CN115102020A - Pulse laser output control device and control method - Google Patents

Pulse laser output control device and control method Download PDF

Info

Publication number
CN115102020A
CN115102020A CN202210831827.1A CN202210831827A CN115102020A CN 115102020 A CN115102020 A CN 115102020A CN 202210831827 A CN202210831827 A CN 202210831827A CN 115102020 A CN115102020 A CN 115102020A
Authority
CN
China
Prior art keywords
unit
pulse
signal
output
seed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210831827.1A
Other languages
Chinese (zh)
Inventor
邱杭锴
孙龙
申玉
郭宏伟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hangzhou Aochuang Photonics Technology Co ltd
Original Assignee
Hangzhou Aochuang Photonics Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hangzhou Aochuang Photonics Technology Co ltd filed Critical Hangzhou Aochuang Photonics Technology Co ltd
Priority to CN202210831827.1A priority Critical patent/CN115102020A/en
Publication of CN115102020A publication Critical patent/CN115102020A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
    • H01S3/10015—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by monitoring or controlling, e.g. attenuating, the input signal
    • 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
    • H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
    • H01S3/1001—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by controlling the optical 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
    • H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)

Abstract

The embodiment of the invention discloses a pulse laser output control device and a control method. The control device comprises a pulse laser generation module and a control module; the pulse laser generation module comprises a seed source, a frequency modulation unit and an amplification unit, wherein the amplification unit comprises a pumping source and a gain medium; the control module comprises a trigger unit and a control unit, the trigger unit is connected with the control unit, and the frequency modulation unit and the pumping source are both connected with the control unit; the control unit is used for controlling the pumping source and the frequency modulation unit to be switched on and off under the trigger signal output by the trigger unit so as to enable the pulse laser generation module to output pulse laser according to a preset sequence. According to the technical scheme of the embodiment of the invention, the pumping source and the frequency modulation unit can be controlled to be opened and closed according to the trigger signal, pulse output in different modes is realized, an external spatial frequency modulation unit is omitted, the structure of the laser is simplified, the cost of the laser is reduced, and the service life of the laser is prolonged.

