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Acousto-optics is a branch of physics that studies the interactions between sound waves and light waves, especially the diffraction of laser light by ultrasound (or sound in general) through an ultrasonic grating. A diffraction image showing the acousto-optic effect.
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). They are used in lasers for Q-switching, telecommunications for signal modulation, and in spectroscopy for frequency control.
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 ). Depending on the parameter of a light beam which is manipulated, modulators may be categorized into amplitude modulators, phase modulators, polarization modulators, etc.
The following other wikis use this file: Usage on cs.wikipedia.org Optický modulátor; Usage on de.wikipedia.org Modulator (Optik) Usage on fr.wikipedia.org
Wideband magneto-optic modulation in a bismuth-substituted yttrium iron garnet waveguide [5] The current transient creates a time-varying magnetic field that has a component along the direction of optical propagation. This component (underneath the microstrip line) acts to tip the magnetization, M, along the propagation direction of the optical ...
An optical waveguide is a physical ... of geometrical or ray optics, as illustrated in the diagram. ... arrayed waveguide gratings and acousto-optic ...
This frequency shift is usually generated by a Bragg cell, or acousto-optic modulator. [1] A schematic of a typical laser vibrometer is shown above. The beam from the laser, which has a frequency f o, is divided into a reference beam and a test beam with a beamsplitter. The test beam then passes through the Bragg cell, which adds a frequency ...
An acousto-optical spectrometer (AOS) is based on the diffraction of light by ultrasonic waves. [1] A piezoelectric transducer, driven by the RF signal (from the receiver), generates an acoustic wave in a crystal (the so-called Bragg-cell). This acoustic wave modulates the refractive index and induces a phase grating.