Analysis of the laser performance of Tm3+, Tb3+(Ho3+):YVO4 crystals at ～1.5μm wavelength

doi:10.1088/1009-1963/12/12/014

Abstract

Abstract The absorption spectra of Tb,Tm:YVO

_{4}

and Ho,Tm:YVO

_{4}

are measured. The radiant and non-radiant transition probabilities from higher level to lower level,

A_{i, j}

and

ω_{i, j}

, and the cross-elaxation probability are calculated in virtue of Judd－Ofelt and Dexter theories. The fluorescence lifetime of Tm

^{3 +}

in the Tb

^{3 +}

(or Ho

^{3 +}

) co-doped crystal is calculated. It indicates that the lifetime of initial level

^{3}

H

_{4}

of the laser transition can be shorter than that of terminal level

^{3}

F

_{4}

of the transition if the atomic percentage of Tb

^{3 +}

(or Ho

^{3 +}

) ions is bigger than about 1 at%: namely, by means of the co-doping Tb

^{3 +}

(or Ho

^{3 +}

) ions the self-termination phenomenon of laser light can be eliminated. Inserting the optic parameters to the formula deduced here on the laser threshold power

P_{t h}^{(4)}

and the slope efficiency

η_{s}^{(4)}

of the four-energy-level system, we obtain the relationship of threshold power

P_{t h}^{(4)}

to the concentration of Tm

^{3 +}

ions and discuss the effect of Tb

^{3 +}

(or Ho

^{3 +}

) ion concentration on the laser threshold power

P_{t h}^{(4)}

around 1.5μm wavelength. The result shows that Tb,Tm:YVO

_{4}

crystal is a better choice to make the laser at

\sim 1.5

μm wavelength than Ho,Tm:YVO

_{4}

crystal. We give the appropriate composition of (1－2) at% Tb, (1－2) at% Tm:YVO

_{4}

, just for reference.

Keywords: Tb(Ho) Tm:YVO

_{4}

crystal fluorescence lifetime lasing at around 1.5μm wavelength self-termination phenomenon of laser

Received: 14 March 2003
Revised: 23 April 2003
Accepted manuscript online:

PACS:	42.60.Jf	(Beam characteristics: profile, intensity, and power; spatial pattern formation)
	42.55.Rz	(Doped-insulator lasers and other solid state lasers)
	42.70.Hj	(Laser materials)
	78.55.Hx	(Other solid inorganic materials)
	32.70.Cs	(Oscillator strengths, lifetimes, transition moments)
	32.50.+d	(Fluorescence, phosphorescence (including quenching))

Fund: Project supported by the Foundation of the Natural Science of Zhejiang Province, China(Grant No 600087), and by the State Key Laboratory of LMOI-013 Zhejiang University, China.

Cite this article:

Huang Li-Lei (黄莉蕾), Fu Yan-Bin (付晏彬), Wu Liang-Neng (邬良能) Analysis of the laser performance of Tm³⁺, Tb³⁺(Ho³⁺):YVO₄ crystals at ～1.5μm wavelength 2003 Chinese Physics 12 1417

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Analysis of the laser performance of Tm3+, Tb3+(Ho3+):YVO4 crystals at ～1.5μm wavelength

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Analysis of the laser performance of Tm³⁺, Tb³⁺(Ho³⁺):YVO₄ crystals at ～1.5μm wavelength