CN107492780A - Dipulse optical-fiber laser output intent based on gain switch technology - Google Patents
Dipulse optical-fiber laser output intent based on gain switch technology Download PDFInfo
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- CN107492780A CN107492780A CN201710789714.9A CN201710789714A CN107492780A CN 107492780 A CN107492780 A CN 107492780A CN 201710789714 A CN201710789714 A CN 201710789714A CN 107492780 A CN107492780 A CN 107492780A
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- pulse
- laser
- pumping
- optical fiber
- output
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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
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The invention discloses a kind of dipulse optical-fiber laser output intent based on gain switch technology.It is of the invention mainly to obtain the output of double-pulse laser using by changing in laser the method for pumping pulse energy and pumping pulse width, by using double-pulse laser efficiency high, power is high the advantages of and applied material process and punching in terms of.The present invention uses gain switch technology modulation optical fiber laser, has the advantages that simple in construction, operation is easy.
Description
Technical field
The invention belongs to laser technology field, more particularly to a kind of double-pulse laser output side based on gain switch technology
Method.
Background technology
With the continuous development of pulse laser, laser processing technology and laser drilling have also obtained progress.In recent years,
Punching or processing are the focuses of industry extensive concern on the materials such as ceramics, metal, compared with single-pulse laser is processed, double arteries and veins
Rush laser processing technology and substantially increase crudy and process velocity.In addition, double-pulse laser is ground in correlations such as sensing, materials
Studying carefully field has significant application value.
Realizing the main method of dual pulse welding laser output at present includes：1st, based on Q-regulating technique, in solid state laser
Resonator in place frequency-doubling crystal and Q-switch and cause the optical figure of merit Q value mutations of resonator to produce the side of dipulse
Method.Its major defect is that laser structure is excessively complicated, and pulse energy drops due to being limited by these element damage threshold values
It is low.2nd, the laser a laser transmitting is divided into two beams, wherein laser is after suitable time-delay all the way, by polarization or again
Frequency is combined into a branch of with another way laser again, and fine delay on passage time produces dipulse.The shortcomings that this method is to prolong
The slow time can only be controlled within 50ns or so shorter times, and required very high to the beam quality of laser.Therefore, one is invented
Kind is simple in construction, and the high dual pulse welding of pulse energy is significant.
Gain switch technology is that another in addition to common Q-regulating technique and electrical modulation continuous laser can produce height
The modulation technique of the nanosecond pulse sequence of repetition rate.Gain switch dipulse optical fiber laser only has a simple laser humorous
Shake chamber, without component outside any extra intracavitary or chamber, so it has the advantages that simple in construction, output energy is higher.
The content of the invention
Invention applies gain switch technology, it is proposed that a kind of pulse energy and pulse width by controlling pumping source
To produce the method for Nanosecond Pulses laser.
The method of the present invention includes following steps：
Step（1）Selection one pulsewidth be 100kHz for T (10~900ns) repetitive rate pulse driver, a wavelength be
975nm semiconductor laser, 975/1064nm bundling device, one section of Yb dosed optical fiber and a reflectivity 95%~
100% Bragg grating, Bragg grating of the reflectivity 50%~90%, two Fiber Bragg Grating FBGs have identical
Centre wavelength（1050nm to 1080nm）；It is set to produce arteries and veins of the pulsewidth as nanosecond to modulate semiconductor kistributed-feedback laser using pulse driver
Impulse light is so as to be used as pumping source, and Yb dosed optical fiber is the working media of laser, and two Fiber Bragg Grating FBGs are as reflection
Mirror forms the resonator of laser.
The pulse driver output end interface that repetition rate is 100kHz by step (2), pulsewidth is T (10~900ns) connects
975nm semiconductor lasers control the output pulse width of semiconductor laser, pulse energy and repetition rate equivalent with this；
The output port of 975nm semiconductor lasers is connected with the pump ports optical fiber of 975/1064nm bundling devices；Reflectivity is 95%
~100% Fiber Bragg Grating FBG（FBG1 one end optical fiber) connects with the public port of 975/1064nm bundling devices, optical fiber cloth
Glug grating（FBG1 other end optical fiber) connects with the one end for the Yb dosed optical fiber that length is L；Length is L Yb dosed optical fiber
The other end and the Fiber Bragg Grating FBG that reflectivity is 50%~90%（FBG2）One section of optical fiber connection；Reflectivity is 50%~90%
Fiber Bragg Grating FBG（FBG2）Other end as laser output mouth.
Step（3）Unlatching pulsewidth is T (10~900ns) pulse driver and 975nm semiconductor lasers, and setting is partly led
The pumping repetitive rate of body laser output pulse laser is 100kHz, and pumping pulse width is that T is constant, and pumping pulse energy is set
It is set to E0, the pulse now exported is pulse.Then pumping pulse energy is stepped up, until output laser double-pulse.
