CN112230451B - 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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- CN112230451B CN112230451B CN202011230225.8A CN202011230225A CN112230451B CN 112230451 B CN112230451 B CN 112230451B CN 202011230225 A CN202011230225 A CN 202011230225A CN 112230451 B CN112230451 B CN 112230451B
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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 double-path acousto-optic modulator.A communication interface is connected with an MPU, the MPU is connected with an FPGA input pin, and then is connected with a bus end of an I2C data processing module, and the MPU is connected with a digital-to-analog converter; the digital-to-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 then connected to the frequency doubling module; the output of the frequency doubling module is connected to the input pin of the fundamental frequency generator; the output data bus of the I2C data processing module is respectively connected to the data input port of the fundamental frequency generator, the data input port of the first frequency dividing module and the data input port of the second frequency dividing module; the output of the fundamental frequency generator is connected with the input end of the first frequency dividing module and the input end of the second frequency dividing module; the output of the frequency dividing module I is connected with the input end of the acousto-optic modulator I; the output of the frequency dividing module II is connected with the input end of the acousto-optic modulator II. Independent optical power control of the two paths of lasers is realized.
Description
Technical Field
The invention relates to a control circuit of a two-way acousto-optic modulator and a control method thereof.
Background
In industrial laser applications, some materials require processing with different wavelengths, different repetition rates, and different powers, and it is clearly the best solution to achieve dual wavelengths on a single laser, both in terms of cost and assembly space.
Therefore, a control circuit of a two-way acousto-optic modulator in the dual-wavelength laser is required to be designed, so that the independent control of the two-way laser is realized.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a control circuit and a control method of a two-way acousto-optic modulator.
The aim of the invention is achieved by the following technical scheme:
the control circuit of the double-path acousto-optic modulator is characterized in that: the digital-to-analog converter comprises an MPU, an FPGA and a digital-to-analog converter, wherein the FPGA comprises a frequency doubling module, an I2C data processing module, a fundamental frequency generator, a frequency dividing module I and a frequency dividing 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 then connected to a bus end of the I2C data processing module, and an I2C bus of the MPU is connected to a bus end of the digital-to-analog converter; two paths of output of the digital-to-analog converter are respectively connected with an analog input pin of the first acousto-optic modulator and an analog input pin of the second acousto-optic modulator; the frequency input interface is connected to an input pin of the FPGA and then connected to the frequency doubling module; the output of the frequency doubling module is connected to the input pin of the fundamental frequency generator; the output data bus of the I2C data processing module is respectively connected to the data input port of the fundamental frequency generator, the data input port of the first frequency dividing module and the data input port of the second frequency dividing module; the output of the fundamental frequency generator is connected with the input end of the first frequency dividing module and the input end of the second frequency dividing module; the output of the frequency dividing module I is connected with the input end of the acousto-optic modulator I; the output of the frequency dividing module II is connected with the input end of the acousto-optic modulator II.
Further, in the control circuit of the two-way acousto-optic modulator, the MPU is an MPU of an schematic semiconductor company model STM32F 103.
Further, in the control circuit of the two-way acousto-optic modulator, the digital-to-analog converter is a digital-to-analog converter of model AD5647R of ADI company.
Further, in the control circuit of the two-way acousto-optic modulator, the FPGA is an FPGA of the Xilinx Spartan6 series model XC6SLX 4.
