Progress in rare-earth-doped nanocrystalline glass-ceramics for laser cooling

Kummara Venkata Krishnaiah; Yannick Ledemi; Elton Soares de Lima Filho; Sebastien Loranger; Galina Nemova; Younes Messaddeq; Raman Kashyap

doi:10.1117/12.2213133

23 March 2016 Progress in rare-earth-doped nanocrystalline glass-ceramics for laser cooling

Kummara Venkata Krishnaiah, Yannick Ledemi, Elton Soares de Lima Filho, Sebastien Loranger, Galina Nemova, Younes Messaddeq, Raman Kashyap

Author Affiliations +

Proceedings Volume 9765, Optical and Electronic Cooling of Solids; 97650L (2016) https://doi.org/10.1117/12.2213133
Event: SPIE OPTO, 2016, San Francisco, California, United States

Abstract

Laser cooling with anti-Stokes fluorescencewas predicted by Pringsheim in 1929, but for solids was only demonstrated in 1995. There are many difficulties which have hindered laser assisted cooling, principally the chemical purity of a sample and the availability of suitable hosts. Recent progress has seen the cooled temperature plummet to 93K in Yb:YLF. One of the challenges for laser cooling to become ubiquitous, is incorporating the rare-earthcooling ion in a more easily engineered material, rather than a pure crystalline host. Rare-earth-doped nanocrystalline glass-ceramics were first developed by Wang and Ohwaki for enhanced luminescence and mechanical properties compared to their parent glasses. Our work has focused on creating a nanocrystalline environment for the cooling ion, in an easy to engineer glass. The glasses with composition 30SiO₂-15Al²O₃-27CdF₂-22PbF₂-4YF₃-2YbF₃ (mol%), have been prepared by the conventional melt-quenching technique. By a simple post fabrication thermal treatment, the rare-earth ions are embedded in the crystalline phase within the glass matrix. Nanocrystals with various sizes and rare-earth concentrations have been fabricated and their photoluminescence properties assessed in detail. These materials show close to unity photoluminescence quantum yield (PLQY) when pumped above the band. However, they exhibit strong up-conversion into the blue, characteristic of Tm trace impurity whose presence was confirmed. The purification of the starting materials is underway to reduce the background loss to demonstrate laser cooling. Progress in the development of these nano-glass-ceramics and their experimental characterization will be discussed.

Citation Download Citation

Kummara Venkata Krishnaiah, Yannick Ledemi, Elton Soares de Lima Filho, Sebastien Loranger, Galina Nemova, Younes Messaddeq, and Raman Kashyap "Progress in rare-earth-doped nanocrystalline glass-ceramics for laser cooling", Proc. SPIE 9765, Optical and Electronic Cooling of Solids, 97650L (23 March 2016); https://doi.org/10.1117/12.2213133

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available