Control of spectral aberrations in a monochromator using a plane holographic chirped grating
Applied Optics, Vol. 47, Issue 15, pp. 2750-2759 (2008)
http://dx.doi.org/10.1364/AO.47.002750
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Abstract
A method aimed to minimize the impact of spectral aberrations in a monochromator is proposed in which the spectrum of the source of radiation under study is scanned by the rectilinear translation of a plane chirped grating. The chirped grating, which has a spatially variable groove spacing, is used to diffract and to spectrally focus the radiation. Imaging properties of the chirped grating were analyzed in order to develop the expression of the aberration coefficients of the system and the expression of the width of the instrument line shape due to aberrations. The optimal rectilinear trajectory required to operate the monochromator without significant spectral aberrations in measurements has been obtained numerically and tested in the laboratory. Experimental measurements of the emission spectrum of a seven- wavelength helium–neon laser are presented, as well as the sensitivity of the monochromator performance to different geometrical parameters.
© 2008 Optical Society of America
OCIS Codes
(050.0050) Diffraction and gratings : Diffraction and gratings
(050.1590) Diffraction and gratings : Chirping
(050.1950) Diffraction and gratings : Diffraction gratings
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.4140) Instrumentation, measurement, and metrology : Monochromators
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
ToC Category:
Diffraction and Gratings
History
Original Manuscript: October 12, 2007
Revised Manuscript: April 8, 2008
Manuscript Accepted: April 10, 2008
Published: May 12, 2008
Citation
Alexandre April and Nathalie McCarthy, "Control of spectral aberrations in a monochromator using a plane holographic chirped grating," Appl. Opt. 47, 2750-2759 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-15-2750
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