The invention relates to a control method of a double-path acousto-optic modulator, which comprises the steps that an upper computer sends an instruction to an MPU through a communication interface, and the working fundamental frequency of a laser, the repetition frequency of two paths of lasers and the corresponding optical power are set; the MPU sends out data through the I2C bus according to the received instruction, if the frequency is set to be relevant, the data is sent to the I2C data processing module, and if the power is set to be relevant, the data is sent to the digital-to-analog converter; a frequency input interface is adopted to input a seed light frequency signal of 25MHz of the laser;
the 25MHz frequency signal is input into the frequency multiplication module for four times frequency multiplication to generate a 100MHz clock signal, and then is input into the fundamental frequency generator, and the repetition frequency of the picosecond laser is generally 50 kHz-1 MHz, and the laser single pulse energy corresponding to different fundamental frequencies is also different; the I2C data processing module is used for identifying data processing sent by the MPU, wherein the data processing module comprises a fundamental frequency parameter, an acousto-optic modulator one-frequency dividing parameter and an acousto-optic modulator two-frequency dividing parameter, the data is sent to the fundamental frequency generator if the fundamental frequency parameter, the data is sent to the first frequency dividing module if the acousto-optic modulator one-frequency dividing parameter, and the data is sent to the second frequency dividing module if the acousto-optic modulator two-frequency dividing parameter;
after the fundamental frequency parameters are sent to the fundamental frequency generator, the 100MHz clock signal generated by the frequency doubling module is divided to generate the required fundamental frequency; the fundamental frequency signal generated by the fundamental frequency generator and the first frequency dividing parameter of the acousto-optic modulator output by the I2C data processing module are input into the frequency dividing module to generate a first repetition frequency, and then are input into the first acousto-optic modulator; the fundamental frequency signal generated by the fundamental frequency generator and the two frequency dividing parameters of the acousto-optic modulator output by the I2C data processing module are input into the frequency dividing 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 data of the MPU and then converts the laser power digital data into analog output, and the two analog output of the analog-to-digital converter are respectively input into the first acousto-optic modulator and the second acousto-optic modulator to change the diffraction efficiency of the first acousto-optic modulator so as to change the laser power.
Compared with the prior art, the invention has remarkable advantages and beneficial effects, and is specifically embodied in the following aspects:
(1) according to the invention, the frequency of the mode-locked laser is used as a clock, so that the synchronization of the system output frequency and the optical signal is realized;
(2) 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 independent control is realized; thereby realizing the independent optical power control of the two paths of lasers;
(3) the seed light frequency is multiplied by adopting a frequency multiplication technology, and then frequency division is carried out according to the requirement, so that the precision of the repetition frequency is improved, and the consistency of the seed light and the output laser phase is ensured;
(4) the change of fundamental frequency, laser repetition frequency and optical power is realized through a parameter setting mode, the repetition frequency and the power of two paths of lasers can be set independently, 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 apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may 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 that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1: schematic diagram of the control circuit of the present invention;
fig. 2: timing waveforms for clock generation and two-way repetition frequency generation are shown.
The meaning of the reference numerals in the figures is given in the following table:
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The components of the 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 invention, as 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 made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present invention, directional terms, order 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 comprises an MPU2, an FPGA3 and a digital-to-analog converter 7, wherein the FPGA3 comprises a frequency doubling module 301, an I2C data processing module 302, a fundamental frequency generator 303, a frequency dividing module one 304 and a frequency dividing module two 305, the communication interface 1 is connected with a communication end of the MPU2, an I2C bus of the MPU2 is connected with an input pin of the FPGA3 and then is connected with a bus end of the I2C data processing module 302, and an I2C bus of the MPU2 is connected with a bus end of the digital-to-analog converter 7; two paths of outputs of the digital-to-analog converter 7 are respectively connected with an analog input pin of the first acousto-optic modulator 5 and an analog input pin of the second acousto-optic modulator 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 frequency dividing module one 304 and the data input port of the frequency dividing module two 305, respectively; the output of the fundamental frequency generator 303 is connected with the input end of the frequency dividing module I304 and the input end of the frequency dividing module II 305; the output of the frequency dividing module I304 is connected with the input end of the acousto-optic modulator I5; the output of the frequency dividing module II 305 is connected with the input end of the acousto-optic modulator II 6.
The MPU2 is an MPU of an STM32F103 model of an legal semiconductor company, has a pipeline instruction set, and has high execution speed and rich hardware interfaces.
The digital-to-analog converter 7 is the digital-to-analog converter of model AD5647R of ADI company, with internal reference voltage, 14-bit precision and simple interface.
The FPGA3 is an FPGA of Xilinx company Spartan6 series model XC6SLX4, adopts ISE software carried by the Xilinx company, has rich library elements and IP cores, and can be directly called; the frequency multiplication module 301, the I2C data processing module 302, the fundamental frequency generator 303, the frequency division module I304 and the frequency division 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 in an FPGA call development software library element.
