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Reflective grating interferometer: a folded reversal and shearing wave-front interferometer.

Pietro Ferraro1, Nicola Sergio De, Andrea Finizio

  • 1Istituto di Cibernetica del Consiglio Nazionale delle Ricerche, Edoardo Caianiello, Comprens. A. Olivetti, Pozzuoli, Napoli, Italy. p.ferraro@cib.na.cnr.it

Applied Optics
|March 20, 2002
PubMed
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A modified reflecting grating interferometer (RGI) with lateral shear can now detect asymmetrical aberrations like coma, astigmatism, and spherical aberration. This enhanced RGI offers broader applications in optical testing.

Area of Science:

  • Optical Engineering
  • Interferometry
  • Aberration Analysis

Background:

  • The standard reflecting grating interferometer (RGI) is effective for evaluating asymmetrical aberrations, specifically third-order coma.
  • It can analyze coma in both collimated and non-collimated beams.

Purpose of the Study:

  • To propose and analyze a novel optical configuration of the RGI.
  • To enhance the RGI's sensitivity to a wider range of third-order aberrations.

Main Methods:

  • Introduced a lateral shearing component to the existing folding and reversal operations of the RGI.
  • Developed optical path difference equations for interpreting interferograms generated by the modified RGI.
  • Conducted numerical simulations to validate the interferometer's performance in the shearing configuration.

Related Experiment Videos

Main Results:

  • The modified RGI with lateral shear demonstrates sensitivity to defocusing, astigmatism, and spherical aberration, in addition to coma.
  • Optical path difference equations and simulation results confirm the functionality of the shearing configuration for aberration analysis.

Conclusions:

  • The proposed RGI configuration significantly expands the range of detectable aberrations.
  • This enhanced interferometer holds potential for more comprehensive optical testing and characterization.