CN112652940B - Multi-path output laser - Google Patents
Multi-path output laser Download PDFInfo
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- CN112652940B CN112652940B CN201910970225.2A CN201910970225A CN112652940B CN 112652940 B CN112652940 B CN 112652940B CN 201910970225 A CN201910970225 A CN 201910970225A CN 112652940 B CN112652940 B CN 112652940B
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- picosecond
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08086—Multiple-wavelength emission
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
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Abstract
The invention discloses a multi-output laser, which comprises a picosecond optical fiber seed source and a first optical fiber beam splitter, wherein the output end of the picosecond optical fiber seed source is connected with the input end of the optical fiber beam splitter; the picosecond optical fiber seed source generates picosecond optical pulses, the picosecond optical pulses are divided into a plurality of paths by the first optical fiber beam splitter, a stretcher is arranged on at least one path, and a power amplifier is arranged at the output end of each path. The invention uses the optical fiber picosecond laser as a seed, and each path respectively amplifies power and widens pulse width to finally obtain multiple paths of laser outputs with different pulse widths, thereby meeting the requirements of industrial processing on increasing efficiency and fineness.
Description
Technical Field
The invention relates to the technical field of laser devices, in particular to a multi-output laser device.
Background
With the development of laser technology, the requirements of laser processing on lasers are higher and higher, and the lasers are diversified, so that the same laser can be used for cutting and punching and can also be used for fine marking and scribing. In addition, various materials have different requirements on laser power, frequency, pulse width and energy, and even the number of pulses in each period. And the fineness of the processing is higher and higher along with the upgrade of the manufacturing industry. The picosecond laser almost has no heat influence area due to narrow pulse width and high peak value, and belongs to a cold processing light source of a new generation. Especially, the laser with the pulse width less than ten picoseconds has no conduction of electron motion to crystal lattices, almost no heat generation, micron-scale fine processing can be realized, and the processing quality is highest. There is a great need for a multiple output laser that can be tuned to a variety of parameters, ranging in pulse width from ten picoseconds, hundreds of picoseconds, to ten nanoseconds.
At present, most of the existing various lasers have adjustable laser power and frequency, and some lasers have adjustable pulse width. However, the existing laser with adjustable pulse width is single-path output, and cannot meet the high-efficiency processing requirement of multi-path simultaneous output. Basically, the range of pulse width adjustment from a few nanoseconds to continuity is realized through acousto-optic, electro-optic or mechanical chopping, and the requirement of fine processing on picosecond-level pulse width cannot be met. The pulse width adjustment of dozens to hundreds of picoseconds is realized by adjusting the optical fiber chirp compensation module, the pulse width adjustment is realized by multiplexing the light splitting time delay, the single path is 100ps, and the five paths are combined to realize 500ps, and the requirements of ten picosecond-level high precision and nanosecond-level high energy cannot be met.
Disclosure of Invention
In view of this, it is necessary to provide a multi-output laser device in order to solve the technical problem that the prior art cannot meet the high-efficiency processing requirement of multi-simultaneous output.
The invention provides a multi-output laser, which comprises a picosecond optical fiber seed source and a first optical fiber beam splitter, wherein the output end of the picosecond optical fiber seed source is connected with the input end of the optical fiber beam splitter;
the picosecond optical fiber seed source generates picosecond optical pulses, the picosecond optical pulses are divided into a plurality of paths by the first optical fiber beam splitter, a stretcher is arranged on at least one path, and a power amplifier is arranged at the output end of each path.
Further, the stretcher pulse width stretching levels set on different paths are different.
Further, the power amplifiers disposed on different paths have different amplification power levels.
Further, the optical fiber pre-amplifier is further included, and the picosecond optical fiber seed source is connected with the first optical fiber beam splitter through the optical fiber pre-amplifier.
Still further, the fiber optic seed generator further comprises a menu selector arranged between the picosecond fiber seed source and the first fiber splitter.
Still further, the optical fiber preamplifier includes a first optical fiber preamplifier and a second optical fiber preamplifier, the picosecond optical fiber seed source is connected with the menu device through the first optical fiber preamplifier, and the menu device is connected with the first optical fiber beam splitter through the second optical fiber preamplifier.
Further, still include second fiber optic splitter, first fiber optic splitter will picosecond light pulse divide into first pulse light path and second pulse light path set up first power amplifier on first pulse light path second pulse light path sets up second fiber optic splitter, second fiber optic splitter will second pulse light path divide into first pulse light branch road and second pulse light branch road set up first stretcher and second power amplifier on the first pulse light branch road set up second stretcher and third power amplifier on the second pulse light branch road.
