Abstract
A theoretical analysis upon the four-dimensional (4D) spatio-temporal temperature dependent dynamics of 888 nm pumped Nd:YVO 4 dual-rod laser is established, which is valid in both continuous-wave (CW) and acousto-optic (AO) Q-switched pulse lasers conditions. Our model can accurately solve the 4D thermal generation and temperature evolution not only in the steady Q-switched state, but also in the first few unstable giant or dwarf pulses region. Factors including ground state depletion (GSD), energy transfer upconversion (ETU), fluorescence branching ratios, temperature-dependent cross sections and nonradiative relaxations processes are comprehensively considered for precisely estimating thermal effects, valid in both the steady pulse region and the unstable region at the beginning. Moreover, temporal and spatial temperature profiles and their coupling effect on output properties at different repetition-rates are discussed. Experiments of high-power high-repetition-rate 888 nm end-pumped Nd:YVO 4 dual-rod CW and AO Q-switched lasers are also firstly presented and the experimental results enjoy good consistency with our theory.
Highlights
As a new generation of in-band pumped neodymium lasers with a low-quantum-defect, 888 nm pumped Nd:YVO4 lasers have drawn much attention ever since it was first reported in 2006 [1], with its first high-power high-efficiency Master Oscillator Power-Amplifier (MOPA) system built in2007 [2]
Nd:YVO4 enjoys large absorption and stimulated emission cross sections that may lead to high gain but weak thermal property due to the low thermal conductivity and high energy transfer upconversion (ETU) coefficient
An 888 nm pumping scheme is an effective way to compensate thermal effect for output properties upgrading in Nd:YVO4 laser, which has been widely used in Q-switched [3], mode-locked [4,5] oscillators, pulse amplifiers [6,7] and optical parametric technology [8]
Summary
As a new generation of in-band pumped neodymium lasers with a low-quantum-defect, 888 nm pumped Nd:YVO4 lasers have drawn much attention ever since it was first reported in 2006 [1], with its first high-power high-efficiency Master Oscillator Power-Amplifier (MOPA) system built in2007 [2]. An 888 nm pumping scheme is an effective way to compensate thermal effect for output properties upgrading in Nd:YVO4 laser, which has been widely used in Q-switched [3], mode-locked [4,5] oscillators, pulse amplifiers [6,7] and optical parametric technology [8]. High-power Q-switched neodymium pulse lasers are widely used in laser machining manufacture [9] and the thermal effect is a key factor. It is significant to make a complete thermal analysis model in the 888 nm pumped Nd:YVO4 high-power Q-switched pulse laser. In 2010, Yan et al [13] used a dual-rod scheme in acousto-optic Q-switched 808 nm pumped Nd:YVO4 and Nd:YAG lasers and made the comparative
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