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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 11 — May. 30, 2005
  • pp: 4125–4133

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

Naoyuki Tamura, Graham J. Murray, Ray M. Sharples, David J. Robertson, and Jeremy R. Allington-Smith  »View Author Affiliations

Optics Express, Vol. 13, Issue 11, pp. 4125-4133 (2005)

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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 the 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.

© 2005 Optical Society of America

OCIS Codes
(050.7330) Diffraction and gratings : Volume gratings
(300.6340) Spectroscopy : Spectroscopy, infrared

ToC Category:
Research Papers

Original Manuscript: March 30, 2005
Revised Manuscript: May 13, 2005
Published: May 30, 2005

Naoyuki Tamura, Graham Murray, Ray Sharples, David Robertson, and Jeremy Allington-Smith, "Measurement of throughput variation across a large format volume-phase holographic grating," Opt. Express 13, 4125-4133 (2005)

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