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Telephoto-lens-based Optical Differentiation Wavefront Sensor for freeform metrology.

Biswa R Swain, Christophe Dorrer, Jie Qiao

|November 23, 2021

Summary

A new Optical Differentiation Wavefront Sensor using a telephoto lens offers a compact design, reducing system length by five times. This sensor achieves high accuracy (better than λ/10 RMS) and demonstrates tolerance to alignment errors.

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Area of Science:

Optics
Optical Engineering
Wavefront Sensing

Background:

Traditional wavefront sensors can be lengthy.
Compact and accurate wavefront measurement is crucial for optical system testing.

Purpose of the Study:

To develop a compact Optical Differentiation Wavefront Sensor.
To evaluate its performance and compare it with existing methods.

Main Methods:

Utilized a telephoto lens system with binary pixelated filters.
Designed an Optical Differentiation Wavefront Sensor.
Compared measurements with a commercial low-coherence interferometer.

Main Results:

Achieved a five-fold reduction in system length compared to a 4f system.
Measured wavefronts with accuracy better than λ/10 Root Mean Squared (RMS) at λ=633 nm.
Demonstrated high tolerance to component alignment errors.

Conclusions:

The telephoto-lens-based system is a compact and accurate alternative for wavefront sensing.
The sensor's robustness to alignment errors makes it practical for real-world applications.