Spatial light modulator

spatial light modulatorsSLMs
A spatial light modulator (SLM) is an object that imposes some form of spatially varying modulation on a beam of light.wikipedia
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Holographic data storage

Holographic memoryholographic storageholographically
SLMs are used extensively in holographic data storage setups to encode information into a laser beam in exactly the same way as a transparency does for an overhead projector.
Spatial light modulators (SLM) are pixelated input devices (liquid crystal panels), used to imprint the data to be stored on the object beam.

Transparency (projection)

transparenciestransparencyacetate
A simple example is an overhead projector transparency.
Many overhead projectors are used with a flat-panel LCD which, when used this way, is referred to as a spatial light modulator or SLM.

Liquid crystal on silicon

LCoSD-ILAliquid crystal on silicon (LCOS)
An example of an EASLM is the Digital Micromirror Device at the heart of DLP displays or LCoS Displays using ferroelectric liquid crystals (FLCoS) or nematic liquid crystals (Electrically Controlled Birefringence effect).
It is also referred to as a spatial light modulator.

Phased-array optics

phased arrayPhased array opticsholographic display technology
They can also be used as part of a holographic display technology.
Devices permitting detailed addressable phase control over two dimensions are a type of spatial light modulator (SLM).

Optical computing

optical computerphotonic computingPhotonic logic
SLMs have been used as a component in optical computing.
The input is encoded using a liquid crystal spatial light modulator and the result is measured using a conventional CMOS or CCD image sensor.

Optical tweezers

optical trapoptical trappingoptical tweezer
They also often find application in holographic optical tweezers.
When implemented with a spatial light modulator, such holographic optical traps also can move objects in three dimensions.

Forth Dimension Displays

FLCoS
An example of an EASLM is the Digital Micromirror Device at the heart of DLP displays or LCoS Displays using ferroelectric liquid crystals (FLCoS) or nematic liquid crystals (Electrically Controlled Birefringence effect).
ForthDD is a supplier of microdisplays for Near-To-Eye (NTE) applications and spatial light modulators for fringe projection systems.

Light valve

The image on an optically addressed spatial light modulator, also known as a light valve, is created and changed by shining light encoded with an image on its front or back surface.

Multiphoton intrapulse interference phase scan

MIIPS
Multiphoton intrapulse interference phase scan (MIIPS) is a technique based on the computer-controlled phase scan of a linear-array spatial light modulator.
A MIIPS-based device consists of two basic components controlled by a computer: a pulse shaper (usually a liquid crystal based spatial light modulator - SLM) and a spectrometer.

Modulation

modulatedmodulatordigital modulation
A spatial light modulator (SLM) is an object that imposes some form of spatially varying modulation on a beam of light.

Overhead projector

OHPoverheadoverhead projectors
A simple example is an overhead projector transparency.

Computer

computerscomputer systemdigital computer
Usually when the phrase SLM is used, it means that the transparency can be controlled by a computer.

Video projector

projectorsdigital projectorprojector
Since then more modern projectors have been developed where the SLM is built inside the projector.

Intensity (physics)

intensityintensitieslight intensity
Usually, an SLM modulates the intensity of the light beam.

Phase (waves)

phasephase shiftout of phase
However, it is also possible to produce devices that modulate the phase of the beam or both the intensity and the phase simultaneously.

Graphics display resolution

QVGAWVGAqHD
They are available at resolutions up to QXGA (2048 × 1536).

Digital micromirror device

DMD digital micromirror devices or DMDdigital micromirror technology
An example of an EASLM is the Digital Micromirror Device at the heart of DLP displays or LCoS Displays using ferroelectric liquid crystals (FLCoS) or nematic liquid crystals (Electrically Controlled Birefringence effect).

Digital Light Processing

DLPDLP projectordigital micro-mirrors
An example of an EASLM is the Digital Micromirror Device at the heart of DLP displays or LCoS Displays using ferroelectric liquid crystals (FLCoS) or nematic liquid crystals (Electrically Controlled Birefringence effect).

Ferroelectricity

ferroelectricferroelectricsFerroelectric effect
An example of an EASLM is the Digital Micromirror Device at the heart of DLP displays or LCoS Displays using ferroelectric liquid crystals (FLCoS) or nematic liquid crystals (Electrically Controlled Birefringence effect).

Liquid crystal

liquid crystalsnematicsmectic
An example of an EASLM is the Digital Micromirror Device at the heart of DLP displays or LCoS Displays using ferroelectric liquid crystals (FLCoS) or nematic liquid crystals (Electrically Controlled Birefringence effect).

Bandwidth-limited pulse

transform-limitedphase spectratransform limit
Through the phase scan to an ultrashort pulse, MIIPS can not only characterize but also manipulate the ultrashort pulse to get the needed pulse shape at target spot (such as transform-limited pulse for optimized peak power, and other specific pulse shapes).

Microscanner

Therefore, they have to be differentiated from spatial light modulators, other micro-mirror actuators which need a matrix of individually addressable mirrors for their mode of operation.

Structured-light 3D scanner

fringe projectionStructured Light 3D Scannerdepth sensor
Patterns are usually generated by passing light through a digital spatial light modulator, typically based on one of the three currently most widespread digital projection technologies, transmissive liquid crystal, reflective liquid crystal on silicon (LCOS) or digital light processing (DLP; moving micro mirror) modulators, which have various comparative advantages and disadvantages for this application.