Further, the pulse width broadening of the first stretcher is in the order of hundred picoseconds, and the pulse width broadening of the second stretcher is in the order of nanoseconds.
Further, the amplification power of the first power amplifier is in the order of watts, the amplification power of the second power amplifier is in the order of ten watts, and the amplification power of the third power amplifier is in the order of fifty watts.
Furthermore, the first optical fiber beam splitter divides the picosecond light pulse into a first pulse light path and a second pulse light path by adopting a first beam splitting ratio, and the second optical fiber beam splitter divides the second pulse light path into a first pulse light branch and a second pulse light branch by adopting a second beam splitting ratio.
The invention uses the optical fiber picosecond laser as a seed, and each path respectively amplifies power and widens pulse width to finally obtain multiple paths of laser outputs with different pulse widths, thereby meeting the requirements of industrial processing on increasing efficiency and fineness.
Drawings
Fig. 1 is a schematic structural diagram of a multi-output laser according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
Fig. 1 is a schematic structural diagram of a multi-output laser of the present invention, which includes a picosecond optical fiber seed source 1 and a first optical fiber beam splitter 5, wherein an output end of the picosecond optical fiber seed source 1 is connected to an input end of the optical fiber beam splitter 5;
the picosecond optical fiber seed source 1 generates picosecond optical pulses, the picosecond optical pulses are divided into multiple paths by the first optical fiber beam splitter 5, a stretcher is arranged on at least one path, and a power amplifier is arranged at the output end of each path.
Specifically, the picosecond fiber seed source 1 generates a picosecond light pulse. Preferably, the picosecond optical fiber seed source 1 has a repetition frequency of 80MHz, an output average power of about 10mW, a center wavelength of 1030nm, and a pulse width of about 7ps small signal pulses. The picosecond light pulses are multiplexed by the first fiber beam splitter 5.
One of the paths may not be provided with a stretcher, and the other paths may respectively use the stretcher to respectively stretch the pulse width thereof to a preset stretched pulse width level. The pulse width of the pulse width can be respectively widened to the preset widening pulse width level by using a stretcher on all the paths. And finally, amplifying the multipath power to a preset power level by using a power amplifier. Thus, multiple laser outputs at the same frequency are obtained. The processing of different types such as fine marking, high-quality cutting and the like can be respectively realized.
The invention uses the optical fiber picosecond laser as a seed, and each path respectively amplifies power and widens pulse width to finally obtain multiple paths of laser outputs with different pulse widths, thereby meeting the requirements of industrial processing on increasing efficiency and fineness.
In one embodiment, the stretcher pulse width stretching levels arranged on different paths are different.
Specifically, one of the paths may not be provided with a stretcher, and the other paths may respectively use different stretchers to respectively stretch the pulse width to a preset stretched pulse width level. The pulse width of the pulse width can be respectively widened to the preset widening pulse width level by using different expanders on all the paths.
In the embodiment, the laser outputs of multiple paths and different pulse widths under the same frequency are obtained through the stretcher with different stretched pulse width levels, so that different types of processing requirements are met.
In one embodiment, the power amplifier disposed on different paths amplifies different power levels.
In the embodiment, the power amplifiers with different amplification power levels are used for obtaining the multipath laser outputs with different amplification power levels under the same frequency, so that the processing requirements of different types are met.
In one embodiment, the fiber pre-amplifier is further included, and the picosecond fiber seed source is connected with the first fiber splitter through the fiber pre-amplifier.
The power of the optical pulse is reduced after the frequency of the optical pulse is reduced through the menu, and the optical pulse is difficult to directly amplify. In the embodiment, the optical fiber pre-amplifier is added, and amplification is performed before beam splitting, so that amplification can be easily performed to a preset power level after widening.
In one embodiment, the fiber sorting device further comprises a menu selector 3 arranged between the picosecond fiber seed source 1 and the first fiber splitter 5.
In the embodiment, a menu device is added, the menu device controls the time of opening and closing the gate, so that the repetition frequency is reduced to the range of 0-10MHz, and a plurality of sub-pulse train functions, namely, pulse train functions, can be output in each period.
