CN112230451A - Control circuit of double-path acousto-optic modulator and control method thereof - Google Patents
Control circuit of double-path acousto-optic modulator and control method thereof Download PDFInfo
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- CN112230451A CN112230451A CN202011230225.8A CN202011230225A CN112230451A CN 112230451 A CN112230451 A CN 112230451A CN 202011230225 A CN202011230225 A CN 202011230225A CN 112230451 A CN112230451 A CN 112230451A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/11—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
- G02F1/113—Circuit or control arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
Abstract
The invention relates to a control circuit and a control method of a two-way acousto-optic modulator.A communication interface is connected with an MPU (micro processing unit), the MPU is connected with an input pin of an FPGA (field programmable gate array), and further connected with a bus end of an I2C data processing module, and the MPU is connected with a digital/analog converter; the digital/analog converter is respectively connected with the first acousto-optic modulator and the second acousto-optic modulator; the frequency input interface is connected to an input pin of the FPGA and further connected to the frequency doubling module; the output of the frequency multiplication module is connected to the input pin of the fundamental frequency generator; an output data bus of the I2C data processing module is respectively connected to a data input port of the fundamental frequency generator, a data input port of the first frequency division module and a data input port of the second frequency division module; the output of the fundamental frequency generator is connected with the input end of the first frequency division module and the input end of the second frequency division module; the output of the frequency division module I is connected with the input end of the acousto-optic modulator I; and the output of the second frequency division module is connected with the input end of the second acousto-optic modulator. And realizing the independent light power control of the two lasers.
Description
Technical Field
The invention relates to a control circuit of a double-path acousto-optic modulator and a control method thereof.
Background
In industrial laser applications, some materials need to be processed with different wavelengths, different repetition rates and different powers, and achieving dual wavelengths on a single laser is certainly the best solution, both in terms of cost and packaging space.
Therefore, a control circuit of a dual-path acousto-optic modulator in dual-wavelength laser needs to be designed to realize independent control of the two paths of laser.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a control circuit of a double-path acousto-optic modulator and a control method thereof.
The purpose of the invention is realized by the following technical scheme:
the control circuit of the two-way acousto-optic modulator is characterized in that: the FPGA comprises an I2C data processing module, an I2C data processing module, a base frequency generator, a frequency division module I and a frequency division module II, a communication interface is connected with a communication end of the MPU, an I2C bus of the MPU is connected with an input pin of the FPGA and further connected with a bus end of the I2C data processing module, and an I2C bus of the MPU is connected with a bus end of the digital/analog converter; two paths of outputs of the digital/analog converter are respectively connected with an analog input pin of the acousto-optic modulator I and an analog input pin of the acousto-optic modulator II; the frequency input interface is connected to an input pin of the FPGA and further connected to the frequency doubling module; the output of the frequency multiplication module is connected to the input pin of the fundamental frequency generator; an output data bus of the I2C data processing module is respectively connected to a data input port of the fundamental frequency generator, a data input port of the first frequency division module and a data input port of the second frequency division module; the output of the fundamental frequency generator is connected with the input end of the first frequency division module and the input end of the second frequency division module; the output of the frequency division module I is connected with the input end of the acousto-optic modulator I; and the output of the second frequency division module is connected with the input end of the second acousto-optic modulator.
Further, in the control circuit of the two-way acoustic-optical modulator, the MPU is an MPU of model STM32F103 by ideological semiconductor corporation.
Further, in the control circuit of the two-way acousto-optic modulator, the digital-to-analog converter is a digital-to-analog converter of ADI model AD 5647R.
Further, in the control circuit of the two-way acousto-optic modulator, the FPGA is an FPGA of Xilinx corporation Spartan6 series model XC6SLX 4.
