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Temporal and spectral degrees of polarization of light
KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
2011 (English)In: Proc SPIE Int Soc Opt Eng, 2011Conference paper (Refereed)
Abstract [en]

The degree of polarization is a central quantity in the characterization of random electromagnetic beams and it has been introduced both in the time and the frequency domains. Physically, the spectral degree of polarization corresponds to that of a field obtained by filtering a generally broad-band light by a narrow-band filter. It is known that the two degrees of polarization can generally assume different values and no simple relationship exists between them. For example, a stationary field can have an arbitrary degree of polarization in the frequency domain although the field is fully unpolarized in the time domain. Moreover, the field can be fully polarized at every frequency, but in the time domain the field may be anything between unpolarized and polarized. In this work, we study the connections between the time and frequency domain degrees of polarization. We introduce a mean spectral degree of polarization and show that it provides an upper limit for the value of the time-domain degree of polarization that can be obtained if arbitrary unitary transformations are performed in the frequency domain. A mean spectral degree of polarization equal to one indicates that the field is fully polarized in the frequency domain and thus can be made fully polarized also in the time domain by unitary transformations in the frequency domain, i.e., without absorption of energy

Place, publisher, year, edition, pages
, Proceedings of SPIE - The International Society for Optical Engineering, ISSN 0277-786X ; 8171
Keyword [en]
Mean spectral degree of polarization, Polarization, Time and frequency domain, Absorption of energy, Arbitrary degree, Broad bands, Degree of polarization, Degrees of polarization, Frequency domains, Narrow band filter, Random electromagnetic beams, Spectral degree, Time and frequency domains, Time domain, Unitary transformations, Upper limits, Frequency domain analysis, Light, Physical optics
National Category
Atom and Molecular Physics and Optics
URN: urn:nbn:se:kth:diva-150677DOI: 10.1117/12.896894ISI: 000302696000002ScopusID: 2-s2.0-80955140500ISBN: 9780819487971OAI: diva2:744933
Physical Optics, 5 September 2011 through 6 September 2011, Marseille, France

QC 20140909

Available from: 2014-09-09 Created: 2014-09-08 Last updated: 2014-09-09Bibliographically approved

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Friberg, Ari T.
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