Mechanism of dual-wavelength oscillation in Nd:YAG Q-switched laser

Yan-Feng, Lin; Zhang, Ge; Haiyong, Zhu; Huang, Chun; Ai-Hong, Li; Yong, Wei

doi:10.7498/aps.58.3909

Acta Phys. Sin.

2009

DOI: 10.7498/aps.58.3909

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Mechanism of dual-wavelength oscillation in Nd:YAG Q-switched laser

Lin Yan-Feng¹,

Ge Zhang²,

Zhu Haiyong³

et al.

Abstract: The oscillation mechanism of dual-wavelength Nd:YAG Q-switched laser with two-mirror resonator is studied on the basis of the rate equation. The characteristics of the dual-wavelength laser are discussed by analysing the competition process with different transmissivities. Results show that the oscillating time of the Q-switched pulse laser for 1319nm laser is delayed relative to that of 1064nm. The 1319nm Q-switched laser is formed finally from the first relaxation oscillation spike after the Q-switch open… Show more

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Cited by 4 publications

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Kinetic evolutionary behavior of catalysis-select migration

Yuan-Gang¹,

Zhen-Quan²,

Ke³

2012

Chinese Phys. B

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We propose a catalysis-select migration driven evolution model of two-species (A-and B-species) aggregates, where one unit of species A migrates to species B under the catalysts of species C, while under the catalysts of species D the reaction will become one unit of species B migrating to species A. Meanwhile the catalyst aggregates of species C perform self-coagulation, as do the species D aggregates. We study this catalysis-select migration driven kinetic aggregation phenomena using the generalized Smoluchowski rate equation approach with C species catalysis-select migration rate kernel K(k; i, j) = Kkij and D species catalysis-select migration rate kernel J(k; i, j) = Jkij. The kinetic evolution behaviour is found to be dominated by the competition between the catalysis-select immigration and emigration, in which the competition is between JD 0 and KC 0 (D 0 and C 0 are the initial numbers of the monomers of species D and C, respectively). When JD 0 − KC 0 > 0, the aggregate size distribution of species A satisfies the conventional scaling form and that of species B satisfies a modified scaling form. And in the case of JD 0 − KC 0 < 0, species A and B exchange their aggregate size distributions as in the above JD 0 − KC 0 > 0 case.

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Kinetic evolutionary behavior of catalysis-select migration

Yuan-Gang¹,

Zhen-Quan²,

Ke³

2012

Chinese Phys. B

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Finite element analysis and experimental studies on fracture splitting processing by Nd: YAG laser ablation

Ge¹,

Shen-hua²,

Wang³

et al. 2012

Acta Phys. Sin.

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Laser fracture splitting technology significantly improves the processing quality and efficiency of engine crankcase main bearing block. In order to research the splitting mechanism of ductile iron material fracture notch cauterized by Nd: YAG Laser, the FEAmodel of fracture splitting processing of engine crankcase main bearing block has been developed successfully. The splitting parameters of ductile iron material (QT500-7) main bearing block is analyzed. The numerical simulation results indicate that: among all the key parameters affecting the quality of fracture splitting, the effect of notch depth on fracture splitting load is more obvious than that of the notch opening angle and radius. The value of splitting load decreases rapidly with the increasing notch depth, while the splitting load increases with the increasing notch angle and radius. The optimum value of the notch depth, angle, and radius should be respectively at 0.5 mm, 60 o, and 0.2 mm. The results have been proved by experiments. The optimum parameters obtained from the ABAQUS simulation and experiments provide a numerical reference for significantly reducing the splitting load and optimizing the fracture splitting process, help to achieve the rapid development of engine block process and promote the green manufacture of automobile industry.

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Heterodyne research on times delay of laser pulses based on active Fabry-Perot cavity

Yan¹,

Weijiang²,

Ren³

et al. 2012

Acta Phys. Sin.

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The delay theoretical analysis result of single-longitudinal-mode pulse injected in active Fabry-Perot cavity has been obtained. The gain in Fabry-Perot cavity has been calculated and the numerical simulation result of output pulse has been obtained. The results show that when the energy of the pulse decreases at a certain value, the gain produced by increased pump particle population can compensate the loss in the cavity and the delay pulse can achieve steady state. In experiment, the active Fabry-Perot cavity is a Nd: YAG laser sided pumped by laser diode. For the pulse inputed externally, we achieve 140 pulses within 2 ups. Finally, the reference light is delayed using the active Fabry-Perot cavity. And we show the heterodyne experiment of signal light whose frequency shift generated by an acousto-optic modulation (AOM), and the experiment results accord with the frequency shift of the AOM and the error is less than 4%.

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Mechanism of dual-wavelength oscillation in Nd:YAG Q-switched laser

Cited by 4 publications

References 0 publications

Kinetic evolutionary behavior of catalysis-select migration

Kinetic evolutionary behavior of catalysis-select migration

Finite element analysis and experimental studies on fracture splitting processing by Nd: YAG laser ablation

Heterodyne research on times delay of laser pulses based on active Fabry-Perot cavity

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