MoS2纳微薄膜激光非线性透射的调控研究∗

摘要

Ultrashort femtosecond pulse laser (pulse duration<40 fs) has a unique mechanism of thermal effects, but there is no optical limiting protection film designed for it. In our article, MoS2 nano-micron films (thickness 150—200 nm) are prepared by spin-coating method. Optical limiting test results show that for the ultrashort pulse laser, this film shows increasing transparency at low light intensity, while it shows decreasing transparency at a higher light intensity (optical limiting). It is capable of changing the optical limiting threshold by changing the incident wavelength which can be used for transparency enhancement and protection against damage of concentrator solar cells. Using this method to have a commercial GaAs solar cells coated found the conversion efficiency reduction < 3%, but the damage threshold increase>50%.%超短飞秒脉冲激光(脉冲时间<40 fs)有独特的热效应机理，但尚无针对其设计的光限幅保护膜。本文采用易于产业化的离散-旋涂法制备了MoS2纳微薄膜(厚度150—200 nm)。光限幅测试结果表明，针对超短脉冲激光，此纳微薄膜在低光强下增透，高光强下减透(光限幅)；且能通过改变入射波长，调控其光限幅阈值，可用于聚光太阳能电池的效率增强和损伤保护。利用此方法，对已商用的砷化镓太阳能电池进行涂膜，发现转换效率降低<3%，但损伤阈值提高>50%。