Description

Pulse laser output control device and control method
Technical Field
The invention relates to the technical field of optics, in particular to a pulse laser output control device and a control method.
Background
The femtosecond laser has wide application in the fields of material fine micromachining, semiconductor industry, solar photovoltaic, scientific research and the like due to extremely high peak power and narrow pulse width. The peak power of the femtosecond pulse is very high, and direct amplification easily causes damage to amplifier devices, so that the femtosecond laser usually adopts a pulse chirped amplification technology (CPA), that is, a pulse of the seed light is stretched to the order of hundreds of picoseconds or even nanoseconds by using a stretcher, and then the pulse is input into an amplifier for pulse amplification. The pulse output by the amplifier is compressed to a femtosecond output level by the pulse compression device.
The pulse repetition frequency from the femtosecond seed oscillation cavity is usually in the order of tens of MHz, while the pulse repetition frequency for industrial processing application is usually in the order of hundreds of kHz, so an acousto-optic modulator (AOM) is usually used for frequency reduction and then main amplification in the process of pulse chirp amplification, and a space AOM is usually used for output control at an output end. So in general a laser will typically have two AOMs, the first for reducing the seed source frequency to a fixed output frequency and the second for controlling the output of power and control of pulses.
When the laser carries out complex pattern processing, the switching of the straight line part and the curved line part in the pattern inevitably causes the change of the speed, if a fixed pulse repetition frequency is used, the laser stays too long in the curved line part, the heat affected zone is enlarged, and the processing effect is directly influenced. However, directly changing the output frequency of the laser not only causes the fluctuation of the laser power caused by the change of the output frequency of the laser, but also has a slow switching speed, which also affects the processing effect.
Currently, there are many control modes for industrial processing using femtosecond lasers. There are typically a normally light-out mode, a Gate (Gate) mode, and a position-synchronized output (PSO) mode. The normal light emitting mode is to make the laser emit light all the time for processing, and pulses are output at equal intervals. In a Gate mode, when an external trigger signal is at a high level, the output-controlled spatial AOM synchronously outputs pulse light with a fixed repetition frequency set by the down-conversion AOM, the pulse interval is fixed, and when the external trigger signal is at a low level, the output-controlled spatial AOM is turned off and stops outputting the pulse signal. In the PSO mode, the output-controlled spatial AOM outputs a pulse each time the external trigger signal is at a high level, and the output frequency of the pulse is determined by the frequency of the external trigger signal.
In order to realize the Gate mode and the PSO mode, a spatial AOM is usually added at the output of the laser to control the output power and select a single pulse. The spatial AOM has certain loss, the actual light output power of the laser is higher, and the rated output power can be achieved only after the laser passes through the AOM. And usually, the laser is in full power and normally emits light to operate, which causes energy loss, and for devices in the laser, the service life is also reduced.
Disclosure of Invention
The embodiment of the invention provides a pulse laser output control device and a control method, wherein the control device can control a pumping source and a frequency modulation unit to be switched on and off according to a trigger signal, so that pulse output in different modes is realized, an external spatial frequency modulation unit is omitted, the structure of a laser is simplified, the cost of the laser is reduced, and the service life of the laser is prolonged.
According to an aspect of the present invention, there is provided a pulsed laser output control apparatus including a pulsed laser generation module and a control module;
the pulse laser generation module comprises a seed source, a frequency modulation unit and an amplification unit, wherein the amplification unit comprises a pumping source and a gain medium;
the control module comprises a trigger unit and a control unit, the trigger unit is connected with the control unit, and the frequency modulation unit and the pumping source are both connected with the control unit;
the control unit is used for controlling the pumping source and the frequency modulation unit to be switched on and off under the trigger signal output by the trigger unit, so that the pulse laser generation module outputs pulse laser according to a preset sequence.
Optionally, the control unit is further connected to the seed source, and the control unit is further configured to obtain a seed clock signal of the seed pulse laser emitted by the seed source;
the trigger signal output by the trigger unit comprises a gating signal and a position synchronization output signal;
