Transient grating measurements of refractive-index changes in intensively pumped Yb-doped laser crystals

Transient grating measurements of refractive-index changes in intensively pumped Yb-doped laser crystals

Mechanisms of transient light-induced refractive-index changes in Yb-doped crystals Yb:KYW, Yb:KGW and Yb:YVO4 were studied. Relative amplitudes and lifetimes of the electronic component of phase gratings caused by the polarizability difference of the excited and unexcited Yb3+ ions and the thermal...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Vol. 86; no. 2; pp. 315 - 318
Main Authors: Ivakin, E.V., Sukhadolau, A.V., Antipov, O.L., Kuleshov, N.V.
Format: Journal Article
Language:English
Published: 01-01-2007
Subjects:
Crystals
Diffraction gratings
Excitation
Gratings (spectra)
Lasers
Pumps
Refraction
Wavelengths
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Summary:Mechanisms of transient light-induced refractive-index changes in Yb-doped crystals Yb:KYW, Yb:KGW and Yb:YVO4 were studied. Relative amplitudes and lifetimes of the electronic component of phase gratings caused by the polarizability difference of the excited and unexcited Yb3+ ions and the thermal component arising from thermalization of the pump energy were measured. Polarizability difference values of the ground 2 F 7/2 and the excited metastable 2 F 5/2 levels at the testing wavelength of 633 nm were determined for all crystals. The thermal diffusivity of the samples was estimated for selected directions of the thermal gradient. An athermal direction, along which the thermal component of refraction disappears, was found in Yb:KYW crystal under specific experimental conditions.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-006-2453-1