During this, first laser pulse results from pumping pulse and not yet reaches its peak value（I.e. first pulse has produced,
But pumping pulse not yet reaches its peak value）Energy level particle is rapidly consumed on period.But due to there is most
Pumping pulse energy is not consumed during this period of time.So on after first pulse exports energy level population still after
Continuous accumulation and again exceeded threshold, so that still having second pulse output, i.e. dipulse after first pulse shaping
Output.
Unlatching pulsewidth is T (10~900ns) pulse driver and 975nm semiconductor lasers, sets semiconductor laser
The pumping repetitive rate of device output pulse laser is 100kHz, and pumping pulse energy is that E is constant, and pumping pulse width is set as
T0, the pulse now exported is pulse.Then pumping pulse width is stepped up, when pumping width increases to some value
Pumping pulse energy is not consumed completely by first laser pulse, may result in the generation of dipulse.
The present invention is mainly suitable for dual pulse welding field, by changing the pulse energy of pumping source or changing pumping source
Two methods of pulse width obtain double-pulse laser output.Gain switch dipulse optical fiber laser due to it is simple in construction,
Pulse width is narrower so to build such a laser significant.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Embodiment
As shown in figure 1, the device for realizing the output of gain switch dipulse optical fiber laser is including a repetition rate
100kHz pulse widths are T (10~900ns) the 975nm semiconductor lasers 2, one 975/ of pulse driver 1, one
The Yb dosed optical fiber 5 and one that Fiber Bragg Grating FBG 4 that 3, reflectivity of 1064nm bundling devices are 99%, a segment length are 10cm
Individual reflectivity is 80% Fiber Bragg Grating FBG 6.
The method of specific implementation gain switch dipulse optical fiber laser laser output comprises the following steps：
Step（1）Selection one pulsewidth be 100kHz for T (10~900ns) repetitive rate pulse driver, a wavelength be
975nm semiconductor laser, 975/1064nm bundling device, the Yb dosed optical fiber that a segment length is 10cm and a reflection
Optical fiber bragg grating FBG 1 of the rate 99%, optical fiber bragg grating FBG 2 of the reflectivity 80%, two optical fiber Bradleys
Lattice grating has identical centre wavelength（1064nm）；It is set to produce pulsewidth to receive to modulate semiconductor kistributed-feedback laser using pulse driver
The pulse laser of second level is so as to be used as pumping source, and Yb dosed optical fiber is the working media of laser, two Fiber Bragg Grating FBGs
The resonator of laser is formed as speculum.
The pulse driver output end interface that repetition rate is 100kHz by step (2), pulsewidth is T (10~900ns) connects
975nm semiconductor lasers control the output pulse width of semiconductor laser, pulse energy and repetition rate equivalent with this；
The output port of 975nm semiconductor lasers is connected with the pump ports optical fiber of 975/1064nm bundling devices；Reflectivity is 99%
Fiber Bragg Grating FBG（FBG1 one end optical fiber) connects with the public port of 975/1064nm bundling devices, optical fiber Bragg light
Grid（FBG1 other end optical fiber) connects with the one end for the Yb dosed optical fiber that length is 10cm；Length is the another of 10cm Yb dosed optical fiber
One end and the Fiber Bragg Grating FBG that reflectivity is 80%（FBG2）The connection of one end optical fiber；Reflectivity is 80% optical fiber Bragg
Grating（FBG2）Other end as laser output mouth.
Step（3）Unlatching pulsewidth is T (10~900ns) pulse driver and 975nm semiconductor lasers, and setting is partly led
The pumping repetitive rate of body laser output pulse laser is 100kHz, and pumping pulse width is that 400ns is constant, by pumping pulse energy
Amount is set as E0, the pulse now exported is pulse.Then pumping pulse energy is stepped up, until the double arteries and veins of output laser
Punching.In this process：First laser pulse results from pumping pulse and not yet reaches its peak value（That is first pulse is
Produce, but pumping pulse not yet reaches its peak value）Energy level particle is rapidly consumed on period.But due to there is a big portion
The pumping pulse energy divided is not consumed during this period of time.So energy level population is still on after first pulse exports
Accumulation and exceeded threshold again in continuation, so that still there is second pulse output after first pulse shaping, i.e., pair
Pulse exports.
Unlatching pulsewidth is T (10~900ns) pulse driver and 975nm semiconductor lasers, sets semiconductor laser
The pumping repetitive rate of device output pulse laser is 100kHz, and pumping pulse energy is 0.4 MJ constant, and pumping pulse width is set
It is set to T0, the pulse now exported is pulse.Then pumping pulse width is stepped up, when pumping width increases to some
Pumping pulse energy is not consumed completely by first laser pulse during value, may result in the generation of dipulse.
