Propagation of high-power partially coherent fibre laser beams in a real environment

doi:10.1088/1674-1056/20/9/094208

Abstract The propagation performance of high-power partially coherent fibre laser beams in a real environment is investigated and the theoretical model of a high-power fibre laser propagating in a real environment is established. The influence of a collimating system and thermal blooming is considered together with atmospheric turbulence and mechanical jitter. The laser energy concentration of partially coherent beams in the far field is calculated and analysed based on the theoretical model. It is shown that the propagation performance of partially coherent beams depends on the collimating system, atmospheric turbulence, mechanical jitter and thermal blooming. The propagation performance of partially coherent beams and fully coherent beams is studied and the results show that partially coherent beams are less sensitive to the influence of thermal blooming, which results in that the energy degeneration for partially coherent beams is only 50% of that for fully coherent beams. Both partially coherent beams and fully coherent beams become less sensitive to thermal blooming when the average structural constant of the refraction index fluctuations increases to 1.7 × 10^-14 m^-2/3. The investigation presents a reference for applications of a high-power fibre laser system.

Keywords: fibre lasers partially coherent beams Gaussian—Schell mode beams propagation

Received: 27 April 2011
Revised: 10 May 2011
Accepted manuscript online:

PACS:	42.55.Wd	(Fiber lasers)
	42.68.Ay	(Propagation, transmission, attenuation, and radiative transfer)
	42.68.Bz	(Atmospheric turbulence effects)

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Tao Ru-Mao(陶汝茂), Si Lei(司磊), Ma Yan-Xing(马阎星), Zou Yong-Chao(邹永超), and Zhou Pu(周朴) Propagation of high-power partially coherent fibre laser beams in a real environment 2011 Chin. Phys. B 20 094208

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Propagation of high-power partially coherent fibre laser beams in a real environment

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