In one embodiment, the fiber preamplifier includes a first fiber preamplifier 2 and a second fiber preamplifier 4, the picosecond fiber seed source 1 is connected with the menu device 3 through the first fiber preamplifier 2, and the menu device 3 is connected with the first fiber splitter 5 through the second fiber preamplifier 4.
In this embodiment, an optical fiber preamplifier is also disposed before the menu device, and the optical power after the menu is increased through power pre-amplification.
In one embodiment, the optical fiber coupler further comprises a second optical fiber beam splitter 6, the first optical fiber beam splitter 5 divides the picosecond light pulse into a first pulse optical path and a second pulse optical path, a first power amplifier 9 is arranged on the first pulse optical path, the second optical fiber beam splitter 6 is arranged on the second pulse optical path, the second optical fiber beam splitter divides the second pulse optical path into a first pulse light branch and a second pulse light branch, a first stretcher 7 and a second power amplifier 10 are arranged on the first pulse light branch, and a second stretcher 8 and a third power amplifier 11 are arranged on the second pulse light branch.
In the embodiment, three paths of beam splitting are realized through two optical fiber beam splitters, and three beams of laser are obtained at the same frequency.
In one embodiment, the pulse width broadening of the first stretcher 7 is in the order of hundred picoseconds, and the pulse width broadening of the second stretcher 8 is in the order of nanoseconds.
Specifically, the pulse width of the first pulse optical path is in the order of ten picoseconds, which is consistent with the picosecond fiber seed source 1, because no stretcher is provided. The pulse of the first stretcher 7 and the pulse of the second stretcher 8 are stretched, so that three paths of pulse widths with the magnitudes of ten picoseconds, hundred picoseconds and nanoseconds are obtained, and different types of processing such as fine scribing, fine marking, high-quality cutting and the like are realized.
In one embodiment, the amplification power of the first power amplifier 9 is in the order of watts, the amplification power of the second power amplifier 10 is in the order of ten watts, and the amplification power of the third power amplifier 11 is in the order of fifty watts.
The embodiment realizes that three paths of power are respectively output by lasers with watt level, ten watt level and fifty watt level under the same frequency. The three different types of lasers can respectively realize different types of processing such as fine scribing, fine marking, high-quality cutting and the like.
In one embodiment, the first fiber beam splitter splits the picosecond light pulse into a first pulse light path and a second pulse light path using a first splitting ratio, and the second fiber beam splitter splits the second pulse light path into a first pulse light branch and a second pulse light branch using a second splitting ratio.
Preferably, the splitting ratio of the first optical fiber splitter is 80:20, and the splitting ratio of the second optical fiber splitter is 60: 40.
Fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention, which is an optical fiber laser outputting multiple channels of different pulse widths, and includes a picosecond optical fiber seed source 1, a first optical fiber preamplifier 2, a menu selector 3, a second optical fiber preamplifier 4, a first optical fiber splitter 5, a second optical fiber splitter 6, a first stretcher 7, a second stretcher 8, a first power amplifier 9, a second power amplifier 10, and a third power amplifier 11.
In this embodiment, the laser is internally provided with the fiber picosecond seed light source 1, provides a signal source needing amplification, and has good beam quality and a pulse width less than 10 ps. The optical fiber picosecond seed light source is amplified by a first optical fiber preamplifier 2 by using a 1-meter 20/130 optical fiber to amplify the power of small signal light to about 300mW, then the gate opening and closing time is controlled by a menu device 3 to reduce the repetition frequency to the range of 0-10MHz, and a plurality of sub-pulse train functions, namely pulse train functions, can be output in each period. Taking 1MHz pulse frequency as an example, the seed light after down-conversion menu is further amplified to about 40mW by passing through a second fiber preamplifier 4 of 1.5 m 20/130. And then the optical fiber is divided into two paths by a first optical fiber beam splitter 5, wherein the beam splitting ratio of the first optical fiber beam splitter 5 is 80:20, 20% of which are passed through a first power amplifier 9, amplified using a 5 meter length of 30/250 fiber to an output power of about 1W with a pulse width <10 ps; in addition, 80% of one end of the first optical fiber is divided into two paths by the second optical fiber beam splitter 6, and the splitting ratio of the second optical fiber beam splitter 6 is 60: 40. then 40% of the paths pass through a first stretcher 7 to obtain different pulse widths, a 3-kilometer-long passive optical fiber SM28 is adopted, the pulse width is stretched to 310ps, the path passes through a second power amplifier 10, a 5-kilometer-long 30/250 optical fiber is adopted, and the power is amplified to 11W; and the other 60 percent of the light passes through a second stretcher 8, a 5-kilometer-long passive optical fiber SM28 is adopted, the pulse width is stretched to 1.3ns, and the light passes through a third power amplifier 11, a 6-kilometer-long 50/400 optical fiber is adopted, and the power is amplified to 55W.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. A multi-output laser is characterized by comprising a picosecond optical fiber seed source and a first optical fiber beam splitter, wherein the output end of the picosecond optical fiber seed source is connected with the input end of the optical fiber beam splitter;