It is of the invention main to be obtained using by changing in laser the method for pumping pulse energy and pumping pulse width
The output of double-pulse laser, by using double-pulse laser efficiency high, power is high the advantages of and applied material processing and
In terms of punching.The present invention uses gain switch technology modulation optical fiber laser, has the advantages that simple in construction, operation is easy.
Claims (1)
1. the dipulse optical-fiber laser output intent based on gain switch technology, it is characterised in that this method is specifically：
Step（1）One pulsewidth of selection is 10~900ns, the pulse driver that repetitive rate is 100kHz, a wavelength are 975nm
Semiconductor laser, 975/1064nm bundling device, one section of Yb dosed optical fiber and a reflectivity be in 95%~100% Bradley
Lattice grating FBG 1, bragg grating FBG 2 of the reflectivity 50%~90%, two Fiber Bragg Grating FBGs have identical
Centre wavelength, all it is 1050nm to 1080nm；It is set to produce pulsewidth as nanosecond to modulate semiconductor kistributed-feedback laser using pulse driver
Pulse laser so as to be used as pumping source, Yb dosed optical fiber is the working media of laser, two Fiber Bragg Grating FBG conducts
Speculum forms the resonator of laser；
Step（2）Pulse driver output end interface connect into semiconductor laser with this controlled the output arteries and veins of semiconductor laser
Rush width, pulse energy and repetition rate；The output port of semiconductor laser connects with the pump ports optical fiber of bundling device；Light
One end optical fiber of fine bragg grating FBG 1 connects with the public port of bundling device, the other end light of optical fiber bragg grating FBG 1
Fibre connects with one end of Yb dosed optical fiber；The other end of Yb dosed optical fiber connects with one end optical fiber of optical fiber bragg grating FBG 2；Light
The other end of fine bragg grating FBG 2 is as laser output mouth；
Step（3）Unbalanced pulse driver and semiconductor laser, the pumping weight of setting semiconductor laser output pulse laser
Multiple rate is 100kHz, and pumping pulse width is that 10~900ns is constant, and pumping pulse energy is set as into E0, the arteries and veins that now exports
Rush as pulse；Then pumping pulse energy is stepped up, until output laser double-pulse；In this process, first is swashed
Light pulse results from upper energy level particle during pumping pulse not yet reaches its peak value and rapidly consumed；It is but one big due to having
Partial pumping pulse energy is not consumed during this period of time；So energy level population is still on after first pulse exports
The so accumulation in continuation and exceeded threshold again, so that still having second pulse output after first pulse shaping, i.e.,
Pulse-pair output；
Or unbalanced pulse driver and semiconductor laser, the pumping repetitive rate of setting semiconductor laser output pulse laser
For 100kHz, pumping pulse energy is that E is constant, and pumping pulse width is set as into T0, the pulse now exported is pulse；So
After be stepped up pumping pulse width, when pumping width increases to some value, pumping pulse energy is not by first laser arteries and veins
Punch and totally disappeared consumption, may result in the generation of dipulse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710789714.9A CN107492780A (en) | 2017-09-05 | 2017-09-05 | Dipulse optical-fiber laser output intent based on gain switch technology |
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| CN201710789714.9A CN107492780A (en) | 2017-09-05 | 2017-09-05 | Dipulse optical-fiber laser output intent based on gain switch technology |
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| CN201710789714.9A Pending CN107492780A (en) | 2017-09-05 | 2017-09-05 | Dipulse optical-fiber laser output intent based on gain switch technology |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100226395A1 (en) * | 2005-07-26 | 2010-09-09 | Min Jiang | Gain-switched fiber laser system |
| US20130016422A1 (en) * | 2011-07-13 | 2013-01-17 | Tzong-Yow Tsai | Q-switching-induced Gain-switched Erbium Pulse Laser System |
| CN103036136A (en) * | 2013-01-16 | 2013-04-10 | 山东海富光子科技股份有限公司 | Gain switch pulse type single-frequency optical fiber laser |
| US20150304051A1 (en) * | 2014-04-22 | 2015-10-22 | Kabushiki Kaisha Toshiba | Optical device |
-
2017
- 2017-09-05 CN CN201710789714.9A patent/CN107492780A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100226395A1 (en) * | 2005-07-26 | 2010-09-09 | Min Jiang | Gain-switched fiber laser system |
| US20130016422A1 (en) * | 2011-07-13 | 2013-01-17 | Tzong-Yow Tsai | Q-switching-induced Gain-switched Erbium Pulse Laser System |
| CN103036136A (en) * | 2013-01-16 | 2013-04-10 | 山东海富光子科技股份有限公司 | Gain switch pulse type single-frequency optical fiber laser |
| US20150304051A1 (en) * | 2014-04-22 | 2015-10-22 | Kabushiki Kaisha Toshiba | Optical device |
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Application publication date: 20171219 |
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