orders.
E G, Loewen, M, Nevière, D, Maystre
openaire   +2 more sources

Fabrication of the convex blazed grating

SPIE Proceedings, 2010
The convex grating is one of the key elements in hyperspectral imaging spectrometers. In this paper the diffraction characteristics of the convex blazed grating is investigated by using rigor ous coupled-wave theory, which indicates that within the wavelength from 0.4 m to 0.8 m, the plus first-order diffraction efficiency can be over 35% through ...
Quan Liu, Haibin Wang, Peng Sun, Jianhong Wu   +3 more
openaire   +1 more source

Blazing phenomena in dielectric-coated gratings

IEEE Antennas and Propagation Society International Symposium. Transmitting Waves of Progress to the Next Millennium. 2000 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.00CH37118), 2002
An analysis method for dielectric-coated reflection gratings of an arbitrary profile is considered for TE polarization case. The blazing phenomena in the dielectric-coated structure is investigated.
null Cheol Hoon Lee, null Ung Hee Cho, null Young Ki Cho   +2 more
openaire   +1 more source

Bragg-angle blazing of diffraction gratings*

Journal of the Optical Society of America, 1975
The Bragg condition λ = 2d sin θ is presented as a necessary condition for perfect (100%) blazing of infinite, perfectly conducting diffraction gratings that produce only a single diffracted order, n = −1. As an illustration, the rectangular-profile grating is analyzed. Design blaze curves, showing the required depth as a function of angle of incidence,
A. Hessel, J. Schmoys, D. Y. Tseng
openaire   +1 more source

Blazed-grating couplers in unibond SOI

SPIE Proceedings, 1999
ABSTRACT Grating couplers can be more efficient than end-fire coupling, in coupling light into a thin film waveguide (thickness of — I im and below). The aim of this work is to fabricate a low cost, highly efficient silicon waveguide grating coupler whichis to be used at the telecommunication wavelength of 1.3 tim.
Martin T. W. Ang, Graham T. Reed, Adrian P. Vonsovici, Alan G. R. Evans, Paul R. Routley, Mike R. Josey   +5 more
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Optimal Shape Design of Blazed Diffraction Gratings

Applied Mathematics and Optimization, 1999
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Double Reflection in the Blazed Grating

2007 IEEE/LEOS International Conference on Optical MEMS and Nanophotonics, 2007
The blazed grating with the Rowland structure has the advantage of self-focusing and is chosen as the major component in the spectrometer chip. In simulations for the blaze angle design in visible spectrum, we discover the phenomenon of the double reflection diffraction. Its cause and parameter space are discussed.
Cheng-Hao Ko, Wei-Chih Liu, Nien-Po Chen, Pao-Ting Cheng, Jian-Shian Lin   +4 more
openaire   +1 more source