Optical Design and Engineering

Measuring topological charges of Laguerre–Gaussian vortex beams using two improved Mach–Zehnder interferometers

[+] Author Affiliations
Jianjun Guo, Banghong Guo

South China Normal University, Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, Guangzhou Higher Education Mega Center, No. 378, Outer Ring West Road, Panyu District, Guangzhou, Guangdong Province 510006, China

University of Science and Technology of China, Chinese Academy of Sciences, Key Laboratory of Quantum Information, No. 96, Jinzhai Road, Baohe District, Hefei, Anhui Province 230026, China

Ronghua Fan, Wenjie Zhang, Yu Wang, Litao Zhang, Panpan Zhang

South China Normal University, Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, Guangzhou Higher Education Mega Center, No. 378, Outer Ring West Road, Panyu District, Guangzhou, Guangdong Province 510006, China

Opt. Eng. 55(3), 035104 (Mar 22, 2016). doi:10.1117/1.OE.55.3.035104
History: Received January 18, 2016; Accepted March 1, 2016
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Abstract.  We demonstrate, theoretically and experimentally, a new method to measure high-order topological charges (TCs) of Laguerre–Gaussian vortex beams, including the magnitude and the sign, by analyzing the interference intensity patterns. The magnitude is determined by analyzing the interference intensity patterns between the vortex beam and its conjugate beam, and using an improved Mach–Zehnder interferometer with a dove prism. Counting the number of interference bright petals attests to the magnitude of high-order TCs through half of the bright petal number. After the TC is modulated by a spiral phase plate, the sign is acquired by comparing the counting results of two charge-coupled devices. Just by this method, we have been able to measure both the magnitude and the sign of the TCs up to l=±90. Our experimental results are in good agreement with the numerical simulations.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Jianjun Guo ; Banghong Guo ; Ronghua Fan ; Wenjie Zhang ; Yu Wang, et al.
"Measuring topological charges of Laguerre–Gaussian vortex beams using two improved Mach–Zehnder interferometers", Opt. Eng. 55(3), 035104 (Mar 22, 2016). ; http://dx.doi.org/10.1117/1.OE.55.3.035104


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