Chinese Journal of Lasers, Volume. 47, Issue 1, 0100002(2020)
Research Progress on Near-Infrared High-Power Laser Damage of Liquid Crystal Optical Devices
Figures & Tables(13)
![Diagrams of liquid crystal molecule rotation[21].(a) No voltage is applied; (b) voltage is applied](/Images/icon/loading.gif){kind=icon}
Fig. 2. Diagrams of liquid crystal molecule rotation[21].(a) No voltage is applied; (b) voltage is applied
Fig. 3. Laser induced damage thresholds of ITO films with different thicknesses[29]. (a) 300 nm; (b) 100 nm; (c) 50 nm
Fig. 4. Microstructures and spectra of ITO films with different thicknesses[29]. (a) Microstructures; (b) spectra
Fig. 5. Degeneration of surface state of 90-nm ITO film observed by optical microscope with laser irradiation energy and damage size[32]
Fig. 6. Damage of ITO film in
Fig. 7. Laser induced damage thresholds of ITO films (with thickness in the range from 10 nm to 100 nm) irradiated by pulses with different pulse durations (threshold temperature represented by the solid line is 1800 K, and threshold temperature represented by the dotted line is 1000 K)[34]
Fig. 8. Typical damage morphologies of PI film under different laser irradiation. (a)-(c) Ultraviolet ps laser with wavelength of 355 nm; (d)-(f) near-infrared ps laser with wavelength of 1064 nm[44]
Fig. 9. Typical damage morphologies of PI film irradiated by the quasi-continuous nanosecond laser with the repetition rate of 20 kHz[45]. (a) Result observed by the white light interferometer (the parameter of the irradiated laser: 20.7 J/cm2, 50 pluses); (b) result observed by the microscopy (the parameter of the irradiated laser: 23 J/cm2, 500 pluses); (c) result observed by the SEM (the parameter of the irradiated laser: 19 J/cm
Fig. 10. Judgment of laser damage of liquid crystal material using image subtraction[57]. (a) Image before laser irradiation; (b) image after laser irradiation; (c) result that the image before laser irradiation is subtracted from the image after laser irradiation
Fig. 11. Migration of the liquid crystal material under different control modes[28]. (a) Under irradiation of high power continuous laser; (b) under heating of temperature controller
Table 1. Carrier density and carrier mobility of ITO films with different thicknesses[29]
View tableTable 1. Carrier density and carrier mobility of ITO films with different thicknesses[29]
Thickness /nm Carrier density /cm-3 Carrier mobility /(cm2·V-1·s-1) 300 5.0×1020 23.21 100 3.2×1020 22.98 50 1.2×1020 22.00
Table 2. Laser induced damage thresholds of liquid crystal optical devices and its components[25]
View tableTable 2. Laser induced damage thresholds of liquid crystal optical devices and its components[25]
Liquid crystal modulator element Laser damage resistance when wavelength is 1064 nm and impulse duration is 15 ns /(J·cm-2) Glass substrate (K8) >16.0 Liquid crystal layer >16.0 Alignment layer (GeO) 6.9 ITO transparent electrode 2.5-2.9 Liquid crystal modulator with longitudinal electric field 2.5-2.9
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Xiaofeng Liu, Liping Peng, Yuanan Zhao, Xi Wang, Dawei Li, Jianda Shao. Research Progress on Near-Infrared High-Power Laser Damage of Liquid Crystal Optical Devices[J]. Chinese Journal of Lasers, 2020, 47(1): 0100002
Paper Information
Category: reviews
Received: Jun. 18, 2019
Accepted: Oct. 9, 2019
Published Online: Jan. 9, 2020
The Author Email: Yuanan Zhao (yazhao@siom.ac.cn), Jianda Shao (jdshao@mail.shcnc.ac.cn)
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