CN113422284B - Random trigger control method, random trigger control system and laser system - Google Patents

Random trigger control method, random trigger control system and laser system Download PDF

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CN113422284B
CN113422284B CN202110696750.7A CN202110696750A CN113422284B CN 113422284 B CN113422284 B CN 113422284B CN 202110696750 A CN202110696750 A CN 202110696750A CN 113422284 B CN113422284 B CN 113422284B
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CN113422284A (en
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王铁男
李少北
陈洪亮
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Tianjin Kaipulin Laser Technology Co ltd
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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
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/0912—Electronics or drivers for the pump source, i.e. details of drivers or circuitry specific for laser pumping
    • 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
    • H01S3/10084—Frequency control by seeding

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Abstract

The application provides a random trigger control method and random trigger control methodThe machine trigger control system and the laser system, wherein the random trigger control method comprises the following steps: receiving a TRIG signal and preprocessing the TRIG signal; timing is started at the arrival time of the rising edge of each TRIG signal, and a second light-emitting signal is output; determining the time t from the beginning1When the next TRIG signal is not received within the time, every taOutputting a first light-emitting signal in time; determining the time t from the beginning1When the next TRIG signal is received in time, the time is delayed by tbAnd outputting a first light-emitting signal after time. Through the steps, the TRIG signal is not limited by the set frequency of the laser, the consistency of control logic is ensured, and the phenomenon of point loss is avoided.

Description

Random trigger control method, random trigger control system and laser system
Technical Field
The present disclosure generally relates to the field of control, and more particularly to a random trigger control method, a random trigger control system and a laser system.
Background
The external control interface of the picosecond laser generally has a TRIG interface for receiving a TRIG signal; an FPGA module, a primary optical fiber modulator and a secondary spatial modulator for emitting light are arranged in the laser;
the FPGA module respectively controls the primary optical fiber modulator and the secondary spatial modulator to be started by outputting a first light-emitting signal and a second light-emitting signal, and then controls the laser to output laser.
In the prior art, a control method for laser triggering includes: firstly, setting the frequencies of a first light-emitting signal and a second light-emitting signal in the FPGA, wherein the first light-emitting signal is an integral multiple of the second light-emitting signal; when the FPGA module acquires the TRIG signal and the rising edge of the second light-emitting signal is triggered, the FPGA module outputs the first light-emitting signal and the second light-emitting signal to control the two modulators to be opened, and then the output laser is controlled.
In this way, the frequency of the external control signal TRIG is matched with the set frequency of the outgoing light signal, otherwise, the outgoing light is disturbed, and the frequency of the TRIG signal is limited. On the basis, even if a laser fixed frequency synchronizing signal is added, the synchronizing signal is referred when an external signal is generated, although the consistency of the light emitting time (POD mode) after the system is restarted every time can be ensured, the frequency of the TRIG signal is still less than or equal to the set frequency of the light emitting signal of the laser; due to the existence of the set frequency of the laser, the missing point phenomenon can occur when the TRIG signal and the set frequency are not synchronous.
Disclosure of Invention
In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide a random trigger control method, a random trigger control system and a laser system for controlling an outgoing light signal by a TRIG signal.
In a first aspect, the present application provides a random trigger control method, including the following steps:
receiving a TRIG signal and preprocessing the TRIG signal; timing is started at the arrival time of the rising edge of each TRIG signal, and a second light-emitting signal is output;
determining the time t from the beginning1When the next TRIG signal is not received within the time, every taOutputting a first light-emitting signal in time;
determining the time t from the beginning1When the next TRIG signal is received in time, the time is delayed by tbAnd outputting a first light-emitting signal after time.
According to the technical scheme provided by the embodiment of the application, the frequency f of the TRIG signal satisfies the following conditions: f. of1≤f≤f2；
t1、ta、tbIs a preset value and meets the following requirements:
Figure BDA0003128180310000021
according to the technical scheme provided by the embodiment of the application, the method for preprocessing the TRIG signal specifically comprises the following steps: and carrying out two-stage synchronous processing on the TRIG signal.
