研究目的
To develop a type of λ/4–λ/4 ultra-broadband antire?ective coating for ampli?er blast shields of the Shen Guang II high power laser facility (SG-II facility) that exhibits a broadband antire?ective property in the 450–950 nm wavelength range, possesses high abrasion resistance, the ability to withstand ?ash lamp glow discharges, and high durability.
研究成果
A type of λ/4–λ/4 ultra-broadband antire?ective coating was successfully developed for ampli?er blast shields, demonstrating less than 1% average residual reflection in the 450–950 nm spectral range and effective coverage of the main absorption peak of Nd:glass even at 60? incidence angle. The coatings also showed improved chemical stability and scratch resistance after baking at 500 ?C.
研究不足
The study does not mention the scalability of the sol–gel dip coating method for industrial applications or the long-term durability of the coatings under continuous operation conditions.
1：Experimental Design and Method Selection:
The study employed a sol–gel dip coating method to prepare ultra-broadband antire?ective coatings. The method involved the use of modified low refractive silica and high refractive silica layers.
2：Sample Selection and Data Sources:
Fused silica glass (50 mm × 60 mm, d = 2 mm) was used as the substrate.
3：List of Experimental Equipment and Materials:
The materials included teraethoxysilane (TEOS), H2O, NH3, anhydrous ethanol (C2H5OH), hydrochloric acid (HCl), and fused silica glass. Equipment included a UV–Vis–NIR spectrophotometer (Lambda 1050, Perkin-Elmer) for optical transmittance measurements.
4：Experimental Procedures and Operational Workflow:
The process involved preparing low refractive silica (LRS) and acid catalyzed silica (ACS), mixing them to form LA90 sol, coating the fused silica glass with BA60 and then with LA90 sol, followed by baking at specific temperatures.
5：Data Analysis Methods:
The refractive indices and coating thickness were extracted from the transmission data, and simulation was carried out with the thin film design software TFCalc.
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