CN211351243U - High-power MOPA beam combination pulse laser, sequence division unit and time sequence unit - Google Patents

Abstract

The application provides a high power MOPA closes a beam pulse laser, divides preface unit and time sequence unit, and the laser includes: a plurality of laser units for outputting laser light; the time sequence unit is connected with the laser units and is used for controlling the pulse time sequence of the laser output by the laser units; and the beam combining unit is connected with the output ends of the laser units and is used for combining and outputting the received laser beams. The high-power MOPA beam combination pulse laser controls the pulse time sequence of laser output by the laser units through the time sequence unit, the beam combination unit combines the laser output by the laser units, the power superposition of the laser output by the laser units can be realized, and therefore high-power pulse fiber laser is obtained.

Description

High-power MOPA beam combination pulse laser, sequence division unit and time sequence unit

Technical Field

The application relates to the field of optical instrument manufacturing, in particular to a high-power MOPA beam combination pulse laser, a sequence dividing unit and a time sequence unit.

Background

The pulse fiber laser has the advantages of high peak power, high beam quality, high conversion efficiency, high stability, excellent heat dissipation, compact and flexible structure and the like, and can further improve the laser output characteristic. In industrial manufacturing, even in the military field, the pulse optical fiber laser has shown strong application potential, and especially has been widely used in application scenes such as laser marking, welding, cleaning, etc., and along with the application depth, the parameter requirement on the high-power pulse optical fiber laser is higher and higher.

However, parameters such as average power, pulse energy, pulse width and the like of the existing pulse optical fiber laser are limited by high-power devices of a single-cavity laser and process problems such as conversion efficiency, heat dissipation, stability and the like, and the high-performance high-power pulse optical fiber laser is difficult to produce and put into use to meet the requirements of high-speed development of industrial application.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application aims to provide a high-power MOPA beam combination pulse laser, a sequence dividing unit and a time sequence unit, so that a high-performance high-power pulse fiber laser is obtained.

In order to achieve the above object, embodiments of the present application are implemented as follows:

in a first aspect, an embodiment of the present application provides a high-power MOPA beam-combining pulse laser, including: a plurality of laser units for outputting laser light; the time sequence unit is connected with the laser units and is used for controlling the pulse time sequence of the laser output by the laser units; and the beam combining unit is connected with the output ends of the laser units and is used for combining and outputting the received laser beams.

In the embodiment of the application, the high-power MOPA beam-combining pulse laser controls the pulse time sequence of the laser output by the laser units through the time sequence unit, the beam-combining unit combines the laser output by the laser units, and the power superposition of the laser output by the laser units can be realized, so that the high-power pulse fiber laser is obtained, the energy of the laser pulse output by the high-power MOPA beam-combining pulse laser is higher, the adjustable range of the pulse width is larger, and the parameter performance is better.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the timing unit includes a main control unit and a plurality of sequencing units, and the main control unit is connected to each of the sequencing units, and configured to issue an instruction to each of the sequencing units; and each sequencing unit is correspondingly connected with each laser unit and used for controlling the pulse time sequence of the laser output by the laser unit according to the instruction.

In the implementation mode, each laser unit of the high-power MOPA beam combination pulse laser is correspondingly connected with one sequencing unit, the sequencing units are connected with the main control unit, the main control unit can issue instructions, and each sequencing unit determines the pulse time sequence of the laser output by the corresponding laser unit according to the instructions, so that the time sequence of each laser unit can be adjusted conveniently, and the pulse fiber laser with required power can be acquired conveniently.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the laser unit includes a laser source, and the laser source is connected to the corresponding sorting unit and is configured to output laser light under control of the sorting unit.

In the implementation mode, the laser source of the high-power MOPA beam combination pulse laser is connected with the corresponding sequencing unit, and the laser can be output under the control of the sequencing unit, so that the output time sequence of the laser sources is controllable, and the pulse fiber laser with required power can be conveniently obtained.

With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the laser unit further includes an amplifier, and the amplifier is configured to amplify and output a power of the laser light output by the laser light source.

In the implementation mode, the power of the laser output by the laser source is amplified and then output by the amplifier, so that the power of the pulse fiber laser output by the laser unit is convenient to increase, and the upper limit of the power of the high-power MOPA beam combination pulse laser is increased.

With reference to the second possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the laser unit further includes an online isolator, where the online isolator is configured to isolate laser light reflected by the laser light output by the laser unit.

In the implementation mode, the high-power MOPA beam-combining pulse laser is provided with the online isolator, so that the isolation degree of the laser source can be kept, the laser source and the amplifier are prevented from being irreversibly damaged due to the fact that the laser source and the amplifier are caused by returning into the light source, and the laser source and the amplifier can be coupled into the optical fiber again, so that the laser unit outputs laser.

