专利摘要:
A acousto-optical cell (1) has at least one ultrasonic transducer (3) from which the outgoing laser beams (8, 11) are coming out in a common plane, the circuit arrangement comprises VHF or UHF osclllators (5, 10) coupled through respective control stages (6) to the ultrasonic transducers (3). The frequency of each oscillator defines the diffraction angle of an associated outgoing laser beam the intensity of which is dependent from the amplitude of the oscillator. The passage of the osciilator outputs towards the respective ultrasonic transducers (3) is controlled by the control stages (6) according to predetermined operational requirements. …<??>In order to enable the generation of outgoing laser beams (8, 11) with variable diflraction angles within the common plane of the outgoing beams at least one of the high frequency oscillators Is designed as an oscillator of variable frequency (10, 18) having a frequency determining input (13). By means of applying a control voltage to this frequency determining input (13) the diffraction angle of the corresponding outgoing laser beam can be adjusted during operation which has advantages in certain fields of application.
公开号:SU984418A3
申请号:SU802910501
申请日:1980-04-18
公开日:1982-12-23
发明作者:Подманицки Андраш;Текеш Саболч;Маркуш Ленк Аттила
申请人:Мадьяр Тудоманьош Академиа Самиташтехникаи Еш Аутоматизалаши Кутато Интезет (Инопредприятие);
IPC主号:
专利说明:

(5) SCHEME. LASER BEAM MANAGEMENT
权利要求:
Claims (3)
[1]
The invention relates to laser beam control systems, in particular, to acoustic-optical modulators, and can be used to obtain several output laser beams with constant and adjustable deflection angles. 1I, A device for producing several light beams based on polarization electrodes is known. optical switches; The disadvantages of the electro-optical interceptors of such a device are the need for high control voltages, the need to operate; in polarized light, low resolution The closest technical essence of the invention is the control circuit of a laser character generator based on the Bragg diffraction law, containing an acoustic optic black element / at least one ultrasonic transducer, high-frequency oscillators in the ultrasonic band frequency, connected through the appropriate master stages, at least one ultrasonic transducer, and the frequencies of all HF oscillators determine the output angles of optical their amplitudes affect the intensity of the output beams, and at the same time each driver has a control input, the state of which determines the amplitude of the signal of the corresponding oscillator
[2]
2  In a known laser symbol generator, the laser beam forming marks is derived from a single acoustic-optical modulator with a constant.  in time angle of exit.  In this acoustic-optical modulator, oscillators of very high frequency are used, and each oscillator is in cascade.   cad attached to the ultrasonic transducer acoustical.  an item.  The frequency of each oscillator determines the direction of the relative output of the laser output beam, and its amplitude there determines the intensity of the output laser beam.  A disadvantage of the known scheme is the impossibility of an adjustable deviation of one or several OUTPUT 1 rays.  The aim of the invention is to extend the functionality of the circuit by adjustable deflection of a portion of the outgoing optical rays.  This goal is achieved by the fact that in the control scheme for the formation of several laser output beams located in one plane based on the Bragg diffraction law and including an acoustic-optical element containing at least one ultrasonic transducer, high-frequency oscillators in the ultrasonic frequency band which are connected to the at least one ultrasonic transducer via the corresponding master stages, the frequencies of all the high frequency oscillators determining the output angles of the high-frequency oscillators, there is at least one variable-frequency oscillator, which is equipped with a frequency-determining input, the acoustic acoustic element is equipped with several electrically separated ultrasonic transducers, to which connected in at least one master cascade.  To jointly move the output of each laser beam emanating from the acousto-optic element, between the master stages and the associated ultrasound transducers, one mixing stage is provided, and the second inputs of the mixing stages are connected to a common auxiliary oscillator of the controlled frequency.  FIG.  1 shows a block diagram of a first embodiment of the proposed circuit in FIG.  2 is a block diagram of a second embodiment of the circuit; FIG. 3 block diagram of the third form of the circuit; Hia FIG. 4 is a diagram of the time dependence of the angle of the laser beam exit from the acoustic-optical element at the indicated control of oscillators, explaining the operation of the first 8. 