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Area of Science:

  • Optics and Photonics
  • Fluid Dynamics
  • Materials Science

Background:

  • Optical probing is crucial for R&D but struggles with transparent materials like low-density gas jets.
  • Existing techniques often reach sensitivity limits when analyzing samples with refractive indices near unity.

Purpose of the Study:

  • To develop an advanced optical probing method with increased phase sensitivity.
  • To overcome the limitations of current techniques for analyzing weakly interacting or transparent samples.

Main Methods:

  • Employed a multi-pass probe technique, specifically a four-pass interferometer.
  • Integrated relay-imaging between passes to maintain spatial resolution.
  • Validated the method using tomographic characterization of low-density supersonic gas jets.

Main Results:

  • Demonstrated a significant increase in phase sensitivity for optical probing.
  • Successfully quantified fine features, including shock structures, in low-density gas jets.
  • Showcased the method's ability to improve sensitivity for absorption and polarization contrast.

Conclusions:

  • The novel multi-pass optical probing method enhances sensitivity for transparent and weakly interacting objects.
  • This technique offers improved quantitation of fine features in challenging samples.
  • The method has broad applicability for various optical characterization techniques in transmission and reflection.