Factors Affecting Cold-Temperature Electro-Optic <i>Q</i>-Switching Performance of Lithium Niobate Crystals

Jifang Shang; Qinglian Li; Zeyang Lu; Xing Sun; Ling Chen; Wenjing Du; Liubang Li

doi:10.3788/CJL240752

Chinese Journal of Lasers, Volume. 51, Issue 19, 1901017(2024)

Factors Affecting Cold-Temperature Electro-Optic Q-Switching Performance of Lithium Niobate Crystals

Jifang Shang^1、*, Qinglian Li², Zeyang Lu¹, Xing Sun¹, Ling Chen¹, Wenjing Du¹, and Liubang Li³

¹Henan Key Laboratory of Electronic Ceramic Materials and Application, College of Materials Engineering, Henan University of Engineering, Zhengzhou 451191, Henan , China

²School of Physics, Nankai University, Tianjin 300071, China

³Zhengzhou Zhuoertai New Material Technology Co., Ltd., Zhengzhou 450016, Henan , China

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Figures & Tables(12)

Fig. 1. Schematic of LN electro-optic Q-switched Nd∶YAG laser device

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Fig. 2. Dynamic to static ratios of each LN Q switch at different temperatures

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Fig. 3. Experimental setup of conoscopic interference at high and low temperatures

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Fig. 4. Conoscopic interference patterns in different regions of light-transmission cross sections of LN crystals at cold temperatures. (a) LN₁; (b) LN₂; (c) LN₃

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Fig. 5. Finite element simulation result of electric field created by pyroelectric charges in LN crystals with direction of electric field shown by arrows

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Fig. 6. Transmission spectra of RLN and LN crystals

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Fig. 7. RLN crystal for electro-optic Q-switching

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Fig. 8. Ratio between dynamic to static ratio at each temperature and that at room temperature of RLN Q switch

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Fig. 9. Conoscopic interference patterns in different regions of light-transmission cross sections of RLN crystals at cold temperatures

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Table 1. Pyroelectric coefficient and conductivity of each LN crystal
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Table 1. Pyroelectric coefficient and conductivity of each LN crystal
Sample LN₁ LN₂ LN₃
Pyroelectric coefficient /（10^-9 C·cm^-2·K^-1） 8.15 7.66 7.95
Conductivity /
（10^-13 Ω^-1·m^-1）
6.1 14.6 34.3

Table 2. Output results of RLN and LN electro-optic Q-switched Nd∶YAG lasers
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Table 2. Output results of RLN and LN electro-optic Q-switched Nd∶YAG lasers
Sample E₁ /mJ E₂ /mJ E₃ /mJ E₄ /mJ U₁ /V U₂ /V
RLN 156 0 150 131 2050 3460
LN 191 0 186 162 2100 3540

Table 3. Output energy values of RLN electro-optic Q-switched laser at different temperatures
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Table 3. Output energy values of RLN electro-optic Q-switched laser at different temperatures
Temperature /℃ -40 -30 -20 -10 0 25
Output energy /mJ 30.4 34.0 36.4 35.2 34.0 34.6

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Jifang Shang, Qinglian Li, Zeyang Lu, Xing Sun, Ling Chen, Wenjing Du, Liubang Li. Factors Affecting Cold-Temperature Electro-Optic Q-Switching Performance of Lithium Niobate Crystals[J]. Chinese Journal of Lasers, 2024, 51(19): 1901017

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