4 three forms of the scheme; in fig.  5 - block diagram of the molarized third form of the circuit in which the exit angles of all the output laser beams can be adjusted together; in fig. A bug diagram showing the principle of operation of the circuit shown in FIG.  five.  The proposed scheme includes laser beam 1, acoustic-optical element 2, ultrasonic transducers 3 angle 4 deviations, oscillators 5 of constant frequency, I specify stages 6, amplifiers 7, laser beam 8 coming out of the converter at frequencies, control inputs 9 electrical control voltages, driving cascades 10, laser beam 11 coming out of the converter at a different frequency, driving control inputs 12, electrical voltage inputs 13, summarizing cascades I, mixing cascades 15, which have the first input 16 and the secondan input 17, an auxiliary oscillator 18 with a voltage control input 19 Acoustic-optical element 2 of the modulator in FIG.  1 is formed from an optically transparent medium in the form of a rectangular prism.  The purpose of the acoustic-optical element 2 is to form from the incident beam 1 of the laser, according to a specific control program, several independent output beams 8 and 11 of the laser.  Beam 1 laser enters the smaller one.  the end surface of the prism-shaped acoustic-optical modulator 2 and cut, with its axis parallel to the plane of the ultrasound wave front, the angle of deflection, the so-called Bragg angle.  On the lower side plane of the acoustic-optical element 2 along the direction of propagation of the incident beam 1 of the laser are placed several electrically separated from each other ultrasonic transducers 3, which in the direction of the laser beam are long enough to be in an acoustic-optical modulator 2, as in a medium, Any ultrasound transducer created an ultrasonic field that achieves the Bragg acoustic diffraction of light. If such material is chosen for an acoustic optical medium.  as, for example, water or Te02 single crystal of paratellurite type (Miller index software in the crystallographic direction) or calomel single crystal (Miller index in the crystallographic direction), where the ultrasound propagation speed is small, the length of the ultrasonic transducer 3 can be small, preferably in the range of 1-3 mm.  The acoustic-optical element 2 installed in this way differs in that if its ultrasonic transducers 3 are controlled by oscillator signals of the corresponding high-frequency band, then due to the diffractions from the input beam 1 of the laser in the acoustic-optical medium, such output beams are formed, the output angle of which deviates from the direction of the output of the incident beam 1 of the laser.  The size of this deviation depends on the time, frequency, or IK of the high frequency signal or control signals supplied by the IK ultrasonic transducer.  With control at the specified frequency, the intensity of the output beams 8 and 11 of the laser with the output angle corresponding to this frequency depends on the amplitude of the control signal of the specified frequency.  This definition is valid for any ultrasound transducer 3, t. e.  every ultrasound. The converter can be controlled by one or several high-frequency oscillators, while the control frequencies with respect to the output laser beams 8 and 11 within the defined areas operate independently of each other.  It is also possible that several ultrasonic transducers 3 are controlled by the same frequency, each of which causes such an acoustic-optical medium: diffraction in which the exit angles of the respective output beams 8 and 11 of the laser coincide with the exit angle of the output beam of the laser controlled by the same frequency by another ultrasound transducer, whence it follows that the intensity of the corresponding frequency of the output beam 8 and 11 is determined by the combined amplitude of the attached ltrazvukovym preobral86 zovatel m 3 agreed with equal frequency oscillator kovoy tori.  Since, with regard to the production of laser output beams 8 and 11, ultrasonic transducers 3 can generally be regarded as uniformly made, the acoustic-optical element 2 can be preset as having a single high-power ultrasonic transducer and high-frequency oscillators connected to it effect their influence linearly, independently of each other.  Ultrasonic transducers 3 can be separated from each other, since a single ultrasonic transducer — due to imperfect electrical modules (the emergence of mutual modulation and damping of summing circuits) cannot be connected to high-frequency oscillators with as large a number and power as possible.  