In a second aspect, an embodiment of the present application provides a pulsed fiber laser beam combining method, which is applied to a sequencing unit in a high-power MOPA beam-combining pulsed laser according to any one of the first to fourth possible implementation manners of the first aspect, where the method includes: receiving a control instruction sent by the main control unit; determining a laser output instruction of a laser unit corresponding to the sequencing unit according to the control instruction; and sending the laser output instruction to the corresponding laser unit so as to control the corresponding laser unit to output laser.

In the embodiment of the application, the control instruction sent by the main control unit is received to determine the laser output instruction of the corresponding laser unit, so that the laser unit is controlled to output laser, the pulse time sequence of the laser unit can be adjusted, and the pulse fiber laser with the required peak power and/or pulse width can be acquired.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the determining, according to the control instruction, a laser output instruction of a laser unit corresponding to the sorting unit includes: determining the time delay of the laser unit corresponding to the sequencing unit according to the reference pulse time sequence; and determining the laser output instruction according to the control instruction and the time delay.

In this implementation manner, the delay of the corresponding laser unit is determined according to the reference pulse timing sequence, and the laser output instruction is further determined, so that the pulse timing sequence of the laser unit outputting laser can be more accurately controlled.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the determining, according to the reference pulse timing sequence, a delay of a laser unit corresponding to the sorting unit includes: determining a corresponding optical path difference according to the length of the optical fiber used by the laser unit corresponding to the sequencing unit in the optical path; determining the delay to compensate for the optical path difference based on the reference pulse timing.

In the implementation mode, the corresponding optical path difference is determined according to the length of the optical fiber used by the laser unit in the optical path, so that the time delay for compensating the optical path difference is determined based on the reference pulse time sequence, the pulse time sequence of the laser unit for outputting laser is controlled more accurately, and the pulse optical fiber laser with synchronous pulse time sequence can be output more accurately.

With reference to the first possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, after the corresponding laser unit outputs laser light, the method further includes: acquiring an output pulse time sequence of the laser output by the corresponding laser unit; determining a timing difference between the output pulse timing and the reference pulse timing; and determining the adjusting time delay for compensating the time sequence difference so that the sequencing unit adjusts the laser output instruction according to the adjusting time delay.

In the implementation mode, the time sequence difference between the output pulse time sequence of the corresponding laser unit and the reference pulse time sequence is determined by acquiring the output pulse time sequence of the laser output by the laser unit, and the adjusting time delay is further determined, so that the sequencing unit adjusts the laser output instruction according to the adjusting time delay, the pulse time sequence of the laser output by the laser unit is controlled more accurately, and the pulse fiber laser with higher power and stronger pulse energy is acquired.

In a third aspect, an embodiment of the present application provides a pulse fiber laser beam combining method, which is applied to a timing unit in a high-power MOPA beam combining pulse laser according to the first aspect or any one of the first to fourth possible implementation manners of the first aspect, where the method includes: obtaining a control instruction containing a reference pulse time sequence, and determining the reference pulse time sequence from the control instruction; acquiring an estimated pulse time sequence of the output laser estimated by each laser unit; determining a laser output instruction of a corresponding laser unit according to the estimated pulse time sequence and the reference pulse time sequence; and sending each laser output instruction to a corresponding laser unit, and controlling the corresponding laser unit to output laser.

The estimated pulse time sequence of the output laser estimated by each laser unit is combined with the reference pulse time sequence to determine the corresponding laser output instruction so as to control the pulse time sequence of the output laser of the corresponding laser unit, which is beneficial to obtaining high-power pulse fiber laser, and the high-power MOPA combined beam pulse laser can output higher laser pulse energy and larger pulse width adjustable range.

In a fourth aspect, an embodiment of the present application provides a sorting unit, which is applied to the high-power MOPA combined beam pulse laser according to any one of the first to fourth possible implementation manners of the first aspect.

In a fifth aspect, an embodiment of the present application provides a timing unit, which is applied to the high-power MOPA combined beam pulse laser according to any one of the first to fourth possible implementation manners of the first aspect.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a high-power MOPA beam-combining pulse laser according to an embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of a high-power MOPA beam-combining pulse laser according to an embodiment of the present disclosure.

Fig. 3 is a schematic structural diagram of a high-power MOPA beam-combining pulse laser according to an embodiment of the present disclosure.

Fig. 4 is a flowchart of a pulse fiber laser beam combining method applied to a timing unit according to an embodiment of the present disclosure.

Fig. 5 is a flowchart of a pulse fiber laser beam combining method applied to a sequencing unit according to an embodiment of the present disclosure.