when the trigger signal is the gate control signal, the control unit controls the pumping source to be started for a first preset time according to the gate control signal and the seed clock signal, drives the frequency modulation unit to carry out frequency reduction on the repetition frequency of the seed pulse laser according to the repetition frequency setting, and controls the pumping source to be stopped after at least 1 pulse is output; controlling the pumping source and the frequency modulation unit to be repeatedly opened and closed according to the preset repetition frequency within the duration time of a first level signal of the gating signal, and controlling the pumping source and the frequency modulation unit to be repeatedly opened and closed simultaneously when the gating signal is a second level signal;
when the trigger signal is the position synchronization output signal, the control unit controls the pumping source to be started after the pumping source is controlled to be started for a second preset time according to the position synchronization output signal and the seed clock signal when the position synchronization output signal is triggered once, and synchronously controls the pumping source and the frequency modulation unit to be stopped after at least 1 pulse is output.
Optionally, the trigger signal output by the trigger unit further includes a normal light emitting signal, and when the trigger signal is the normal light emitting signal, the control unit controls the pumping source to be normally open, and generates a modulation pulse signal to drive the frequency modulation unit according to the seed clock signal and the repetition frequency setting, so that the pulse laser generation module outputs pulse laser with a preset repetition frequency.
Optionally, the first preset time is greater than or equal to 1 μ s and less than or equal to 1ms, and the second preset time is greater than or equal to 1 μ s and less than or equal to 1 ms.
Optionally, the pulse laser generating module further includes a pulse stretching unit and a pulse compressing unit, and the amplifying unit includes a pre-amplifying unit and a main amplifying unit;
the seed source, the pulse stretching unit, the pre-amplifying unit, the frequency modulation unit, the main amplifying unit and the pulse compression unit are sequentially arranged along a light path;
and the pumping source of the main amplification unit is connected with the control unit.
Optionally, the seed source includes a femtosecond fiber pulse laser with an output repetition frequency of 20MHz to 80 MHz.
Optionally, the pulse stretching unit includes a circulator and a chirped grating, a first end of the circulator is connected to the output end of the seed source, a second end of the circulator is connected to the chirped grating, and a third end of the circulator is connected to the pre-amplifying unit.
Optionally, the pre-amplification unit and the main amplification unit both include fiber amplifiers.
Optionally, the pulse compression unit comprises a transmission grating-based pulse compressor, a reflection grating-based pulse compressor or a volume grating-based pulse compressor.
According to another aspect of the present invention, there is provided a pulse laser output control method performed with the pulse laser output apparatus described above, the pulse laser output control method including:
the seed source outputs seed pulse laser;
the control unit controls the pumping source and the frequency modulation unit to be switched on and off according to the trigger signal so that the pulse laser generation module outputs pulse laser according to a preset sequence.
The pulse laser output control device provided by the embodiment of the invention comprises a pulse laser generating module and a control module; the pulse laser generation module comprises a seed source, a frequency modulation unit and an amplification unit, wherein the amplification unit comprises a pumping source and a gain medium; the control module comprises a trigger unit and a control unit. Seed pulse laser is generated through a seed source, and the seed pulse laser is amplified through an amplifying unit; the control unit controls the pumping source and the frequency modulation unit to be switched on and off under the trigger signal output by the trigger unit, so that the pulse laser generation module outputs pulse laser according to a preset sequence. The control device can save a space laser frequency modulation unit (such as a space AOM), and realize pulse laser output by controlling the on and off of the pumping source and the frequency modulation unit, thereby reducing the cost of the laser, saving the loss caused by the space laser frequency modulation unit and realizing higher power output. And the laser does not need to run at full power and normal light emission, so that the service lives of the laser and internal devices are prolonged.
It should be understood that the statements in this section are not intended to identify key or critical features of the embodiments of the present invention, nor are they intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a pulse laser in the prior art;
FIG. 2 is a timing diagram of a pulse laser in the prior art;
fig. 3 is a schematic structural diagram of a pulse laser output control apparatus according to an embodiment of the present invention;
fig. 4 is a timing diagram corresponding to a Gate mode according to an embodiment of the present invention;
fig. 5 is a timing diagram corresponding to a PSO mode according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of another pulsed laser output control apparatus according to an embodiment of the present invention;
