Influence of thermal blooming on the beam quality of an array of Hermite–Gaussian beams propagating in the atmosphere

Ding, Zhoulin; Li, Xiaoqing; Cao, Jianyong; Ji, Xiaoling

doi:10.1364/ao.405980

Cited by 17 publications

(7 citation statements)

References 22 publications

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“…Thermal blooming was shown to become less severe as the spatial coherence of a partially coherent beam array was reduced [22]. Recently, we have also found that thermal blooming weakens as the mode order or the inverse radial fill factor of an array of Hermite-Gaussian beams is increased [23], or as the truncation parameter of a Gaussian (GS) beam is decreased [24]. However, the combined laser beams propagating in the thermal atmosphere are only for one single wavelength, but not considering SBC [21][22][23].…”

Section: Introductionmentioning

confidence: 93%

“…Recently, we have also found that thermal blooming weakens as the mode order or the inverse radial fill factor of an array of Hermite-Gaussian beams is increased [23], or as the truncation parameter of a Gaussian (GS) beam is decreased [24]. However, the combined laser beams propagating in the thermal atmosphere are only for one single wavelength, but not considering SBC [21][22][23]. As far as we know, the earlier studies do not include any assessment of thermal blooming when an SBC beam propagates in the atmosphere.…”

Section: Introductionmentioning

confidence: 96%

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Wavelength selection for spectrally combined laser beams propagating in free space and the atmosphere

Li¹,

Yang²,

Ding³

et al. 2023

J. Opt.

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Wavelength selection has a major impact on spectral beam combining (SBC) of laser beams that propagate in free space and in the atmosphere. We derive analytical expressions for the intensity and four characteristic quality parameters of free-space SBC beams. We show that the peak intensity, the mean-square beam width, and the M2 factor of an SBC beam at the target are all larger than those of one single laser beam of the same power and average wavelength. The peak intensity can be made higher by increasing the wavelength spacing but reducing the mean wavelength. However, when an SBC laser beam propagates in the atmosphere, the beam quality depends on the absorption coeﬃcient of the multi-wavelength ﬁeld due to thermal blooming. A thermal distortion number is introduced for an SBC beam and its validity is conﬁrmed. We show that the power proportion of a high-absorption element within an SBC beam should be as low as possible to reduce the thermal blooming eﬀect.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 96%

Wavelength selection for spectrally combined laser beams propagating in free space and the atmosphere

Li¹,

Yang²,

Ding³

et al. 2023

J. Opt.

Self Cite

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show abstract

“…Based on the numerical simulation, the scaling laws of beam expansion [11] and phase compensation [12] have been investigated. In recent years, Ji and et al have theoretically studied the thermal blooming effect of laser beams propagating through the atmosphere [13,14] and seawater [15] . Zhang and et al have numerically analyzed the beam deviation induced by thermal blooming effect when high-energy laser propagating upwards in the atmosphere [16] .…”

Section: Introductionmentioning

confidence: 99%

Study on phase change of Gaussian beam induced by thermal blooming effect

rui

Zou

et al. 2023

Ninth Symposium on Novel Photoelectronic Detection Technology and Applications

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When a high-power laser beam propagates in an absorbing medium, the thermal blooming effect cause the phase distortion of the beam, which will seriously affect the beam quality. In this paper, with the help of the laser propagation theory and thermo-optic coefficient experiment, the phase change of Gaussian beam propagating in various concentrations of ink-ethanol is investigated. The result shows that the phase change is proportional to the input power, which may provide the theoretical and experimental basis for phase compensation, and have potential applications in the adaptive optics, underwater optical communications, biological tissue imaging and other related field.

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“…Recently, laser array beams have become a hot topic in practical applications owing to the wide potential applications in communication, imaging, power beaming, illumination, and so on. [15][16][17][18][19][20] In last decades, the scintillation, statistics, beam spreading and beam quality of array beams in the atmosphere have been reported. [21][22][23][24][25][26][27][28] On the other hand, it has been shown that partially coherent beams are less sensitive to the effect of turbulence than fully coherent beams.…”

Section: Introductionmentioning

confidence: 99%

The Combined Effect of Jet and Atmospheric Turbulence on the Propagation of Airborne Partially Coherent Array Beams

et al. 2022

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The exhaust from engines close to the fuselage can cause extreme turbulence and have a significant impact on the performance of airborne laser systems. In this paper, the combined effect of the jet engine and atmospheric turbulence on propagation of a Gaussian Schell-model (GSM) array beam over long distances is studied in detail. Based on the two-step propagation method, the analytical expressions of the cross-spectral density (CSD) function, mean-squared beam width and spectral degree of spatial coherence (DOC) of GSM array beams are derived. It is shown that the jet engine turbulence has a significant effect on the beam broadening even at a very short distance. As the propagation distance in the jet engine turbulence increases, the beam width is less effected by the spatial coherence. Meanwhile, the resistance of lower spatially coherent beam to the turbulence increases as the distance of the jet engine turbulence or the strength of the atmospheric turbulence increases. It is demonstrated that the effect of jet engine turbulence on the beam spreading can be equivalent to moderate or even severe atmospheric turbulence. Moreover, the DOC is a function with oscillatory phenomenon when the propagation distance is short or the strength of turbulence is low.

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Influence of thermal blooming on the beam quality of an array of Hermite–Gaussian beams propagating in the atmosphere

Cited by 17 publications

References 22 publications

Wavelength selection for spectrally combined laser beams propagating in free space and the atmosphere

Wavelength selection for spectrally combined laser beams propagating in free space and the atmosphere

Study on phase change of Gaussian beam induced by thermal blooming effect

The Combined Effect of Jet and Atmospheric Turbulence on the Propagation of Airborne Partially Coherent Array Beams

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