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Continuous wave achromatic thermal lens spectroscopy.

A Marcano O1, N Melikechi

  • 1Applied Optics Center of Delaware, Center for Research and Education in Optical Sciences and Applications, Delaware State University, 1200 N Dupont Highway, Dover, Delaware 19904, USA. amarcano@desu.edu

Applied Spectroscopy
|July 26, 2007
PubMed
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We developed a new achromatic thermal lens method to reduce aberrations. This technique accurately measured the near-infrared spectrum of water, matching previous findings.

Area of Science:

  • Spectroscopy
  • Optics
  • Physical Chemistry

Background:

  • Thermal lens spectroscopy is a sensitive technique for measuring optical properties.
  • Conventional mode-matched thermal lens methods suffer from chromatic aberrations.
  • Reducing aberrations is crucial for accurate spectral measurements.

Purpose of the Study:

  • To present a mode-mismatched continuous wave (cw) achromatic thermal lens experiment.
  • To reduce chromatic aberrations in thermal lens measurements.
  • To measure the near-infrared spectrum of distilled water.

Main Methods:

  • Utilized a mode-mismatched configuration with a focused pump beam and a collimated probe beam.
  • Implemented a continuous wave (cw) laser source for the experiment.

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  • Collected spectral data in the near-infrared region.

    • Main Results:

    • The mode-mismatched scheme significantly reduced chromatic aberrations compared to mode-matched methods.
    • Successfully measured the near-infrared spectrum of distilled water.
    • Experimental results showed good agreement with established transmission measurements.

    Conclusions:

    • The presented mode-mismatched cw achromatic thermal lens method is advantageous for reducing aberrations.
    • This technique provides accurate spectral measurements, particularly for water.
    • The method holds potential for various spectroscopic applications requiring high precision.