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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 45, Iss. 25 — Sep. 1, 2006
  • pp: 6393–6408

Broadband radio-frequency spectrum analysis in spectral-hole-burning media

Max Colice, Friso Schlottau, and Kelvin H. Wagner  »View Author Affiliations


Applied Optics, Vol. 45, Issue 25, pp. 6393-6408 (2006)
http://dx.doi.org/10.1364/AO.45.006393


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Abstract

We demonstrate a 20   GHz spectrum analyzer with 1   MHz resolution and > 40   dB dynamic range using spectral-hole-burning (SHB) crystals, which are cryogenically cooled crystal hosts lightly doped with rare-earth ions. We modulate a rf signal onto an optical carrier using an electro-optic intensity modulator to produce a signal beam modulated with upper and lower rf sidebands. Illuminating SHB crystals with modulated beams excites only those ions resonant with corresponding modulation frequencies, leaving holes in the crystal's absorption profile that mimic the modulation power spectrum and persist for up to 10   ms . We determine the spectral hole locations by probing the crystal with a chirped laser and detecting the transmitted intensity. The transmitted intensity is a blurred-out copy of the power spectrum of the original illumination as mapped into a time-varying signal. Scaling the time series associated with the transmitted intensity by the instantaneous chirp rate yields the modulated beam's rf power spectrum. The homogeneous linewidth of the rare-earth ions, which can be < 100   kHz at cryogenic temperatures, limits the fundamental spectral resolution, while the medium's inhomogeneous linewidth, which can be > 20   GHz , determines the spectral bandwidth.

© 2006 Optical Society of America

OCIS Codes
(070.1170) Fourier optics and signal processing : Analog optical signal processing
(160.5690) Materials : Rare-earth-doped materials

History
Original Manuscript: December 5, 2005
Manuscript Accepted: April 17, 2006

Citation
Max Colice, Friso Schlottau, and Kelvin H. Wagner, "Broadband radio-frequency spectrum analysis in spectral-hole-burning media," Appl. Opt. 45, 6393-6408 (2006)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-45-25-6393


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