The invention relates to a control method of a double-path acousto-optic modulator.A host computer sends an instruction to an MPU (micro processing unit) through a communication interface, and sets the working fundamental frequency of a laser, the repetition frequencies of two paths of lasers and the corresponding optical power; the MPU sends out data through an I2C bus according to the received instruction, if the set frequency is relevant, the data is sent to an I2C data processing module, if the set power is relevant, the data is sent to a digital/analog converter; inputting a seed light frequency signal of 25MHz of a laser by adopting a frequency input interface;
after a 25MHz frequency signal is input into a frequency doubling module, quadruple frequency is carried out to generate a clock signal of 100MHz, and then the clock signal is input into a fundamental frequency generator, because the repetition frequency of a picosecond laser is generally 50 kHz-1 MHz, and the laser single pulse energy corresponding to different fundamental frequencies is different; the I2C data processing module identifies the data processing sent by the MPU, and comprises a fundamental frequency parameter, a frequency division parameter of the acousto-optic modulator and a frequency division parameter of the acousto-optic modulator, if the fundamental frequency parameter is the fundamental frequency parameter, the data is sent to the fundamental frequency generator, if the frequency division parameter of the acousto-optic modulator is the frequency division parameter, the data is sent to the frequency division module I, and if the frequency division parameter of the acousto-optic modulator is the two frequency division parameter, the data is sent to the frequency division module II;
after the fundamental frequency parameters are sent to the fundamental frequency generator, frequency division is carried out on the 100MHz clock signal generated by the frequency doubling module to generate the required fundamental frequency; after a fundamental frequency signal generated by the fundamental frequency generator and a frequency division parameter of the acousto-optic modulator output by the I2C data processing module are input into the frequency division module, a first repetition frequency is generated and then input into the acousto-optic modulator I; the fundamental frequency signal generated by the fundamental frequency generator and the two-frequency-division parameter of the acousto-optic modulator output by the I2C data processing module are input into the frequency division module II to generate a repetition frequency II, and then are input into the acousto-optic modulator II;
the analog-to-digital converter receives the laser power digital quantity data of the MPU, then converts the laser power digital quantity data into analog quantity output, and the two analog quantity outputs of the analog-to-digital converter are respectively input to the acousto-optic modulator I and the acousto-optic modulator II to change the diffraction efficiency of the acousto-optic modulator, so that the laser power is changed.
Compared with the prior art, the invention has obvious advantages and beneficial effects, and is embodied in the following aspects:
firstly, the invention realizes the synchronization of the system output frequency and the optical signal by using the self frequency of the mode-locked laser as a clock;
secondly, the FPGA is used as a bridge, and the repeated frequency setting of the two paths of acousto-optic modulators is realized by adopting a parameter setting mode, so that the independent control is realized; thereby realizing the independent light power control of the two lasers;
thirdly, the frequency of the seed light is multiplied by adopting a frequency multiplication technology, and then the frequency is divided according to the requirement, so that the precision of the repetition frequency is improved, and the consistency of the phase of the seed light and the phase of the output laser is ensured;
the change of fundamental frequency, laser repetition frequency and optical power is realized through a parameter setting mode, the repetition frequency and the power can be independently set through two paths of lasers, the operation is simple and convenient, the circuit design structure is simple, and the cost is low.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1: schematic diagram of the control circuit of the present invention;
FIG. 2: a time sequence waveform diagram generated by a clock and two-way repetition frequency.
The meanings of the reference symbols in the figures are given in the following table:
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the directional terms and the sequence terms, etc. are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, the control circuit of the two-way acousto-optic modulator includes an MPU2, an FPGA3 and a digital/analog converter 7, where the FPGA3 includes an I2C data processing module 301, an I2C data processing module 302, a fundamental frequency generator 303, a first frequency division module 304 and a second frequency division module 305, the communication interface 1 is connected to a communication terminal of the MPU2, an I2C bus of the MPU2 is connected to an input pin of the FPGA3 and further connected to a bus terminal of the I2C data processing module 301, and an I2C bus of the MPU2 is connected to a bus terminal of the digital/analog converter 7; two paths of outputs of the digital/analog converter 7 are respectively connected with an analog input pin of the acousto-optic modulator I5 and an analog input pin of the acousto-optic modulator II 6; the frequency input interface 4 is connected to an input pin of the FPGA3 and further connected to the frequency doubling module 301; the output of the frequency doubling module 301 is connected to the input pin of the fundamental frequency generator 303; the output data bus of the I2C data processing module 302 is connected to the data input port of the baseband generator 303, the data input port of the first divider module 304, and the data input port of the second divider module 305, respectively; the output of the fundamental frequency generator 303 is connected with the input end of the first frequency division module 304 and the input end of the second frequency division module 305; the output end of the frequency division module I304 is connected with the input end of the acousto-optic modulator I5; and the output of the second frequency division module 305 is connected with the input end of the second acousto-optic modulator 6.
The MPU2 is an MPU of Italian semiconductor corporation model STM32F103, has a pipeline instruction set, and is high in execution speed and rich in hardware interfaces.
The digital-to-analog converter 7 is a digital-to-analog converter of ADI model AD5647R, has an internal reference voltage, 14-bit precision and simple interface.
