CN111525385A - High-precision pulse POD control method and circuit of femtosecond fiber laser - Google Patents
High-precision pulse POD control method and circuit of femtosecond fiber laser Download PDFInfo
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- CN111525385A CN111525385A CN202010628185.6A CN202010628185A CN111525385A CN 111525385 A CN111525385 A CN 111525385A CN 202010628185 A CN202010628185 A CN 202010628185A CN 111525385 A CN111525385 A CN 111525385A
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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
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
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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
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
Abstract
The invention belongs to the technical field of optical communication, and particularly provides a high-precision pulse POD control method and circuit of a femtosecond fiber laser, which comprises a time sequence circuit, a seed clock circuit and an AOM drive circuit, wherein the seed clock circuit is connected with the time sequence circuit, and the AOM drive circuit is connected with the time sequence circuit; the seed clock circuit is used for converting seed laser pulses into clock signals and transmitting the clock signals to the time sequence circuit, the time sequence circuit is used for outputting modulation pulse signals to the AOM drive circuit according to the seed clock signals and received external trigger signals, and the AOM drive circuit is used for screening the laser pulses sent by the femtosecond fiber laser according to the modulation pulse signals. A POD control circuit is designed in the femtosecond optical fiber laser, so that the synchronization between the output laser and an external trigger signal is ensured. By means of outstanding low-jitter and high-precision triggering performance, the femtosecond fiber laser can be synchronously matched with an advanced scanning galvanometer and a motion platform at a high speed for use, and the processing effect and efficiency are greatly improved.
Description
Technical Field
The invention belongs to the technical field of optical communication, and particularly relates to a high-precision pulse POD control method and circuit of a femtosecond fiber laser.
Background
The femtosecond fiber laser has very high instantaneous power due to short pulse action time, and has very small Heat Affected Zone (HAZ) to the processed material, so that the femtosecond fiber laser is increasingly applied to the field of precision processing. When the laser is used for processing a complex pattern through a galvanometer, the scanning speed of the galvanometer is inevitably changed due to the switching of a straight line part and a curved line part in the pattern, and if a fixed pulse repetition frequency is used, the laser stays for too long in the curved line part, so that a heat affected zone is enlarged, and the processing effect is directly influenced. In the prior art, the laser power fluctuation caused by the change of the output frequency of the laser is caused by directly changing the output frequency of the laser, and the switching speed is low, so that the processing effect is greatly influenced.
The existing femtosecond fiber laser pulse selection technology has defects or can not be realized on the following technologies: 1. the high-energy laser with the frequency of 1KHz-10MHz cannot be selected from the high-energy laser pulse with the repetition frequency of 50 MHz; 2. when an external trigger signal is selected, two laser synchronous output modes of GATE and TRIG cannot be realized, pulse laser with set repetition frequency is synchronously output according to the external trigger signal in the GATE mode, and single pulse laser is synchronously output according to the external trigger signal in the TRIG mode; 3. in both the GATE and TRIG output modes, the delay jitter between the laser pulse and the synchronization signal (i.e., the POD control accuracy) may not be constrained to within 25 ns.
Disclosure of Invention
The invention aims to solve the problems that high-energy laser pulses with the frequency of 1KHz-10MHz cannot be selected from high-energy laser pulses with the repetition frequency of 50MHz and delay jitter can be restricted within 25ns in the prior art.
Therefore, the invention provides a femtosecond fiber laser high-precision pulse POD control method, which comprises the following steps:
s1: outputting seed laser to a seed clock circuit after the femtosecond fiber laser is powered on, wherein the seed clock circuit generates a seed clock signal to provide a time sequence reference for a time sequence circuit;
s2: if the internal control mode is selected to work, the time sequence circuit outputs the modulation pulse signals of the 2-stage AOM to the AOM driving circuit according to the seed clock signals and the set repetition frequency so as to respectively drive the 2-stage AOM;
if the external control mode is selected to work, the timing circuit captures an external trigger signal, then a seed clock signal is synchronized with the external trigger signal, then a counter is set to zero, and the generation of a 2-level AOM digital signal is restarted according to a set value, and the 2-level AOM digital signal is output to an AOM driving circuit after being modulated by an AOM modulation circuit;
s3: the AOM driving circuit receives the 2-level modulation pulse signal and respectively controls the 1 st-level AOM and the 2 nd-level AOM to carry out switching, thereby screening the laser pulse.
