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Related Concept Videos

Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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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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Updated: Jul 6, 2026

A Multimodal Wide-Field Fourier-Transform Raman Microscope
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Published on: December 30, 2025

Interferometer for use in wave-front testing with a cross slit.

M R Shah1, S K Sarkar, R N Chakraborty

  • 1Department of Applied Physics, University of Calcutta, 92, Acharya Prafulla Chandra Road, Calcutta, India. minaray@cucc.ernet.in

Applied Optics
|March 14, 2008
PubMed
Summary
This summary is machine-generated.

A novel interferometric setup using a cross slit enables wave-front testing by analyzing fringe patterns. This method effectively characterizes coherent wave fronts and beam profile asymmetry in semiconductor diode lasers.

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Area of Science:

  • Optics and Photonics
  • Wavefront Metrology

Background:

  • Wavefront testing is crucial for optical system characterization.
  • Existing methods may lack simplicity or versatility for diverse applications.

Purpose of the Study:

  • To introduce a simple and novel interferometric setup for wavefront testing.
  • To demonstrate its application in analyzing laser beam profiles.

Main Methods:

  • Utilizes a cross slit at the Fourier lens's front focal plane to select orthogonal beam slices.
  • Interference of these slices is observed at a defocused plane near the back focal plane.
  • Analyzes fringe patterns (circular, elliptical, hyperbolic) for wavefront assessment.

Main Results:

  • Successfully demonstrates a simple interferometric setup for general coherent wavefront testing.
  • Experimental results validate the theoretical framework.
  • The method is applied to study asymmetry in semiconductor diode laser beam profiles.

Conclusions:

  • The cross-slit interferometric method offers a versatile approach to wavefront testing.
  • It provides a practical tool for evaluating optical beam quality and characteristics.