Fig. 6 is a schematic diagram of a pulse-synchronized pulsed fiber laser according to an embodiment of the present disclosure.

Fig. 7 is a schematic diagram of a pulsed fiber laser with unsynchronized pulses according to an embodiment of the present disclosure.

Icon: 10-high power MOPA beam combination pulse laser; 11-a timing unit; 111-a master control unit; 112-sorting unit; 12-a laser unit; 121-a laser source; 122-an amplifier; 123-an online isolator; 13-beam combining unit.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a pulse-beam-combining high-Power MOPA (Power-Amplifier of master oscillator) fiber laser 10 according to an embodiment of the present disclosure. In the present embodiment, the high power MOPA beam combination pulse laser 10 may include a timing unit 11, a plurality of laser units 12, and a beam combination unit 13. The timing unit 11 may be connected to the plurality of laser units 12, and is configured to control a pulse timing of the laser output by the laser units 12; the beam combining unit 13 may be connected to output ends of the plurality of laser units, and is configured to combine the received pulsed optical fiber lasers and output the combined optical fiber lasers.

In this embodiment, the timing unit 11 may be a module, a device, an apparatus, etc. that implements a control function, such as a single chip, a microprocessor, a personal computer, a mobile terminal, etc. The timing unit 11 may obtain a control instruction including a reference pulse timing, for example, by receiving a control instruction sent by another device, or generating a control instruction based on a user operation, and the like, where the control instruction may be used to control the plurality of laser units 12 of the timing unit 11 to output laser light.

After obtaining the control command, the timing unit 11 may adjust the pulse timing of the laser light output by each laser unit 12. Illustratively, the timing unit 11 may obtain an estimated pulse timing of the laser light output by each laser unit 12, where the estimated pulse timing represents a timing of pulses when the laser unit 12 is estimated to output laser light. Illustratively, the estimated pulse timing of the laser unit may be further determined by determining the length of the optical fiber used by the laser unit 12 in the optical path, and determining the corresponding optical path difference according to the length of the optical fiber used. Of course, the factors affecting the estimated pulse timing of the laser unit are not limited to the length of the optical fiber used by the laser unit 12 in the optical path, and may also include other factors, such as the output pulse timing of the laser output by the laser unit 12, and therefore, the manner of determining the estimated pulse timing should not be construed as limiting the present application.

After the estimated pulse timing sequence of each laser unit 12 is determined, the timing unit 11 may determine the laser output instruction of the laser unit 12 according to the reference pulse timing sequence in the control instruction and the estimated pulse timing sequence of the corresponding laser unit 12, and send each laser output instruction to the corresponding laser unit 12, so as to control the corresponding laser unit to output laser. Therefore, the pulse timing of the laser output by each laser unit 12 can be adjusted according to actual needs (for example, the laser with stronger pulse energy and higher power needs to be obtained, and the laser output by a plurality of laser units with consistent pulse timing can be controlled; if the laser with wider pulse width needs to be obtained, the pulse timing interval of the laser output by the laser units 12 can be controlled for a preset time, for example, when the pulse of the laser output by one laser unit 12 is at a low valley value, the pulse of the laser output by another laser unit 12 is controlled to be at a peak value, so that the superimposed laser has wider pulse width), so that the high-power MOPA combined pulse laser 10 can have a more flexible control mode, and the output laser has wider pulse range, higher power, stronger pulse intensity and the like.

It should be noted that the timing unit 11 is only an exemplary one, and another form of the timing unit 11 is given below to control the pulse timing of the laser light output by the high-power MOPA beam-combining pulse laser 10 more accurately and efficiently.

Referring to fig. 2, fig. 2 is a schematic structural diagram of another high-power MOPA beam-combining pulse laser according to an embodiment of the present disclosure.

In this embodiment, the timing unit 11 may include a main control unit 111 and a plurality of sequencing units 112 connected to the main control unit 111, and each sequencing unit 112 may be correspondingly connected to one laser unit 12. The main control unit 111 may issue an instruction (which may be a control instruction) to each sequence unit 112, and each sequence unit 112 may control the pulse timing of the laser output by the corresponding laser unit 12 according to the instruction. Of course, the timing unit 11 may also include a main control unit 111 and a sequencing unit 112, and one sequencing unit 112 is correspondingly connected to a plurality of laser units 12 for controlling the pulse timing of the laser output by the corresponding laser unit 12, so that the description of the timing unit 12 is given by taking the case where the timing unit 11 includes the main control unit 111 and the plurality of sequencing units 112 as an example, and should not be considered as a limitation of the present application.

