Parent Article

Referencing Articles (1)

Article Functions

Lab Questions/Comments

Lab Updates

Article Category

Search the Wiki


Digital Optics-Spatial Light Modulators in BFY Labs

This Immersion aims to share experiences incorporating digital display technologies into instructional labs beyond the first year of university. For example, in our traditional Junior-level Optical Physics course ( ), these technologies are only incorporated after a series of “prequel” activities, starting with qualitative observation of aberrations, using hand-held lenses, then "walking a laser" through "cloned apertures" on an optical breadboard, and "optical cloaking" as a means of teaching ABCD matrices. Students disassemble "broken" classroom projectors (which our university donates to the teaching labs as they are removed from active service), and use diffraction to find the "filling fraction" of the Spatial Light Modulators (SLMs) contained within these displays, and compare those to (much more useful) educational SLMs available from Jasper Display Corp., and to low-cost Digital Micromirror Devices (DMDs). The educational SLMs are not just for computer-generated Holograms (though that’s part of the attraction for students); they are useful for teaching Fourier Optics, as well as for dynamic Aberration Correction, teaching about Laser Modes, and encoding information, the linear momentum, spin angular momentum, and orbital angular momentum of light beams, complementing an introduction to single-photon quantum mechanics, including "Ghost Imaging," where the photons incident upon the detecting camera have never interacted with the object imaged (by exploiting correlations that are required by simple principles: conservation of energy and conservation of momentum.)

Estimated cost:  One of the systems in use during this Immersion is the Jasper Display SLM Education Kit ( )  which costs approximately $5000.  Other SLMs are available, and can even be obtained from old projectors.