The described properties do not appear only in the acoust. o-optical modulators shown in FIG.  1-3 and 5 when the ultrasonic transducers 3 are located in the same plane of the side surfaces of the prismatic element.  They can be placed in suitable dimensions on different but parallel planes, or the acoustic-optical element 2 can also be assembled from several separate OTHERS separated from each other, but optically connected.  An acoustic-optical element can also be used. Ultrasonic transducers of which are made to form laser output beams for said linear overlap.  The power of the ultrasound transducers of the 3 high-frequency oscillators must be chosen so large that we can neglect the effect of the repeated repeated diffraction on the refracted beams, which is caused by the ultrasound transducer field excited by another inside the acoustic-optical sphere of the element.  This condition is satisfied if the total intensity of each laser output from the acoustic-optical element of the refracted beam of the laser is less than 0.4-0.5 times the intensity of the input beam 1 of the laser. In this case, each refracted output laser beam receives energy.  from the energy of the input beam T of the laser.  The acousto-optical element 2 can be controlled in various ways.  Identical with respect to management.  The functions of the circuit elements in FIG.   and B are bounded by dashed lines.  These elements are electrically independent of each other and take part in control times; The first ultrasonic transducers 3 The same figure indicates the equality of functions. The values of the frequencies of oscillators 5 of constant frequency (Fig.  1) remain unchanged during operation and are different from each other.  The frequencies of the individual oscillators 5 are indicated, a. .  Oscilla tori 10 reg. frequency, oscillators 5, are designed in such a way that their operating frequencies can be adjusted depending on the electrical voltages connected to the corresponding frequency-determining inputs 13 within the frequency range of the adjustable frequency of the individual oscillators 10 adjustable frequency, it is advisable to choose without overlap, so that, for example, the frequency band of the first oscillator j1O is determined by the frequency limits fa and fan, and accordingly the frequency band of the nth oscillator is determined by fn and fn An oscillating oscillator, a motor 5 and 10, respectively, are connected in one master cascade 6, In the simplest case, the master cascades 6 are implemented with an electronic switch that, depending on the electrical control voltages connected to the corresponding control inputs 9, guides the oscillator signal torus or blocks his path.  These driving cascades b can be mounted so that in addition to the resolution and prohibition of incoming movement, the applied voltage of the oscillators would change.  The inputs 12 of the control of the master stages are matched with oscillators of the adjustable frequency 10.  Each driver stage 6 is connected via an amplifier 7 to an ultrasonic transducer 3 of an acoustic-optical element.  Amplifiers 7 increase the output voltage of oscillators to the appropriate level and from; Oscillators from ultrasonic transducers 3 are divided.  When turning on the circuit according to 5 of FIG.  1, each oscillator 5 of an adjustable frequency respectively creates a single output laser beam, the output angle of which depends on the given constant frequency of the corresponding oscillators.  If the frequency bands of the adjustable frequency oscillators 10 do not overlap and are different from the frequencies of the oscillators 5 at a constant frequency, each oscillator 10 creates lines of the laser with adjustable output angles.  These exit angles of the beams 8 and 11 of the laser change during operation within the region of the angle corresponding to the operating frequency bands of the associated oscillators 10. .  Given the above conditions, the output angles of each output beam 8 and 11 of the laser are different,.  laser output paths do not intersect.  The control affecting the stage and the stage 6, as well as the control of the frequency-determining inputs 13, can affect the course of the output laser beams, depending on the desired target.  The circuit in FIG.  2 differs from the previous one in that between master stages 6 and amplifiers 7, summing stages are provided, which are linear summing circuits with several inputs, and output of master stage 6 is connected to each input.  The use of summing cascades allows to increase the number of 3 oscillators attached to the ultrasonic transducer up to the number of inputs of the summing stages.  