Journal
LASER PHYSICS LETTERS
Volume 17, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1612-202X/ab9f3f
Keywords
single crystal fiber; Er ions; mid-infrared laser
Categories
Funding
- National Natural Science Foundation of China (NSFC) [61635012, 11974220]
- National Key Research and Development Program of China [2016YFB0402101]
- Strategic Priority Program of the Chinese Academy of Sciences [XDB16030000]
- CAS Interdisciplinary Innovation Team
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Rare-earth-doped single-crystal fibers are promising for use in developing high-power lasers due to their improved thermal management and excellent optical properties. In this work, Er-doped CaF(2)single-crystal fibers of good optical quality were successfully grown by a modified temperature gradient technique method. For the characteristic clustering effect of trivalent rare earth ions within fluorite crystals, a high-efficiency 2759.1 nm laser was obtained in a 1 at.% Er-doped CaF(2)crystal fiber. Moreover, even in an extremely lightly doped crystal fiber with a concentration of 0.5 at.%, a continuous-wave (CW) 2758.2 nm laser with a slope efficiency of 20% was achieved. Without the cascade lasing, a similar to 2.8 mu m CW laser operation pumped by a laser diode was first demonstrated in the case of a Er(3+)doping concentration below 1 at.%. The results suggest that Er-doped CaF(2)single-crystal fibers are promising for mid-infrared lasers.
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