In the present embodiment, the laser unit 12 may include a laser source 121, an amplifier 122, and an in-line isolator 123. The laser source 121 may be connected to the corresponding sorting unit 112 to output laser light under the control of the corresponding sorting unit 112, thereby adjusting the pulse timing of the output laser light. And the amplifier 122 may be connected to an output end of the laser source 121, and configured to amplify and output the power of the laser light output by the laser source 121. The online isolator 123 may be connected to the amplifier 122, and may be configured to isolate laser light output by the laser unit (i.e., laser light output by the laser source 121 after being amplified by the amplifier 122 and then passing through the online isolator 123) and reflected back after being reflected, and may re-couple the reflected laser light into the optical path, so as to reduce loss of the laser light in the transmission path.

In this embodiment, the beam combining unit 13 may be connected to output ends of the plurality of laser units, and is configured to combine and output the received laser beams.

For example, the beam combining unit 13 may be a common three-input-arm beam combiner, a common seven-input-arm beam combiner, a common nineteen-input-arm beam combiner, and the like, which is not limited herein. Correspondingly, each input arm is correspondingly connected with an output end of one laser unit 12, so that the pulse laser output by each laser unit 12 is input into the beam combiner through the corresponding input arm for beam combination, and the beam combination unit 13 can output the combined laser.

The embodiment of the present application will be described with reference to a practical application example of the high power MOPA combined beam pulse laser 10 provided in the present application. Referring to fig. 3, fig. 3 is a schematic structural diagram of a high-power MOPA beam-combining pulse laser according to an embodiment of the present disclosure.

In this embodiment, the timing unit 12 may include a main control unit 111 and a plurality of sequencing units 112, and each sequencing unit 112 is connected to one laser unit 12. The main control unit 111 may send a control instruction to each sequence unit 112, and each sequence unit 112 may determine the delay of the corresponding connected laser unit 12, and determine that the corresponding instruction is sent to the corresponding laser unit 12 to control the pulse timing of the laser output by the laser unit 12.

In this embodiment, a 200W (watt) MOPA pulse fiber laser may be used as the laser unit 12, the laser source 121 of the laser unit 12 is a CWG (Composite Waveguide) high power laser, the output wavelength of the laser unit 12 is 1064nm (nanometers), the pulse width is adjustable from 10ns to 500ns (nanoseconds), and the repetition frequency is 1 to 4000kHz (hertz).

Correspondingly, the amplifier 122 of the laser unit 12 may include three amplification stages, and the laser light output by the laser light source 121 is amplified in three stages by the MOPA technology (that is, a first amplification stage of the amplifier 122 may be connected to the output terminal of the laser light source 121, a second amplification stage may be connected to the output terminal of the first amplification stage, and a third amplification stage may be connected to the output terminal of the second amplification stage, so that the laser light output by the laser light source 121 may be amplified by the first amplification stage and then output to the second amplification stage, and the laser light output by the first amplification stage may be amplified by the second amplification stage and then output to the third amplification stage, and the laser light output by the second amplification stage may be amplified by the third amplification stage and then output, so that the laser light output by the laser light source 121 is amplified in three stages). The pulse laser with the average power of 200W can be output through three-stage amplification, the pulse width can be consistent, the repetition frequency can be consistent, and the pulse energy is 2mJ (millijoule).

Illustratively, the in-line isolator 123 may be selected according to the laser source 121, the amplifier 122 and the actual requirements, and the specific type of the in-line isolator 123 is not limited herein. By providing the in-line isolator 123, the isolation of the laser source 121 can be maintained, and the laser source 121 and the amplifier 122 can be prevented from being irreversibly destroyed by returning to the light source, and can be re-coupled into the optical fiber, so that the laser unit 12 can output laser light.

It should be noted that in the present embodiment, a 200W (watt) MOPA pulse fiber laser is used as the laser unit 12 (including the laser source 121, the amplifier 122 and the in-line isolator 123), but in practical cases, the specific type of the laser unit 12 may be based on practical needs, and is not limited to such a laser unit 12, and therefore, the present application should not be considered as limited thereto.

Illustratively, the connections between the components (the laser source 121, the amplifier 122, and the in-line isolator 123) of the laser unit 12 and the connections between the laser unit 12 and the beam combining unit 13 may be selected from suitable optical fibers (which may be selected according to the specifications of the amplifier 122 and the beam combining unit 13) to ensure efficient transmission of laser light. For example, when a 200W MOPA pulse fiber laser (i.e., the laser unit 12) is connected to one input arm of a three-input-arm beam combiner (i.e., the beam combining unit 13), a 30um core diameter 0.065NA (Numerical Aperture) signal fiber may be used, and the scheme using the 30um core diameter light source is more mature in technical support than the multimode output light source, and also has higher manufacturability and stability. However, this method should not be construed as limiting the present application, and may be applied to any practical situation or requirement.