In a second aspect, the present application provides a random trigger control system, including an FPGA module; the FPGA module comprises a receiving unit, a processing unit, an output unit and a clock unit;
the receiving unit is configured to receive a TRIG signal;
the output unit is configured to output a first light-emitting signal and a second light-emitting signal;
the clock unit is configured to clock and output clock data starting at the arrival time of the rising edge of each TRIG signal; the clock data comprises timing starting information and timing time;
the processing unit is configured to: preprocessing the TRIG signal; acquiring clock data; when the timing starting information is acquired, controlling the output unit to output a second light emitting signal; judging that the timing time is more than t1Then controlling the output unit to every taOutputting a first light-emitting signal in time; judging that the timing time is less than or equal to t1When it is, then at tbAnd after time, controlling the output unit to output a first light-emitting signal.
According to the technical scheme provided by the embodiment of the application, the frequency f of the TRIG signal satisfies the following conditions: f. of1≤f≤f2；t1、ta、tbIs a preset value and meets the following requirements:
Figure BDA0003128180310000022
in a third aspect, the present application provides a laser system, comprising a laser module and the random trigger control system as described above;
the laser module comprises a primary optical fiber modulator and a first driving unit; a secondary spatial modulator, a second drive unit; and a pump source;
the first driving unit is used for receiving the first light-emitting signal and controlling the primary optical fiber modulator to be started; the second driving unit is used for receiving the second light-emitting signal and controlling the secondary spatial modulator to be started;
the pumping source is used for outputting signal light, and the signal light outputs laser after passing through the primary optical fiber modulator and the secondary spatial modulator.
The beneficial effect of this application lies in: based on the technical scheme provided by the application, the frequency of the TRIG signals is not limited, namely, the time is started to be counted when the rising edge of each TRIG signal arrivesAnd outputting a second light-emitting signal; the time when the next TRIG signal arrives exceeds t1Time, then last taStopping receiving the TRIG signal and outputting a first light-emitting signal; when the next TRIG signal is at t1When the time comes, then at tbAnd outputting a first light-emitting signal after time. In the above manner, the first outgoing optical signal and the second outgoing optical signal are generated by following the TRIG signal and the corresponding logical relationship thereof, so that the phenomenon of point loss when the outgoing optical signal with the set frequency and the TRIG signal are asynchronous in the prior art is avoided. The TRIG signal is not limited by the set frequency, and the consistency of control logic is guaranteed.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a flowchart of a random trigger control method provided in the present application;
FIG. 2 is a schematic diagram of a random trigger control system provided herein;
fig. 3 is a schematic diagram of a laser system provided in the present application.
Reference numbers in the figures:
100. an FPGA module; 101. a receiving unit; 102, and (b); a processing unit; 103. an output unit; 104. a clock unit; 200. a laser module; 201. a primary fiber optic modulator; 202. a first drive unit; 203. a secondary spatial modulator; 204. a second driving unit; 205. a pump source.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1
Please refer to fig. 1, which is a flowchart of a random trigger control method provided in the present application, including the following steps:
s100: receiving a TRIG signal and preprocessing the TRIG signal; timing is started at the arrival time of the rising edge of each TRIG signal, and a second light-emitting signal is output;
s200: determining the time t from the beginning1When the next TRIG signal is not received within the time, every taOutputting a first light-emitting signal in time;
determining the time t from the beginning1When the next TRIG signal is received in time, the time is delayed by tbAnd outputting a first light-emitting signal after time.
As can be known by those skilled in the art, the TRIG signal is an external trigger signal, for example, the TRIG interface can implement light emission control of the laser by using a signal edge triggering mode;
the first light-emitting signal can be used for starting a primary optical fiber modulator of the laser, and the second light-emitting signal can be used for starting a secondary spatial modulator of the laser.
