TY - JOUR
AU - Inoue, Hiroyuki
AB - 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:Yb 3+ identifies Cu 2+ , Fe 2+ , Co 2+ , and OH as the most problematic species and establishes a 1-10 ppm upper limit for each of these impurities for a practical ZBLAN:Yb 3+ 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:Yb 3+ that exploits the potential of available purification techniques in an aqueous intermediate step. Such high-performance ZBLAN:Yb 3+ 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.
TI - Laser cooling of rare-earth doped solids: the next step
JF - Proceedings of SPIE
DO - 10.1117/12.663663
DA - 2006-02-09
UR - https://www.deepdyve.com/lp/spie/laser-cooling-of-rare-earth-doped-solids-the-next-step-gqzjorMw5M
SP - 61300N
EP - 61300N-14
VL - 6130
IS - 1
DP - DeepDyve
ER -