In this work, we investigate the linear and nonlinear optical properties of polyvinyl alcohol (PVA) films doped by the natural dye extract from Caladium redflash (C. redflash) leaves. Linear optical properties of the doped films are tuned by varying the dopant concentration. Nonlinear absorption of the films is measured using 5 ns laser pulses at the wavelength of 532 nm, employing the open aperture Z-scan technique. The films show excellent optical limiting efficiency which arises from strong reverse saturable absorption at this wavelength, making them potential candidates for device applications in eye and sensor protection. These green, durable and cost-effective films can also be used as economical substitutes for costly transparent optical coatings made using synthetic dyes.

在这项工作中，我们研究了由钯红闪光（C. redflash）叶片的天然染料提取物掺杂的聚乙烯醇（PVA）膜的线性和非线性光学性质。通过改变掺杂剂的浓度来调节掺杂膜的线性光学性质。使用开孔Z扫描技术，使用5 ns激光脉冲在532 nm波长下测量薄膜的非线性吸收。薄膜显示出极好的光学限制效率，这是由于在该波长下强烈的反向饱和吸收引起的，因此它们有望成为眼部和传感器保护设备的候选材料。这些绿色，耐用且具有成本效益的薄膜也可以用作使用合成染料制成的昂贵的透明光学涂层的经济替代品。