Dynamical holography and wavefront control with liquid-crystal light valve

被引:0
|
作者
Residori, S. [1 ]
Bortolozzo, U. [1 ]
Dolfi, D. [2 ]
Nouchi, P. [2 ]
Huignard, J. P. [3 ]
Molin, S. [2 ]
Peigne, A. [4 ]
机构
[1] Univ Nice Sophia Antipolis, CNRS, INLN, 1361 Route Lucioles, F-06560 Valbonne, France
[2] Thales Res Technol, Campus Polytech,1 Av Augustin Fresnel, F-91767 Palaiseau, France
[3] Jphopto, 20 Rue Campo Formio, F-75013 Paris, France
[4] Thales Underwater Syst, 525 Route Dolines, F-06901 Sophia Antipolis, France
来源
SLOW LIGHT, FAST LIGHT, AND OPTO- ATOMIC PRECISION METROLOGY X | 2017年 / 10119卷
关键词
Holographic interferometry; digital holography; liquid-crystals; optical wave-mixing; optical sensing; INTERFEROMETRY;
D O I
10.1117/12.2261129
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
Dynamical holography is an interferometric method that allows the measurements of phase modulations in the presence of environmental low-frequency fluctuations. The technique is based on the use of a nonlinear recombining medium that performs the dynamic hologram through a beam-coupling process. In our work, as the nonlinear medium, we use an optically addressed spatial light modulator operating at 1.55 mu m. The beam coupling process allows obtaining a phase modulation sensitivity of 200 mu rad/root Hz at 1 kHz. The interferometer behaves as an optical high pass filter, with a cutoff frequency of approximately 10 Hz, thus, filtering slow phase disturbances, such as due to temperature variations or low frequency fluctuations, and keeping the detection linear without the need of heterodyne or active stabilization. Moreover, owing to the basic principles of holography, the technique can be used with complex wavefronts, such as the speckled field reflected by a highly scattering surface or the optical field at the output of a multimode optical fiber. We demonstrate, both theoretically and experimentally, that using a multimode optical fiber as sensing element, rather than a single mode fiber, allows improving the interferometer phase sensitivity. Finally, we present a phase-OTDR optical fiber sensor architecture using the adaptive holographic interferometer.
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页数:10
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