Opt Lett. 2013 Nov 15;38(22):4663-6. doi: 10.1364/OL.38.004663.
Unusually large phase modulation in a commercial liquid crystal spatial light modulator (LCSLM) is reported. Such a situation is obtained by illuminating with visible light a device designed to operate in the infrared range. The phase modulation range reaches 6π radians in the red region of the visible spectrum and 10π radians in the blue region. Excellent diffraction efficiency in high harmonic orders is demonstrated despite a concomitant and non-negligible Fabry-Perot interference effect. This type of SLM opens the possibility to implement diffractive elements with reduced chromatic dispersion or chromatic control.
报道了一种商用液晶空间光调制器（LCSLM）中出现的异常大的相位调制。通过用可见光照射设计用于红外波段工作的器件，可以获得这种情况。在可见光谱的红色区域，相位调制范围达到 6π 弧度，在蓝色区域达到 10π 弧度。尽管存在不可忽略的法布里-珀罗干涉效应，但在高次谐波中仍表现出了极好的衍射效率。这种类型的 SLM 为实现具有较小色散或色控的衍射元件提供了可能性。