fig. 7 is a flowchart illustrating a method for controlling a pulsed laser output according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of a pulse laser in the prior art, and fig. 2 is a schematic timing diagram of a pulse laser in the prior art. Referring to fig. 1 and 2, the pulsed laser includes a seed source 1, an AOM2, an amplifier 3, a spatial AOM4, and a controller 5, wherein the seed source 1 outputs femtosecond seed pulsed laser with high repetition rate (shown by curve a in fig. 2), and the controller 5 is configured to control the AOM2 to reduce the repetition rate of the pulsed laser according to a predetermined setting, and is further configured to control the spatial AOM4 to operate according to an external trigger signal, so as to implement different operation modes. Since the repetition frequency of the seed source 1 is high and can not be directly used for industrial processing, the AOM2 is set for modulation, so that the repetition frequency is reduced. In order to meet the requirements of laser processing of different application scenarios, the control modes of a laser generally include a Gate mode and a PSO mode, where curves b to d in fig. 2 show timing diagrams corresponding to the Gate mode, where a curve b is a waveform diagram of an external trigger signal in the Gate mode, a curve c is a waveform diagram of a modulation signal of the spatial AOM4 in the Gate mode, and a curve d is a laser pulse output in the Gate mode. Curves e to f in fig. 2 show timing diagrams corresponding to the PSO mode, and the Gate mode and the PSO mode shown in fig. 2 use the same external trigger signal, where curve e is a waveform diagram of the modulation signal of the spatial AOM4 in the PSO mode, and curve f is a laser pulse output in the PSO mode. The existing laser structure needs to be additionally provided with a space AOM to cause loss and cause energy consumption, and for a laser with a normal hundred KHz repetition frequency, the delay Jitter (Jitter) between a pulse and a synchronous signal in a PSO mode is in a mu s level.
In order to solve the above problem, an embodiment of the present invention provides a pulse laser output control apparatus. Fig. 3 is a schematic structural diagram of a pulse laser output control apparatus according to an embodiment of the present invention. Referring to fig. 3, the pulsed laser output control apparatus includes a pulsed laser generation module 10 and a control module 20; the pulse laser generation module 10 comprises a seed source 11, a frequency modulation unit 12 and an amplification unit 13, wherein the amplification unit 13 comprises a pumping source 131 and a gain medium 132; the control module 20 comprises a trigger unit 21 and a control unit 22, the trigger unit 21 is connected with the control unit 22, and the frequency modulation unit 12 and the pumping source 131 are both connected with the control unit 22; the control unit 22 is configured to control the pumping source 131 and the frequency modulation unit 12 to be turned on and off according to the trigger signal output by the trigger unit 21, so that the pulse laser generation module 10 outputs the pulse laser according to a preset sequence.
For example, in a certain embodiment, optionally, the seed source 11 includes a femtosecond fiber pulse laser that outputs a repetition frequency of 20MHz to 80MHz, and when the seed source 11 is implemented specifically, the type and parameters of the seed source 11 may be selected according to actual conditions. The frequency modulation unit 12 is configured to modulate a repetition frequency of the pulse laser, specifically, to reduce the repetition frequency of the pulse laser, the frequency modulation unit 12 may specifically select an AOM, an electro-optical modulation unit EOM, and the like, which is not limited in the embodiment of the present invention. The amplifying unit 13 is configured to amplify the power of the seed pulse beam, and in particular, the seed pulse beam may be amplified in a single stage or multiple stages. The pump source 131 may be a pump laser, such as a laser diode LD. The gain medium 132 may be a laser crystal, an active fiber, or the like. The trigger unit 21 is configured to output a trigger signal, such as a Gate mode trigger signal or a PSO mode trigger signal. The control unit 21 controls the pumping source 131 and the frequency modulation unit 12, and when laser output is not needed, the pumping source 131 is controlled to be turned off, so that amplified pulse laser output is not generated, that is, the pulse laser output is controlled in a discontinuous pumping manner.
According to the technical scheme of the embodiment of the invention, the seed pulse laser is generated by a seed source and amplified by an amplifying unit; the control unit controls the pumping source and the frequency modulation unit to be switched on and off under the trigger signal output by the trigger unit, so that the pulse laser generation module outputs pulse laser according to a preset sequence. The control device can save a space laser frequency modulation unit (such as a space AOM), and realize pulse laser output by controlling the on and off of the pumping source and the frequency modulation unit, thereby reducing the cost of the laser, simultaneously saving the loss caused by the space laser frequency modulation unit and realizing higher power output. And the laser does not need to run at full power and normal light emission, so that the service lives of the laser and internal devices are prolonged.
On the basis of the above embodiment, optionally, with reference to fig. 3, the control unit 22 is further connected to the seed source 11, and the control unit 22 is further configured to obtain a seed clock signal of the seed pulse laser emitted by the seed source 11. In specific implementation, a light splitting structure and a photodetector may be disposed at the output end of the seed source 11, a small portion of the light beam is received by the photodetector to form a seed clock signal, and the seed clock signal is transmitted to the control unit 22, and a large portion of the light beam is continuously transmitted along the light path to complete subsequent amplification.