When the laser is particularly applied, the upper computer sends an instruction to the MPU2 through the communication interface 1, and the working fundamental frequency of the laser, the repetition frequency of two paths of lasers and the corresponding optical power are set; the MPU2 sends out data through the I2C bus according to the received instruction, if the frequency is set to be relevant, the data is sent to the I2C data processing module 302, and if the power is set to be relevant, the data is sent to the digital-to-analog converter 7; in the circuit system, a crystal oscillator or other clock signal generator is not used as a clock signal of a circuit, but a frequency input interface 4 is used for inputting a seed light frequency signal of 25MHz of a laser, so that the laser pulse, a system clock signal and the repetition frequency phase of the laser are consistent or synchronous, if the crystal oscillator is used as a system clock, a phase difference is generated with the light pulse signal along with the working time, and finally the light power is unstable;
the bridge part of the whole circuit is FPGA3, XC6SLX4 of Xilinx company is adopted, the digital phase-locked loop frequency doubling module, the I2C interface module and the like are provided, the number of digital input pins and the number of digital output pins are large, and the highest clock rate can reach 220MHz; the 25MHz frequency signal is input into the frequency multiplication module 301 for four times frequency multiplication to generate a 100MHz clock signal, and then is input into the fundamental frequency generator 303, and the repetition frequency of the picosecond laser is generally 50 kHz-1 MHz, and the laser single pulse energy corresponding to different fundamental frequencies is also different; the I2C data processing module 302 identifies the data processing sent by the MPU2, including a fundamental frequency parameter, an acousto-optic modulator one frequency division parameter, and an acousto-optic modulator two frequency division parameter, if the fundamental frequency parameter is the fundamental frequency parameter, the data is sent to the fundamental frequency generator 303, if the acousto-optic modulator one frequency division parameter is the frequency division module one 304, and if the acousto-optic modulator two frequency division parameter is the frequency division module two 305;
after the fundamental frequency parameter is sent to the fundamental frequency generator 303, the 100MHz clock signal generated by the frequency doubling module 301 is divided to generate the required fundamental frequency, and because the fundamental frequency is two-way laser, and the user will set the two-way laser 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 the first frequency dividing parameter of the acousto-optic modulator output by the I2C data processing module 302 are input to the frequency dividing module 304 to generate a first repetition frequency, and then input to the first acousto-optic modulator 5; the fundamental frequency signal generated by the fundamental frequency generator 303 and the two frequency dividing parameters of the acousto-optic modulator output by the I2C data processing module 302 are input into the frequency dividing module II 305 to generate a repetition frequency II, and then are input into the acousto-optic modulator II 6; the time sequence waveforms of clock generation and two paths of repetition frequency generation are shown in fig. 2;
the analog-to-digital converter 7 receives the laser power digital data of the MPU2 and then converts the laser power digital data into analog output, and the two analog output of the analog-to-digital converter 7 are respectively input to the first and second acousto-optic modulators 5 and 6 to change the diffraction efficiency of the acousto-optic modulators, thereby changing the laser power.
And the frequency of the mode-locked laser is used as a clock, so that the synchronization of the output frequency of the system and the optical signal is realized.
A programmable logic gate array (Field Programmable Gate Array, abbreviated as FPGA) is used as a bridge, and the repetition frequency of two paths of Acousto-optic modulators (Acouston-optical Modulators, abbreviated as AOM) is set in a parameter setting mode, so that independent control is realized. And further realizes the independent optical power control of the two paths of lasers.
In summary, the invention adopts the frequency multiplication technology to multiply the seed light frequency, and then divides the frequency according to the need, thereby not only improving the precision of the repetition frequency, but also ensuring the consistency of the seed light and the output laser phase; meanwhile, the change of fundamental frequency, laser repetition frequency and optical power is realized through a parameter setting mode, the repetition frequency and power of two paths of lasers can be set independently, the operation is simple and convenient, the circuit design structure is simple, and the cost is low.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. 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 numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily appreciate variations or alternatives within the scope of the present invention.
