Preparation and Performance Study of Liquid Protective Film

doi:10.16553/j.cnki.issn1000-985x.2024.0290

Abstract

Abstract: In order to optimize the protective performance and extend the service life of optical films， this paper innovatively uses liquid protective films to protect optical films. Pure substance protective films， mixed liquid protective films and colloidal protective films were prepared. Transmittance， laser damage threshold （LIDT） and self-healing properties of three types of liquid protective films were studied. The results show that the colloidal protective films have the best performance among the three liquid protective films. The transmittance of SiO₂ colloid reaches 91.8% and LIDT reached 34.2 J/cm². Based on the fluidity of liquids， all three types of liquid protective films have certain self-healing properties， which can repeatedly resist high-energy laser irradiation. Under the laser irradiation， the damage area of SiO₂ colloidal protective film is small and the self-healing time is shortest. After laser damage threshold testing， it is found that the optical film assembled with liquid protective film has better protective effect.

Key words: liquid protective film; transmittance; laser damage threshold; SiO₂ colloid; self-healing; laser irradiation

CLC Number:

TB383.2

LI Yan, HAN Sun, XU Cheng. Preparation and Performance Study of Liquid Protective Film[J]. Journal of Synthetic Crystals, 2025, 54(6): 1078-1088.

Figures/Tables 17

Fig.1 Liquid protective film. （a） Schematic diagram of liquid protective film；（b） physical picture of liquid protective film

Fig.2 Transmission curves of pure substance protective films

Fig.3 Laser damage threshold of pure material protective films

Fig.4 Transmission curves of mixed liquid protective films

Fig.5 Laser damage threshold of mixed liquid protective films

Fig.6 Transmission curves of colloid protective films

Fig.7 Laser damage threshold of colloid protective films

Fig.8 Evolution of laser damage point of pure C2H5OH protective film

Fig.9 Evolution of laser damage point of pure H2O protective film

Fig.10 Evolution of laser damage point of mixed liquid protective film of H2O and C2H5OH with 1∶1 ratio

Fig.11 Evolution of laser damage point of SiO2 colloid protective film

Fig.12 Damage area evolution of liquid protective film. （a） C2H5OH；（b） H2O；（c） mixed liquid of H2O and C2H5OH with 1∶1 ratio；（d） SiO2 colloid

Fig.13 Typical laser damage morphologies of four liquid protective films. （a） C2H5OH；（b） H2O；（c） mixed liquid of H2O and C2H5OH with 1∶1 ratio；（d） SiO2 colloid （Ⅰ and Ⅱ are enlarged images of the corresponding local areas， respectively）

Fig.14 Representative laser damage spot depth of four types of liquid protective films. （a） C2H5OH；（b） H2O；（c） mixed liquid of H2O and C2H5OH with 1∶1 ratio；（d） SiO2 colloid

Fig.15 The self-healing mechanism of liquid protective film （t1<t2<t3<t4）

Fig.16 Test structure （a） and LIDT （b） of liquid protective films

Fig.17 SEM image of HfO2 film surface （a） and surface appearance defect of K9 （b）

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