The trigger signal output by the trigger unit 21 includes a Gate control signal and a position synchronization output signal, where the Gate control signal is a Gate mode trigger signal, and the position synchronization output signal is a PSO mode trigger signal.
When the trigger signal is a gate control signal, the control unit controls the pumping source to start for a first preset time according to the gate control signal and the seed clock signal, sets a driving frequency modulation unit according to a repetition frequency to reduce the frequency of the repetition frequency of the seed pulse laser according to the preset repetition frequency, and controls the pumping source to close after at least 1 pulse is output; and controlling the pumping source and the frequency modulation unit to be repeatedly opened and closed according to a preset repetition frequency within the duration of the first level signal of the gating signal, and controlling the pumping source and the frequency modulation unit to be repeatedly opened and closed when the gating signal is the second level signal.
The first level signal may be a high level signal, the second level signal may be a low level signal, and the first preset time may be greater than or equal to 1 μ s and less than or equal to 1ms, which may be set according to actual situations in specific implementation.
Taking the AOM as an example of a frequency modulation unit outputting 1 pulse every time, exemplarily, fig. 4 is a timing diagram corresponding to a Gate mode according to an embodiment of the present invention. Referring to fig. 4, in fig. 4, a curve g is a trigger signal (Gate signal), a curve h is a switching signal of a pump source, a curve i is a switching signal of an AOM, a dotted line is an equivalent trigger signal, and a curve j is a seed pulse beam sequence, wherein pulses in a dotted line frame correspond to pulse laser output by the pulse laser output control device. In the Gate control mode, when the Gate signal is input to the control unit 22, the timing circuit of the control unit 22 synchronizes the Gate signal and the seed clock signal, the pumping source 131 of the amplifying unit 13 is turned on first, and the pumping current is set according to the current-power corresponding value fitted in advance; after a fixed pumping time (a first preset time, usually in the order of μ s to hundred μ s), driving the AOM to perform frequency reduction according to the set frequency according to the seed clock signal and the repetition frequency setting, and turning off the pumping source 131 of the amplifying unit 13 after each 1 pulse is emitted; the pumping source 131 and the AOM are repeatedly turned on and off according to the set repetition frequency during the duration of the high level signal of the Gate signal. When the Gate signal is off (low level), the AOM and the pump source 131 are turned off at the same time, and the power is turned off.
When the trigger signal is a position synchronization output signal, the control unit controls the pumping source to be started after the pumping source is controlled to be started for a second preset time according to the position synchronization output signal and the seed clock signal when the position synchronization output signal is triggered once, and synchronously controls the pumping source and the frequency modulation unit to be stopped after at least 1 pulse is output. Wherein the second preset time is greater than or equal to 1 mus and less than or equal to 1 ms.
Exemplarily, fig. 5 is a timing diagram corresponding to a PSO mode according to an embodiment of the present invention. Referring to fig. 5, in fig. 5, a curve k is a trigger signal (PSO signal), a curve l is a switching signal of a pump source, a curve m is a switching signal curve of an AOM, and n is a seed pulse beam sequence, where pulses in a dashed line frame correspond to pulse laser output by a pulse laser output control device. In the PSO control mode, when the PSO signal is input to the control unit 22, the timing circuit of the control unit 22 synchronizes the PSO signal and the seed clock signal, and according to the seed clock signal, the pumping source 131 of the amplifying unit 13 is first turned on every PSO signal, and the pumping current is set according to the current-power corresponding value fitted in advance; after a fixed pumping time (second preset time, typically on the order of μ s to hundred μ s), the AOM is turned on, 1 pulse is discharged, and then the pump source 131 and the AOM are turned off synchronously. Therefore, the energy of each pulse is kept consistent according to the trigger signal, and the AOM releases the pulse according to the trigger signal, so that the PSO working mode is realized. If continuous pumping is adopted, pulses output at different intervals are caused, the number of particles of the upper energy level accumulated by pumping is different, and the amplified amplitude of the pulses is different. If the pulse interval is too long, spontaneous transition of the upper level population to form spontaneous radiation and then amplification can be caused, and damage to the amplifier can be caused. The use of pulsed pumping thus avoids both of these situations.
