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Related Concept Videos

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IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
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An imaging spectrometer employing tunable hyperchromatic microlenses.

Phuong-Ha Cu-Nguyen1, Adrian Grewe2, Patrik Feßer2

  • 1Gisela and Erwin Sick Chair of Micro-optics, Department of Microsystems Engineering, University of Freiburg, Freiburg 79110, Germany.

Light, Science & Applications
|September 1, 2018
PubMed
Summary

We developed hydraulically-tunable hyperchromatic lenses for spectral imaging. These lenses axially separate wavelengths, enabling tunable two-dimensional spectral imaging of objects.

Keywords:
hyperchromatic lensimaging spectrometertunable filtertunable lens

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Area of Science:

  • Optics and Photonics
  • Imaging Science
  • Materials Science

Background:

  • Spectral imaging requires systems capable of distinguishing light by wavelength.
  • Traditional spectral imaging techniques can be complex and bulky.
  • Tunable optical components offer potential for more compact and versatile imaging systems.

Purpose of the Study:

  • To design, fabricate, and characterize hydraulically-tunable hyperchromatic lenses.
  • To demonstrate the application of these lenses in two-dimensional spectral imaging.
  • To achieve axial separation of different wavelengths for spectral analysis.

Main Methods:

  • Integration of a positive diffractive lens with a tunable concave lens.
  • Hydraulic actuation for adjusting lens properties.
  • Characterization of spectral dispersion and imaging performance.
  • Demonstration with two distinct hyperchromatic lens designs.

Main Results:

  • Successful fabrication of hydraulically-tunable hyperchromatic lenses.
  • Demonstrated large longitudinal chromatic dispersion for axial wavelength separation.
  • Validated functionality in two-dimensional spectral imaging applications.
  • Characterized spectral performance of two lens concepts.

Conclusions:

  • Hydraulically-tunable hyperchromatic lenses are feasible for spectral imaging.
  • The tunable nature allows for flexible spectral resolution and imaging.
  • These lenses offer a novel approach to compact and adaptable spectral imaging systems.