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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 2 — Jan. 10, 2012
  • pp: 181–190

Spectral superresolution with ultrashort optical pulses

Naum K. Berger  »View Author Affiliations


Applied Optics, Vol. 51, Issue 2, pp. 181-190 (2012)
http://dx.doi.org/10.1364/AO.51.000181


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Abstract

A superresolution technique for the measurement of transmission, reflection, and absorption spectra is proposed. An ultrashort laser pulse is propagated in a dispersive element and then periodically phase modulated. The temporal modulation is transformed into periodic spectral modulation, for which the number of harmonics, 2M+1, is determined by the modulation index. The modulated pulse is transmitted through (reflected from) the sample to be tested and measured by a spectrometer. By performing 2M+1 measurements for 2M+1 delays between the dispersed pulse and modulation signal, one can restore the spectral response of the sample with superresolution after simple processing. We numerically demonstrate the measurement of the transmission spectrum of an ultranarrow optical filter with a minimum feature of 0.43 pm by an optical spectrum analyzer with a 10 pm resolution. A twentyfold enhancement of the resolution is achieved in the presence of noise with a level of 0.1%. The advantage of the system is its full reconfigurability.

© 2012 Optical Society of America

OCIS Codes
(060.5060) Fiber optics and optical communications : Phase modulation
(060.5530) Fiber optics and optical communications : Pulse propagation and temporal solitons
(300.6320) Spectroscopy : Spectroscopy, high-resolution

ToC Category:
Spectroscopy

History
Original Manuscript: July 11, 2011
Manuscript Accepted: August 25, 2011
Published: January 9, 2012

Citation
Naum K. Berger, "Spectral superresolution with ultrashort optical pulses," Appl. Opt. 51, 181-190 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-2-181

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