In another embodiment, optionally, the trigger signal output by the trigger unit further includes a normally-emitting light signal, and when the trigger signal is the normally-emitting light signal, the control unit controls the pumping source to be normally-open, and generates a modulated pulse signal according to the seed clock signal and the repetition frequency setting to drive the frequency modulation unit, so that the pulse laser generation module outputs the pulse laser with the preset repetition frequency.
When the trigger signal is in a normal light emitting mode, the control unit controls the pump source to be continuously turned on, and then continuously outputs the pulse laser according to the repetition frequency setting.
In another embodiment, in order to increase the output power of the pulsed laser, a stepwise amplification may be used. Fig. 6 is a schematic structural diagram of another pulsed laser output control apparatus according to an embodiment of the present invention. Referring to fig. 6, optionally, the pulse laser generating module 10 further includes a pulse stretching unit 14 and a pulse compressing unit 15, and the amplifying unit 13 includes a pre-amplifying unit 13a and a main amplifying unit 13 b; the seed source 11, the pulse stretching unit 14, the pre-amplifying unit 13a, the frequency modulation unit 12, the main amplifying unit 13b and the pulse compression unit 15 are sequentially arranged along an optical path; main amplification unit 13b includes pump source 131b and gain medium 132b pump source 131b of main amplification unit 13b is connected to control unit 22.
The laser pulse output by this embodiment is a femtosecond pulse, and in order to avoid directly amplifying and damaging the device, the laser pulse is amplified by a stretching-amplifying-compressing method. The specific optical path and device may be designed according to actual situations, and the embodiment of the present invention does not limit this.
The pulse stretching unit 14 is configured to stretch the femtosecond-level seed pulse laser to several hundred picoseconds or even nanosecond level to reduce peak power, and after the seed pulse laser is gradually amplified by the pre-amplification unit 13a and the main amplification unit 13b, the seed pulse laser is compressed to the femtosecond level by the pulse compression unit 15 to realize femtosecond pulse output. In a specific implementation, the pre-amplification unit 13a and the main amplification unit 13b both include fiber amplifiers, and the pulse compression unit 15 includes a transmission grating-based pulse compressor, a reflection grating-based pulse compressor, or a volume grating-based pulse compressor, which is not limited in the present invention.
With continued reference to fig. 6, optionally, the pulse stretching unit 14 includes a circulator 141 and a chirped grating 142, a first end of the circulator 141 is connected to the output end of the seed source 11, a second end of the circulator 141 is connected to the chirped grating 142, and a third end of the circulator 142 is connected to the pre-amplifying unit 13 a.
The circulator is a multi-port optical device with nonreciprocal characteristics. When an optical signal is input from one port, the optical signal is output from the next port in the order of ports with little loss, and the loss of the port to all other ports is large, so that the port is not connected. The principle of pulse broadening is as follows: after the pulse enters the chirp grating for diffraction, light with different frequencies in the pulse is dispersed due to different diffraction angles, and the arrangement of the diffraction element enables the optical path of the blue light part of the pulse to be longer than that of the red light part, so that the red light leaves the chirp grating before the blue light, and pulse broadening is realized.
Fig. 7 is a schematic flowchart of a pulse laser output control method according to an embodiment of the present invention, where the pulse laser output control method is executed by using any one of the pulse laser output devices according to the embodiments, and referring to fig. 7, the pulse laser output control method includes:
and step S110, outputting the seed pulse laser by the seed source.
Wherein, the seed source can be a fiber laser, and the output seed pulse laser can be a femtosecond pulse with the repetition frequency of 20 MHz-80 MHz.
And step S120, the trigger unit outputs a trigger signal, and the control unit controls the pumping source and the frequency modulation unit to be switched on and off according to the trigger signal, so that the pulse laser generation module outputs pulse laser according to a preset sequence.
The pumping source and the frequency modulation unit are controlled to be switched on and off, and the pulse laser generation module can be controlled to enter a Gate mode or a PSO mode according to requirements.
According to the technical scheme of the embodiment of the invention, the seed pulse laser is generated by a seed source and amplified by an amplifying unit; the control unit controls the pumping source and the frequency modulation unit to be switched on and off under the trigger signal output by the trigger unit, so that the pulse laser generation module outputs pulse laser according to a preset sequence. And pulse laser output is realized by controlling the on and off of the pumping source and the frequency modulation unit, so that the cost of the laser is reduced, loss caused by the spatial laser frequency modulation unit is saved, and higher power output can be realized. And the laser does not need to run at full power and normal light emission, so that the service lives of the laser and internal devices are prolonged.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A pulse laser output control device is characterized by comprising a pulse laser generation module and a control module;
