红外波段复合消色差1/4波片的优化设计

Optimization design of infrared composite achromatic λ/4 wave plate

在三元复合式消色差波片设计的基础上,对拓宽消色差范围的重要因素——单波片延迟量和复合角度进行了进一步分析和测试,提出了优化设计方案;利用石英晶体设计了适用于红外光通信波段的复合消色差波片。理论和实验均表明:通过调整单波片延迟量或改变复合角度可使该波片在中心波长为1 400nm的900nm～1 800nm波长范围内最大延迟偏差≤5%,而在光通信波段(1 200nm～1 600nm)该复合波片的最大延迟偏差只有3.2%。

According to the design of three-in-one composite achromatic wave plate,an infrared composite achromatic λ/4 wave plate made of quartz was designed,which could be used in optical communication wave band.We further analyzed and tested the wave plate phase delay and composite angle which were the important factors influencing the achromatism scope,and put forward an optimum design scheme.Theoretical analysis and experimental result show that by adjusting the wave plate phase delay or composite angle,the maximum delay deviation for 1/4 composite achromatic wave plate achieves ≤5% in the wavelength range of 900 nm～1 800 nm with the central wavelength of 1 400 nm,which meets the achromatic requirements;in the optical communication wave band of 1 200 nm～1 600 nm,the maximum delay deviation achieves only 3.2%.