CN110277723A - Optimize the method for the related transient response of high-capacity optical fiber laser heat - Google Patents
Optimize the method for the related transient response of high-capacity optical fiber laser heat Download PDFInfo
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- CN110277723A CN110277723A CN201910529635.3A CN201910529635A CN110277723A CN 110277723 A CN110277723 A CN 110277723A CN 201910529635 A CN201910529635 A CN 201910529635A CN 110277723 A CN110277723 A CN 110277723A
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- optical fiber
- fiber laser
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- time
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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
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06716—Fibre compositions or doping with active elements
Abstract
The invention discloses the methods of the related transient response of optimization high-capacity optical fiber laser heat, utilize the time graph of the certain output power lower semiconductor laser temperature of heat diffusion equation simulation calculation；The temperature drift for considering semiconductor laser output center wavelength, is calculated semiconductor laser output center wavelength to the function of time；Then the function of time is modified classical optical fiber laser Rate equations according to the semiconductor laser output wavelength being calculated, and calculates the time graph of the high-capacity optical fiber laser output power of given relevant parameter, obtain transient response time；Optimization modification relevant parameter simultaneously calculates, so as to shorten the transient response time of high-capacity optical fiber laser output power.
Description
Technical field
The invention belongs to field of high power fiber lasers, and in particular to a kind of optimization high-capacity optical fiber laser heat is related
The method of transient response.
Background technique
High-capacity optical fiber laser is since its is compact-sized, high conversion efficiency and the advantages that good beam quality are widely used
In fields such as medical treatment, industrial processes and military and national defenses.In practical applications, high-capacity optical fiber laser transient response often shadow
Ring the service performance of optical fiber laser.Such as in laser beam welding, since initial time period laser power is insufficient, so as to cause
It is soldered material insufficient (incomplete) penetration, so that the defect rate of welding increases.
Wei T, Li J, Zhu J are in " Theoretical and experimental study of transient
response of the Yb-doped fiber amplifier[J]》(Chinese Optics Letters,2012,10
(4): the transient response problem about ytterbium doped optical fiber amplifier output laser pulse 040605.) is had studied in a text.J.Zhu,
T.Yang et al. is in " Reliability study of high brightness multiple single emitter
Diode lasers [C] " it has studied in (Diode Laser Technology&Applications XIII, 2015.) text
The problem of fuel factor and its output center wavelength drift of semiconductor laser.It is continuous caused by being moved by pumping wavelength temperature drift
The transient response optimization problem of optical fiber laser, yet there are no correlative study.
Summary of the invention
The purpose of the present invention is to provide a kind of methods of the related transient response of optimization high-capacity optical fiber laser heat, solve
The transient response optimization problem of jointed fiber laser caused by being moved by pumping wavelength temperature drift.
The technical solution for realizing the aim of the invention is as follows: the side of the related transient response of optimization high-capacity optical fiber laser heat
Method, steps are as follows:
Step 1, the time that output power lower semiconductor laser temperature is given using heat diffusion equation simulation calculation
Curve；
Step 2, the temperature drift for considering semiconductor laser output center wavelength obtain semiconductor laser output center
The function of wavelength versus both time；
Step 3, according to semiconductor laser output center wavelength to the function of time, to classical optical fiber laser rate
Equation group is modified, and calculates the time graph of the high-capacity optical fiber laser output power of given relevant parameter, obtains wink
The state response time；
Step 4, optimization modification relevant parameter simultaneously calculate, and ring so as to shorten the transient state of high-capacity optical fiber laser output power
Between seasonable.
Compared with prior art, the present invention its remarkable advantage is:
(1) it is put forward for the first time the transient response optimization problem of jointed fiber laser caused by being moved by pumping wavelength temperature drift.
(2) method for being put forward for the first time optimization relevant parameter, and effectively shorten continuous caused by the shifting of pumping wavelength temperature drift
The transient response time of optical fiber laser.
Detailed description of the invention
Fig. 1 is the method flow diagram of the related transient response of optimization high-capacity optical fiber laser heat of the invention.
Fig. 2 is the time plot that the present invention implements high-capacity optical fiber laser output power before parameter optimization in 1.