the picosecond optical fiber seed source generates picosecond optical pulses, the picosecond optical pulses are divided into a plurality of paths by the first optical fiber beam splitter, a stretcher is arranged on at least one path, and a power amplifier is arranged at the output end of each path;
the picosecond optical fiber seed source is connected with the first optical fiber beam splitter through the optical fiber preamplifier;
the system also comprises a menu selector arranged between the picosecond optical fiber seed source and the first optical fiber beam splitter;
the optical fiber preamplifier comprises a first optical fiber preamplifier and a second optical fiber preamplifier, the picosecond optical fiber seed source is connected with the menu device through the first optical fiber preamplifier, and the menu device is connected with the first optical fiber beam splitter through the second optical fiber preamplifier;
still include second fiber optic splitter, first fiber optic splitter will the picosecond light pulse divide into first pulse light path and second pulse light path first pulse light path sets up first power amplifier on the second pulse light path sets up second fiber optic splitter, second fiber optic splitter will second pulse light path divide into first pulse light branch road and second pulse light branch road set up first stretcher and second power amplifier on the first pulse light branch road set up second stretcher and third power amplifier on the second pulse light branch road.
2. The multiplexed laser of claim 1, wherein the stretcher pulse width stretching levels provided on different paths are different.
3. The multiplexed output laser of claim 1, wherein the power amplifiers disposed on different paths amplify different power levels.
4. The multi-output laser of claim 1, wherein the first stretcher has a pulse width stretching on the order of hundred picoseconds and the second stretcher has a pulse width stretching on the order of nanoseconds.
5. The multiplexed output laser of claim 1, wherein the amplification power of the first power amplifier is on the order of watts, the amplification power of the second power amplifier is on the order of ten watts, and the amplification power of the third power amplifier is on the order of fifty watts.
6. The multi-output laser according to claim 1, wherein the first fiber beam splitter splits the picosecond light pulse into a first pulse light path and a second pulse light path using a first splitting ratio, and the second fiber beam splitter splits the second pulse light path into a first pulse light branch and a second pulse light branch using a second splitting ratio.
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| CN114883898A (en) * | 2022-05-24 | 2022-08-09 | 西安工业大学 | Array distributed high-power all-fiber laser amplifier |
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| US20090273828A1 (en) * | 2008-04-30 | 2009-11-05 | Raydiance, Inc. | High average power ultra-short pulsed laser based on an optical amplification system |
| CN204118458U (en) * | 2014-08-20 | 2015-01-21 | 广东高聚激光有限公司 | A kind of single mode full-optical-fiber laser |
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| CN104505699A (en) * | 2014-12-05 | 2015-04-08 | 中国科学院西安光学精密机械研究所 | Pulse width adjustable and repeated frequency adjustable narrow line-width all-optical-fiber ultra-short pulse amplification system |
| CN107782713A (en) * | 2016-08-24 | 2018-03-09 | 中国科学院光电研究院 | A kind of Laser induced plasma spectroscopy analytical equipment of achievable laser pulse width from femtosecond to psec consecutive variations |
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| CN108598861A (en) * | 2018-06-25 | 2018-09-28 | 英诺激光科技股份有限公司 | A kind of multiple-channel output laser amplifier system |
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Application publication date: 20210413 Assignee: Zhongguancun Technology Leasing Co.,Ltd. Assignor: BEIJING RECI LASER TECHNOLOGY Co.,Ltd. Contract record no.: X2022980015788 Denomination of invention: A laser with multiple outputs Granted publication date: 20211207 License type: Exclusive License Record date: 20220920 |
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Denomination of invention: A laser with multiple outputs Effective date of registration: 20220921 Granted publication date: 20211207 Pledgee: Zhongguancun Technology Leasing Co.,Ltd. Pledgor: BEIJING RECI LASER TECHNOLOGY Co.,Ltd. Registration number: Y2022980015942 |