Investigation of dual-wavelength laser beam propagation along the in-door atmospheric path

Gorelaya, Alina V.; Shubenkova, Elena; Dmitriev, D. I.; Дмитриева, Анна Дмитриевна; Kudryashov, Alexis; Lovchiy, Igor; Shalymov, Egor V.; Sheldakova, Julia; Tsvetkov, A. D.; Venediktov, Dmitriy V.; Venediktov, Vladimir Yu.

doi:10.1117/12.2194332

Cited by 5 publications

(5 citation statements)

References 1 publication

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“…By substituting Equation (11) into Equation ( 7) and transforming, Equation ( 7) can be expressed as:…”

Section: Differential Analysis Of Beam Wavefront Aberrations At Diffe...mentioning

confidence: 99%

“…In 2015, Gorelaya conducted an indoor space laser communication experimental link featuring the co-optical transmission of signal and beacon lights. Using a Shack-Hartmann wavefront sensor at the receiving end, Gorelaya measured the wavefront phase aberrations of optical signals at wavelengths of 530 nm and 1060 nm [11]. Additionally, in 2020, Xu scrutinized the polarization chromatic aberration between 1300 nm and 589 nm beams arising from the surface coating of the optical original in the Cassegrain optical antenna.…”

Section: Introductionmentioning

confidence: 99%

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Study on the Difference in Wavefront Distortion on Beams Caused by Wavelength Differences in the Strong Turbulence Region

Han,

Ke,

Liang

2024

Applied Sciences

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In free-space optical communication, the transmission of signal light and beacon light of differing wavelengths through the same atmospheric channel encounters variations in how the atmospheric refractive index absorbs and scatters light. This leads to distinct degrees of wavefront aberrations between the signal and beacon lights. In this study, we employed statistical optics to derive wavefront phase structure functions for both signal and beacon lights under conditions of strong turbulence. We explored how wavefront distortion varies among beams of different wavelengths after propagation through such turbulent conditions. Our findings revealed that as the turbulence outer scale escalates, the difference in wavefront distortion between signal and beacon lights stabilizes after an initial increase, assuming constant wavelengths. Furthermore, we observed significant changes in the relative wavefront aberrations when the inner scale of turbulence surpasses the separation between two points on the receiving apertures. As the disparity in wavelength decreases, so does the difference in wavefront aberrations. Finally, we propose a method for correcting wavefront aberrations based on coefficients of Zernike polynomials corresponding to beams with different wavelengths. This approach is validated through simulation and experimentation, demonstrating an 11% enhancement in the signal-to-optical Strehl ratio and a 0.072 increase in spot energy after the addition of correction coefficients compared with before their inclusion. These results solidify the efficacy of our method in improving adaptive optics correction accuracy.

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“…By substituting Equation (11) into Equation ( 7) and transforming, Equation ( 7) can be expressed as:…”

Section: Differential Analysis Of Beam Wavefront Aberrations At Diffe...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the Difference in Wavefront Distortion on Beams Caused by Wavelength Differences in the Strong Turbulence Region

Han,

Ke,

Liang

2024

Applied Sciences

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“…By comparing the measurement results, they found a certain correlation between the wavefront distortion of two beams with different wavelengths. The degree of distortion increased with an increase in the transmission path distance [19].…”

Section: Introductionmentioning

confidence: 95%

Study on the Difference of Wavefront Distortion on Beams Caused by Wavelength Differences in Weak Turbulence Region

Kang

et al. 2023

Photonics

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In dual-wavelength free-space optical communication systems, the wavefront distortion differences caused by the wavelength difference of the signal and beacon lights cannot be completely corrected. In this study, according to the method of geometric optics, the relationship between the wavefront phases of the signal and beacon lights is analyzed by establishing a mathematical model of the cross-correlation ratio of the arrival-angle fluctuation and phase relationship of different Gaussian-beam wavelengths under weak turbulence near the surface. The numerical results show that after Gaussian beams of different wavelengths propagate through the same atmospheric channel, the cross-correlation number of the arrival-angle fluctuation decreases with an increase in the wavelength difference, waist radius, and turbulence intensity, and increases with an increase in propagation distance. The beam-wavefront phase difference increases with an increasing wavelength difference. Finally, a wavefront distortion correction experiment of a dual-wavelength adaptive optical system verified the correctness of the wavefront phase-difference relationship between the signal light and beacon light established in this study.

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“…Ishimaru [12] used the correlation function of the log amplitude of the dual-wavelength beam and the time power spectral density of the phase to analyze the temporal correlation of the wavefront of the dual-wavelength beam. Gorelaya et al [13] conducted a wavefront measurement experiment in an indoor turbulence pool with dual-wavelength beam transmission on the same transmission path. The measurement results show that the wavefront distortion of the short-wavelength beam is greater than that of the long-wavelength beam under the same turbulent environment.…”

Section: Introductionmentioning

confidence: 99%

“…is the refractive index structure constant corresponding to λ 1 , 2 2 n C is the refractive index structure constant corresponding to λ 2 , and A, B, C, and D are environmental factors given by Equations(13),(14),(15), and (16):…”

mentioning

confidence: 99%

Correcting Wavefront Distortion of Dual-Wavelength Beams Due to Atmospheric Turbulence with a Correction Coefficient

Ke¹,

Chen²

2020

OPJ

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In order to improve the correction effect of the adaptive optical system in coherent optical communication, we investigate the relative distortion between the wavefronts of different wavelengths of the beams transmitted on the near-ground horizontal atmospheric turbulent links emitted by coherent optical communication system. And the situation is analyzed when the wavelength corresponding to the wavefront detected by the wavefront detector and the wavelength corrected by the deformed mirror are different, the influence of the wavelength factor on the adaptive optical system correction. We use a series of trigonometric functions and the Hankel transformation to derive the corrected residual variance and the Strehl ratio between the wavefront distortions of the wavelengths of the dual-wavelength combined beam in atmospheric turbulence. In relation to the parameters of the turbulent environment, the ensemble average of the wavefront difference corresponding to different wavelengths the derived is proposed as the coefficient to correct the dual-wavelength adaptive optical system. The results show that the statistic of the turbulence internal scale has a major influence on the difference between the wavefronts. By adding the correction coefficient, the signal light's wavefront of the coherent optical communication system can be corrected more effectively by the dual-wavelength adaptive optical closure.

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Investigation of dual-wavelength laser beam propagation along the in-door atmospheric path

Cited by 5 publications

References 1 publication

Study on the Difference in Wavefront Distortion on Beams Caused by Wavelength Differences in the Strong Turbulence Region

Study on the Difference in Wavefront Distortion on Beams Caused by Wavelength Differences in the Strong Turbulence Region

Study on the Difference of Wavefront Distortion on Beams Caused by Wavelength Differences in Weak Turbulence Region

Correcting Wavefront Distortion of Dual-Wavelength Beams Due to Atmospheric Turbulence with a Correction Coefficient

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