the pulse laser generation module comprises a seed source, a frequency modulation unit and an amplification unit, wherein the amplification unit comprises a pumping source and a gain medium;
the control module comprises a trigger unit and a control unit, the trigger unit is connected with the control unit, and the frequency modulation unit and the pumping source are both connected with the control unit;
the control unit is used for controlling the pumping source and the frequency modulation unit to be switched on and off under the trigger signal output by the trigger unit, so that the pulse laser generation module outputs pulse laser according to a preset sequence.
2. The pulsed laser output control device according to claim 1, wherein the control unit is further connected to the seed source, and the control unit is further configured to obtain a seed clock signal of the seed pulsed laser emitted from the seed source;
the trigger signal output by the trigger unit comprises a gating signal and a position synchronization output signal;
when the trigger signal is the gate control signal, the control unit controls the pumping source to be started for a first preset time according to the gate control signal and the seed clock signal, drives the frequency modulation unit to carry out frequency reduction on the repetition frequency of the seed pulse laser according to the repetition frequency setting, and controls the pumping source to be closed after at least 1 pulse is output; controlling the pumping source and the frequency modulation unit to be repeatedly opened and closed according to the preset repetition frequency within the duration time of a first level signal of the gating signal, and controlling the pumping source and the frequency modulation unit to be repeatedly opened and closed simultaneously when the gating signal is a second level signal;
when the trigger signal is the position synchronization output signal, the control unit controls the pumping source to be started after the pumping source is controlled to be started for a second preset time according to the position synchronization output signal and the seed clock signal when the position synchronization output signal is triggered once, and synchronously controls the pumping source and the frequency modulation unit to be stopped after at least 1 pulse is output.
3. The output control device of claim 2, wherein the trigger signal output by the trigger unit further includes a normally-emitting light signal, and when the trigger signal is the normally-emitting light signal, the control unit controls the pumping source to be normally-on, and generates a modulated pulse signal to drive the frequency modulation unit according to the seed clock signal and the repetition frequency setting, so that the pulse laser generation module outputs pulse laser with a preset repetition frequency.
4. The pulsed laser output control device according to claim 2, wherein the first preset time is greater than or equal to 1 μ s and less than or equal to 1ms, and the second preset time is greater than or equal to 1 μ s and less than or equal to 1 ms.
5. The pulsed laser output control device according to claim 1, wherein the pulsed laser generation module further comprises a pulse stretching unit and a pulse compression unit, and the amplification unit comprises a pre-amplification unit and a main amplification unit;
the seed source, the pulse stretching unit, the pre-amplifying unit, the frequency modulation unit, the main amplifying unit and the pulse compression unit are sequentially arranged along a light path;
and the pumping source of the main amplification unit is connected with the control unit.
6. The pulsed laser output control device of claim 5, wherein the seed source comprises a femtosecond fiber pulsed laser outputting a repetition frequency of 20MHz to 80 MHz.
7. The pulsed laser output control device according to claim 5, wherein the pulse stretching unit includes a circulator and a chirped grating, a first end of the circulator is connected to the output end of the seed source, a second end of the circulator is connected to the chirped grating, and a third end of the circulator is connected to the pre-amplifying unit.
8. The pulsed laser output control device according to claim 5, wherein the pre-amplification unit and the main amplification unit each include a fiber amplifier.
9. The pulsed laser output control device according to claim 5, wherein the pulse compression unit comprises a transmission grating-based pulse compressor, a reflection grating-based pulse compressor, or a bulk grating-based pulse compressor.
10. A pulsed laser output control method, which is performed by using the pulsed laser output apparatus according to any one of claims 1 to 9, the pulsed laser output control method comprising:
the seed source outputs seed pulse laser;
the control unit controls the pumping source and the frequency modulation unit to be switched on and off according to the trigger signal so that the pulse laser generation module outputs pulse laser according to a preset sequence.
CN202210831827.1A 2022-07-14 2022-07-14 Pulse laser output control device and control method Pending CN115102020A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210831827.1A CN115102020A (en) 2022-07-14 2022-07-14 Pulse laser output control device and control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210831827.1A CN115102020A (en) 2022-07-14 2022-07-14 Pulse laser output control device and control method

