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Proceedings Paper

Optical properties of CaF[sub]2[/sub] and Yb[sup]3+[/sup]:CaF[sub]2[/sub] for laser applications
Author(s): Jörg Stäblein; Karin Pöhl; Andreas Weisleder; Gordon v. d. Gönna; Thomas Töpfer; Joachim Hein; Mathias Siebold
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Paper Abstract

Highly transparent CaF2 has found many applications from the deep UV- to the IR-range. The optical quality and the laser damage threshold are influenced by the purity and the real structure of the crystal. Both properties strongly depend on raw material quality and growth conditions. Production of pure CaF2 single crystals and their characterization are described. The authors´ process enables to produce crystals up to diameters of 425mm with an internal transmittance of higher than 99.7% at 193nm (thickness 100mm) and a homogeneity of refractive index below 1ppm for diameters >200mm. A new approach is the growth of Yb3+ doped CaF2 crystals in such furnaces dedicated to large volumes. The advantage of higher volume is a better homogeneity of the dopant concentration and the diffractive index in the crystal. Critical mechanical properties especially of the doped fluoride have to be taken into account. The growth process has to be adopted carefully to avoid stress, cracks and other crystal defects. Data of refractive index homogeneity and stress birefringence are presented. A comparison of doped and undoped crystals is made and an outlook for further improvement is given. The segregation coefficient of the dopant which is important to be near to one is reported. The ratio Yb3+ /Yb2+ is characterized spectroscopically. Differences between top and bottom of the crystal are shown. Results of the real structure evaluation are presented. The most critical feature for high energy applications which are strength and concentration of small angle grain boundaries are compared with that of undoped crystals.

Paper Details

Date Published: 9 June 2011
PDF: 5 pages
Proc. SPIE 8080, Diode-Pumped High Energy and High Power Lasers; ELI: Ultrarelativistic Laser-Matter Interactions and Petawatt Photonics; and HiPER: the European Pathway to Laser Energy, 808002 (9 June 2011); doi: 10.1117/12.886830
Show Author Affiliations
Jörg Stäblein, Hellma Materials GmbH & Co. KG (Germany)
Karin Pöhl, Hellma Materials GmbH & Co. KG (Germany)
Andreas Weisleder, Hellma Materials GmbH & Co. KG (Germany)
Gordon v. d. Gönna, Hellma Materials GmbH & Co. KG (Germany)
Thomas Töpfer, Hellma Materials GmbH & Co. KG (Germany)
Joachim Hein, Friedrich-Schiller-Univ. Jena (Germany)
Mathias Siebold, Forschungszentrum Dresden-Rossendorf e.V. (Germany)


Published in SPIE Proceedings Vol. 8080:
Diode-Pumped High Energy and High Power Lasers; ELI: Ultrarelativistic Laser-Matter Interactions and Petawatt Photonics; and HiPER: the European Pathway to Laser Energy
Luis O. Silva; Georg Korn; Leonida Antonio Gizzi; Chris Edwards; Joachim Hein, Editor(s)

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