Compensation method for performance degradation of optically addressed spatial light modulator induced by CW laser

Tongyao Du; Dajie Huang; He Cheng; Wei Fan; Zhibo Xing; Xuechun Li; Jianqiang Zhu

doi:10.1017/hpl.2021.63

Journals >High Power Laser Science and Engineering >Volume 10 >Issue 1 >Page 010000e7 > Article

High Power Laser Science and Engineering
Vol. 10, Issue 1, 010000e7 (2022)

Compensation method for performance degradation of optically addressed spatial light modulator induced by CW laser

Tongyao Du^1、2, Dajie Huang², He Cheng², Wei Fan^2、3、*, Zhibo Xing^2、3, Xuechun Li^2、3, and Jianqiang Zhu^2、3

Author Affiliations

¹Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei230026, China

²National Laboratory on High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai201800, China

³Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing100049, China

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DOI: 10.1017/hpl.2021.63 Cite this Article Set citation alerts

Tongyao Du, Dajie Huang, He Cheng, Wei Fan, Zhibo Xing, Xuechun Li, Jianqiang Zhu. Compensation method for performance degradation of optically addressed spatial light modulator induced by CW laser[J]. High Power Laser Science and Engineering, 2022, 10(1): 010000e7 Copy Citation Text

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Abstract

In this paper, we propose an effective method to compensate for the performance degradation of optically addressed spatial light modulators (OASLMs). The thermal deposition problem usually leads to the on-off ratio reduction of amplitude OASLM, so it is difficult to achieve better results in high-power laser systems. Through the analysis of the laser-induced temperature rise model and the liquid crystal layer voltage model, it is found that reducing the driving voltage of the liquid crystal light valve and increasing the driving current of the optical writing module can compensate for the decrease of on–off ratio caused by temperature rise. This is the result of effectively utilizing the photoconductive effect of Bi₁₂SiO₂₀ (BSO) crystal. The experimental results verify the feasibility of the proposed method and increase the laser withstand power of amplitude-only OASLM by about a factor of 2.5.

Keywords

beam intensity shaping liquid crystal optically addressed spatial light modulator thermal effects

$$\begin{align}\frac{\partial I}{\partial Z}=\alpha I\left(1-R\right),\end{align}$$

((1))

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$$\begin{align}\rho C\frac{\partial T}{\partial t}-\frac{k}{r}\frac{\partial }{\partial r}\left(\frac{\partial T}{\partial r}\right)-k\frac{\partial^2T}{\partial {z}^2}=Q=\alpha I\left(1-R\right),\end{align}$$

((2))

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$$\begin{align}{n}_{\mathrm{e}}(T)=A- BT+\frac{2}{3}{\left(\Delta n\right)}_0{\left(1-\frac{T}{T_{\mathrm{C}}}\right)}^{\beta },\end{align}$$

((3))

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$$\begin{align}{n}_{\mathrm{o}}(T)=A- BT-\frac{1}{3}{\left(\Delta n\right)}_0{\left(1-\frac{T}{T_{\mathrm{C}}}\right)}^{\beta },\end{align}$$

((4))

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$$\begin{align}\Delta n(T)={\left(\Delta n\right)}_0{\left(1-\frac{T}{T_{\mathrm{C}}}\right)}^{\beta }.\end{align}$$

((5))

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$$\begin{align}I={I}_0\left(1-R\right){\sin}^2\kern-2pt\left(\kern-2pt\frac{\pi }{2}\sqrt{1\kern-1pt +\kern-1pt{\left(\kern-1pt\frac{2\Delta nd}{\lambda}\right)\kern-2pt}^2}\right)\kern-2pt\bigg/\kern-2pt\left(\kern-2pt1+{\left(\frac{2\Delta nd}{\lambda}\right)}^2\right),\end{align}$$

((6))

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$$\begin{align}I={I}_0\left(1-R\right){\sin}^2\left(\frac{\pi }{2}\sqrt{N}\right)/N,\end{align}$$

((7))

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$$\begin{align}N=1+{\left(\frac{2{\left(\Delta n\right)}_0{\left(1-T/{T}_{\mathrm{C}}\right)}^{\beta }d}{\lambda}\right)}^2.\end{align}$$

((8))

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$$\begin{align}\Delta n&\approx {\Delta n}_0-\left(\frac{U_{\mathrm{LC}}-{U}_{\mathrm{th}}}{U_{\mathrm{th}}}\right), \nonumber\\ {\Delta n}_0&=\left(\frac{2\pi m{\left(1-T/{T}_{\mathrm{C}}\right)}^{\frac{\beta }{2}}-{U}_{\mathrm{LC}}}{\pi m{\left(1-T/{T}_{\mathrm{C}}\right)}^{\frac{\beta }{2}}}\right){\Delta n}_0,\end{align}$$

((9))

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$$\begin{align}{U}_{\mathrm{th}}=\pi m{\left(1-\frac{T}{T_{\mathrm{C}}}\right)}^{\beta /2}.\end{align}$$

((10))

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$$\begin{align}{U}_{\mathrm{LC}}={U}_{\mathrm{AC}}\frac{\frac{1}{R_0}+\frac{1}{R_{\phi }}+ j\omega {C}_{\mathrm{BSO}}+\frac{j\omega {C}_1}{1+ j\omega {R}_1{C}_1}}{\frac{1}{R_0}+\frac{1}{R_{\phi }}+ j\omega {C}_{\mathrm{BSO}}+\frac{j\omega {C}_1}{1+ j\omega {R}_1{C}_1}+\frac{1}{R_{\mathrm{LC}}}+ j\omega {C}_{\mathrm{LC}}},\end{align}$$

((11))

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$$\begin{align}& {N}_{U_{\mathrm{LC}}}=1 \nonumber \\ &\quad +{\left(\frac{2d{\Delta n}_0}{\pi m\lambda}\left(2\pi m{\left(1-\frac{T}{T_{\mathrm{C}}}\right)}^{\beta } -{U}_{\mathrm{LC}}{\left(1-\frac{T}{T_{\mathrm{C}}}\right)}^{\beta /2}\right)\right)}^2.\end{align}$$

((12))

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$$\begin{align}{T}_{\mathrm{SLM}}=\frac{I}{I_0}=\left(1-R\right){\sin}^2\left(\frac{\pi }{2}\sqrt{N_{U_{\mathrm{LC}}}}\right)/{N}_{U_{\mathrm{LC}}},\end{align}$$

((13))