What does a spatial light modulator do?
Spatial light modulator (SLM) is a general term describing devices that are used to modulate amplitude, phase, or polarization of light waves in space and time.
What does an SLM do?
A spatial light modulator (SLM) is a special device that can manipulate light by modulating the amplitude, phase or polarization of the light waves in the two dimensions of space and time.
What is a lighting modulator?
An optical modulator is a device which is used to modulate a beam of light. Often the easiest way to obtain modulation of intensity of a light beam, is to modulate the current driving the light source, e.g. a laser diode.
How do SLMs work?
Spatial light modulators (SLMs) are widely used as diffractive optical elements (DOEs) in optical systems to facilitate flexible control of light beams. In diffractive techniques, specific pattern is written onto the SLM by a computer and the input spatial light is modulated by the relevant pattern.
How is light modulated?
Integrated Optical Modulators: Modulation of Light Using Electro-Optical Crystals. With the Jenoptik integrated optical amplitude modulator, you can influence the amplitude of laser light at particularly high frequencies up to the gigahertz range with a very good extinction ratio.
How do you modulate light?
Modulating the output power of a laser diode can happen in two ways: by changing the signal input/driving current1,2 or by alternating the continuous wave output after the light is generated. In laser modulation, the current or voltage varies with time to modulate the output signal from the laser.
What is a laser modulator?
An acousto-optic modulator (AOM, also sometimes called a Bragg cell), is a device which can pulse the laser or alter the transmitted power at a very high frequency. Basically, they function by sending the laser beam through a crystal which is subjected to acoustic vibrations.
What does modulate mean?
1 : to tune to a key or pitch. 2 : to adjust to or keep in proper measure or proportion : temper. 3 : to vary the amplitude, frequency, or phase of (a carrier wave or a light wave) for the transmission of information (as by radio) also : to vary the velocity of electrons in an electron beam.
Which is used as modulator?
Acousto-optic modulators are based on the acousto-optic effect. They are used for switching or continuously adjusting the amplitude of a laser beam, for shifting its optical frequency, or its spatial direction….
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How are spatial light modulators used in holographic computing?
Spatial light modulator. 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. They can also be used as part of a holographic display technology . SLMs have been used as a component in optical computing.
How are liquid crystals used as spatial modulators?
As liquid crystals are birefringent, applying a voltage to the cell changes the effective refractive index seen by the incident wave, and thus the phase retardation of the reflected wave. A spatial light modulator (SLM) is an object that imposes some form of spatially varying modulation on a beam of light.
Which is an example of an amplitude modulation hologram?
An amplitude modulation hologram is one where the amplitude of light diffracted by the hologram is proportional to the intensity of the recorded light. A straightforward example of this is photographic emulsion on a transparent substrate.
Which is phase scan for spatial light modulator?
Multiphoton intrapulse interference phase scan (MIIPS) is a technique based on the computer-controlled phase scan of a linear-array spatial light modulator.