What is a Bragg cell?
Bragg cell. acousto-optic modulator A device that varies the amplitude and phase of a light beam; e.g., from a laser or by sound waves. Also known as a Bragg cell.
What is the principle 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).
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. The diffraction angle is exaggerated; it is normally only of the order of 1°.
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 Raman-Nath effect?
The acoustooptic effect is the change in the refractive index of a medium caused by the mechanical strain produced by an acoustic wave. The former is referred to as Raman–Nath diffraction and is usually observed at low acoustic frequencies.
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. A RF driver typically consists of an RF oscillator, a modulation circuit, and a power amplifier which generates an RF signal to drive an AO device.
What is Raman Nath effect?
What is optics and acoustics?
Acoustic- 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. As with optics, acoustics has a history of similar duration.
What are acousto-optic devices?
Acousto-optics is a versatile technology that allows users to precisely and rapidly control the wavelength, amplitude and propagation direction of a laser beam.
Why do we need RF signal?
An RF signal is an electromagnetic wave that communications systems use to transport information through air from one point to another. RF signals have been in use for many years. They provide the means for carrying music to FM radios and video to televisions.
What is Bragg’s law?
Bragg’s law is a special case of Laue diffraction, which determines the angles of coherent and incoherent scattering from a crystal lattice. When X-rays are incident on a particular atom, they make an electronic cloud move like an electromagnetic wave.
What is a Bragg spectrophotometer?
The Braggs used crystals in the reflection geometry to analyze the intensity and wavelengths of X-rays (spectra) generated by different materials. Their apparatus for characterizing X-ray spectra was the Bragg spectrometer.
What is Bragg’s equation?
Bragg Equation. Bragg’s Law describes the following equation. nλ = 2d sinΘ. The equation explains why the faces of crystals reflect X ray beams at particular angles of incidence (Θ, λ). The variable d indicates the distance between atomic layers and the variable Lambda specifies the wavelength of incident X-ray beam.
What is Bragg’s diffraction?
Bragg’s diffraction was first proposed by William Henry Bragg and William Lawrence Bragg, in 1913. Bragg’s diffraction occurs when a subatomic particle or electromagnetic radiation, waves have wavelengths that are comparable to atomic spacing in a crystal lattice.