Laser cooling of rare-earth doped solids: the next step

Markus P. Hehlen; Richard I Epstein; Hiroyuki Inoue

doi:10.1117/12.663663

21 March 2006 Laser cooling of rare-earth doped solids: the next step

Markus P. Hehlen, Richard I Epstein, Hiroyuki Inoue

Proceedings Volume 6130, Advanced Optical and Quantum Memories and Computing III; 61300N (2006) https://doi.org/10.1117/12.663663
Event: Integrated Optoelectronic Devices 2006, 2006, San Jose, California, United States

Abstract

A quantitative description of optical refrigeration in rare-earth doped solids in the presence of impurities is presented. The model includes the competition of radiative processes with energy migration, energy transfer to transition-metal ions, and multiphonon relaxation. The cooling efficiency is sensitive to the presence of both 3d metal ions with absorption in the near infrared and high-frequency vibrational impurities such as OH. A case study of ZBLAN:Yb³⁺ identifies Cu²⁺, Fe²⁺, Co²⁺, and OH as the most problematic species and establishes a 1-10 ppm upper limit for each of these impurities for a practical ZBLAN:Yb³⁺ optical cryocooler operating at 100-150 K to become feasible. The model results form the basis for an advanced strategy for the synthesis of high-purity ZBLAN:Yb³⁺ that exploits the potential of available purification techniques in an aqueous intermediate step. Such high-performance ZBLAN:Yb³⁺ is expected to enable optical cryocoolers with ~1% overall efficiency at 120 K and find use in a wide range of applications that require highly reliable, noise-free, and vibration-free cooling of electronic and opto-electronic components.

Citation Download Citation

Markus P. Hehlen, Richard I Epstein, and Hiroyuki Inoue "Laser cooling of rare-earth doped solids: the next step", Proc. SPIE 6130, Advanced Optical and Quantum Memories and Computing III, 61300N (21 March 2006); https://doi.org/10.1117/12.663663

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