Studies of energy Strehl ratio of a collimated Gaussian beam in turbulent atmosphere

Yan, Yahui; Liu, Bingqi; Zhou, Bing; Wu, Dongsheng

doi:10.1117/12.2037787

SPIE Proceedings

2013

DOI: 10.1117/12.2037787

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Studies of energy Strehl ratio of a collimated Gaussian beam in turbulent atmosphere

Yahui Yan

Bingqi Liu

Bing Zhou

et al.

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Thermal blooming effect of laser beams propagating through seawater

Zhang

et al. 2017

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The thermal blooming effect of laser beams propagating through seawater is studied in detail by using the numerical simulation method. It is found that an increase of the salinity in the seawater causes the more severe thermal blooming. As compared with the wavelength, the absorption coefficient is the main factor that dominates the thermal blooming because the absorption coefficient is very high in the seawater. In the seawater the thermal blooming becomes more severe for the wavelength corresponding to the higher absorption coefficient. Furthermore, both the behavior of the thermal blooming effect and the main factor dominating the thermal blooming effect in the shallow sea region are different from those in the deep sea region. In the shallow sea region, the dependence of the thermal blooming on the depth is not monotonic as the time increases. However, in the deep sea region, the thermal blooming effect becomes more severe monotonously as the depth increases. The physical explanations for the main results obtained in this paper are presented.

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Thermal blooming effect of laser beams propagating through seawater

Zhang

et al. 2017

Opt. Express

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Thermal effect of high-power laser propagation in complex channels and its mitigation

Huang,

Xu,

Cheng

et al. 2023

Opt. Express

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We investigate the channel thermal effect resulting from the gas thermal blooming effect and mirror thermal deformation on the beam quality, and we propose a mitigation measure for blowing purge gases. Without gas blowing, the gas thermal blooming effect opposes the influence of mirror thermal deformation on the beam phase, resulting in significant phase distortion and offset. Noticeable distortion and divergence of the laser spot was also observed. After blowing purge gases, the beam phase was primarily determined by the mirror thermal deformation. Simultaneously, the mean-squared beam width decreased uniformly, improving the symmetry and energy concentration of the laser spot. However, the laser spot tended to stabilize when the gas velocity exceeded a certain threshold.

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Studies of energy Strehl ratio of a collimated Gaussian beam in turbulent atmosphere

Cited by 2 publications

References 0 publications

Thermal blooming effect of laser beams propagating through seawater

Thermal blooming effect of laser beams propagating through seawater

Thermal effect of high-power laser propagation in complex channels and its mitigation

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