Z-scan measurement of the nonlinear refractive index of Nd3+, Y3+-codoped CaF2 and SrF2 crystals

Yue Guo; Shunbin Lu; Liangbi Su; Chujun Zhao; Han Zhang; Shuangchun Wen

doi:10.1364/AO.54.000953

Z-scan measurement of the nonlinear refractive index of Nd³⁺, Y³⁺-codoped CaF₂ and SrF₂ crystals

Yue Guo, Shunbin Lu, Liangbi Su, Chujun Zhao, Han Zhang, and Shuangchun Wen

Applied Optics
Vol. 54,
Issue 4,
pp. 953-958
(2015)
•https://doi.org/10.1364/AO.54.000953

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Yue Guo, Shunbin Lu, Liangbi Su, Chujun Zhao, Han Zhang, and Shuangchun Wen, "Z-scan measurement of the nonlinear refractive index of Nd³⁺, Y³⁺-codoped CaF₂ and SrF₂ crystals," Appl. Opt. 54, 953-958 (2015)

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Related Topics
Table of Contents Category
- Nonlinear Optics
Optics & Photonics Topics
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The topics in this list come from the OSA Optics and Photonics Topics applied to this article.
Previously assigned OCIS codes
- Kerr effect (190.3270)
- Nonlinear optics, materials (190.4400)
- Self-action effects (190.5940)

About this Article
History
- Original Manuscript: September 15, 2014
- Revised Manuscript: December 29, 2014
- Manuscript Accepted: January 2, 2015
- Published: January 30, 2015

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Abstract

By performing the Z-scan measurements at 800 nm using a femtosecond pulsed laser, we are able to characterize the nonlinear refractive indices of Nd, Y codoped ${CaF}_{2}$ and ${SrF}_{2}$ crystals. Based on our measured results, we conclude that the doped fluoride crystal possesses a small nonlinear refractive index and the doping of ${Nd}^{3 +}$ and $Y^{3 +}$ ions in ${CaF}_{2}$ can change its third-order nonlinear index, but the contribution is minor. The doped fluoride crystal may have large potential to be developed as the next generation of gain material for a high-energy laser system.

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Material	Doped Type	$L$ (mm)	$L_{eff}$ (mm)	$n_{0}$	$γ (10^{- 20} m^{2} / w)$
${CaF}_{2}$	0.4% Nd, 10% Y	1.90	1.40	1.43	0.84
${CaF}_{2}$	0.6% Nd, 10% Y	1.90	1.40	1.43	0.93
${CaF}_{2}$	0.8% Nd, 10% Y	1.92	1.41	1.43	1.53
${CaF}_{2}$	1.0% Nd, 10% Y	1.90	1.40	1.43	0.98
${CaF}_{2}$	Pure ${CaF}_{2}$	1.94	1.42	1.43	1.05

${SrF}_{2}$	0.4% Nd, 10% Y	1.94	1.35	1.44	0.91
${SrF}_{2}$	0.45% Nd, 10% Y	1.94	1.35	1.44	1.28
${SrF}_{2}$	0.5% Nd, 10% Y	1.90	1.33	1.44	1.01
${SrF}_{2}$	0.8% Nd, 10% Y	1.94	1.35	1.44	1.09
${SrF}_{2}$	0.15% Nd, 5% Y	1.92	1.34	1.44	1.05
${SrF}_{2}$	0.43% Nd, 5% Y	1.90	1.33	1.44	1.34

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