The Spatial Light Modulators (SLMs) from Meadowlark Optics provide precision retardance control for spatially varying phase or amplitude. Our SLMs consist of liquid crystal pixels, each independently addressed, acting as separate variable retarders. Meadowlark SLMs are easily incorporated into optical systems requiring programmable masks and variable input-output devices. Applications include femtosecond pulse shaping, adaptive optics, optical data storage, correlation and spectroscopy.