Preferably, the step S1 specifically includes:
and the FPGA in the time sequence circuit receives a seed clock signal sent by the seed clock circuit, and pre-generates an AOM digital signal input to the AOM modulation circuit through logic time sequence control in the FPGA.
Preferably, the step S2 specifically includes:
if the internal control mode is selected to work, the control logic in the FPGA outputs the AOM digital signal generated by the seed clock signal to an AOM modulation circuit for modulation, and then outputs the AOM digital signal to an AOM driving circuit to be used as a control signal for screening laser pulses;
if the external control mode is selected to work, the single chip microcomputer in the time sequence circuit issues an FPGA external control trigger mode instruction, the FPGA receives an external trigger signal and synchronizes with a seed clock signal, the synchronized signal rising edge triggers the FPGA to complete the zero setting of a counter and regenerate an AOM digital signal, and then the AOM digital signal is output to an AOM modulation circuit to be modulated and then output to an AOM driving circuit.
Preferably, it is characterized in that: the external control mode comprises two working modes of GATE and TRIG;
under the GATE mode, outputting laser pulses and continuously outputting the laser pulses with set repetition frequency when an external trigger signal is at a high level;
in the TRIG mode, the frequency of the output laser pulse is kept consistent with the frequency of the external trigger signal.
The invention also provides a high-precision pulse POD control circuit of the femtosecond fiber laser, which comprises a time sequence circuit, a seed clock circuit and an AOM drive circuit, wherein the seed clock circuit is connected with the time sequence circuit, and the AOM drive circuit is connected with the time sequence circuit;
the seed clock circuit is used for converting seed laser pulses into clock signals and transmitting the clock signals to the time sequence circuit, the time sequence circuit is used for outputting modulation pulse signals to the AOM drive circuit according to the seed clock signals and received external trigger signals, and the AOM drive circuit is used for screening the laser pulses sent by the femtosecond fiber laser according to the modulation pulse signals.
Preferably, the sequential circuit comprises an FPGA for logic sequential control and a singlechip for communication control.
Preferably, the timing circuit adopts an externally input TTL level signal as an external trigger signal, after receiving the external trigger signal, the FPGA synchronizes with a seed signal clock, and then synchronously generates an AOM digital signal according to a signal rising edge after synchronization, and the AOM digital signal is modulated by pulse width adjustment, delay, and the like and then input into the AOM driving circuit to drive the 2-stage AOM switch to screen the laser pulse.
Preferably, the sequential circuit comprises a CPU and an AOM modulation circuit;
and the CPU receives the seed clock signal sent by the seed clock circuit and pre-generates an AOM digital signal input to the AOM modulation circuit through logic time sequence control.
Preferably, the sequential circuit further comprises an RS232 interface and an external trigger interface;
the RS232 interface is connected with the external trigger interface, and the RS232 interface is used for connecting debugging software to read and set parameters.
The invention has the beneficial effects that: the invention provides a high-precision pulse POD control method and circuit of a femtosecond fiber laser, which comprises a time sequence circuit, a seed clock circuit and an AOM drive circuit, wherein the seed clock circuit is connected with the time sequence circuit; the seed clock circuit is used for converting seed laser pulses into clock signals and transmitting the clock signals to the time sequence circuit, the time sequence circuit is used for outputting modulation pulse signals to the AOM drive circuit according to the seed clock signals and received external trigger signals, and the AOM drive circuit is used for screening the laser pulses sent by the femtosecond fiber laser according to the modulation pulse signals. The POD control circuit is designed in the femtosecond fiber laser, and the driving signals of two stages of AOMs of the laser are synchronously adjusted through the external trigger signal, so that the synchronization between the output laser and the external trigger signal is ensured; meanwhile, a clock signal with higher frequency is used in the synchronization process so as to reduce jitter brought by synchronization of different time domain signals as much as possible. By means of outstanding low-jitter and high-precision triggering performance, the femtosecond fiber laser can be synchronously matched with an advanced scanning galvanometer and a motion platform at a high speed for use, and the processing effect and efficiency are greatly improved.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of the operating principle of the high-precision pulse POD control method and circuit of the femtosecond fiber laser of the invention;
FIG. 2 is a timing circuit control block diagram of the high-precision pulse POD control method and circuit of the femtosecond fiber laser;
fig. 3 is a logic timing diagram of the high-precision pulse POD control method and circuit of the femtosecond fiber laser according to the invention.