It is noted that relational terms such as first and second, and the like are 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. Moreover, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (5)
1. Control circuit of double-circuit acousto-optic modulator, its characterized in that: the digital-to-analog converter comprises an MPU (2), an FPGA (3) and a digital-to-analog converter (7), wherein the FPGA (3) comprises a frequency doubling module (301), an I2C data processing module (302), a fundamental frequency generator (303), a frequency dividing module I (304) and a frequency dividing module II (305), the 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 then connected to a bus end of the I2C data processing module (302), and an I2C bus of the MPU (2) is connected to a bus end of the digital-to-analog converter (7); two paths of outputs of the digital-to-analog converter (7) are respectively connected with an analog input pin of the first acousto-optic modulator (5) and an analog input pin of the second acousto-optic modulator (6); the frequency input interface (4) is connected to an input pin of the FPGA (3) and then 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 respectively connected to the data input port of the fundamental frequency generator (303), the data input port of the frequency dividing module I (304) and the data input port of the frequency dividing module II (305); the output of the fundamental frequency generator (303) is connected with the input end of the frequency dividing module I (304) and the input end of the frequency dividing module II (305); the output of the frequency dividing module I (304) is connected with the input end of the acousto-optic modulator I (5); the output of the frequency dividing 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, wherein: the MPU (2) is an MPU of an Italian semiconductor company model STM32F 103.
3. The control circuit of a two-way acousto-optic modulator according to claim 1, wherein: the FPGA (3) is the FPGA of Xilinx company Spartan6 series model XC6SLX 4.
4. The control circuit of a two-way acousto-optic modulator according to claim 1, wherein: the digital-to-analog converter (7) is a digital-to-analog converter of ADI company model AD 5647R.
5. The control method for realizing the two-way acousto-optic modulator by using the control circuit as claimed in claim 1, wherein the control method comprises the following steps: the upper computer sends an instruction to the MPU (2) through the communication interface (1), and the working fundamental frequency of the laser, the repetition frequency of two paths of lasers and the corresponding optical power are set; the MPU (2) sends data out through an I2C bus according to the received instruction, if the frequency is set to be related, the data is sent to an I2C data processing module (302), and if the power is set to be related, the data is sent to a digital-to-analog converter (7); a frequency input interface (4) is adopted to input seed light frequency signals of 25MHz of the laser;
the 25MHz frequency signal is input into a frequency multiplication module (301) for four times frequency multiplication to generate a 100MHz clock signal, and then is input into a fundamental frequency generator (303), and the repetition frequency of the picosecond laser is generally 50 kHz-1 MHz, and the laser single pulse energy corresponding to different fundamental frequencies is also different; the I2C data processing module (302) identifies the data processing sent by the MPU (2), wherein the data processing comprises a fundamental frequency parameter, an acousto-optic modulator one-frequency dividing parameter and an acousto-optic modulator two-frequency dividing parameter, the data is sent to the fundamental frequency generator (303) if the fundamental frequency parameter, the data is sent to the frequency dividing module one (304) if the acousto-optic modulator one-frequency dividing parameter, and the data is sent to the frequency dividing module two (305) if the acousto-optic modulator two-frequency dividing parameter;
after the fundamental frequency parameters are sent to the fundamental frequency generator (303), the 100MHz clock signal generated by the frequency doubling module (301) is divided to generate the required fundamental frequency; the fundamental frequency signal generated by the fundamental frequency generator (303) and the first frequency dividing parameter of the acousto-optic modulator output by the I2C data processing module (302) are input into the frequency dividing module (304) to generate first repetition frequency, and then are input into the first acousto-optic modulator (5); the fundamental frequency signal generated by the fundamental frequency generator (303) and the two frequency dividing parameters of the acousto-optic modulator output by the I2C data processing module (302) are input into the frequency dividing module II (305) to generate a repetition frequency II, and then input into the acousto-optic modulator II (6);
the analog-to-digital converter (7) receives the laser power digital data of the MPU (2) and then converts the laser power digital data into analog output, and two analog output of the analog-to-digital converter (7) are respectively input into the first acousto-optic modulator (5) and the second acousto-optic modulator (6) to change the diffraction efficiency of the acousto-optic modulator, so that the laser power is changed.
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