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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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Related Experiment Video

Updated: Mar 30, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Specular and antispecular light beams.

Henri Partanen, Najnin Sharmin, Jani Tervo

    Optics Express
    |November 13, 2015
    PubMed
    Summary

    Researchers created novel partially coherent light beams using a wavefront-folding interferometer. These beams maintain shape during propagation and show unique central peaks or dips, controllable by spatial coherence.

    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Coherent Beam Generation

    Background:

    • Partially coherent light beams are crucial in various optical applications.
    • Gaussian Schell-model beams are a common type of partially coherent source.
    • Controlling beam structure and coherence is an ongoing research area.

    Purpose of the Study:

    • To investigate a new class of partially coherent beams generated via wavefront folding.
    • To analyze the propagation characteristics and internal structure of these beams.
    • To experimentally demonstrate and measure the spatial coherence of these novel beams.

    Main Methods:

    • Generating partially coherent beams by passing a Gaussian Schell-model beam through a wavefront-folding interferometer.
    • Analyzing beam propagation and shape invariance.

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  • Experimentally demonstrating the beams using a digital micromirror device.
  • Measuring the complex degree of spatial coherence.

    • Main Results:

    • Demonstrated shape-invariant partially coherent beams on propagation.
    • Observed distinct internal structures: specular beams with central peaks and antispecular beams with central dips.
    • Showed that beam dimensions are dependent on the spatial coherence area.
    • Measured cross-like spatial coherence distributions experimentally.

    Conclusions:

    • Wavefront folding of Gaussian Schell-model beams produces novel, shape-invariant partially coherent beams.
    • The internal structure (peak or dip) and dimensions are controllable via spatial coherence.
    • Experimental validation confirms the theoretical predictions and highlights the utility of digital micromirror devices for coherence measurements.