The combining unit 13 may output the pulse fiber laser beams input from a plurality of (e.g., 3 input arms, and correspondingly, the number of the laser units 12 is also 3) input arms to a QBH (fiber laser optical cable), so as to output the combined pulse fiber laser beams.

The high-power MOPA combined pulse laser 10 is used for laser combination, and the pulse timing sequence output by each laser unit 12 can be regulated, so that the pulse fiber laser output by the high-power MOPA combined pulse laser 10 can have higher power (200W × 3 ═ 600W, that is, the power superposition of a plurality of 200W MOPA pulse fiber lasers and the output of 600W pulse fiber lasers can be realized), stronger pulse energy can be provided (the superposition of the pulse energy of a plurality of laser units 12 can be realized), and a wider pulse width adjustable range is provided.

The high power MOPA closes a beam pulse laser that this application embodiment provided, through the pulse time sequence of a plurality of laser unit output laser of time sequence unit control, and close a beam unit and close a beam with the laser of a plurality of laser unit output, can realize the power stack with a plurality of laser unit output laser, thereby obtain the pulse fiber laser of high power, and, can make high power MOPA close a beam pulse laser output's laser pulse energy higher, the pulse width adjustable range is bigger, thereby parameter performance is also better.

And the high-power MOPA beam-combining pulse laser is adopted to combine the laser to obtain the high-power pulse fiber laser, so that the pressure of high output power (namely, the high-power pulse fiber laser is output) can be distributed to each single light source (namely, the laser unit) in a beam-combining mode. The pulse energy can be improved by beam combination, so that the nonlinear effect of the laser obtained after beam combination is consistent with that of a single light source (namely a laser unit), thereby having better manufacturability and stability and reducing the difficulty of industrial manufacturing.

In addition, according to the high-power MOPA beam combination pulse laser provided by the embodiment of the application, the isolator is advanced to the rear of a single light source (namely the tail of the laser unit) before beam combination by adopting the online isolator, so that the bearing power of the isolator can be reduced (if the isolator is placed behind the beam combination unit, the isolator needs to bear higher-power pulse fiber laser obtained after beam combination), and the size and the weight of an output end (namely the output end of the beam combination unit or the output end of the QBH) can be reduced.

Furthermore, the high-power MOPA beam-combining pulse laser provided by the embodiment of the application can change the optical path difference by changing the pulse timing of the laser unit and the length of the optical fiber, so that the pulse width of the laser obtained after beam combination is changed. This eliminates the need to increase the pulse width by the seed source (i.e., laser source), thereby avoiding the decrease in lifetime and TEC (semiconductor Cooler) failure caused by the increase in pulse width by the seed source.

In order to accurately control the pulse time sequence of the laser output by the high-power MOPA beam combination pulse laser, the embodiment of the application further provides a pulse fiber laser beam combination method.

Referring to fig. 4, fig. 4 is a schematic diagram of a pulse fiber laser beam combining method applied to a timing unit of a high-power MOPA beam combining pulse laser according to an embodiment of the present disclosure. In the present embodiment, the pulse fiber laser beam combining method applied to the timing unit may include step S11, step S12, step S13, and step S14.

In this embodiment, in order to control and adjust the output power, pulse energy, pulse width, and/or the like of the high-power MOPA combined-beam pulsed laser, the pulse timing of the laser unit output laser by the timing unit may be controlled. The implementation manner is described here with a sequential unit as an execution body. That is, the timing unit may perform step S11.

Step S11: and obtaining a control instruction containing a reference pulse timing sequence, and determining the reference pulse timing sequence from the control instruction.

In this embodiment, the timing unit may obtain a control command including the timing of the reference pulse. The reference pulse sequence may be regarded as a reference pulse sequence included in the control command, and the pulse sequence of the laser output by each laser unit may be determined based on the reference pulse sequence (for example, when the laser output by different laser units is to be consistent with the reference pulse sequence or different from the reference pulse sequence by N cycles, N is a rational number); the control instruction is used for controlling the high-power MOPA beam-combining pulse laser to output laser. The manner in which the timing unit obtains the control instruction may be that the timing unit receives a control instruction sent by another device or apparatus, or may be a control instruction generated by the timing unit based on a preset program, or a control instruction generated in response to an operation of a user, which is not specifically limited herein.

After obtaining the control command, the timing unit may determine a reference pulse timing from the control command.

After determining the reference pulse timing, the timing unit may perform step S12.

Step S12: and acquiring the estimated pulse time sequence of the output laser estimated by each laser unit.

In order to accurately control the laser units, the timing unit may determine an estimated pulse timing for each laser unit, wherein the estimated pulse timing represents a pulse timing of the estimated laser unit outputting laser light.