The working principle is as follows: in the prior art, the frequencies of the first light-emitting signal and the second light-emitting signal need to be set in the FPGA module, and it is ensured that the frequency of the first light-emitting signal is an integral multiple of the frequency of the second light-emitting signal. When the FPGA module acquires the TRIG signal and the rising edge of the second light-emitting signal is triggered, the FPGA module outputs the first light-emitting signal and the second light-emitting signal, controls the two modulators to be opened and further controls the output laser; because the frequency of the external control signal TRIG needs to be matched with the set frequency of the light-emitting signal, otherwise, the light-emitting is disordered, the frequency of the TRIG signal is limited, and meanwhile, when the TRIG signal fluctuates or the frequency of the TRIG signal is not matched with the set frequency, the phenomenon of point loss is caused.
According to the random trigger control method, the frequency of the TRIG signals is not limited, namely, when the arrival time of the rising edge of each TRIG signal starts to be timed, and a second light-emitting signal is output; at presentThe time of arrival of a TRIG signal exceeds t1At time, every taOutputting a first light-emitting signal in time; when the next TRIG signal is at t1When the time comes, the time is delayed by tbAnd outputting a first light-emitting signal after time. Therefore, in the above manner, it is not necessary to fixedly set the frequencies of the first outgoing optical signal and the second outgoing optical signal, that is: the first light-emitting signal and the second light-emitting signal can be directly correspondingly output along with the TRIG signal and the logic relation, so that the primary optical fiber modulator and the secondary spatial modulator can be controlled to be opened and closed and correspondingly output laser; the consistency of the control logic is ensured, and the phenomenon of point loss is avoided.
Furthermore, the first-level optical fiber modulator is usually high in speed, and controllable accuracy is in picosecond level; the secondary spatial modulator is relatively slow; in the method, since the timing is started at the arrival time of the rising edge of each TRIG signal and the second light-emitting signal is output, when the TRIG frequency is greater than the threshold value of the secondary spatial modulator, the light-emitting is only related to the primary optical fiber modulator and is not related to the secondary spatial modulator, so that the laser can operate at a higher frequency, and the radio frequency instability caused by the switching of the secondary spatial modulator is avoided, which cannot be achieved by the common TRIG trigger mode.
Meanwhile, the light-emitting energy of the primary optical fiber modulator of the picosecond laser is a threshold of damage, for the pump light, the lower the frequency is, the higher the energy is, and the frequency is in inverse proportion to the time, so that the primary optical fiber modulator is easily damaged due to continuous light holding; in the present application, t is counted from the beginning by judging1When the next TRIG signal is not received within the time, every taOutputting a first light-emitting signal in time; so as to prevent the pump light energy from exceeding the threshold value and avoid the damage of the modulator.
Since the validation of the two-stage spatial modulator requires a certain response time, the timing t is started1Within time, controlling the delay t of the first light-emitting signalbTime output so that the secondary spatial modulator t can be reservedbSo that the light extraction is more stable.
Has good effectOptionally, the frequency f of the TRIG signal satisfies: f. of1≤f≤f2；
t1、ta、tbIs a preset value and meets the following requirements:
Figure BDA0003128180310000051
in particular, f1、f2、t1、ta、tbAre set values, and f is used for convenience of explaining the working principle of the application1＝300K、f22M for example;
t1、ta、tbsatisfies the following conditions:
Figure BDA0003128180310000052
in this example, t1Take 4us, taTaking 1 us; t is tbTaking 250ns, and the specific steps are as follows:
s100: receiving a TRIG signal and preprocessing the TRIG signal; timing is started at the arrival time of the rising edge of each TRIG signal, and a second light-emitting signal is output;
s200: when judging that the next TRIG signal is not received within 4us from the beginning of timing, outputting a first light-emitting signal every 1 us;
and when the next TRIG signal is received within 4us of time from the beginning of timing, outputting a first light-emitting signal after 250ns of time.
For example: and if the next TRIG signal does not arrive within 4us of time, outputting a first light-emitting signal every 1us until the next TRIG signal arrives. For convenience of explanation of the technical solution, the following TRIG signal comes at 6.1us as an example: that is, the first outgoing optical signal is outputted at the time 4us, 5us, and 6us, and the determination process is repeated again at the time 6.1us when the timing is started with the next TRIG signal.
