To realize optical wireless power transmission, atmospheric propagation of eye-safe wavelength (1.57μm) laser beams was theoretically investigated. Laser beams are affected by the presence of water vapor and aerosols which absorb and scatter the laser energy. The scattering coefficients of water molecules and aerosols were estimated to be about 6.3 × 10-7 and 5.6 × 10-5 m-1, respectively, at wavelength (λ0) of 1.57μm. Furthermore, the absorption coefficients of moist air at 30% relative humidity and aerosols were estimated to be about 6.16 × 10-3 and 2.52 × 10-5 m-1, respectively, at λ0 = 1.57μm. Then simulation of laser beam propagation in the moist atmosphere at λ0 = 1.57μm was performed using these coefficients. Under the condition of no wind, the beam intensity decreases rapidly with increasing the length z and the rate of decrease slows down as the beam radius (ω) increases. When zh is defined as the z where the normalized intensity is halved, the zh (= 25 m) at ω = 20 mm when input power P = 10 W is about three times longer than that (= 8 m) when P = 100 W. This result indicates that the thermal distortion of laser beams due to accumulated heat around the z axis becomes more conspicuous as the optical power increases. The effect of this thermal beam distortion can be weakened when the laser beam is subject to crosswinds. Under the condition of gentle uniform wind with wind velocity v = 5 m/s, propagation of laser beams with ω = 20 mm was studied when P = 100 W. The zh (= 105 m) when v = 5 m/s is about 13 times longer than that (= 8 m) when v = 0 m/s. Thus, under conditions of v = 5 m/s and 30% relative humidity, laser beams with P = 100 W and ω = 20 mm can propagate over 100 m without damaging the initial beam shape at λ0 = 1.57μm.
| Published in | Journal of Electrical and Electronic Engineering (Volume 11, Issue 1) |
| DOI | 10.11648/j.jeee.20231101.12 |
| Page(s) | 15-22 |
| Creative Commons |
This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited. |
| Copyright |
Copyright © The Author(s), 2024. Published by Science Publishing Group |
Laser Beam Propagation, Moist Atmosphere, Aerosol, Optical Wireless Power Transmission, Eye-Safe Wavelength
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APA Style
Yoshito Shuto. (2023). Effect of Water and Aerosols Absorption on Laser Beam Propagation in Moist Atmosphere at Eye-Safe Wavelength of 1.57 μm. Journal of Electrical and Electronic Engineering, 11(1), 15-22. https://doi.org/10.11648/j.jeee.20231101.12
ACS Style
Yoshito Shuto. Effect of Water and Aerosols Absorption on Laser Beam Propagation in Moist Atmosphere at Eye-Safe Wavelength of 1.57 μm. J. Electr. Electron. Eng. 2023, 11(1), 15-22. doi: 10.11648/j.jeee.20231101.12
AMA Style
Yoshito Shuto. Effect of Water and Aerosols Absorption on Laser Beam Propagation in Moist Atmosphere at Eye-Safe Wavelength of 1.57 μm. J Electr Electron Eng. 2023;11(1):15-22. doi: 10.11648/j.jeee.20231101.12
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Download@article{10.11648/j.jeee.20231101.12,
author = {Yoshito Shuto},
title = {Effect of Water and Aerosols Absorption on Laser Beam Propagation in Moist Atmosphere at Eye-Safe Wavelength of 1.57 μm},
journal = {Journal of Electrical and Electronic Engineering},
volume = {11},
number = {1},
pages = {15-22},
doi = {10.11648/j.jeee.20231101.12},
url = {https://doi.org/10.11648/j.jeee.20231101.12},
eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.jeee.20231101.12},