Illustratively, the estimated pulse timing for a laser unit may be determined by the length of optical fiber used by the laser unit in the optical path. Specifically, the timing unit may determine the length of the optical fiber used in the optical path of the laser unit, and determine the optical path difference caused by the length of the optical fiber. And the optical path difference can be changed by adjusting the pulse time sequence of the laser output by the laser unit, so that the waveform output by the laser unit can be changed by matching, and the output power, the pulse width, the pulse energy and the like of the laser output by the high-power MOPA beam-combining pulse laser are adjusted.

In practice, it may be time-consuming and labor-intensive to change the length of the optical fiber used. Therefore, the embodiment of the present application describes a case of changing a pulse timing as an example, but should not be construed as limiting the present application, and the method provided in the embodiment of the present application may also change a waveform of laser light output by a laser unit by changing a length of an optical fiber used, so as to achieve the effects of adjusting output power, pulse width, pulse energy, and the like of laser light output by the high-power MOPA combined-beam pulse laser.

For example, the optical path difference can be changed by changing the pulse timing of the laser unit, so that the rising edge of the pulse of the output waveform of the laser unit coincides with the rising edge of the pulse of the output waveform of another laser unit in the high-power MOPA beam-combining pulse laser. In this way (by making the rising edge of the pulse of one laser unit output waveform coincide with the falling edge of the pulse of the other laser unit output waveform), a wider pulse width range of the waveform can be output. And the output power and the pulse energy of the laser output by the high-power MOPA beam-combining pulse laser can be changed by the superposition mode of the pulses of the output waveforms of the plurality of laser units.

For example, when the pulses of the output waveforms of each laser unit are overlapped, the output power and the pulse energy of the output laser of the high-power MOPA combined pulse laser reach the maximum value, and the output power and the pulse energy are overlapped (for example, when the output waveforms of 7 laser units of 200W and 2mJ are completely overlapped, the output power is 1400W, and the pulse energy is 14 mJ). If the pulses of the output waveforms of each laser unit are not overlapped, the output power and the pulse energy of the output laser of the high-power MOPA combined-beam pulse laser are minimum (namely, the output power and the pulse energy of the output laser of a single laser unit are 200W and 2mJ when the output waveforms of 7 laser units with 200W and 2mJ are not overlapped at all, the output power is 200W and the pulse energy is 2 mJ). Therefore, the output power and pulse energy of the output laser of the high-power MOPA beam-combining pulse laser can be adjusted between the maximum value (the output power and pulse energy which are completely overlapped and have no loss) and the minimum value (the output power and pulse energy which are not overlapped at all and are only the output power and pulse energy of a single laser unit) through the timing unit.

Therefore, in order to achieve accurate adjustment of the pulse timing of the laser output from the laser unit, after determining the estimated pulse timing of the laser unit, the timing unit may perform step S13.

Step S13: and determining the laser output instruction of the corresponding laser unit according to the estimated pulse time sequence and the reference pulse time sequence.

In this embodiment, the timing unit may determine the laser output command of the corresponding laser unit according to the estimated pulse timing and the reference pulse timing. It should be noted that, here, the timing unit can determine the output parameters of the output power, the pulse energy and the pulse width of the output laser of the high-power MOPA combined-beam pulse laser. For example, the timing unit may determine the output parameters of the output power, the pulse energy and the pulse width preset by the high-power MOPA combined-beam pulse laser, or may determine the output parameters of the output power, the pulse energy and the pulse width of the high-power MOPA combined-beam pulse laser from the control command, which is not limited herein.

After the output parameters of the output power, the pulse energy and the pulse width of the high-power MOPA combined pulse laser are determined, the timing sequence unit can determine a laser output instruction for controlling the pulse timing sequence of the laser output by the laser unit by combining the reference pulse timing sequence and the estimated pulse timing sequence of the corresponding laser unit so as to control the waveform of the laser output by the laser unit, and further realize accurate control of the output power, the pulse energy, the pulse width and the like of the high-power MOPA combined pulse laser.

After determining the laser output command, the timing unit may perform step S14.

Step S14: and sending each laser output instruction to a corresponding laser unit, and controlling the corresponding laser unit to output laser.

In this embodiment, the timing unit may send each determined laser output instruction to the corresponding laser unit, so that the laser units output laser light under the control of the received laser output instruction, and the beam combining unit combines and outputs the laser light output by the plurality of laser units, thereby implementing the cooperation of the plurality of laser units, and enabling the laser light output by the high-power MOPA combined pulse laser to satisfy the required output power (and/or pulse width, pulse energy, etc.).

