Acta Optica Sinica, Volume. 6, Issue 4, 326(1986)
Analysis of a quasi-CW pumped intracavity frequency doubling YAG laser and its thermal effect
From the theory of SHG of Gaussian-like beams. We come to the conclusion th.it the power of the second-harmonic wave is approximately proportional to the square of the fundmentalwave power for frequency doubling of Gaussian-like beams with high conversion efficiences. Based on this, a new intracavity frequency doubling scheme of mixing-mode beam, i.e. quasi-CW pumping, is proposed. By using such scheme, the output power can be increased by a factor of 2, a fact that has been proven by theory and experiment. From thermal conduction equation, it has been found that the beam propagation parameter through a YAG rod under quasi-CW pumping is 22% lower· than that under CW pumping. If other factors are taken into account, the decrease will become 30%. By experimental njessureiiierite, we found that the thormal focal lengtli is increased and the divergence angle is decreased,as predicted by theory.
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YAO JIANQUAN, LI YU, XUI BIN, LIU SHUZEEN. Analysis of a quasi-CW pumped intracavity frequency doubling YAG laser and its thermal effect[J]. Acta Optica Sinica, 1986, 6(4): 326