The acousto-optic deflector is a practical gadget developed by using acousto-optic effects. It has actually been widely made use of in beam control, optical signal handling, optical computer, optical interaction as well as various other fields.
An acousto-optic deflector is a functional tool designed by using acousto-optic results. It has actually been widely made used in light beam control, optical signal handling, optical computing, optical interaction, and also various other areas.
Acousto-optical result
When the ultrasonic wave propagates in the acousto-optic crystal, it will certainly lead to the routine modification of the crystal's refractive index, comparable to the generation of a phase quantity grating, and the case light will diffract. Altering the power and frequency of the ultrasonic field can properly regulate the diffracted light's instructions, strength, and regularity.
L.Brillouin initially predicted the acousto-optic effect in 1922. American researchers P. Dalbye and also W.ears confirmed the existence of acousto-optic diffraction through experiments. Consequently, because of the look of laser, from 1966 to 1976, the concept of acousto-optical communication and also the study of acousto-optical tools have actually been swiftly established, amongst which Dixon's Dixon formula, W.r.kalin as well as B.D.Conook's acousto-optical paired wave equation and also I.C.Hang's concept of momentum matching and a mismatch have continuously improved individuals' cognition of acousto-optical effects.
C. Riam, as well as N. Nath, described the connection between the multi-order diffraction light and the first-order diffraction light in acousto-optic diffraction making use of the coupled wave formula. They split the modes of acousto-optic activity right into Bragg diffraction and also Raman-Nath diffraction. The acousto-optic interaction has a particular length of L0, and the interaction area of the Raman Neiss acousto-optic effect is relatively brief, L ≤ L0. The acousto-optic crystal amounts to an airplane grating, as well as the instructions for event light are not strict as well as can produce multi-level diffraction light. The communication area of the Bragg acousto-optical impact is reasonably long, L ≥ 2L0, and the whole crystal is equivalent to an individual grating, which has rigorous requirements on the direction of case light. Only the case light conference Bragg's problem can create diffraction light, and also the sophisticated diffraction light is practically negated, leaving just the 0 as well as ± 1 order diffraction light.
Acousto-Optic Crystals
Acousto-optic crystals with large flexible coefficients, good tool uniformity, tiny sound rate, tiny ultrasonic depletion, wide light transmission array as well a large size are required to produce acousto-optic gadgets. Currently, lead molybdate (PbMoO4), TeO2, lithium niobate (LiNbO3), Quartz as well as Fused Silica are mostly utilized in the audio-optical crystals. These materials have the features of high diffraction efficiency and also huge functioning transmission capacity, etc. Maximizing the functional setting can accomplish the ideal layout of the tool function.
The working concept of acousto-optic deflector
The acousto-optic deflector generally contains an acousto-optic tool as well as an electroacoustic transducer. Acousto-optic tool is the medium of acousto-optic communication. The electroacoustic transducer is likewise referred to as an ultrasonic generator. The role is to transform electrical power right into excellent power to generate an ultrasonic area in the tool. As a sound wave is a flexible wave, the propagation of the acoustic wave in the medium will certainly produce flexible stress, called the elastic-light impact. Flexible deformation will certainly cause a change in the refractive index of the tool. This adjustment in the refractive index carries acoustic details. The impact is equivalent to producing a refractive index grating on the medium with a spacing equal to the wavelength of the acoustic wave. When the ultrasonic regularity adjusts with the obtained signal of different frequencies, the grating period likewise transforms. Bragg diffraction takes place when the beam passes through the refractive index grating under particular problems. The adjustment of the input voltage signal of the electroacoustic transducer can change the acoustic wave regularity and manage the acoustic wave deflection at different angles. In Bragg diffraction, theoretically, all the power of the incident beam of light can be converted to the diffraction beam of light, and the diffraction performance degree is high.
With the development of optoelectronic technology, acousto-optic devices have been commonly made use of in lots of areas due to their exceptional performance.