abstract = {To realize optical wireless power transmission, atmospheric propagation of eye-safe wavelength (1.57μm) laser beams was theoretically investigated. Laser beams are affected by the presence of water vapor and aerosols which absorb and scatter the laser energy. The scattering coefficients of water molecules and aerosols were estimated to be about 6.3 × 10-7 and 5.6 × 10-5 m-1, respectively, at wavelength (λ0) of 1.57μm. Furthermore, the absorption coefficients of moist air at 30% relative humidity and aerosols were estimated to be about 6.16 × 10-3 and 2.52 × 10-5 m-1, respectively, at λ0 = 1.57μm. Then simulation of laser beam propagation in the moist atmosphere at λ0 = 1.57μm was performed using these coefficients. Under the condition of no wind, the beam intensity decreases rapidly with increasing the length z and the rate of decrease slows down as the beam radius (ω) increases. When zh is defined as the z where the normalized intensity is halved, the zh (= 25 m) at ω = 20 mm when input power P = 10 W is about three times longer than that (= 8 m) when P = 100 W. This result indicates that the thermal distortion of laser beams due to accumulated heat around the z axis becomes more conspicuous as the optical power increases. The effect of this thermal beam distortion can be weakened when the laser beam is subject to crosswinds. Under the condition of gentle uniform wind with wind velocity v = 5 m/s, propagation of laser beams with ω = 20 mm was studied when P = 100 W. The zh (= 105 m) when v = 5 m/s is about 13 times longer than that (= 8 m) when v = 0 m/s. Thus, under conditions of v = 5 m/s and 30% relative humidity, laser beams with P = 100 W and ω = 20 mm can propagate over 100 m without damaging the initial beam shape at λ0 = 1.57μm.},
year = {2023}
}
TY - JOUR T1 - Effect of Water and Aerosols Absorption on Laser Beam Propagation in Moist Atmosphere at Eye-Safe Wavelength of 1.57 μm AU - Yoshito Shuto Y1 - 2023/02/06 PY - 2023 N1 - https://doi.org/10.11648/j.jeee.20231101.12 DO - 10.11648/j.jeee.20231101.12 T2 - Journal of Electrical and Electronic Engineering JF - Journal of Electrical and Electronic Engineering JO - Journal of Electrical and Electronic Engineering SP - 15 EP - 22 PB - Science Publishing Group SN - 2329-1605 UR - https://doi.org/10.11648/j.jeee.20231101.12 AB - To realize optical wireless power transmission, atmospheric propagation of eye-safe wavelength (1.57μm) laser beams was theoretically investigated. Laser beams are affected by the presence of water vapor and aerosols which absorb and scatter the laser energy. The scattering coefficients of water molecules and aerosols were estimated to be about 6.3 × 10-7 and 5.6 × 10-5 m-1, respectively, at wavelength (λ0) of 1.57μm. Furthermore, the absorption coefficients of moist air at 30% relative humidity and aerosols were estimated to be about 6.16 × 10-3 and 2.52 × 10-5 m-1, respectively, at λ0 = 1.57μm. Then simulation of laser beam propagation in the moist atmosphere at λ0 = 1.57μm was performed using these coefficients. Under the condition of no wind, the beam intensity decreases rapidly with increasing the length z and the rate of decrease slows down as the beam radius (ω) increases. When zh is defined as the z where the normalized intensity is halved, the zh (= 25 m) at ω = 20 mm when input power P = 10 W is about three times longer than that (= 8 m) when P = 100 W. This result indicates that the thermal distortion of laser beams due to accumulated heat around the z axis becomes more conspicuous as the optical power increases. The effect of this thermal beam distortion can be weakened when the laser beam is subject to crosswinds. Under the condition of gentle uniform wind with wind velocity v = 5 m/s, propagation of laser beams with ω = 20 mm was studied when P = 100 W. The zh (= 105 m) when v = 5 m/s is about 13 times longer than that (= 8 m) when v = 0 m/s. Thus, under conditions of v = 5 m/s and 30% relative humidity, laser beams with P = 100 W and ω = 20 mm can propagate over 100 m without damaging the initial beam shape at λ0 = 1.57μm. VL - 11 IS - 1 ER -
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