In the example shown in FIG. In case of each summing cascade, C has m inputs and n groups are formed from oscillators of 5 constant frequency, from which they get the frequency of the last oscillator for f, and.  The inputs of the summing cascade I matched with the latest ultrasound transducer S are connected to the master cascade 6, with an oscillator 10 of adjustable frequency matched.  If the summing cascades lA are linear and elementary, and each ultrasonic transducer 3 is equivalent to the acoustic-optical element 2 in terms of excited output / laser beams, the circuit in FIG. 2 is not different from the operation of the circuit in FIG. 1. several oscillates of torbvs.  The difference of the circuit in FIG. From the previous one is that oscillators 10 of the frequency under control are not connected to a single adder H and through it to the combined ultrasonic converter 3, and one of the inputs of each adder I is connected to one of the oscillators 10 The number of inputs of summing stages 1 in FIG.  3 per unit more than in FIG. 2; The linearity condition described above implies the possibility of forming several combinations, and one adder can be connected to several oscillators 10 and t, d, in the simplest case. In the simplest case, the number of ultrasonic transducers 3 is one acoustic-optical. element 2 is not more than two, one being connected to one of the oscillators 5 of a constant frequency, the other to the oscillator 10 of an adjustable frequency.  It is not more difficult if the acoustic-optical element 2 contains only one ultrasonic transducer 3, to which one of the summing stages 11 is connected, so that one of the inputs is connected to an oscillator 5 of a constant frequency and the other with an oscillator 10 of an adjustable frequency .  In practice, it is most expedient to use at least constant-frequency oscillators. In the control example shown in FIG. K, the control example shows the passage of the time of the constant-8 laser beam and the alternating 11 yyle output from the acoustic-optical element 2.  The control according to FIG. A can be implemented according to any of the diagrams of FIG. 1-3. According to the control diagram of eleven laser beams of a constant exit angle and three laser beams of a variable exit angle of FIG, the left vertical axis indicates the exit angle and the right corresponding frequencies oscillator torus.  The frequencies of the oscillators 5 of a constant frequency are divided into two groups: the first group includes the frequencies -f I which occupy the frequency band 8b, the second frequency group f ,,,, f, which falls into the band 8a, In the bands 8a and 8b all output laser beams of fixed exit angles are contained.  The master cascades 6 coordinated with them can only affect the erasure and, accordingly, the occurrence of, for example, the intensity of the track line. All output rays P of the laser of the adjustable exit angle {in FIG.  k three output beams) respectively occupy the range of angles of Na, lib and 11 s.  As can be seen from Fig. 4, the triangular form voltages of various frequencies are connected to the frequency inputs of the adjustable frequency oscillators 10 of adjustable frequency.  If all the laser beams deviate parallel to the time axis of FIG. 4, then the diagram indicates the lines of the laser beam path.  If the frequency of the voltage tr. The angular shapes are quite large, then the beams 11 of a variable-angle laser illuminate one entire strip, respectively, which is preferable in the indicated application cases (for example, allocating the distance between the rows or highlighting the strip).  Of course, it is possible that individual lanes overlap with each other or empty zones appear between them.  The circuit in FIG.  5 is based mainly on the switching principle of FIG. 3.  The difference is that between the summing cascades T and the amplifiers 7 there are included mixing stages 15 each of which has a first input 16 and a second input 17.  Each first input 1b is connected to the outputs coordinated with the mixing cascades of summing cascades.  All second inputs 17 are connected to each other and connected to the output of the auxiliary oscillator 18 of the controlled frequency.  The frequency of the auxiliary oscillator 18 of the controlled frequency can be varied in the steps of the band between the values of the frequencies F and F using a voltage connected to the control input 19.  Mixing cascades 15 create a differential or total frequency supplied to their first input 16 and the second input 17 of the high-frequency signals.  The result of this mixing is controlling the ultrasound with new transducers 3 of the acoustic-optical element.  