The FPGA3 is an FPGA of Xilinx Spartan6 series model XC6SLX4, adopts ISE software carried by Xilinx, has rich library elements and IP cores, and can be directly called; the I2C data processing module 301, the I2C data processing module 302, the fundamental frequency generator 303, the frequency dividing module I304 and the frequency dividing module II 305 are constructed by an I2C IP core, a 16-bit register, a digital clock processing module, a 16-bit counter and a multiplexer which are called and developed by the FPGA.
When the laser is applied specifically, the upper computer sends an instruction to the MPU2 through the communication interface 1, and the working fundamental frequency of the laser, the repetition frequencies of the two paths of laser and the corresponding optical power are set; the MPU2 sends out data through the I2C bus according to the received command, if the set frequency is related, the data is sent to the I2C data processing module 302, and if the set power is related, the data is sent to the digital/analog converter 7; in the circuit system, a crystal oscillator or other clock signal generators are not used as clock signals of the circuit, but a seed optical frequency signal of 25MHz of a laser is input by a frequency input interface 4, so that the laser pulse is consistent or synchronous with the system clock signal and the repetition frequency phase of the laser, and if the crystal oscillator is used as a system clock, the phase difference is generated with the optical pulse signal along with the working time, and the optical power is unstable;
the bridge part of the whole circuit is FPGA3, XC6SLX4 of Xilinx company is adopted, and the bridge part is provided with a digital phase-locked loop frequency multiplication module, an I2C interface module and the like, and has a plurality of digital input and output pins, and the highest clock rate can reach 220 MHz; after a 25MHz frequency signal is input into the frequency doubling module 301, quadruple frequency is carried out to generate a clock signal of 100MHz, and then the clock signal is input into the fundamental frequency generator 303, because the repetition frequency of a picosecond laser is generally 50 kHz-1 MHz, and the laser single pulse energy corresponding to different fundamental frequencies is different; the I2C data processing module 302 identifies the data processing sent by the MPU2, including a fundamental frequency parameter, a frequency division parameter of the acousto-optic modulator, and sends the data to the fundamental frequency generator 303 if the fundamental frequency parameter is present, sends the data to the first frequency division module 304 if the frequency division parameter of the acousto-optic modulator is present, and sends the data to the second frequency division module 305 if the frequency division parameter of the acousto-optic modulator is present;
after the fundamental frequency parameters are sent to the fundamental frequency generator 303, frequency division is performed on the 100MHz clock signal generated by the frequency doubling module 301 to generate the required fundamental frequency, and since two laser paths are provided and a user can set the two laser paths to different repetition frequencies, two different frequency dividers are required to divide the fundamental frequency signal again; the fundamental frequency signal generated by the fundamental frequency generator 303 and a frequency division parameter of the acousto-optic modulator output by the I2C data processing module 302 are input into the frequency division module 304 to generate a first repetition frequency, and then input into the acousto-optic modulator one 5; the fundamental frequency signal generated by the fundamental frequency generator 303 and the two-frequency division parameter of the acousto-optic modulator output by the I2C data processing module 302 are input into the frequency division module two 305 to generate a repetition frequency two, and then are input into the acousto-optic modulator two 6; the time sequence waveforms generated by the clock and the two-way repetition frequency are shown in fig. 2;
the analog/digital converter 7 receives the laser power digital quantity data of the MPU2 and then converts the laser power digital quantity data into analog quantity output, and the two analog quantity outputs of the analog/digital converter 7 are respectively input to the acousto-optic modulator I5 and the acousto-optic modulator II 6 to change the diffraction efficiency of the acousto-optic modulator, so that the laser power is changed.
The synchronization of the system output frequency and the optical signal is realized by using the self frequency of the mode-locked laser as a clock.
A Programmable Gate Array (FPGA) is taken as a bridge, and a parameter setting mode is adopted to realize the setting of the repetition frequency of two paths of Acousto-optic Modulators (AOM), thereby realizing independent control. And further, the independent light power control of the two lasers is realized.
