Special Section on Optical Refrigeration and Radiation-Balanced Lasers

Czochralski crystal growth for laser cooling

[+] Author Affiliations
Giovanni Cittadino, Azzurra Volpi

Università di Pisa, Dipartimento di Fisica, Largo B. Pontecorvo 3, I-56127 Pisa, Italy

Alberto Di Lieto, Mauro Tonelli

Università di Pisa, Dipartimento di Fisica, Largo B. Pontecorvo 3, I-56127 Pisa, Italy

NEST Istituto di Nanoscienze-CNR, Piazza S. Silvestro 12, I-56127 Pisa, Italy

Opt. Eng. 56(1), 011107 (Oct 14, 2016). doi:10.1117/1.OE.56.1.011107
History: Received June 27, 2016; Accepted September 22, 2016
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Abstract.  In laser cooling of crystals in solid-state physics, it is really important to obtain crystals with a large size at a relatively fast growth rate and high-optical quality that is defect-free. To get that, one of the methods to grow crystals is the Czochralski technique. The Czochralski technique will be presented and, in particular, the furnaces in New Materials for Laser Applications Laboratories of Pisa for this application will be discussed. Afterward the parameters for the growth of crystal fluorides are depicted and it is shown how these parameters lead to build samples suitable for optical cooling. All processes that are necessary to avoid contamination inside crystals like OH ion and how to avoid reduction of Yb3+ to Yb2+ will be given. Spectroscopy of all samples will be treated in order to obtain the cooling parameters λf and αb for each sample. Afterward, an efficiency model will be discussed and the data efficiency of cooling obtained by a sample’s own crystals will be shown.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Giovanni Cittadino ; Azzurra Volpi ; Alberto Di Lieto and Mauro Tonelli
"Czochralski crystal growth for laser cooling", Opt. Eng. 56(1), 011107 (Oct 14, 2016). ; http://dx.doi.org/10.1117/1.OE.56.1.011107


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