Another example is: when the next TRIG signal arrives at the moment of beginning to count 3us, the first outgoing optical signal is output after the time delay of 250ns at the moment, namely the first outgoing optical signal is output at the moment of beginning to count 3.25 us.
Preferably, the method for preprocessing the TRIG signal specifically includes: and carrying out two-stage synchronous processing on the TRIG signal.
Example 2
The present embodiment provides a random trigger control system, as shown in fig. 2, including an FPGA module 100; the FPGA module 100 includes a receiving unit 101, a processing unit 102, an output unit 103, and a clock unit 104;
the receiving unit 101 is configured to receive a TRIG signal;
the output unit 103 is configured to output a first outgoing optical signal and a second outgoing optical signal;
the clock unit 104 is configured to clock and output clock data starting at the arrival time of the rising edge of each of the TRIG signals; the clock data comprises timing starting information and timing time;
the processing unit 102 is configured to: preprocessing the TRIG signal; acquiring clock data; when the timing starting information is acquired, controlling the output unit 103 to output a second light emitting signal; judging that the timing time is more than t1Then, the output unit 103 is controlled to perform the operation every taOutputting a first light-emitting signal in time; judging that the timing time is less than or equal to t1When it is, then at tbAnd controlling the output unit 103 to output the first light-emitting signal after time.
The working principle is as follows: when the FPGA module 100 is used, the system only needs to send a protocol instruction of a random trigger mode to the FPGA module 100 through a bus, wherein the address code is 2C, and the data code is 4. After receiving the instruction, the FPGA module 100 adjusts the state of the "random trigger mode" and starts to control the receiving unit 101 to monitor the external TRIG signal;
the random trigger mode specifically includes:
when the receiving unit 101 acquires an external TRIG signal, the external TRIG signal is sent to the processing unit 101, and the processing unit 101 preprocesses the TRIG signal and acquires corresponding clock data;
when the start timing information is acquired, the processing unit controls the output unit 103 to output the first timing informationSecondly, emitting light signals; judging that the timing time is more than t1Then, the output unit 103 is controlled to perform the operation every taOutputting a first light-emitting signal in time; judging that the timing time is less than or equal to t1When it is, then at tbAnd controlling the output unit 103 to output the first light-emitting signal after time.
Preferably, the frequency f of the TRIG signal satisfies: f. of1≤f≤f2；
t1、ta、tbIs a preset value and meets the following requirements:
Figure BDA0003128180310000071
in particular, f1、f2、t1、ta、tbAre all set values, in f1＝300K、f22M for example:
t1、ta、tbsatisfies the following conditions:
Figure BDA0003128180310000072
in this example, t1Take 4us, taTaking 1 us; t is tbTaking 250 ns; the method specifically comprises the following steps:
the processing unit 102 is configured to: preprocessing the TRIG signal; acquiring clock data; when the timing starting information is acquired, controlling the output unit 103 to output a second light emitting signal; when the timing time is judged to be more than 4us, the output unit 103 is controlled to perform every taOutputting a first light-emitting signal in time; and when the timing time is judged to be less than or equal to 4us, the output unit 103 is controlled to output the first light-emitting signal after 250 ns.
Example 3
The present embodiment provides a laser system, as shown in fig. 3, including a laser module 200 and the random trigger control system as described above;
the laser module 200 comprises a primary fiber modulator 201 and a first driving unit 202; a two-level spatial modulator 203, a second driving unit 204; and a pump source 205;
the first driving unit 202 is configured to receive the first outgoing optical signal and control the primary optical fiber modulator 201 to turn on; the second driving unit 204 is configured to receive the second outgoing optical signal and control the secondary spatial modulator 203 to turn on;
the pumping source 205 is configured to output signal light, and the signal light outputs laser light after passing through the primary optical fiber modulator 201 and the secondary spatial modulator 203.