In summary, the frequency doubling technology is adopted to frequency-double the seed light frequency, and then frequency division is performed according to needs, so that not only is the precision of the repetition frequency improved, but also the consistency of the seed light and the output laser phase is ensured; meanwhile, the change of the fundamental frequency, the laser repetition frequency and the light power is realized through a parameter setting mode, the repetition frequency and the power can be independently set through two paths of lasers, the operation is simple and convenient, the circuit design structure is simple, and the cost is low.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and shall be covered by the scope of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (5)
1. Control circuit of double-circuit reputation modulator, its characterized in that: the FPGA (3) comprises an I2C data processing module (301), an I2C data processing module (302), a base frequency generator (303), a frequency division module I (304) and a frequency division module II (305), a communication interface (1) is connected with a communication end of the MPU (2), an I2C bus of the MPU (2) is connected with an input pin of the FPGA (3) and further connected with a bus end of the I2C data processing module (301), and an I2C bus of the MPU (2) is connected with a bus end of the digital/analog converter (7); two paths of outputs of the digital/analog converter (7) are respectively connected with an analog input pin of the acousto-optic modulator I (5) and an analog input pin of the acousto-optic modulator II (6); the frequency input interface (4) is connected to an input pin of the FPGA (3) and further connected to the frequency doubling module (301); the output of the frequency multiplication module (301) is connected to the input pin of the fundamental frequency generator (303); the output data bus of the I2C data processing module (302) is connected to the data input port of the fundamental frequency generator (303), the data input port of the divide-by-module one (304), and the data input port of the divide-by-module two (305), respectively; the output of the fundamental frequency generator (303) is connected with the input end of the first frequency division module (304) and the input end of the second frequency division module (305); the output end of the frequency division module I (304) is connected with the input end of the acousto-optic modulator I (5); and the output of the frequency division module II (305) is connected with the input end of the acousto-optic modulator II (6).
2. The control circuit of a two-way acousto-optic modulator according to claim 1, characterized in that: MPU (2) is an MPU of model STM32F103 by Italian semiconductor.
3. The control circuit of a two-way acousto-optic modulator according to claim 1, characterized in that: the FPGA (3) is an FPGA of Xilinx Spartan6 series model XC6SLX 4.
4. The control circuit of a two-way acousto-optic modulator according to claim 1, characterized in that: the digital/analog converter (7) is a digital/analog converter of ADI model AD 5647R.
5. The control circuit of claim 1, wherein the control circuit implements a control method for a dual-path acousto-optic modulator, characterized in that: the upper computer sends an instruction to the MPU (2) through the communication interface (1), and sets the working fundamental frequency of the laser, the repetition frequencies of the two paths of laser and the corresponding optical power; the MPU (2) sends out data through an I2C bus according to the received command, if the set frequency is relevant, the data is sent to an I2C data processing module (302), if the set power is relevant, the data is sent to a digital/analog converter (7); a frequency input interface (4) is adopted to input a seed optical frequency signal of 25MHz of a laser;
after being input into a frequency doubling module (301), 25MHz frequency signals are subjected to quadruple frequency to generate 100MHz clock signals, and then the 100MHz clock signals are input into a fundamental frequency generator (303), and because the repetition frequency of a picosecond laser is generally 50 kHz-1 MHz, the laser single pulse energy corresponding to different fundamental frequencies is different; the I2C data processing module (302) identifies the data processing sent by the MPU (2), and has a fundamental frequency parameter, a frequency division parameter of the acousto-optic modulator and a frequency division parameter of the acousto-optic modulator, if the fundamental frequency parameter is the fundamental frequency parameter, the data is sent to the fundamental frequency generator (303), if the frequency division parameter of the acousto-optic modulator is the frequency division parameter, the data is sent to the frequency division module I (304), and if the frequency division parameter of the acousto-optic modulator is the frequency division parameter of the acousto-optic modulator, the data is;
after the fundamental frequency parameters are sent to a fundamental frequency generator (303), frequency division is carried out on the 100MHz clock signal generated by the frequency multiplication module (301) so as to generate the required fundamental frequency; the fundamental frequency signal generated by the fundamental frequency generator (303) and a frequency division parameter of the acousto-optic modulator output by the I2C data processing module (302) are input into the frequency division module (304) to generate a first repetition frequency, and then are input into the acousto-optic modulator (5); the fundamental frequency signal generated by the fundamental frequency generator (303) and the two-frequency division parameter of the acousto-optic modulator output by the I2C data processing module (302) are input into the frequency division module II (305) to generate a repetition frequency II, and then are input into the acousto-optic modulator II (6);
an analog/digital converter (7) receives laser power digital quantity data of the MPU (2) and converts the laser power digital quantity data into analog quantity output, two analog quantity outputs of the analog/digital converter (7) are respectively input to a first acousto-optic modulator (5) and a second acousto-optic modulator (6), and the diffraction efficiency of the acousto-optic modulators is changed, so that the laser power is changed.
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