Results 211 to 220 of about 9,378 (232)

Theory of Blazed Holographic Gratings

Journal of Modern Optics, 1989
Abstract Geometric theory of the blazed aberration-corrected holographic grating is derived. This involves generalising the holographic component of the light-path function to permit aberration correction for recording geometries that arrange the two recording wavefronts to be incident from opposite sides of the grating substrate, thereby realising ...
openaire   +2 more sources

Fabrication of Silicon-Blazed Gratings for Couplers

Fiber and Integrated Optics, 2000
( ) To our knowledge, no blazed grating has been fabricated in silicon Si at a pitch of less than half a micron. In this article, we report the fabrication of Si-blazed gratings at the period of 400 nm, using electron beam lithography and ion beam etching techniques.
Ang, T.W., Vonsovici, A., Reed, G.T., Evans, A.G.R., Routley, P.R., Josey, M.R.   +5 more
openaire   +3 more sources

Blaze considerations for multilayer gratings

Optics Communications, 1993
Abstract The effect of changing effective blaze angle across a concave grating coated with an EUV reflecting multilayer is examined. It is concluded that conventionally ruled concave multilayer gratings can have a wide wavelength passband.
openaire   +2 more sources

Blazed Ion-etched Holographic Gratings

Optica Acta: International Journal of Optics, 1976
An ion-etching technique has been successfully applied to the production of blazed holographic plane gratings having various blaze angles ranging from 7 to 26 degrees. Efficiencies of the gratings thus produced were measured in the Littrow configuration as functions of an ion-etching condition, wavelength, and angle of incidence. The maximum efficiency
Y.Aoyagi, S.Namba
openaire   +2 more sources

A Plane Blazed Grating for the keV-range

AIP Conference Proceedings, 2007
Since recent blazed gratings with very shallow blaze angles are technically feasible. This offers the opportunity to explore the keV‐x‐ray range with gratings. A grating with 200 l/mm and a blaze angle of 0.28° has been manufactured by the Carl Zeiss Company and measured with synchrotron radiation from 1.7 keV to 9 keV at BESSY.
K. F. Heidemann, B. Nelles, F. Senf, G. Reichardt   +3 more
openaire   +2 more sources

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   +2 more sources

The fabrication of the holographic dual-blazed grating

SPIE Proceedings, 2013
A holographic dual-blazed grating with the period of 833 nm at ultraviolet-visible-near infrared was designed. To achieve higher and uniform diffraction efficiency, the grating profile was optimized by using rigorous coupled-wave analysis. The results show: when the two blaze angles of the dual-blazed grating, one within the range from 10 degree to ...
Jianhong Wu, Yu Cheng, Minghui Chen, Quan Liu   +3 more
openaire   +2 more sources

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   +2 more sources

A method of fabricating blazed grating by homogenous grating mask

SPIE Proceedings, 2011
In this paper, a new approach has been proposed to fabricate holographic blazed grating. Firstly, a rectangular or trapezoidal grating is fabricated by the combination of photoresist ashing and reactive ion beam etching, and then blazed grating can be achieved by etching rectangular or trapezoidal grating.
Jianhong Wu, Minghui Chen, Quan Liu
openaire   +2 more sources

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.
Graham T. Reed, A. Vonsovici, P. R. Routley, M. R. Josey, Alan G. R. Evans, Martin Tze Wei Ang   +5 more
openaire   +2 more sources