The working principle is as follows:
when the receiving unit 101 acquires an external TRIG signal, the external TRIG signal is sent to the processing unit 101, and the processing unit 101 preprocesses the TRIG signal and acquires corresponding clock data;
when the timing starting information is acquired, the processing unit controls the output unit 103 to output a second outgoing optical signal and send the second outgoing optical signal to the second driving unit 203, and the second driving unit controls the secondary spatial modulator 203 to be started;
judging that the timing time is more than t1Then, the output unit 103 is controlled to perform the operation every taOutputting a first light-emitting signal in time; judging that the timing time is less than or equal to t1When it is, then at tbAnd controlling the output unit 103 to output the first light-emitting signal after time. And after the first driving unit receives the first light-emitting signal, controlling the primary optical fiber modulator 201 to be started.
When the signal light output by the pump source 205 passes through the primary optical fiber modulator 201 and the secondary spatial modulator 203 in the on state, laser light is output.
Specifically, the primary optical fiber modulator 201 and the secondary spatial modulator 203 are both acousto-optic modulators;
the primary optical fiber modulator 201 is high in precision and high in speed, and the minimum threshold value is 25 ns; for example: a first light-emitting signal with the width of 25ns is emitted every 10us, and light-emitting with the fundamental repetition frequency of 100KHz can be performed; a first outgoing optical signal with the width of 25ns is sent out every 500ns, and outgoing light with the fundamental repetition frequency of 2MHz can be made.
Wherein, the first-stage fiber modulator 201 has a relatively slow speed, and the minimum threshold value is 400-600 ns.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (4)

1. A random trigger control method is characterized in that: the method comprises the following steps:
receiving a TRIG signal and preprocessing the TRIG signal; timing is started at the arrival time of the rising edge of each TRIG signal, and a second light-emitting signal is output;
determining the time t from the beginning1When the next TRIG signal is not received within the time, every taOutputting a first light-emitting signal in time;
determining the time t from the beginning1When the next TRIG signal is received in time, the time is delayed by tbOutputting a first light-emitting signal in time;
the frequency f of the TRIG signal satisfies: f. of1≤f≤f2；
t1、ta、tbIs a preset value and meets the following requirements:
Figure FDA0003364249000000011
2. the random trigger control method of claim 1, wherein: the method for preprocessing the TRIG signal specifically comprises the following steps: and carrying out two-stage synchronous processing on the TRIG signal.
3. A random trigger control system, characterized by: comprises an FPGA module (100); the FPGA module (100) comprises a receiving unit (101), a processing unit (102), an output unit (103) and a clock unit (104);
the receiving unit (101) is configured to receive a TRIG signal;
the output unit (103) is configured to output a first outgoing optical signal and a second outgoing optical signal;
the clock unit (104) is configured to clock and output clock data starting at the arrival time of the rising edge of each TRIG signal; the clock data comprises timing starting information and timing time;
the processing unit (102) is configured to: preprocessing the TRIG signal; acquiring clock data; when the timing starting information is acquired, controlling the output unit (103) to output a second light emitting signal; judging that the timing time is more than t1When the time is longer, the output unit (103) is controlled to perform control every taOutputting a first light-emitting signal in time; judging that the timing time is less than or equal to t1When it is, then at tbControlling the output unit (103) to output a first light-emitting signal after time;
the frequency f of the TRIG signal satisfies: f. of1≤f≤f2；
t1、ta、tbIs a preset value and meets the following requirements:
Figure FDA0003364249000000012
4. a laser system, characterized by: comprising a laser module (200) and a random trigger control system of one of the claims 3;
the laser module (200) comprises a primary optical fiber modulator (201) and a first driving unit (202); a two-stage spatial modulator (203), a second drive unit (204); and a pump source (205);
the first driving unit (202) is used for receiving the first outgoing optical signal and controlling the primary optical fiber modulator (201) to be started; the second driving unit (204) is configured to receive the second outgoing optical signal and control the secondary spatial modulator (203) to turn on;
the pumping source (205) is used for outputting signal light, and the signal light outputs laser after passing through the primary optical fiber modulator (201) and the secondary spatial modulator (203).
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