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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. 26, Iss. 4 — Apr. 1, 2009
  • pp: 620–626

Sellmeier equation for doubly Er Mg -doped congruent Li Nb O 3 crystals

De-Long Zhang, Qing-Zhong Yang, Ping-Rang Hua, Hong-Li Liu, Yu-Ming Cui, Liang Sun, Yu-Heng Xu, and Edwin Yue-Bun Pun  »View Author Affiliations


JOSA B, Vol. 26, Issue 4, pp. 620-626 (2009)
http://dx.doi.org/10.1364/JOSAB.26.000620


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Abstract

Refractive indices of congruent Li Nb O 3 crystals codoped with 0.5 mol % Er 2 O 3 and 0 5.0     m o l % MgO were measured at room temperature in a wavelength range from 473 to 1536 nm using critical angle measurement and minimum deviation methods. For reference, measurements by the critical angle method were also performed on a congruent Li Nb O 3 and a congruent MgO ( 5 mol % ) : Li Nb O 3 . The measured data are compared with previously reported theoretical and/or experimental results of pure and MgO-doped Li Nb O 3 , especially with the results predicted by the MgO content-related Sellmeier equation (SE) reported by Schlarb and Betzler. It is shown that the Schlarb and Betzler SE consistently predicts a lower index, by as much as 4 × 10 3 , than what is actually measured by the authors for both congruent Li Nb O 3 and for Mg O : Li Nb O 3 , whether it is codoped with Er or not. To check the Er doping effect, measurements by the critical angle method were also performed on some congruent Li Nb O 3 crystals singly doped with 0 1.0 mol % Er 2 O 3 . The results show that Er doping has no measurable effect. It is concluded that there may be a systematic error as one uses the Schlarb and Betzler SE to predict the index of the undoped, only MgO-doped, and Er Mg -codoped crystals. The Schlarb and Betzler SE parameters are refined to fit our experimental data. The corrected version of the SE suitable for Mg O : Li Nb O 3 with or without Er doping is given.

© 2009 Optical Society of America

OCIS Codes
(160.3730) Materials : Lithium niobate
(260.1440) Physical optics : Birefringence
(260.2030) Physical optics : Dispersion

ToC Category:
Physical Optics

History
Original Manuscript: August 18, 2008
Revised Manuscript: January 14, 2009
Manuscript Accepted: January 14, 2009
Published: March 6, 2009

Citation
De-Long Zhang, Qing-Zhong Yang, Ping-Rang Hua, Hong-Li Liu, Yu-Ming Cui, Liang Sun, Yu-Heng Xu, and Edwin Yue-Bun Pun, "Sellmeier equation for doubly Er/Mg-doped congruent LiNbO3 crystals," J. Opt. Soc. Am. B 26, 620-626 (2009)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-26-4-620

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