Cookies

We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.


Durham Research Online
You are in:

Measurement of throughput variation across a large format volume-phase holographic grating.

Tamura, N. and Murray, G. J. and Sharples, R.M. and Robertson, D.J. and Allington-Smith, J.R. (2005) 'Measurement of throughput variation across a large format volume-phase holographic grating.', Optics express., 13 (11). pp. 4125-4133.

Abstract

In this paper, we report measurements of diffraction efficiency and angular dispersion for a large format (~ 25 cm diameter) Volume-Phase Holographic (VPH) grating optimized for near-infrared wavelengths (0.9 ~ 1.8 μm). The aim of this experiment is to see whether optical characteristics vary significantly across the grating. We sampled three positions in the grating aperture with a separation of 5 cm between each. A 2 cm diameter beam is used to illuminate the grating. At each position, throughput and diffraction angle were measured at several wavelengths. It is found that whilst the relationship between diffraction angle and wavelength is nearly he same at the three positions, the throughputs vary by up to ~ 10% from position to position. We explore the origin of the throughput variation by comparing the data with predictions from coupled-wave analysis. We find that it can be explained by a combination of small variations over the grating aperture in gelatin depth and/or refractive index modulation amplitude, and amount of energy loss by internal absorption and/or surface reflection.

Item Type:Article
Keywords:Diffraction, Gratings, Volume gratings, Spectroscopy, Infrared.
Full text:PDF - Other (168Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1364/OPEX.13.004125
Publisher statement:This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/abstract.cfm?URI=oe-13-11-4125 Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
Record Created:08 May 2008
Last Modified:05 Mar 2014 10:16

Social bookmarking: del.icio.usConnoteaBibSonomyCiteULikeFacebookTwitterExport: EndNote, Zotero | BibTex
Usage statisticsLook up in GoogleScholar | Find in a UK Library