Wavefront measurements of phase plates combining a point-diffraction interferometer and a Hartmann-Shack sensor

Abstract

A dual setup composed of a point diffraction interferometer (PDI) and a Hartmann-Shack (HS) wavefront sensor was built to compare the estimates of wavefront aberrations provided by the two different and complementary techniques when applied to different phase plates. Results show that under the same experimental and fitting conditions both techniques provide similar information concerning the wavefront aberration map. When taking into account all Zernike terms up to 6th order, the maximum difference in root-mean-square wavefront error was 0.08 microm, and this reduced up to 0.03 microm when excluding lower-order terms. The effects of the pupil size and the order of the Zernike expansion used to reconstruct the wavefront were evaluated. The combination of the two techniques can accurately measure complicated phase profiles, combining the robustness of the HS and the higher resolution and dynamic range of the PDI.

Testing two techniques for wavefront analysis. Specific applications and comparative study

“…A similar equivalence has been reported before by Bueno et al [16] on the study of phase plates but not in the case of real focusing systems. The system under test was a meniscus lens, whose geometrical and optical properties are shown in Table I.…”

“…In order to establish a comparison criterion, we have used the rootmean square, RMS, wavefront error of a Zernike expansions [6,7,16] which is defined as follows:…”

“…The index starts on 4 because the first 3 terms (0, 1 and 2) are the pseudoaberrations of piston and tilts, which have no relevant information about WA [16], and the term 3 represents the defocus aberration [16], which was removed in order to enhance the higher order aberrations which were the objective of this work.…”

A Broadband Metasurface‐Based Terahertz Flat‐Lens Array

“…For instance, ideal wavefront measurement method can be achieved by combining lens array with Hartmann-Shack sensor at visible light frequencies. [ 31 ] Besides, they are widely used in digital cameras to increase the fi lling factor of the detector array. In the terahertz regime, the lens array is one of the key components in terahertz cameras and terahertz communication systems.…”

Relationship between wave aberrations and histological features in ex vivo porcine crystalline lenses

“…[1][2][3] In vitro measurements of the lens were obtained using ray-tracing or Hartmann-Shack sensor approaches. 4,5 Another alternative is the use of point-diffraction interferometry ͑PDI͒ 6,7 to measure the aberrations of isolated lenses. This technique has been proven to precisely provide the details of the aberrations of lenses within an accuracy of about / 10 and to quantify the so-called biological noise resulting from small misalignments and clusters of crystalline fiber layers throughout the entire lens.…”