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Diode-pumped high-efficiency Tm:YAG lasers

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Abstract

Eye-safe solid-state lasers that operate at 2 μm wavelength have many applications in medical, remote sensing and military technologies. With a 3-W CW laser-diode pumping, we obtained 760 mW 2.01 μm Tm:YAG laser under CW operation. The slope efficiency was 44% and the optical to optical efficiency reached 36%. In the acousto-optic Q-switched operation, laser pulses with the energy of 1.2mJ and 380 ns FWHM width have been achieved.

©1999 Optical Society of America

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Figures (5)

Fig. 1.
Fig. 1. The experimental setup of diode-pumped Tm:YAG laser.
Fig. 2.
Fig. 2. The output properties of the diode-pumped Tm:YAG lasers under different temperatures.
Fig. 3.
Fig. 3. The temperature dependence of the threshold power and the slope efficiency of the diode-pumped Tm:YAG lasers.
Fig. 4.
Fig. 4. The relationship between the Q-switched laser energy and the repetition-rate of the Tm:YAG lasers.
Fig. 5.
Fig. 5. Energy-level diagram of Tm:YAG lasers. The 2 μm laser is generated from the transition of the lower Stark level of 3F4 to the higher Stark level of 3H6. The cross-relaxation between 3H4-3F4 and 3H6-3F4 can produce two laser photons with one pump photon.

Equations (8)

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P p , th = πh v p ( ω l 2 + ω p 2 ) ( L + T + 2 N a 0 σl ) 4 στf η a η q .
η = T T + L v l v p η a η q dS dF .
dS dF = 1 + B fS 1 n ( 1 + fS ) f 2 F 2 0 [ exp ( x ) B a 2 fS ] exp ( 2 a 2 x ) [ 1 + fS exp ( a 2 x ) ] 2 .
a = ω p ω l .
x = 2 r 2 ω l .
B = 2 N a 0 σl T + L .
F = 4 P p τσ η a η q πh v p ω l 2 ( L + T ) .
S = 2 cστ Φ n π ω l 2 l .
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