Fig. 3 is the time song that the present invention implements high-capacity optical fiber laser output power after single optimization cooling temperature in 1
Line chart.
Fig. 4 is that the present invention implements high-capacity optical fiber laser output after single optimization gain fibre fibre core doping concentration in 1
The time plot of power.
Fig. 5 be the present invention implement in 1 high-capacity optical fiber laser output power after single optimization gain fibre length when
Half interval contour figure.
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawing.
For the ytterbium-doping optical fiber laser of 976nm wavelength semiconductor pumping, due to the output wave of semiconductor pumping sources
With its temperature drift can occur for length, to influence absorption of the Yb dosed optical fiber (YDF) to pump light.Since ytterbium ion is at 976nm
There are absorption peaks, and under room temperature (20 DEG C), semiconductor laser output center wavelength is generally less than 976nm, with the course of work
Middle semiconductor laser internal temperature gradually rises, and output center wavelength gradually drifts near absorption peak 976nm.This
In the process, YDF gradually increases the absorptivity of pump light, causes what optical fiber laser output power showed to be gradually increasing to become
Gesture, i.e. optical fiber laser transient response are slow.
In conjunction with Fig. 1, the method for the related transient response of optimization high-capacity optical fiber laser heat of the present invention, solve by
The transient response optimization problem of jointed fiber laser caused by pumping wavelength temperature drift is moved, the specific steps are as follows:
Step 1, the time that output power lower semiconductor laser temperature is given using heat diffusion equation simulation calculation
Curve；
Step 2, the temperature drift for considering semiconductor laser output center wavelength obtain semiconductor laser output center
The function lambda of wavelength versus both timeP(t):
λP(t)=λ0+(T(t)-T0)β.
Wherein, T0For cooling temperature, λ0It is semiconductor laser in cooling temperature T0When output wavelength, β for semiconductor swash
The temperature drift coefficient of light device output center wavelength, T (t) are the temperature of semiconductor laser.
Step 3, according to semiconductor laser output center wavelength to the function of time, to classical optical fiber laser rate
Equation group is modified, and calculates the time graph of the high-capacity optical fiber laser output power of given relevant parameter, obtains wink
The state response time.
Wherein, classical optical fiber laser Rate equations are modified, revised optical fiber laser rate equation
Group is as follows:
In formula,WithThe respectively covering optical power of forward and reverse transmission,WithThe respectively signal light power of forward and reverse transmission；N2(z, t) is upper energy level population number density, and N is gain light
Yb in long and slender core3+Doping concentration；ΓpAnd ΓsIt is the fill factor of pump light and signal light respectively；σap(t) and σep(t) respectively
It is absorption and the emission cross section area of pump light；σasAnd σesIt is absorption and the emission cross section area of signal light respectively；αPAnd αPPoint
It is not the loss factor of pump light and signal light；τ is upper energy level particle age；λsFor signal light wavelength；λpIt (t) is that semiconductor swashs
Function of the light device output center wavelength to the time；H is planck constant；C is the light velocity in vacuum, AcIt is core cross sections product；
The fibre laser oscillator for being L for gain fibre length, boundary condition are expressed as
Ps +(0)=R1·Ps -(0),
Ps -(L)=R2·Ps +(L).
Wherein,For total pump power；R1And R2It is the reflectivity of high reflective grid and low reflective grid respectively.
Transient response in the step 3 is as caused by semiconductor laser output center wavelength temperature drift.
Step 4, optimization modification relevant parameter simultaneously calculate, and ring so as to shorten the transient state of high-capacity optical fiber laser output power
Between seasonable.Relevant parameter includes cooling temperature T0, Yb in gain fibre length L and gain fibre fibre core3+Doping concentration.
Improve cooling temperature T0, optical fiber laser output power curve is observed, when optical fiber laser output power rises to
Firm power 95 or more when, the transient response time of record high-capacity optical fiber laser output power at this time.
Increase gain fibre length L, observe optical fiber laser output power curve, when optical fiber laser output power increases
To firm power 95% or more when, the transient response time of record high-capacity optical fiber laser output power at this time.
