How does an AOM work?
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).
How does acousto-optic modulator work?
How Does an Acousto-Optic Modulator Work? Acousto-optic modulator typically uses a transparent crystal or piece of glass as a medium for light propagation. An electric signal then drives an attached transducer to vibrate, therefore generating a sound wave within the cell.
How does an acousto-optic deflector work?
Acousto-Optic Beam Deflectors (AOBD) are used to control the position of a laser beam as well as modulation. By careful broadband design of the transducer and by varying the frequency of the drive signal, the angle that the laser beam is deflected will change.
What is an RF driver?
An RF driver generates an RF signal that is used to generate the acoustic wave within the crystal of an AO device. The frequency and intensity of the applied RF signal will determine how much an optical beam is modulated, deflected, or tuned.
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. Modern AOTFs are constructed by attaching piezoelectric transducers to an appropriate crystalline material. By driving the transducers at the appropriate frequency, a series of perturbations traverse the material.
Why do we need an optical modulator?
Unsourced material may be challenged and removed. 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.
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.