You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither SPIE nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the SPIE website.
22 April 2008Phase shifting speckle interferometry with nematic liquid crystal light valve
Liquid nematic crystals are nowadays more often used to change the polarization and/or phase and amplitude of
impinging light wave. Nematic liquid crystals valves (LCLV) are also called SLM (Spatial Light Modulator) or LCVR
(Liquid Crystal Variable Retarder). This paper will show the different steps required to get a procedure (optical
mounting and computing software) enabling the use of LCLV in the output beam of the laser coupled with a 3D speckle
interferometry set-up. This LCLV generates the phase shifts between the reference and object beams. The calibration
set-up is made of a Mach Zender interferometer with the LCLV in one arm. Interference fringes are obtained and
recorded with a CCD camera as LCLV voltage is increased. The fringe processing is achieved with a slice analysis in the
Fourier domain. Required phase shifts are then implemented in the phase shifting software. The existing set-up already
uses a phase shifter composed by a moving mirror driven by a piezoelectric transducer (PZT). Results of the calibration
are compared between piezoelectric device and LCVR. The phase shifting rate and resulting phase error shows the main
advantages of the LCVR.
The alert did not successfully save. Please try again later.
Pierre Slangen, "Phase shifting speckle interferometry with nematic liquid crystal light valve," Proc. SPIE 7008, Eighth International Conference on Correlation Optics, 70080W (22 April 2008); https://doi.org/10.1117/12.797004