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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 45, Iss. 15 — May. 20, 2006
  • pp: 3430–3441

Zoom lens design for a novel imaging spectrometer that controls spatial and spectral resolution individually

Jin Choi, T. H. Kim, H. J. Kong, and Jong Ung Lee  »View Author Affiliations

Applied Optics, Vol. 45, Issue 15, pp. 3430-3441 (2006)

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A novel imaging spectrometer can individually control spatial and spectral resolution by using zoom lenses as the foreoptics of the system and a focusing lens. By varying the focal length we can use the focusing lens to change the spatial and spectral dimensions; with the foreoptics, however, we can change only the spatial dimension. Therefore the spectral resolution and the spectral range are affected by the zoom ratio of the focusing lens, whereas the spatial resolution and the field of view are affected by the multiplication of the zoom ratios of the foreoptics and the focusing lens. By properly combining two zoom ratios, we can control the spectral resolution with a fixed spatial resolution or the spatial resolution with a fixed spectral resolution. For an imaging spectrometer with this novel zooming function, we used the lens module method and third-order aberration theory to design an initial four-group zoom system with an external entrance pupil for the focusing lens. Furthermore, using the optical design software CODE V, we obtained an optimized zoom lens with a focal-length range of 50 to 150   mm . Finally, the zoom system with its transmission grating in the Littrow configuration performs satisfactorily as the focusing lens of an imaging spectrometer in the wavelength range 450–900 nm.

© 2006 Optical Society of America

OCIS Codes
(080.3620) Geometric optics : Lens system design
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(220.2740) Optical design and fabrication : Geometric optical design

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: August 31, 2005
Revised Manuscript: December 26, 2005
Manuscript Accepted: December 28, 2005

Jin Choi, T. H. Kim, H. J. Kong, and Jong Ung Lee, "Zoom lens design for a novel imaging spectrometer that controls spatial and spectral resolution individually," Appl. Opt. 45, 3430-3441 (2006)

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