What is the purpose of acousto-optic modulator?
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.
How does an electro-optic modulator work?
An electro-optic modulator (EOM) is an optical device in which a signal-controlled element exhibiting an electro-optic effect is used to modulate a beam of light. The modulation may be imposed on the phase, frequency, amplitude, or polarization of the beam.
What is lithium niobate modulator?
Lithium niobate modulator is an electro-optic device that uses a signal-controlled element which exhibits an electro-optic effect to modulate an optical beam. The basic knowledge behind these modulators is to modify the electric-optical properties of a material such as amplitude, phase, position, and frequency.
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 Raman Nath effect?
When a light beam is incident on such a refractive index grating, diffraction takes place and this produces either multiple order diffraction or only single order diffraction. The former is referred to as Raman–Nath diffraction and is usually observed at low acoustic frequencies.
How does an acousto-optic deflector work?
Acousto-optic deflectors are devices which can be used to deflect a laser beam in one direction by a variable angle, controlled by the frequency of an electrical signal. Figure 1: Schematic setup of a non-resonant acousto-optic modulator….
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Where are modulators used?
How modulation works. Information can be added to the carrier by varying its amplitude, frequency, phase, polarization — for optical signals — and even quantum-level phenomena like spin. Modulation is usually applied to electromagnetic signals: radio waves, lasers/optics and computer networks.
What are the types of electro-optic modulators?
Phase modulators are used to stabilize the frequency of a laser beam, or to mode-lock a laser. There are basically two types of modulators: bulk and integrated-optic. Bulk modulators are made out of discrete pieces of nonlinear optical crystals and are typically used on a lab bench or an optical table.
How does a phase modulator work?
Phase modulation works by modulating the phase of the signal, i.e. changing the rate at which the point moves around the circle. This changes the phase of the signal from what it would have been if no modulation was applied. In other words the speed of rotation around the circle is modulated about the mean value.
How does a Mach Zehnder modulator work?
A Mach-Zehnder modulator is used for controlling the amplitude of an optical wave. The input waveguide is split up into two waveguide interferometer arms. If a voltage is applied across one of the arms, a phase shift is induced for the wave passing through that arm.
What is Raman Nath theory?
At sound frequencies of a few megahertz and lower, Raman-Nath theory determines light diffraction by sound if the interaction length is no longer than about 35 cm. Imaging rules under Raman-Nath conditions are nearly the same as corresponding rules for imaging under Bragg conditions.
What is a Bragg cell?
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).