What is the purpose of acousto-optic modulator?
An acousto-optic modulator (AOM), also called a Bragg cell or an acousto-optic deflector (AOD), uses the acousto-optic effect to diffract and shift the frequency of light using sound waves (usually at radio-frequency).
What is fiber optic modulator?
An optical modulator is a device which is used to modulate a beam of light. The beam may be carried over free space, or propagated through an optical waveguide (optical fibre). This sort of modulation is called direct modulation, as opposed to the external modulation performed by a light modulator.
How does an AOM work?
Acousto-Optic Modulator (AOM) uses a sound wave to modulate an incoming beam of light to optimize optical systems and devices. Researchers are able to control the properties of the exit beam by manipulating the intensity, frequency, phase, polarization, and deflection of the input sound wave.
What is acousto-optic effect?
The acousto-optics is a field of physics that studies the interaction between sound and light. This interaction effect based on the diffraction of light by periodic modulation of the refractive index of a transparent optical material, which is generated by acoustic wave propagation in that environment.
What is acousto-optic tunable filter?
Acousto-optic tunable filters (AOTFs) are solid state wavelength tunable optical filters. Interactions of photons with these perturbations allow the AOTF to selectively diffract a single narrow-bandpass wavelength. The wavelength may be varied by changing the applied frequency.
What are the limitations of acoustic modulators?
The acousto-optic medium must be designed carefully to provide maximum light intensity in a single diffracted beam. The time taken for the acoustic wave to travel across the diameter of the light beam gives a limitation on the switching speed, and hence limits the modulation bandwidth.
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 is the meaning of modulator and demodulator?
A modulator is a device or circuit that performs modulation. A demodulator (sometimes detector) is a circuit that performs demodulation, the inverse of modulation. A modem (from modulator–demodulator), used in bidirectional communication, can perform both operations.
What is AOM in laser?
An acousto-optic modulator (AOM) is a device which can be used for controlling the power of a laser beam with an electrical drive signal.
What are acousto-optic devices?
Practical acousto-optic devices include modulators, beam deflectors, frequency shifters, couplers, switches, and spectrum analyzers. Elastic waves. An acoustic wave in a medium is an elastic wave of space- and time-dependent periodic deformation in the medium.
Is a confocal microscope a light microscope?
Light travels through the sample under a conventional microscope as far into the specimen as it can penetrate, while a confocal microscope only focuses a smaller beam of light at one narrow depth level at a time. The CLSM achieves a controlled and highly limited depth of field….
Why Raman-Nath modulators are not preferred for limited modulation bandwidth?
A modulator of Raman-Nath type is thus limited to applications with low acoustic frequencies and, consequently, small bandwidths. Such limitations do not apply to a modulator of Bragg type. Traveling acoustic waves are used in the majority of acousto-optic modulators.