This article describes experiments to create a sensitive element of a holographic wavefront sensor. The changes made made it possible to record wavefront aberrations in the Zernike polynomials on holograms and reliably reproduce them with a reference beam.
Holographic wavefront sensors are the convenient tool for the fast, cheap and computation lacking wavefront analysis. The use of holographic filters-correlators makes it possible to decompose the wavefront along the basis of Zernike polynomials or to represent it as a set of piston segments. The paper considers possible application of such a technique for beam decomposition along other basis like Hermite-Gauss, Laguerre-Gauss and so on sets.
First experimental demonstration of the device, providing measurement of Zernike polynomial in the incoming wavefront by the use of the Fourier-hologram, recorded with the use of diffuse scattered beam. Signal to noise ratio of such approach was investigated. It is shown that one can easily realize such a device, providing simultaneous and noise-lacking measurement of several dozen Zernike modes.
In this paper, the determination of the topological charge of the vortex beams by means of shearing interferometry was achieved, for both common and non-common path shearing interferometers, using simple yet effective optical elements. The recording and analysis of interference patterns from different setups was accomplished using: cyclic, rotational and reversal shearing interferometers. The use of cyclic and rotational shearing interferometers resulted in interference patterns with two oppositely oriented forks for both setups. However, with the reversal shearing interferometer, a single forked pattern was obtained and a mathematical approximation was deduced.
Many areas of optical science and technology require fast and accurate measurement of the radiation wavefront shape. Today there are known a lot of wavefront sensor (WFS) techniques, and their number is growing up. The last years have brought a growing interest in several schematics of WFS, employing the holography principles and holographic optical elements (HOE). Some of these devices are just the improved versions of the standard and most popular Shack-Hartman WFS, while other are based on the intrinsic features of HOE. A holographic mode wavefront sensor is proposed, which makes it possible to measure up to several tens of wavefront modes. The increase in the number of measured modes is implemented using the conversion of a light wave entering the sensor into a wide diffuse light beam, which allows one to record a large number of holograms, each intended for measuring one of the modes
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.