Promote Yb in gain fibre fibre core3+Doping concentration N, observe optical fiber laser output power curve, when optical fiber swash
When light device output power rises to 95% of firm power or more, the transient state of high-capacity optical fiber laser output power at this time is recorded
Response time.
Embodiment 1
The method of optimization high-capacity optical fiber laser heat correlation transient response of the present invention, steps are as follows:
Step 1 utilizes the time of heat diffusion equation simulation calculation 100W output power lower semiconductor laser temperature
Curve；
Step 2, the temperature drift for considering semiconductor laser output center wavelength obtain semiconductor laser output center
The function of wavelength versus both time；
Step 3, according to semiconductor laser output center wavelength to the function of time, to classical optical fiber laser rate
Equation group is modified, and calculates the time graph of the high-capacity optical fiber laser output power of given relevant parameter, obtains wink
The state response time；
Step 4, optimization modification relevant parameter simultaneously calculate, and ring so as to shorten the transient state of high-capacity optical fiber laser output power
Between seasonable.
Before parameter optimization: cooling temperature T0=20 DEG C；Gain fibre fibre core doping concentration N=4.5 × 1025m-3；Gain light
Fine length L=20m.High-capacity optical fiber laser output intensity time graph is as shown in Fig. 2, power rises to firm power
It is respectively 4.6s and 8.5s the time required to 95% and 97%.
Single optimization cooling temperature: cooling temperature is changed to T0=25 DEG C, other parameters remain unchanged, and high-power fiber swashs
Light device output intensity time graph is as shown in figure 3,95% and 97% required time that power rises to firm power is respectively
0.22s and 1.1s.
Individual gain fiber core doping concentration: gain fibre fibre core doping concentration is changed to, and other parameters remain unchanged,
High-capacity optical fiber laser output intensity time graph is as shown in figure 4,95% required time for rising to firm power is less than
0.1s, until being respectively 0.22s the time required to the 97% of firm power.
Single optimization gain fibre length: being changed to L=30m for gain fibre length, and other parameters remain unchanged, and optical fiber swashs
Light device output intensity time graph is as shown in figure 5,95% and 97% required time that power rises to firm power is respectively less than
0.1s。
In conclusion the present invention can effectively shorten high power jointed fiber laser caused by being moved by pumping wavelength temperature drift
The transient response time of device.
Claims (8)
1. optimizing the method for the related transient response of high-capacity optical fiber laser heat, which is characterized in that the step of method is as follows:
Step 1, the time graph that output power lower semiconductor laser temperature is given using heat diffusion equation simulation calculation；
Step 2, the temperature drift for considering semiconductor laser output center wavelength obtain semiconductor laser output center wavelength
To the function of time；
Step 3, according to semiconductor laser output center wavelength to the function of time, to classical optical fiber laser rate equation
Group is modified, and calculates the time graph of the high-capacity optical fiber laser output power of given relevant parameter, is obtained transient state and is rung
Between seasonable；
Step 4, optimization modification relevant parameter simultaneously calculate, so as to shorten high-capacity optical fiber laser output power transient response when
Between.
2. the method for optimization high-capacity optical fiber laser heat correlation transient response according to claim 1, it is characterised in that:
In step 2, function lambda of the semiconductor laser output center wavelength to the timeP(t) it is expressed as
λP(t)=λ0+(T(t)-T0)β
Wherein, T0For cooling temperature, λ0It is semiconductor laser in cooling temperature T0When output wavelength, β is semiconductor laser
The temperature drift coefficient of output center wavelength, T (t) are the temperature of semiconductor laser.
