Liquid crystal display (LCD) is one of the optical devices that we see in our daily life. Its functionality is designed to operate in an amplitude modulation with up to a 32-bit resolution. As it is a low-cost spatial light modulator, this paper shows that two-dimensional (2-D) phase modulator can be obtained from this device. Experimental proof of concept using an off-the-shelf 60-USD 800x480-pixel LCD, a 633-nm wavelength laser diode, and a wavefront sensor shows that a linear 2-D phase modulator is obtained, offering a maximum 0.76-wave phase shift at a maximum grayscale value of 255. Varying digital bit control values from 0 to 255 leads to a very low optical power fluctuation of 1.53%.
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