Analysis of the laser performance of Tm3+: ZBLAN glass at 1.47μm wavelength
Huang Li-Lei (黄莉蕾)a, Cao Guo-Xi (曹国熹)b, Zhang Lun (张伦)a, Luo Hong-Lei (罗宏雷)a
a Optoelectronic Division, China Institute of Metrology, Hangzhou 310034, China; b Shanghai Institute of Optics & Fine Mechanics, Chinese Academia of Sciences, Shanghai 201800, China
Abstract A formula for the threshold energy of a four-level-system laser in Tm$^{3+}$ doped fluoride glass is derived. The formula contains the parameters of the interaction between the ions and the up-conversion rate of the pump-light. It is discussed that the Tb$^{3+}$ ions and the up-conversion pump-light have an influence on the laser performance of Tm$^{3+}$ ions around 1.47μm wavelength. We draw the following two conclusions. (1) The laser threshold descends obviously due to the doping of Tb$^{3+}$ ions, but the descending gradually flattens out with the increase of the content of Tb$^{3+}$ ions. Its suitable content is (1－2)×10$^{20}$cm$^{-3}$. (2) When pump-lights both from the up-conversion and from the ground state excite simultaneously the single-doped Tm$^{3+}$ ions, the threshold energy can reduce and the output energy can increase. In this paper, the energy conversion efficiency from the up-conversion pump-light to the output energy of laser is estimated.
Received: 09 December 2003
Revised: 19 May 2004
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).
Cite this article:
Huang Li-Lei (黄莉蕾), Cao Guo-Xi (曹国熹), Zhang Lun (张伦), Luo Hong-Lei (罗宏雷) Analysis of the laser performance of Tm3+: ZBLAN glass at 1.47μm wavelength 2004 Chinese Physics 13 1728
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