Title
Discrimination Between Electronic And Thermal Contributions To The Nonlinear Refractive Index Of Sralf5:Cr+3
Abstract
In ion-doped solids there is a nonlinear refractive index n2 that is due to the polarizability difference ∆α between excited and ground states, the so-called population-lens (PL) effect. In addition, the thermal-lens (TL) effect is particularly important in fluoride materials, owing to their low thermal conductivity. We performed time-resolved Z-scan and mode-mismatched TL measurements at λ = 488 nm in SrAlF5: Cr+3. In this crystal the PL effect is faster than that of the TL, owing to its relatively short metastable lifetime (93 μs), and therefore we could temporally discriminate between these two contributions to the nonlinear refractive index. For the PL effect we measured n2 = (6.6 + 1.7i) × 10–11 cm2/W–1 and calculated ∆α = 3.1 × 10–26 cm3 and ∆σ = 1.7 × 10–20 cm2. From the TL measurements we obtained the thermal diffusivity D = 6.5 × 10–3 cm2 s–1 and estimated the thermal conductivity K = 1.7 × 10–2 Wcm–1K–1 and ds/dT = –8.5 × 10–7 K–1. © 1999 Optical Society of America.
Publication Date
1-1-1999
Publication Title
Journal of the Optical Society of America B: Optical Physics
Volume
16
Issue
3
Number of Pages
395-400
Document Type
Article
Personal Identifier
scopus
DOI Link
https://doi.org/10.1364/JOSAB.16.000395
Copyright Status
Unknown
Socpus ID
0347244336 (Scopus)
Source API URL
https://api.elsevier.com/content/abstract/scopus_id/0347244336
STARS Citation
Andrade, A. A.; Tenório, E.; and Catunda, T., "Discrimination Between Electronic And Thermal Contributions To The Nonlinear Refractive Index Of Sralf5:Cr+3" (1999). Scopus Export 1990s. 3833.
https://stars.library.ucf.edu/scopus1990/3833