The phase modulation capability of the liquid crystal spatial light modulator for light waves depends on the twist angle of the liquid crystal molecules. Under the premise of satisfying a certain polarization state and incident angle, the change of the interference fringes can be used to obtain an intuitive performance of the phase modulation capability.

UPOLabs liquid crystal optoelectronic characteristic measurement experimental system uses the change of interference fringes to quantitatively analyze the change relationship between the phase modulation and gray level of liquid crystal spatial light modulator, and intuitively reveal how the change of gray value affects the phase, so as to obtain the spatial light modulator Phase modulation curve.

The above picture is an interferometric phase measurement method, and there are other different forms of phase measurement methods that can be used in teaching experiments or innovative experimental courses to train the hands-on ability and analytical ability of students majoring in optics and physics.