Frequency-resolved measurement of the orbital angular momentum spectrum of femtosecond ultra-broadband optical-vortex pulses based on field reconstruction

Yamane, Keisaku; Yang, Zhili; Toda, Yasunori; Morita, Ryuji

doi:10.1088/1367-2630/16/5/053020


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Frequency-resolved measurement of the orbital angular momentum spectrum of femtosecond ultra-broadband optical-vortex pulses based on field reconstruction

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/55297

Title:	Frequency-resolved measurement of the orbital angular momentum spectrum of femtosecond ultra-broadband optical-vortex pulses based on field reconstruction
Authors:	Yamane, Keisaku Browse this author →KAKEN DB
	Yang, Zhili Browse this author
	Toda, Yasunori Browse this author →KAKEN DB
	Morita, Ryuji Browse this author →KAKEN DB
Issue Date:	May-2014
Publisher:	Institute of Physics
Journal Title:	New Journal of Physics
Volume:	16
Issue:	5
Start Page:	053020
Publisher DOI:	10.1088/1367-2630/16/5/053020
Abstract:	We propose a high-precision method for measuring the orbital angular momentum (OAM) spectrum of ultra-broadband optical-vortex (OV) pulses from fork-like interferograms between OV pulses and a reference plane-wave pulse. It is based on spatial reconstruction of the electric fields of the pulses to be measured from the frequency-resolved interference pattern. Our method is demonstrated experimentally by obtaining the OAM spectra for different spectral components of the OV pulses, enabling us to characterize the frequency dispersion of the topological charge of the OAM spectrum by a simple experimental setup. Retrieval is carried out in quasi-real time, allowing us to investigate OAM spectra dynamically. Furthermore, we determine the relative phases (including the sign) of the topological-charge-resolved electric-field amplitudes, which are significant for evaluating OVs or OV pulses with arbitrarily superposed modes.
Rights:	http://creativecommons.org/licenses/by/3.0/
Type:	article
URI:	http://hdl.handle.net/2115/55297
Appears in Collections:	工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 森田隆二

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