It is advisable that the amplifiers 7 be matched bandpass amplifiers, the KOTopiiie ultrasound transducers 3 are only the products of the frequencies J that fall into the desired band, since the ultrasonic transducers in one way or another have the properties of locking the bands.  Preferably, such a choice of frequencies so that the difference frequencies fall on the useful band of ultrasonic transducers 3.  FIG.   and FIG. 4 shows the temporal dependence of the laser output beams, but for the circuit of FIG.  5) whereby a control voltage is applied to the control input 19 of the auxiliary oscillator with a characteristic passage in time and the frequency follows this voltage.  From FIG. 6, it can be seen that the k-shape of the line shown in FIG. Imitates the measurement of the yen of the control voltage of the auxiliary oscillator, so that all of the laser output beams are simultaneously shifted to the same extent.  It is advisable to use this offset for general correction and, accordingly, precise adjustment of the laser output beam location. In the case of using an acoustic-optical modulator in a laser sign generator, the laser output beams determine, for example, vertical points of one form or one sign, and vertical lines with respect to the direction of propagation, the scanning of the rays forms a record of a sequence of characters.  By controlling the auxiliary oscillator 18, the position of the characters (e.g., the vertical position) can be precisely controlled.  The embodiment of the circuit of FIG.  j and 6 makes it possible to occur along with exiting with a constant angle of Exit from the aka. of a laser-optical element 2 by laser beams, laser output beams with a looping: the position of the angle (t. e.  line) in the same output plane and adjusting the position of the angle of all the laser output beams while maintaining the output plane (t. e.  within it). Both possibilities can be reused in most common applications of acoustic-optical modulators, especially in laser, character generators, optical recording devices or laser facsimiles.  Claim 1, Laser beam control circuit, associated with Bragg diffraction, which contains an acoustic-optical element, at least one ultrasonic transducer, high-frequency oscillators in the ultrasonic frequency band, connected through appropriate master stages At least one ultrasonic transducer , and at the same time each master stage has a control input, the state of which defines the amplitude of the signal of the corresponding oscillator, characterized in that, in order to expand audio functionality by adjustment of the angle of the laser beam output, at least odinostsill torus is formed with an adjustable frequency and comprises specifying a frequency input.  2, a control circuit according to claim 1, characterized in that several master stages are connected to each ultrasound transducer through joint summing stages,
[3]
3. A control circuit in accordance with claim 2, characterized in that at least one master oscillator connected to the oscillator of the adjustable frequency is connected to each joint summing stage. k. Management scheme for PP. 1-3, characterized by the fact that the ultrasonic transducers are connected to the outputs of master circuits through amplifiers, 5, control circuit according to claims 4, 1-4, characterized in that one auxiliary oscillator is inserted into E1, and the inputs of all amplifiers, respectively the cascade is connected to the auxiliary oscillator of the controlled frequency. Sources of information taken into account during the examination 1, Rebrin Yu, E, Optical beam control in space, M, Soviet Radio, 1977, p. 138, 2, German Federal Law tf 2755575, cl. G 02 F 1/33, 1979 (prototype). / / k% ys E%; %% yI 1% y ;; y1 tiagj fi 13 9
“V
:
类似技术:
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US3609009A|1971-09-28|Binary light beam deflector using acoustic waves
US3419322A|1968-12-31|Ultrasonic transducer matching for bragg reflection scanning
US3502879A|1970-03-24|Light scanning device
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US4628473A|1986-12-09|System for autocorrelating optical radiation signals
同族专利:
公开号 | 公开日
DE3064475D1|1983-09-08|
EP0018150B1|1983-08-03|
DD150816A5|1981-09-16|
US4371964A|1983-02-01|
HU180848B|1983-04-29|
AT4396T|1983-08-15|
JPS55142313A|1980-11-06|
PL128757B1|1984-02-29|
EP0018150A1|1980-10-29|
PL223587A1|1981-02-27|
引用文献:
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法律状态:
优先权:
申请号 | 申请日 | 专利标题
HU79MA3134A|HU180848B|1979-04-18|1979-04-18|Multiple acoustooptical,multiray intensity modulator and ray deflector|
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