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Optics Letters

Optics Letters


  • Vol. 36, Iss. 16 — Aug. 15, 2011
  • pp: 3027–3029

Observation of second-order hyper-Raman generation in LiNbO 3 whispering-gallery mode disk resonators

Matt T. Simons and Irina Novikova  »View Author Affiliations

Optics Letters, Vol. 36, Issue 16, pp. 3027-3029 (2011)

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In this Letter we report experimental demonstration of nonlinear frequency conversion at several optical frequencies in a whispering-gallery mode resonator (WGMR). Because of the enhancement of nonlinear interactions inside a WGMR, interaction of a 1064 nm pump field with a LiNbO 3 disk produced a weak but measurable non-phase-matched 532 nm second-harmonic field at room temperature ( > 100 ° C below the phase-matching temperature) for pump powers of a few tens of milliwatts. For higher pump powers, we observed the generation of four additional fields at 545, 559, 573, and 587 nm . The relative spectral shift between two consecutive fields corresponds to a 455 cm 1 vibrational mode in LiNbO 3 crystal. Our preliminary analysis indicates that these fields are the result of a multiphonon hyper-Raman scattering in which two photons of the pump field are converted into one photon of a higher-frequency field and one or several optical phonons.

© 2011 Optical Society of America

OCIS Codes
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.5650) Nonlinear optics : Raman effect

ToC Category:
Nonlinear Optics

Original Manuscript: May 18, 2011
Manuscript Accepted: July 9, 2011
Published: August 5, 2011

Matt T. Simons and Irina Novikova, "Observation of second-order hyper-Raman generation in LiNbO3 whispering-gallery mode disk resonators," Opt. Lett. 36, 3027-3029 (2011)

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