In this embodiment, in order to realize more accurate control of output parameters such as output power, pulse width, pulse energy and the like of the high-power MOPA beam combination pulse laser, the timing unit can also acquire the output pulse timing of the laser output by each laser unit, and determine the timing difference between the output pulse timing and the reference pulse timing, the timing difference can be used as an index for adjusting the pre-estimated pulse timing, so as to pre-estimate the pre-estimated pulse timing of the laser unit more accurately, thereby being beneficial to realizing more accurate control of the pulse timing of the laser output by the laser unit. Of course, the timing difference may also be used as an index for adjusting the pulse timing of the laser output by the laser unit in real time, for example, the timing unit may determine an adjustment delay for compensating the timing difference, so that the timing unit adjusts the laser output instruction according to the adjustment delay, thereby implementing more accurate control of the pulse timing of the laser output by the laser unit.

The estimated pulse time sequence of the output laser estimated by each laser unit is combined with the reference pulse time sequence to determine the corresponding laser output instruction so as to control the pulse time sequence of the output laser of the corresponding laser unit, which is beneficial to obtaining high-power pulse fiber laser, and the high-power MOPA combined beam pulse laser can output higher laser pulse energy and larger pulse width adjustable range.

In the embodiment of the present application, a pulse fiber laser beam combining method applied to a sequencing unit in a high-power MOPA beam combining pulse laser may also be provided. Referring to fig. 5, fig. 5 is a flowchart of a pulse fiber laser beam combining method applied to a sequencing unit according to an embodiment of the present disclosure. In the present embodiment, the pulse fiber laser beam combining method applied to the sorting unit may include step S21, step S22, and step S23.

For example, to control the output power, pulse width and/or pulse energy of the output laser of the high-power MOPA beam-combining pulse laser, the main control unit of the timing unit may send the obtained control instruction to each sequential unit, and the sequential unit may perform step S21.

Step S21: and receiving a control instruction sent by the main control unit.

In this embodiment, the sorting unit may receive a control instruction sent by the main control unit. For example, the control command may include a reference pulse timing (please refer to the above for explanation of the reference pulse timing). And the sequencing unit can determine the reference pulse sequence contained in the control instruction after receiving the control instruction.

After determining the reference pulse timing, the sorting unit may perform step S22.

Step S22: and determining a laser output instruction of the laser unit corresponding to the sequencing unit according to the control instruction.

In this embodiment, the sequencing unit may determine, according to the reference pulse timing sequence, a delay of the laser unit corresponding to the sequencing unit, where the delay represents one parameter for adjusting the pulse timing sequence of the laser unit.

Specifically, the sequencing unit may determine a length of an optical fiber used by the corresponding laser unit in the optical path, determine a corresponding optical path difference, and further determine a delay time required to compensate the optical path difference based on the reference pulse timing sequence, thereby implementing adjustment of the pulse timing sequence of the laser output by the laser unit. Determining the difference between the estimated pulse time sequence and the reference pulse time sequence after determining the estimated pulse time sequence, and further determining a laser output instruction; and determining the time delay required for compensating the optical path difference, namely, determining the corresponding time delay by taking the reference pulse time sequence as the reference of the pulse time sequence when the laser is output, and realizing the adjustment of the pulse time sequence of the laser output by the laser unit through the time delay. Although the two methods are different, the pulse fiber laser beam combining method applied to the sequential unit or the pulse fiber laser beam combining method applied to the sequential unit may be any one of the listed methods, and the method should not be considered as a limitation of the present application because the method is different in the implementation body when the method is described.

After the time delay of the corresponding laser unit is determined, a laser output instruction for controlling the laser unit can be determined according to the control instruction and the time delay.

For example, the sequencing unit may generate a corresponding laser output instruction based on the control instruction in combination with the delay of the laser unit. Of course, after the sequencing unit determines output parameters such as output power, pulse width, pulse energy and the like required by the high-power MOPA beam combination pulse laser to output laser, the corresponding laser output instruction is determined by combining the control instruction, the time delay and the output parameters, so that the laser unit is controlled. And the plurality of sequencing units can be processed in parallel, so that the laser output instructions of all laser units in the whole high-power MOPA beam combination pulse laser can be rapidly determined, and the control of the pulse time sequence of the laser output by each laser unit is realized.

After determining the laser output instruction of the laser unit, the sequencing unit may perform step S23.

Step S23: and sending the laser output instruction to the corresponding laser unit so as to control the corresponding laser unit to output laser.

In this embodiment, the sorting unit may send a laser output instruction to the corresponding laser unit to control the laser unit to output laser light. The beam combining unit can combine and output the laser output by each laser unit so as to further realize the control and adjustment of the output power, the pulse width and the pulse energy of the laser output by the high-power MOPA beam combining pulse laser.

