Abstract
The propagation characteristics of a Hermite-Gaussian correlated Schell-model (HGCSM) beam in the turbulence of biological tissue are analyzed. The average intensity, spectral degree of coherence, and the dependence of the propagation factors on the beam orders, transverse coherence width, fractal dimension, characteristic length of heterogeneity, and small length-scale factor are numerically investigated. It is shown that the HGCSM beam does not exhibit self-splitting properties on propagation in tissues due to the strong turbulence in the refractive index of biological tissue. The larger the beam orders, the fractal dimension, and the small length-scale factor are, or the smaller the transverse coherence width and the characteristic length of heterogeneity are, the smaller the normalized propagation factor is, and the better the beam quality of HGCSM beams in turbulence of biological tissue is. Moreover, under the same condition, the HGCSM beam is less affected by turbulence than of Gaussian Schell-model (GSM) beam. It is expected that the results obtained in this paper may be useful for the application of partially coherent beams in tissue imaging and biomedical diagnosis.
Highlights
In recent years, the propagation of laser beams in biological tissues has been a hot topic of tissue optics research, which plays an important role in medical diagnosis and treatment [1,2,3,4,5,6,7,8]
Yu and Zhang investigated the beam spreading and wander of a partially coherent Lommel-Gaussian beam propagation in turbulent tissue using a power spectrum model of the tissue considering the structural length-scale and fractal dimension, and the results reveal that laser beam with loworder vortex suffers less turbulence interference [17]
This analysis suggests that the larger the fractal dimension and the small length-scale factor are, or the smaller the characteristic length of heterogeneity is, the weaker tissue turbulence is, the smaller the normalized propagation factor is, and the better the beam quality of Hermite-Gaussian correlated Schell-model (HGCSM) beams propagating in turbulent biological tissue is
Summary
The propagation of laser beams in biological tissues has been a hot topic of tissue optics research, which plays an important role in medical diagnosis and treatment [1,2,3,4,5,6,7,8]. To investigate the influence of beam parameters on the beam quality of HGCSM beams in biological tissues, Figure 5 shows the normalized propagation factors of HGCSM beams vs propagation distance in turbulent biological tissue for different values of the beam orders m, n, and the transverse coherence. The larger the beam order or the smaller the transverse coherence width, the smaller the influence of refractive-index fluctuations of the biological tissue on the HGCSM beams This analysis suggests that the larger the fractal dimension and the small length-scale factor are, or the smaller the characteristic length of heterogeneity is, the weaker tissue turbulence is, the smaller the normalized propagation factor is, and the better the beam quality of HGCSM beams propagating in turbulent biological tissue is
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