摘要:
A method of producing a phase-only computer generated hologram for a pixellated Spatial Light Modulator device (200) supporting a discrete number of modulation levels and having an integrated layer of liquid crystal material above a silicon circuit, the method comprising: determining punctuated replay coordinates in a Fourier transform plane (202) of the SLM (200); using said coordinates for calculating the size in pixels of a base cell; evaluating a holographic base cell pattern using a phase quantisation procedure and replicating said base cell in the plane of the said hologram device 200) until the entire aperture of the hologram device is filled.
摘要:
A method of operating a pixellated liquid crystal spatial light modulator comprising: numerically determining a hologram cell pattern for a portion of the pixellated liquid crystal spatial light modulator (200), whereby the pattern provides a desired replay intensity distribution in a Fourier plane (202); writing the determined hologram pattern to one region of the portion of the pixellated liquid crystal spatial light modulator (200); illuminating (201) the portion of the pixellated liquid crystal spatial light modulator (200) whereby the desired replay intensity distribution is attained; numerically translating or scrolling the determined hologram pattern to form at least one shifted version of the pattern for said portion of the pixellated liquid crystal spatial light modulator (200); and writing the at least one shifted version of the hologram pattern to one shifted region of the portion of the spatial light modulator (200).