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Optics Express

Optics Express

  • Editor: J. H. Eberly
  • Vol. 1, Iss. 12 — Dec. 8, 1997
  • pp: 385–389

Ultrafast optical excitation of a combined coherent-squeezed phonon field in SrTiO3

G. A. Garrett, J. F. Whitaker, A. K. Sood, and R. Merlin  »View Author Affiliations


Optics Express, Vol. 1, Issue 12, pp. 385-389 (1997)
http://dx.doi.org/10.1364/OE.1.000385


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Abstract

We have simultaneously excited a coherent and a squeezed phonon field in SrTiO3 using femtosecond laser pulses and stimulated Raman scattering. The frequency of the coherent state (~ 1.3 THz) is that of the A1g-component of the soft mode responsible for the cubic-tetragonal phase transformation at ≈ 110 K. The squeezed field involves a continuum of transverse acoustic phonons dominated by a narrow peak in the density of states at ~ 6.9 THz.

© Optical Society of America

OCIS Codes
(270.1670) Quantum optics : Coherent optical effects
(290.5910) Scattering : Scattering, stimulated Raman
(320.7130) Ultrafast optics : Ultrafast processes in condensed matter, including semiconductors

ToC Category:
Focus Issue: Coherent Phenomena in Solids

History
Original Manuscript: September 30, 1997
Published: December 8, 1997

Citation
Gregory Garrett, John Whitaker, Ajay Sood, and Roberto Merlin, "Ultrafast Optical Excitation of a Combined Coherent-Squeezed Phonon field in SrTiO3," Opt. Express 1, 385-389 (1997)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-1-12-385


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References

  1. R. Merlin, Generating coherent THz phonons with light pulses, Solid State Commun. 102, 207-220 (1997). [CrossRef]
  2. G. A. Garrett, A. G. Rojo, A. K. Sood, J. F. Whitaker and R. Merlin, Vacuum squeezing of solids: macroscopic quantum states driven by light pulses, Science 275, 1638-1640 (1997). [CrossRef] [PubMed]
  3. See, e. g., D. F. Walls and G. J. Wilburn, Quantum Optics (Springer, Berlin, 1994), chap. 2.
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  6. See: W. Zhong and D. Vanderbilt, Effect of quantum fluctuations on structural phase transitions in SrTiO3 and BaTiO3, Phys. Rev. B 53, 5047-5050 (1996), and references therein. [CrossRef]
  7. P. A. Fleury and J. M. Worlock, Electric-Field-Induced Raman scattering in SrTiO3 and BaTiO3, Phys. Rev. 174, 613-623 (1968) [CrossRef]
  8. D. E. Grupp and A. M. Goldman, Giant piezoelectric effect in strontium titanate at cryogenic temperatures, Science 276, 392-394 (1997). [CrossRef] [PubMed]
  9. H. Uwe and T. Sakudo, Stress-induced ferroelectricity and soft modes in SrTiO3, Phys. Rev. B 13, 271-286 (1976). [CrossRef]
  10. W. G. Nielsen and J. G. Skinner, Raman spectrum of strontium titanate, J. Chem. Phys. 48, 2240-2248 (1968). [CrossRef]
  11. W. G. Stirling, Neutron inelastic scattering study of the lattice dynamics of strontium titanate: harmonic models, J. Phys. C 5, 2711-2730 (1972). [CrossRef]

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