Publications (1)

Publication Number Publication Date
CN115102020A true CN115102020A (en) 2022-09-23

Family

ID=83297953

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210831827.1A Pending CN115102020A (en) 2022-07-14 2022-07-14 Pulse laser output control device and control method

Country Status (1)

Country Link
CN (1) CN115102020A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN116544766A (en) * 2023-05-26 2023-08-04 珠海光恒科技有限公司 Control circuit and method of pump laser and erbium-doped fiber amplifier
CN117389200A (en) * 2023-12-08 2024-01-12 迈为技术(珠海)有限公司 Laser control system, method and computer equipment based on acousto-optic deflector

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN116544766A (en) * 2023-05-26 2023-08-04 珠海光恒科技有限公司 Control circuit and method of pump laser and erbium-doped fiber amplifier
CN116544766B (en) * 2023-05-26 2024-02-13 珠海光恒科技有限公司 Control circuit and method of pump laser and erbium-doped fiber amplifier
CN117389200A (en) * 2023-12-08 2024-01-12 迈为技术(珠海)有限公司 Laser control system, method and computer equipment based on acousto-optic deflector

Similar Documents

Publication Publication Date Title
CN115102020A (en) Pulse laser output control device and control method
US9461436B2 (en) Pulse laser device and burst mode using same, and method for controlling a variable burst mode
CA2727985C (en) Digital laser pulse shaping module and system
US11108207B2 (en) Pulse laser system that is temporally variable in terms of rhythm and/or amplitude
CA2842192C (en) System and method for emitting optical pulses in view of a variable external trigger signal
KR20090058547A (en) Method and system for a pulsed laser source emitting shaped optical waveforms
EP3131163B1 (en) Laser light-source apparatus and laser pulse light generating method
EP3107159A2 (en) Laser light-source apparatus and laser pulse light generating method
CN110165539B (en) Method for realizing adjustable sub-pulse group interval output by multi-step pumping and laser
JPH055912A (en) Multistage optical amplifying device
CN105846288A (en) Control method for first pulse suppression of laser
WO2019075983A1 (en) Fast on/off pulse laser
CN215681231U (en) Pulse width adjustable optical fiber laser
CN103762495A (en) Method for increasing laser thermal response speed and multi-terminal pump solid state laser
CN104242037A (en) Method and device for obtaining pulse string laser through itracavity modulation
JP6329721B2 (en) Laser apparatus and optical amplification method
CN106848826B (en) A kind of double electro-optical Q-switch regenerative amplification devices
CN203150894U (en) Pulse pump type annular resonant cavity nanosecond pulse laser device
WO2018203483A1 (en) Laser light source device and laser pulse light generating method
JP2022118758A (en) Laser light source device and control method of laser light source device
KR101262346B1 (en) Method of flexible burst mode operation of pulse laser system with multiple seed　and laser system with flexible burst mode operation
CN218472525U (en) Raman fiber laser with continuously adjustable pulse width range
CN203056359U (en) Nanosecond optical fiber laser device with high pulse contrast
CN116826493A (en) Single-frequency optical fiber laser and coherent laser radar detection system using same
CN115459043A (en) Laser pulse width compression device and regulation and control method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination