Measurement limitations in knife-edge tomographic phase retrieval of focused IR laser beams



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Silva López, Manuel and Rico-García, José María and Alda, Javier (2012) Measurement limitations in knife-edge tomographic phase retrieval of focused IR laser beams. Optics Express, 20 (21). pp. 23876-23886. ISSN 1094-4087

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An experimental setup to measure the three-dimensional phase-intensity distribution of an infrared laser beam in the focal region has been presented. It is based on the knife-edge method to perform a tomographic reconstruction and on a transport of intensity equation-based numerical method to obtain the propagating wavefront. This experimental approach allows us to characterize a focalized laser beam when the use of image or interferometer arrangements is not possible. Thus, we have recovered intensity and phase of an aberrated beam dominated by astigmatism. The phase evolution is fully consistent with that of the beam intensity along the optical axis. Moreover, this method is based on an expansion on both the irradiance and the phase information in a series of Zernike polynomials. We have described guidelines to choose a proper set of these polynomials depending on the experimental conditions and showed that, by abiding these criteria, numerical errors can be reduced.

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En acceso abierto en la web del editor (comprobado en julio 2016).
Received 20 Jun 2012; revised 23 Jul 2012; accepted 23 Jul 2012; published 3 Oct 2012.

Uncontrolled Keywords:Lasers ; Laser optics ; Laser beam characterization ; Tomographic image processing ; Phase retrieval ; Wafe-front sensing ; Optical antennas
Subjects:Sciences > Physics > Electromagnetism
Medical sciences > Optics > Imaging systems
Medical sciences > Optics > Physical optics
Medical sciences > Optics > Lasers
ID Code:38640
Deposited On:08 Sep 2016 11:42
Last Modified:19 Sep 2016 10:49

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