Thermal Distortion of 960-Line Spectral Beam Combining Grating

Fig. 2. (a) Variation of maximum temperature of spectral beam combining grating surface with irradiation power density; (b) variations of Hmax and M2 with irradiation power density

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Fig. 3. (a)-(c) The middle processes of model building; (d) the simulated light path diagram after simplification

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Fig. 4. (a) Distortion of spectral beam combing grating surface at different irradiation power densities; (b)-(e) the intensity distributions of far-field beam spots at different irradiation power densities

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Fig. 5. (a) Variation of maximum temperature of spectral beam combing grating with the thickness of substrate; (b) thermal distortion of spectral beam combing grating with different substrate thicknesses

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Table 1. Thermodynamic parameters of silica substrate
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Table 1. Thermodynamic parameters of silica substrate
Parameter Value
Density /(kg·m^-3) 2200
Refractive index 1.44
Heat capacity /(J·kg^-1·K^-1) 670
Thermal conductivity /(W·m^-1·K^-1) 1.4
Thermal expansion /(10^-6 K^-1) 0.55
Young’s modulus /GPa 72
Poisson ratio 0.17

Table 2. Maximum temperature, maximum thermal distortion and far-field beam quality of spectral beam combining grating at different irradiation power densities
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Table 2. Maximum temperature, maximum thermal distortion and far-field beam quality of spectral beam combining grating at different irradiation power densities
Irradiation power density /(kW·cm^-2) 0.08 2.00 3.60 10.00
Maximum temperature /℃ 20 118 200 528
$\begin{matrix} {H_{\max}}_{} \end{matrix}$ /nm 4 76 136 372
$\begin{matrix} M_{x}^{2} \end{matrix}$ 1.04 1.29 1.58 3.17
$\begin{matrix} M_{y}^{2} \end{matrix}$ 1.00 1.01 1.04 1.83

Table 3. Far-field beam quality of spectral beam combing grating with different substrate thicknesses at laser irradiation with same power density
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Table 3. Far-field beam quality of spectral beam combing grating with different substrate thicknesses at laser irradiation with same power density
Thickness /mm 1 2 3 4 5
$\begin{matrix} M_{x}^{2} \end{matrix}$ 1.60 1.55 1.50 1.45 1.39
$\begin{matrix} M_{y}^{2} \end{matrix}$ 1.04 1.04 1.04 1.03 1.03

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Jiao Xu, Junming Chen, Peng Chen, Yonglu Wang, Yibin Zhang, Fanyu Kong, Yunxia Jin, Jianda Shao. Thermal Distortion of 960-Line Spectral Beam Combining Grating[J]. Acta Optica Sinica, 2018, 38(5): 0505002

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Paper Information

Category: Diffraction and Gratings

Received: Oct. 10, 2017

Accepted: --

Published Online: Jul. 10, 2018

The Author Email: Jin Yunxia (yxjin@siom.ac.cn)

DOI:10.3788/AOS201838.0505002

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Thermodynamic parameters of silica substrate

Table 1. Thermodynamic parameters of silica substrate

Table 2. Maximum temperature, maximum thermal distortion and far-field beam quality of spectral beam combining grating at different irradiation power densities

Table 2. Maximum temperature, maximum thermal distortion and far-field beam quality of spectral beam combining grating at different irradiation power densities

Table 3. Far-field beam quality of spectral beam combing grating with different substrate thicknesses at laser irradiation with same power density

Table 3. Far-field beam quality of spectral beam combing grating with different substrate thicknesses at laser irradiation with same power density