Refraction effect of light-induced plasma during high-power diode laser processing
-
1.
School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430000, China
-
Corresponding author:
TANG Xiahui, txh1116@hust.edu.cn
;
-
Received Date:
2014-06-09
Accepted Date:
2014-08-19
-
Abstract
In order to solve the significant shielding effect of light-induced plasma on laser during high-power diode laser processing, with the help of the mathematical model of electron density of light-induced plasma and ABCD matrix algorithm, the shielding effect of light-induced plasma was studied from the view of absorption and refraction based on a diode laser processing system with wavelength of 976nm, spot size of 0.5mm1mm and the maximum power of 4kW. The results showed that laser beam shielding effect is mainly due to refraction effect of light-induced plasma under the condition of electron density ne1.01018/cm3. Laser beam shielding effect changes laser beam shape, i.e., making the laser focus down-shift, enlarging the spot and making the laser energy density smaller. The effect of induced-laser plasma is similar to a negative lens with non-linear gradient refractive index.
-
-
References
|
[1]
|
ZHANG R F, KONG L H, L Ch G. Design of constant-current source for high power semiconductor laser diode [J]. Laser Technology, 2012, 36(1): 80-83(in Chinese). |
|
[2]
|
XIE W J. Study on influence of groove on plasma plume induced during high power CO2 laser welding [D]. Shanghai: Shanghai Jiaotong University, 2013: 3-4(in Chinese). |
|
[3]
|
WANG L, SHENG X X, ZHANG W A, et al. Analysis of spectral propagating properties of Gaussian beam [J]. Laser Technology, 2012, 36(5): 700-703(in Chinese). |
|
[4]
|
ZHANG Sh G, ZHANG L, YU T Y, et al. Study about plasma intensity of laser rusting [J]. Laser Technology, 2013, 37(1): 56-58(in Chinese). |
|
[5]
|
WANG Ch. The effect of plasma thermal blockage on target under laser irradiation [D]. Beijing: Beijing Jiaotong University, 2013: 17-19(in Chinese). |
|
[6]
|
LIU L H, TAN H P. Gradient index optics [M]. Beijing: Science Press, 2013: 107-108(in Chinese). |
|
[7]
|
SHEN L T, CHEN J F, LI X Ch, et al. Finite element analysis on residual stress field for laser shock processing AM50 magnesium alloy [J]. Laser Technology, 2012, 36(1): 45-49(in Chinese). |
|
[8]
|
MA J, ZHAO Y, GUO R, et al. Numerical simulation of temperature rise of material surface irradiated by the laser [J].Laser Technology, 2013, 37(4): 455-459(in Chinese). |
|
[9]
|
TAO Zh P, TAO X Y. The analysis of the nonlinear process of laser in the linear increasing plasma [J]. Jiangxi Science, 2014, 32(2): 181-184(in Chinese). |
|
[10]
|
ZHANG Y M. Applied optics [M]. Beijing: Electronic Industry Press, 2013: 11-16(in Chinese). |
|
[11]
|
ZHOU B K. Laser principles [M]. Beijing: National Defence Industry Press, 2013: 75-77(in Chinese). |
-
-
Proportional views
-
Map
DownLoad: