ANALYSIS OF LASING PERFORMANCES OF Yb3+-DOPED YAG, FAP, KYW CRYSTALS
Huang Li-lei (黄莉蕾)a, Hong Zhi (洪治)b, Fang Da-wei (方达伟)a
a Optoelectronic Division, China Institute of Metrology, Hangzhou 310034, China; b State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China
Abstract The Yb3+ laser emitting at a 1.03μm wavelength has been evoking strong interest recently due to its advantages of long fluorescence lifetime, broad absorption band and the fact that it never shows concentration quenching. On the other hand, as a laser of three-level system it has, in general, a relatively high threshold power, which makes it important to seek some suitable host crystals to reduce this. Here, we present a comparison of the lasing performances of Yb3+-doped YAG [Y3Al5O12], FAP [Ca5(PO4)3F] and KYW [KY(WO4)2] crystals, including threshold power and slope efficiency, with those of the Nd:YAG laser based on the threshold formula of three-and four-level systems deduced by the authors. The results show that the Yb3+ laser can output a power larger than the Nd:YAG laser does in the case of comparably higher pumping power, if the length of the lasing rod and the concentration of the active ions satisfy some conditions. The theoretical results are also close to the experimental results reported.
Received: 05 February 2001
Revised: 05 May 2001
Accepted manuscript online:
PACS:
42.60.Jf
(Beam characteristics: profile, intensity, and power; spatial pattern formation)
Fund: Project supported by the Natural Science Foundation of Zhejiang Province, China (Grant No. 600087), and the State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, China (Grant No. LMOI-9913).
Cite this article:
Huang Li-lei (黄莉蕾), Hong Zhi (洪治), Fang Da-wei (方达伟) ANALYSIS OF LASING PERFORMANCES OF Yb3+-DOPED YAG, FAP, KYW CRYSTALS 2001 Chinese Physics 10 827
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