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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
Published on: March 20, 2017
Optical wavefront measurement using phase retrieval with transverse translation diversity.
Gregory R Brady1, Manuel Guizar-Sicairos, James R Fienup
1The Institute of Optics, University of Rochester, Rochester, New York 14627-0186, USA. grbrady@gmail.com
Optics Express
|January 23, 2009
Summary
This study introduces transverse translation-diverse phase retrieval for accurate wavefront measurement, even with undersampled data. The technique uses a moving subaperture to achieve precise wavefront characterization.
Area of Science:
- Optical Metrology
- Wavefront Sensing
- Interferometry
Background:
- Accurate wavefront measurement is crucial for optical system performance.
- Undersampled intensity patterns pose a challenge for traditional wavefront sensing techniques.
Purpose of the Study:
- To demonstrate transverse translation-diverse phase retrieval for wavefront measurement.
- To address limitations of undersampled intensity data in optical metrology.
Main Methods:
- Utilizing a smaller, moving subaperture to generate multiple, adequately sampled intensity patterns.
- Employing an optimization algorithm jointly constrained by these patterns for wavefront retrieval.
- Deriving expressions for the gradient of an error metric with respect to optimization parameters.
Main Results:
- Successfully measured the transmitted wavefront of a plano-convex singlet.
- Achieved measurement repeatability within approximately lambda/100 RMS.
- Demonstrated the efficacy of the transverse translation-diverse phase retrieval method.
Conclusions:
- Transverse translation-diverse phase retrieval is a robust method for wavefront measurement.
- The technique overcomes challenges associated with undersampled intensity data.
- Experimental validation confirms high precision and repeatability of the method.
