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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 15 — Jul. 23, 2007
  • pp: 9784–9792

Stretchable diffraction gratings for spectrometry

Aleksey N. Simonov, Semen Grabarnik, and Gleb Vdovin  »View Author Affiliations

Optics Express, Vol. 15, Issue 15, pp. 9784-9792 (2007)

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We have investigated the possibility of using transparent stretchable diffraction gratings for spectrometric applications. The gratings were fabricated by replication of a triangular-groove master into a transparent viscoelastic. The sample length, and hence the spatial period, can be reversibly changed by mechanical stretching. When used in a monochromator with two slits, the stretchable grating permits scanning the spectral components over the output slit, converting the monochromator into a scanning spectrometer. The spectral resolution of such a spectrometer was found to be limited mainly by the wave-front aberrations due to the grating deformation. A model relating the deformation-induced aberrations in different diffraction orders is presented. In the experiments, a 12-mm long viscoelastic grating with a spatial frequency of 600 line pairs/mm provided a full-width at half-maximum resolution of up to ~1.2 nm in the 580–680 nm spectral range when slowly stretched by a micrometer screw and ~3 nm when repeatedly stretched by a voice coil at 15 Hz. Comparison of aberrations in transmitted and diffracted beams measured by a Shack-Hartmann wave-front sensor showed that astigmatisms caused by stretch-dependent wedge deformation are the main factors limiting the resolution of the viscoelastic-grating-based spectrometer.

© 2007 Optical Society of America

OCIS Codes
(010.7350) Atmospheric and oceanic optics : Wave-front sensing
(050.1950) Diffraction and gratings : Diffraction gratings
(120.5800) Instrumentation, measurement, and metrology : Scanners
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(230.4000) Optical devices : Microstructure fabrication

ToC Category:
Diffraction and Gratings

Original Manuscript: May 29, 2007
Manuscript Accepted: July 14, 2007
Published: July 20, 2007

Aleksey N. Simonov, Semen Grabarnik, and Gleb Vdovin, "Stretchable diffraction gratings for spectrometry," Opt. Express 15, 9784-9792 (2007)

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