CS213626B1 - Multichannel electroaccoustic modulator and/or deflector - Google Patents

Description

The invention relates to a multi-channel acoustic-optical modulator and / or deflector based on an acethiocoptical unit which utilizes light diffraction on an acoustic wave in a single crystal.

Two basic types of acoustic-optical units are known for multiple modulation and / or deflection of light waves. In the first-type acoustic-ophthalmic unit, the piezoelectric transducer is powered - except for the phase shift - by the same excitation high-frequency electrical signal. The disadvantage of this arrangement is the need to combine the partial electrical signals for modulating and / or deflecting light in individual frequency-differentiated channels electronically, which places great demands on the bandwidth and in particular the linearity of the power electronic circuits. The second type of acoustooptical multi-channel modulator and / or deflector utilizes light diffraction on a small transverse wave in a TaO ₂ crystal of tellurium oxide. The existence of a slow transverse wave makes it possible to place several piezoelectric transducers, each flowing in the so-called Bragg diffraction mode, one after the other in the direction of the light wave propagation on one Te0 ₂ crystal cut. In this case, the individual inverters are powered from the eamoetmatic excitation signal sources. The advantage of this arrangement is the electrical isolation of the power supply circuits for the individual inverter, reducing the overall frequency requirement

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213 828 s Saw width · * Drives · No polishing of the independent olecte fit to each inverter. The disadvantage of wisdom is the need to work and circle out or elliptical pelarization of light. Yet another drawback is · and the relatively large size required for the cut of the crystal ® · ^Ο 2 4 4 ž ž · Je Je velmi velmi velmi velmi velmi Je Je Je Je Je

These drawbacks are eliminated by the acetoococepticocyte nonthater and / or by the deflterter of the invention, whose pedetate is also direct acoustic acoustic waves of brightness attached to the skin fever from the plane 1110) of the colossal crystalloid surface at an angle. 0.1 · to 20 ·.

The advantage of the oculo-optic modulator of the deflector of the present invention is that the distance of the individual piezoelectric transducers can be approximately three to five times not being taught compared to a similar element of non-crystals of TeOg while braggeve's diffraction mode is observed. It allows to substantially increase the total cost of the reeders as well as the cost of a crystal cut, or to place more converters on a cut of the same length. For example, to achieve the Braggeva div frakóe mode, the wavelength of 632.8 axes at 50 MHz in the TeOg crystal must be about 1 mm, the length of the piezoelectric transducer in the acoustic visa clearing direction must be approximately 1 mm. 3 axes, in the case of brenid and mercury jedid even mere 0.2 mm. Another advantage of the acousto-optic Modulator and / or Deflector according to the invention is that it operates in a linearly polarized light, wherein the polarizing light produced by the diffraction on the acoustic wave is perpendicular to the polarization of the light transmission. Advantageously, the abneral diffraction is laterally utilized by the ocuococcal wave to which it occurs when the angle of rotation ' in FIG. In this arrangement, the efficiency of diffraction in the resurrection frequency frequency does not depend on the ocio-ocular wave frequency. For example, the flow rate for a 24-channel modulator and / or deflector of a calonel crystal having a frequency separation of 1 MHz single-to-one transducers in the 60-84 MHz band at a crystal rotation angle Λ Λ 2 * does not exceed the aspen crystal cut length required. The length of the individual 24 inverters is 0.5 mm.

An example of a monoconoculoococio-ophthalmic modulator and / or deflector according to the invention is shown in a perspective view of the accompanying drawing.

The acousto-aceptic aneho-chamber modulator and / or deflector according to the invention consists of a non-crystalline rtuinate chloride winch to which the skin 2 rotated relative to the crystallographic plane (110) about the crystallographic direction λ 1 at an angle α of ravaf 18 * is connected four piezoelectric transducers 2 » The light wave chází enters the input sheet 2 o of the cut 1 of the aciothiocoptical crystal. From the crystal, it exits several modular left and / or deflected light waves 6 through the exit surface 2 'of the hollow wave. The side plates 2 o 2 »curling on the metal plate 2 are polished to allow light waves o to be transmitted pro output light waves dopad to incident light waves o deflected and / or modulated light waves ·.

The multichannel acuo-acceptor modulator and / or deflector according to the invention is suitable for use in multichannel optical data acquisition systems, as a gomorator of shots in laser tiekamai and other information processing on the acuotiokeeptiocin prinoip.

Claims (1)

A non-aceto-acetyeptic e / or sky deflector modulator consisting of a mercury halide crystal cut and attached in at least two independent acoustic wave sources in the direction and direction of the light wave propagation, characterized in that the acoustic wave source sources (3) are connected to the skin planes (110) around the cryetalegraphic direction of the angle [α] 0.1 · already 20 ·;