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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 28, Iss. 10 — Oct. 1, 2011
  • pp: 2436–2443

Enhancement of stimulated Raman scattering in terrace-microspheres

Hiyori Uehara, Tetsuo Kishi, Tetsuji Yano, and Shuichi Shibata  »View Author Affiliations


JOSA B, Vol. 28, Issue 10, pp. 2436-2443 (2011)
http://dx.doi.org/10.1364/JOSAB.28.002436


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Abstract

Terrace-microspheres of high-index glass ( BaO - SiO 2 - TiO 2 glass, n D = 1.93 ) containing 0.3 ppm of Nd 3 + were used to investigate the interaction between Raman scattering due to a glass matrix and fluorescence due to Nd 3 + . The terrace-microspheres were pumped with a tunable CW Ti:sapphire laser ( 790 nm 830 nm wavelength) for changing pumping wavelengths. With pumping in the 800 830 nm wavelength region, there was a spectral overlap between Raman scattering and Nd 3 + fluorescence. Under such conditions, Nd 3 + fluorescence works as a seeding and an amplifier of stimulated Raman scattering (SRS), resulting in SRS enhancement. With pumping of 20 mW power at around 830 nm wavelength, the terrace-microspheres showed the strongest SRS gain, 5–6 times of that of 790 nm wavelength pumping. SRS thresholds of the terrace-microspheres were improved from 3 mW ( 790 nm wavelength pumping) to 0.3 mW ( 830 nm pumping) due to the enhancement effect. The potential application for a multiwavelength Raman laser with a low threshold was demonstrated in the near-IR region ( λ = 840 940 nm ).

© 2011 Optical Society of America

OCIS Codes
(160.5690) Materials : Rare-earth-doped materials
(190.5650) Nonlinear optics : Raman effect
(290.5910) Scattering : Scattering, stimulated Raman
(300.6450) Spectroscopy : Spectroscopy, Raman
(140.3945) Lasers and laser optics : Microcavities
(180.5655) Microscopy : Raman microscopy

ToC Category:
Scattering

History
Original Manuscript: February 24, 2011
Revised Manuscript: August 18, 2011
Manuscript Accepted: August 20, 2011
Published: September 16, 2011

Citation
Hiyori Uehara, Tetsuo Kishi, Tetsuji Yano, and Shuichi Shibata, "Enhancement of stimulated Raman scattering in terrace-microspheres," J. Opt. Soc. Am. B 28, 2436-2443 (2011)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-28-10-2436

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