Electronic shear interferometry: application of a (double-) pulsed laser.

Area of Science:

• Optics and Photonics
• Metrology
• Experimental Physics

Background:

• Traditional interferometric metrology often requires highly stable experimental setups.
• Studying high-speed dynamic processes using interferometry presents significant challenges.
• Pulsed lasers offer potential solutions but require careful implementation.

Purpose of the Study:

• To demonstrate the advantages of using a double-pulsed laser in electronic shear interferometry.
• To present an image subtraction method for generating high-quality fringe patterns.
• To analyze and compare fringe visibility with existing techniques.

Main Methods:

• Utilized a double-pulsed laser system for interferometric measurements.
• Applied image subtraction techniques to process interferometric data.
• Conducted theoretical analysis of fringe visibility.
• Compared results with television-holography.

Main Results:

• The double-pulsed laser relaxes stability requirements for the experimental setup.
• Image subtraction successfully produced high-quality fringe patterns without special apertures.
• The double-pulse subtraction technique demonstrated compensation for laser intensity fluctuations.
• Fringe visibility was theoretically analyzed and compared to television-holography.

Conclusions:

• Double-pulsed lasers are effective for electronic shear interferometry, enabling study of dynamic processes.
• The proposed image subtraction method enhances fringe pattern quality and stability.
• This technique offers improved performance by mitigating laser intensity variations.