Of course, in order to achieve more accurate control of output parameters such as output power, pulse width, and pulse energy of the laser output by the high-power MOPA beam combination pulse laser, after the corresponding laser unit outputs the laser, the sequencing unit may further obtain an output pulse timing sequence of the laser output by the laser unit, and determine a timing sequence difference between the output pulse timing sequence and the reference pulse timing sequence. And the sequencing unit can determine the adjusting time delay for compensating the time sequence difference so as to adjust the laser output instruction according to the adjusting time delay. The adjustment of the laser output instruction herein may refer to the adjustment process of the laser output instruction in the pulse fiber laser beam combining method applied to the time sequence unit (the difference is that in the pulse fiber laser beam combining method applied to the time sequence unit, the execution main body is the time sequence unit and the adjustment delay of more than one laser unit needs to be determined, whereas in the pulse fiber laser beam combining method applied to the sequencing unit, the execution main body is the sequencing unit and the adjustment delay of the laser unit corresponding to the sequencing unit needs to be determined), and is not described herein again.

The laser output instruction of the corresponding laser unit is determined by receiving the control instruction sent by the main control unit, so that the laser unit is controlled to output laser, the pulse time sequence of the laser unit can be adjusted, and the pulse fiber laser with the required peak power and/or pulse width can be acquired.

By the high-power MOPA beam combination pulse laser and the beam combination method, pulse-synchronized pulse fiber laser with required peak power and/or pulse width can be obtained, as shown in FIG. 6.

The pulse fiber laser beam that is combined but not pulse-synchronized is shown in fig. 7.

Where peakpower represents the peak power and pulsewidth represents the pulse width. It can be seen that the pulse fiber laser that is beam-combined and pulse-synchronized can have a significant difference in peak power and pulse width compared to the pulse fiber laser that is beam-combined and pulse-synchronized.

The embodiment of the present application further provides a sequencing unit, which is applied to the high-power MOPA beam-combining pulse laser in the embodiment of the present application, and the sequencing unit is configured to execute the pulse fiber laser beam-combining method applied to the sequencing unit in the embodiment of the present application.

The embodiment of the present application further provides a timing unit, which is applied to the high power MOPA beam combining pulse laser in the embodiment of the present application, and the timing unit is used for executing the pulse fiber laser beam combining method applied to the timing unit in the embodiment of the present application.

To sum up, this application embodiment provides a high power MOPA closes a bundle pulse laser, divides preface unit and time sequence unit, high power MOPA closes a bundle pulse laser and passes through the pulse time sequence of time sequence unit control a plurality of laser unit output laser, and close a bundle unit and close the laser of a plurality of laser unit outputs and restraint, can realize the power stack with a plurality of laser unit output laser to obtain the pulse fiber laser of high power, and, can make high power MOPA close the laser pulse energy of a bundle pulse laser output higher, the pulse width adjustable range is bigger, thereby parameter performance is also better.

In the embodiments provided in the present application, it should be understood that the disclosed units and methods may be implemented in other ways. The above-described elements are merely illustrative, and for example, the division of the elements into only one logical functional division may be implemented in practice in other ways, and for example, multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.

In addition, units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (7)

1. A high-power MOPA beam-combining pulse laser, comprising:

a plurality of laser units for outputting laser light;

the time sequence unit is connected with the laser units and is used for controlling the pulse time sequence of the laser output by the laser units;

and the beam combining unit is connected with the output ends of the laser units and is used for combining and outputting the received laser beams.

2. The high power MOPA beam-combining pulsed laser of claim 1, wherein the timing unit comprises a master control unit and a plurality of sequencing units,

the main control unit is respectively connected with each sequencing unit and used for issuing instructions to each sequencing unit;

and each sequencing unit is correspondingly connected with each laser unit and used for controlling the pulse time sequence of the laser output by the laser unit according to the instruction.

3. The high power MOPA beam-combining pulsed laser according to claim 2, wherein the laser unit comprises a laser source,

the laser source is connected with the corresponding sequencing unit and used for outputting laser under the control of the sequencing unit.

4. The high power MOPA beam-combining pulsed laser according to claim 3, wherein the laser unit further comprises an amplifier,

the amplifier is used for amplifying the power of the laser output by the laser source and then outputting the amplified power.

5. The high power MOPA beam-combining pulsed laser according to claim 3, wherein the laser unit further comprises an in-line isolator,

the online isolator is used for isolating laser which is output by the laser unit and reflected back.

6. A sequencing unit, which is applied to the high-power MOPA beam-combining pulse laser as claimed in any one of claims 2 to 5.

7. A timing unit, applied in the high power MOPA beam-combining pulse laser of any one of claims 1 to 5.

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