The use of high-power lasers in the industry has been rapidly advanced by incorporating flexible-fiber-based beam delivery. In order to deliver high-power laser beam to a distant place, the laser beam must propagate through the atmosphere. When the laser beam propagates through a medium, a fraction of the laser energy is absorbed by the medium. This absorbed power heats the medium and alters the index of refraction of the path, and leads to a distortion of the beam itself. This phenomenon is called thermal blooming. Thermal blooming at λ0 = 1.08 μm is caused by the absorption of water vapor. In this article, high-power laser beam propagation in a slightly wet atmosphere at λ0 = 1.08 μm was theoretically investigated. At First, the absorption coefficient (α) of air at 10% relative humidity was estimated. Then, simulation of thermal blooming of Gaussian laser beam with an initial power of 1 kW and a radius of 5 mm was conducted using this α. Under the condition of no wind, the beam intensity decreases rapidly with increasing length z. At z = 16 m, the intensity of laser beam became 1/5 of the initial intensity at z = 0 m. When laser beam propagated in the moist air with transverse air flow, thermal distortion of the beam was not symmetrical around the z axis because of the asymmetry introduced by the one-dimensional wind velocity v. Under the condition of calm uniform wind with v = 0.05 m/s, laser beams propagated only 25 to 30 m at most without damaging the initial beam shape. On the other hand, the beams propagated 65 to 70 m at most without beam-shape deformation under the condition of light uniform wind with v = 0.5 m/s.
| Published in | Journal of Electrical and Electronic Engineering (Volume 10, Issue 6) |
| DOI | 10.11648/j.jeee.20221006.11 |
| Page(s) | 215-222 |
| 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), 2022. Published by Science Publishing Group |
Laser Beam Propagation, Moist Atmosphere, Thermal Blooming
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APA Style
Yoshito Shuto. (2022). High-Power Laser Beam Propagation in Slightly Wet Atmosphere. Journal of Electrical and Electronic Engineering, 10(6), 215-222. https://doi.org/10.11648/j.jeee.20221006.11
ACS Style
Yoshito Shuto. High-Power Laser Beam Propagation in Slightly Wet Atmosphere. J. Electr. Electron. Eng. 2022, 10(6), 215-222. doi: 10.11648/j.jeee.20221006.11
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Download@article{10.11648/j.jeee.20221006.11,
author = {Yoshito Shuto},
title = {High-Power Laser Beam Propagation in Slightly Wet Atmosphere},
journal = {Journal of Electrical and Electronic Engineering},
volume = {10},
number = {6},
pages = {215-222},
doi = {10.11648/j.jeee.20221006.11},
url = {https://doi.org/10.11648/j.jeee.20221006.11},
eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.jeee.20221006.11},
abstract = {The use of high-power lasers in the industry has been rapidly advanced by incorporating flexible-fiber-based beam delivery. In order to deliver high-power laser beam to a distant place, the laser beam must propagate through the atmosphere. When the laser beam propagates through a medium, a fraction of the laser energy is absorbed by the medium. This absorbed power heats the medium and alters the index of refraction of the path, and leads to a distortion of the beam itself. This phenomenon is called thermal blooming. Thermal blooming at λ0 = 1.08 μm is caused by the absorption of water vapor. In this article, high-power laser beam propagation in a slightly wet atmosphere at λ0 = 1.08 μm was theoretically investigated. At First, the absorption coefficient (α) of air at 10% relative humidity was estimated. Then, simulation of thermal blooming of Gaussian laser beam with an initial power of 1 kW and a radius of 5 mm was conducted using this α. Under the condition of no wind, the beam intensity decreases rapidly with increasing length z. At z = 16 m, the intensity of laser beam became 1/5 of the initial intensity at z = 0 m. When laser beam propagated in the moist air with transverse air flow, thermal distortion of the beam was not symmetrical around the z axis because of the asymmetry introduced by the one-dimensional wind velocity v. Under the condition of calm uniform wind with v = 0.05 m/s, laser beams propagated only 25 to 30 m at most without damaging the initial beam shape. On the other hand, the beams propagated 65 to 70 m at most without beam-shape deformation under the condition of light uniform wind with v = 0.5 m/s.},
year = {2022}
}
TY - JOUR T1 - High-Power Laser Beam Propagation in Slightly Wet Atmosphere AU - Yoshito Shuto Y1 - 2022/11/14 PY - 2022 N1 - https://doi.org/10.11648/j.jeee.20221006.11 DO - 10.11648/j.jeee.20221006.11 T2 - Journal of Electrical and Electronic Engineering JF - Journal of Electrical and Electronic Engineering JO - Journal of Electrical and Electronic Engineering SP - 215 EP - 222 PB - Science Publishing Group SN - 2329-1605 UR - https://doi.org/10.11648/j.jeee.20221006.11 AB - The use of high-power lasers in the industry has been rapidly advanced by incorporating flexible-fiber-based beam delivery. In order to deliver high-power laser beam to a distant place, the laser beam must propagate through the atmosphere. When the laser beam propagates through a medium, a fraction of the laser energy is absorbed by the medium. This absorbed power heats the medium and alters the index of refraction of the path, and leads to a distortion of the beam itself. This phenomenon is called thermal blooming. Thermal blooming at λ0 = 1.08 μm is caused by the absorption of water vapor. In this article, high-power laser beam propagation in a slightly wet atmosphere at λ0 = 1.08 μm was theoretically investigated. At First, the absorption coefficient (α) of air at 10% relative humidity was estimated. Then, simulation of thermal blooming of Gaussian laser beam with an initial power of 1 kW and a radius of 5 mm was conducted using this α. Under the condition of no wind, the beam intensity decreases rapidly with increasing length z. At z = 16 m, the intensity of laser beam became 1/5 of the initial intensity at z = 0 m. When laser beam propagated in the moist air with transverse air flow, thermal distortion of the beam was not symmetrical around the z axis because of the asymmetry introduced by the one-dimensional wind velocity v. Under the condition of calm uniform wind with v = 0.05 m/s, laser beams propagated only 25 to 30 m at most without damaging the initial beam shape. On the other hand, the beams propagated 65 to 70 m at most without beam-shape deformation under the condition of light uniform wind with v = 0.5 m/s. VL - 10 IS - 6 ER -
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