3. the method for optimization high-capacity optical fiber laser heat correlation transient response according to claim 1, it is characterised in that:
In step 3, classical optical fiber laser Rate equations are modified, revised optical fiber laser Rate equations are such as
Under:
In formula,WithThe respectively covering optical power of forward and reverse transmission,WithPoint
It Wei not positive and reverse transfer signal light power；N2(z, t) is upper energy level population number density, and N is in gain fibre fibre core
Yb3+Doping concentration；ΓpAnd ΓsIt is the fill factor of pump light and signal light respectively；σap(t) and σepIt (t) is pump light respectively
Absorption and emission cross section area；σasAnd σesIt is absorption and the emission cross section area of signal light respectively；αPAnd αPIt is pumping respectively
The loss factor of light and signal light；τ is upper energy level particle age；λsFor signal light wavelength；λPIt (t) is semiconductor laser output
Function of the central wavelength to the time；H is planck constant；C is the light velocity in vacuum, AcIt is core cross sections product；
The fibre laser oscillator for being L for gain fibre length, boundary condition are expressed as
Ps +(0)=R1·Ps -(0),
Ps -(L)=R2·Ps +(L).
Wherein,For total pump power；R1And R2It is the reflectivity of high reflective grid and low reflective grid respectively.
4. the method for optimization high-capacity optical fiber laser heat correlation transient response according to claim 1, it is characterised in that:
Transient response in the step 3 is as caused by semiconductor laser output center wavelength temperature drift.
5. the method for optimization high-capacity optical fiber laser heat correlation transient response according to claim 1, it is characterised in that:
Relevant parameter includes cooling temperature T in step 40, Yb in gain fibre length L and gain fibre fibre core3+Doping concentration N.
6. the method for optimization high-capacity optical fiber laser heat correlation transient response according to claim 5, it is characterised in that:
Improve cooling temperature T0, when optical fiber laser output power rises to 95% or more of firm power, record high power at this time
The transient response time of optical fiber laser output power.
7. the method for optimization high-capacity optical fiber laser heat correlation transient response according to claim 5, it is characterised in that:
Increase gain fibre length L, when optical fiber laser output power rises to 95% or more of firm power, records Gao Gong at this time
The transient response time of rate optical fiber laser output power.
8. the method for optimization high-capacity optical fiber laser heat correlation transient response according to claim 5, it is characterised in that:
Promote Yb in gain fibre fibre core3+Doping concentration N, when optical fiber laser output power rises to 95% or more of firm power
When, record the transient response time of high-capacity optical fiber laser output power at this time.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110794512A (en) * | 2019-12-04 | 2020-02-14 | 中国工程物理研究院激光聚变研究中心 | Grating writing method, grating writing device, optical fiber and optical fiber laser |
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| CN1334981A (en) * | 1999-01-08 | 2002-02-06 | 康宁股份有限公司 | Semiconductor-solid state laser optical waveguide pump device and method |
| CN102185240A (en) * | 2011-04-07 | 2011-09-14 | 中国科学院半导体研究所 | High-power low-noise single-frequency optical fiber laser |
| CN202433656U (en) * | 2012-01-11 | 2012-09-12 | 昂纳信息技术（深圳）有限公司 | Erbium-doped fiber amplifier with transient response control function |
| WO2015006867A1 (en) * | 2013-07-16 | 2015-01-22 | Attodyne, Inc. | Laser control system and method |
| CN109565153A (en) * | 2016-08-25 | 2019-04-02 | 索尼公司 | Semiconductor laser, electronic equipment and the method for driving semiconductor laser |
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2019
- 2019-06-19 CN CN201910529635.3A patent/CN110277723B/en active Active
Patent Citations (5)
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|---|---|---|---|---|
| CN1334981A (en) * | 1999-01-08 | 2002-02-06 | 康宁股份有限公司 | Semiconductor-solid state laser optical waveguide pump device and method |
| CN102185240A (en) * | 2011-04-07 | 2011-09-14 | 中国科学院半导体研究所 | High-power low-noise single-frequency optical fiber laser |
| CN202433656U (en) * | 2012-01-11 | 2012-09-12 | 昂纳信息技术（深圳）有限公司 | Erbium-doped fiber amplifier with transient response control function |
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Non-Patent Citations (1)
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| TAO WEI 等: ""Theoretical and experimental study of transient response of the Yb-doped f iber amplif ier"", 《CHINESE OPTICS LETTERS》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110794512A (en) * | 2019-12-04 | 2020-02-14 | 中国工程物理研究院激光聚变研究中心 | Grating writing method, grating writing device, optical fiber and optical fiber laser |
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