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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
An embodiment of the present invention provides a femtosecond fiber laser high-precision pulse POD control method, as shown in fig. 1 to 3, including the following steps:
s1: outputting seed laser to a seed clock circuit after the femtosecond fiber laser is powered on, wherein the seed clock circuit generates a seed clock signal to provide a time sequence reference for a time sequence circuit;
s2: if the internal control mode is selected to work, the time sequence circuit outputs the modulation pulse signals of the 2-stage AOM to the AOM driving circuit according to the seed clock signals and the set repetition frequency so as to respectively drive the 2-stage AOM;
if the external control mode is selected to work, the timing circuit captures an external trigger signal, then a seed clock signal is synchronized with the external trigger signal, then a counter is set to zero, and the generation of a 2-level AOM digital signal is restarted according to a set value, and the 2-level AOM digital signal is output to an AOM driving circuit after being modulated by an AOM modulation circuit;
s3: the AOM driving circuit receives the 2-level modulation pulse signal and respectively controls the 1 st-level AOM and the 2 nd-level AOM to carry out switching, thereby screening the laser pulse.
Preferably, the step S1 specifically includes:
the FPGA in the timing circuit 1 receives the seed clock signal sent by the seed clock circuit 2, and generates a 2-level modulation signal input to the AOM driving circuit 3 through logic timing control in the FPGA.
Preferably, the step S2 specifically includes:
if the internal control mode is selected to work, the control logic in the FPGA outputs the AOM digital signal generated by the seed clock signal to the AOM modulation circuit for modulation and then outputs the AOM digital signal to the AOM driving circuit 3 as a control signal for screening laser pulses;
if an external control mode is selected for working, a singlechip in the time sequence circuit 1 issues an FPGA external control trigger mode instruction, the FPGA receives an external trigger signal and synchronizes with a seed clock signal, the synchronized signal rising edge triggers the FPGA to complete the zero setting of a counter and regenerate an AOM digital signal, and then the AOM digital signal is output to an AOM modulation circuit for modulation and then output to an AOM driving circuit 3; in addition, the external control mode has two working modes of GATE and TRIG, wherein in the GATE mode, the output laser pulse continuously outputs the laser pulse with the set repetition frequency when the external trigger signal is at high level; in the TRIG mode, the frequency of the output laser pulse is kept consistent with the frequency of the external trigger signal.
The invention also provides a high-precision pulse POD control circuit of the femtosecond fiber laser, as shown in fig. 1 to fig. 3, which comprises a time sequence circuit, a seed clock circuit and an AOM drive circuit, wherein the seed clock circuit is connected with the time sequence circuit, and the AOM drive circuit is connected with the time sequence circuit; the seed clock circuit is used for converting seed laser pulses into clock signals and transmitting the clock signals to the time sequence circuit, the time sequence circuit is used for outputting modulation pulse signals to the AOM drive circuit according to the seed clock signals and received external trigger signals, and the AOM drive circuit is used for screening the laser pulses sent by the femtosecond fiber laser according to the modulation pulse signals.
Specifically, as shown in fig. 1, an embodiment of the present invention provides a femtosecond fiber laser high-precision pulse POD control circuit, which includes a timing circuit 1, a seed clock circuit 2, and an AOM drive circuit 3, where the AOM drive circuit 3 is connected to the timing circuit 1, the seed clock circuit 2 is configured to convert a seed laser pulse into a clock signal and transmit the clock signal to the timing circuit 1, the timing circuit 1 is configured to output a modulation pulse signal to the AOM drive circuit 3 according to the seed clock laser pulse signal and an received external trigger signal, and the AOM drive circuit 3 is configured to screen a laser pulse emitted by a femtosecond fiber laser according to the modulation pulse signal so as to output a laser pulse meeting requirements.
Specifically, as shown in fig. 2, in the preferred embodiment, the sequential circuit 1 includes an FPGA for logic sequential control and a single chip for communication control. The sequential circuit 1 is triggered by adopting an external frequency signal, and the FPGA outputs laser pulses with the same frequency as or the same order as the external trigger signal frequency (TRIG mode) to output a fixed frequency (GATE mode) after receiving the external trigger signal and synchronizing with a seed clock signal. When the femtosecond fiber laser works in an external control mode, the FPGA receives an external trigger signal, after the external trigger signal is synchronized with a seed clock signal, a single (TRIG mode) or a plurality of (GATE mode) continuous AOM digital signals are output according to set parameters, then the AOM digital signals are subjected to pulse width adjustment, delay and the like to generate AOM modulation signals, and the AOM drive circuit 3 is controlled through the AOM modulation signals. The sequential circuit further comprises a CPU, an AOM modulation circuit, an RS232 interface and an external trigger interface, wherein the RS232 interface is used for connecting debugging software to read and set parameters.
The invention has the following beneficial effects:
the high-precision pulse POD control circuit of the femtosecond fiber laser can accurately select any required femtosecond laser pulse from high-energy femtosecond laser pulses up to 50 MHz;
the POD control function of the femtosecond fiber laser can be realized, and the laser pulse frequency can change along with the external control signal in real time;
the time sequence circuit 1 can be set through debugging software, and the switching of two modes of modifying the frequency selection range on line and switching the internal control mode and the external control mode in real time can be realized;
the seed clock provided by the seed clock circuit 3 with higher frequency is used for synchronization, so that the delay jitter between the external trigger signal and the output laser pulse is not more than 25 ns;
through the screening of 2-level AOM, the range of the repetition frequency of the output laser pulse in the internal control mode is expanded to 1KHz-10MHz, and the repetition frequency of the output laser pulse can be adjusted in real time along with an external trigger signal in the external control mode, so that the problem that the range of the repetition frequency of the femtosecond fiber laser is limited is solved.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (7)
1. A femtosecond fiber laser high-precision pulse POD control method is characterized by comprising the following steps:
s1: outputting seed laser to a seed clock circuit after the femtosecond fiber laser is powered on, wherein the seed clock circuit generates a seed clock signal to provide a time sequence reference for a time sequence circuit;
s2: if the internal control mode is selected to work, the time sequence circuit outputs the modulation pulse signals of the 2-stage AOM to the AOM driving circuit according to the seed clock signals and the set repetition frequency so as to respectively drive the 2-stage AOM; specifically, a control logic in the FPGA outputs an AOM digital signal generated by a seed clock signal to an AOM modulation circuit for modulation, and then outputs the AOM digital signal to an AOM driving circuit as a control signal for screening laser pulses;
if the external control mode is selected to work, the timing circuit captures an external trigger signal, then a seed clock signal is synchronized with the external trigger signal, then a counter is set to zero, and the generation of a 2-level AOM digital signal is restarted according to a set value, and the 2-level AOM digital signal is output to an AOM driving circuit after being modulated by an AOM modulation circuit; specifically, a single chip microcomputer in the time sequence circuit issues an FPGA external control trigger mode instruction, the FPGA receives an external trigger signal and synchronizes with a seed clock signal, the synchronized signal rising edge triggers the FPGA to complete the zero setting of a counter and regenerate an AOM digital signal, and then the AOM digital signal is output to an AOM modulation circuit to be modulated and then output to an AOM driving circuit;
s3: the AOM driving circuit receives the 2-level modulation pulse signal and respectively controls the 1 st-level AOM and the 2 nd-level AOM to carry out switching, thereby screening the laser pulse.
2. The femtosecond fiber laser high-precision pulse POD control method according to claim 1, wherein the step S1 specifically comprises:
and the FPGA in the time sequence circuit receives a seed clock signal sent by the seed clock circuit, and pre-generates an AOM digital signal input to the AOM modulation circuit through logic time sequence control in the FPGA.
3. The femtosecond fiber laser high-precision pulse POD control method according to claim 1, wherein: the external control mode comprises two working modes of GATE and TRIG;
under the GATE mode, outputting laser pulses and continuously outputting the laser pulses with set repetition frequency when an external trigger signal is at a high level;
in the TRIG mode, the frequency of the output laser pulse is kept consistent with the frequency of the external trigger signal.
4. The utility model provides a femto second fiber laser high accuracy pulse POD control circuit which characterized in that: the system comprises a time sequence circuit, a seed clock circuit and an AOM drive circuit, wherein the seed clock circuit is connected with the time sequence circuit, and the AOM drive circuit is connected with the time sequence circuit;
the seed clock circuit is used for converting seed laser pulses into clock signals and transmitting the clock signals to the time sequence circuit, the time sequence circuit is used for outputting modulation pulse signals to the AOM drive circuit according to the seed clock signals and received external trigger signals, and the AOM drive circuit is used for screening the laser pulses sent by the femtosecond fiber laser according to the modulation pulse signals;
the time sequence circuit adopts an externally input TTL level signal as an external trigger signal, after receiving the external trigger signal, the FPGA synchronizes with a seed signal clock firstly, then generates an AOM digital signal synchronously according to the signal rising edge after synchronization, and the AOM digital signal is modulated by pulse width adjustment, delay and the like and then is input into the AOM driving circuit to drive the 2-level AOM switch to screen laser pulses.
5. The femtosecond fiber laser high-precision pulse POD control circuit according to claim 4, wherein: the sequential circuit comprises an FPGA for logic sequential control and a singlechip for communication control.
6. The femtosecond fiber laser high-precision pulse POD control circuit according to claim 4, wherein: the sequential circuit comprises a CPU and an AOM modulation circuit;
and the CPU receives the seed clock signal sent by the seed clock circuit and pre-generates an AOM digital signal input to the AOM modulation circuit through logic time sequence control.
7. The femtosecond fiber laser high-precision pulse POD control circuit according to claim 6, wherein: the sequential circuit also comprises an RS232 interface and an external trigger interface;
the RS232 interface is connected with the external trigger interface, and the RS232 interface is used for connecting debugging software to read and set parameters.
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| CN112311470A (en) * | 2020-10-31 | 2021-02-02 | 中国电子科技集团公司第二十六研究所 | Control method based on double-AOM (automatic optical network management) cascade structure and acousto-optic cascade module |
| CN113422284A (en) * | 2021-06-23 | 2021-09-21 | 天津凯普林激光科技有限公司 | Random trigger control method, random trigger control system and laser system |
| CN114101940A (en) * | 2020-08-25 | 2022-03-01 | 财团法人工业技术研究院 | Synchronous photoelectric drive control system and method |
| CN114122883A (en) * | 2021-11-19 | 2022-03-01 | 北京盛镭科技有限公司 | Industrial ultrafast laser electrical control system |
| CN115621831A (en) * | 2022-12-02 | 2023-01-17 | 北京盛镭科技有限公司 | Control method and system for dynamically adjusting number of BURST pulses |
| CN116493787A (en) * | 2023-06-21 | 2023-07-28 | 深圳市圭华智能科技有限公司 | Synchronous trigger system for micron-sized laser and motion platform position |
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| CN114122883A (en) * | 2021-11-19 | 2022-03-01 | 北京盛镭科技有限公司 | Industrial ultrafast laser electrical control system |
| CN115621831A (en) * | 2022-12-02 | 2023-01-17 | 北京盛镭科技有限公司 | Control method and system for dynamically adjusting number of BURST pulses |
| CN116493787A (en) * | 2023-06-21 | 2023-07-28 | 深圳市圭华智能科技有限公司 | Synchronous trigger system for micron-sized laser and motion platform position |
| CN116493787B (en) * | 2023-06-21 | 2023-11-28 | 深圳市圭华智能科技有限公司 | Synchronous trigger system for micron-sized laser and motion platform position |
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| CN111525385B (en) | 2020-12-18 |
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