Impact of Polarization Chromatic Aberration on Adaptive Optical Systems

Baiwei, 徐百威 Xu; Shijie, 胡诗杰 Hu; Jie, 李杰 Li; Junqi, 樊俊琪 Fan; Yi, 谭毅 Tan

doi:10.3788/lop57.150101

Cited by 1 publication

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“…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. The findings revealed that this type of polarization chromatic aberration encompasses out-of-focus aberration and a small amount of spherical aberration, with the out-of-focus aberration potentially reaching up to 1.14 rad [12]. Further contributing to the understanding of wavefront variances, Ke derived a formula for the overall undulation variance in the wavefront for beams of different wavelengths, highlighting differences in wavefront variance under identical transmission conditions [13].…”

Section: Introductionmentioning

confidence: 96%

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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Section: Introductionmentioning

confidence: 96%