CN110459943A - Solar-pumped laser amplifier and its amplification method suitable for the amplification of multiple wavelength - Google Patents
Solar-pumped laser amplifier and its amplification method suitable for the amplification of multiple wavelength Download PDFInfo
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- CN110459943A CN110459943A CN201910749288.5A CN201910749288A CN110459943A CN 110459943 A CN110459943 A CN 110459943A CN 201910749288 A CN201910749288 A CN 201910749288A CN 110459943 A CN110459943 A CN 110459943A
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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
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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
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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
- H01S3/06729—Peculiar transverse fibre profile
- H01S3/06733—Fibre having more than one cladding
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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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/0915—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light
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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
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/1601—Solid materials characterised by an active (lasing) ion
- H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
- H01S3/1618—Solid materials characterised by an active (lasing) ion rare earth ytterbium
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Abstract
The present invention provides a kind of solar-pumped laser amplifiers suitable for the amplification of multiple wavelength, including mix ytterbium (Yb3+) fiber work substance, optical fiber incidence end mouth, fiber exit port, pumping sunlight and multi-wavelength seed laser, mix ytterbium (Yb3+) fiber work substance be coiled into cyclic structure be arranged between optical fiber incidence end mouth and fiber exit port, pumping sunlight be arranged at optical fiber incidence end mouth and be located at multi-wavelength seed laser above, mix ytterbium (Yb3+) fiber work substance, optical fiber incidence end mouth, fiber exit port, pumping sunlight and multi-wavelength seed laser match work, enable multi-wavelength seed laser to zoom into the amplification of multiple wavelength.Amplification while amplifier of the present invention can be realized multiple wavelength seed laser powers can be applied in wavelength-division multiplex Intersatellite Optical Communication System, can be improved dimensional energy transfer efficiency, the room for promotion rate of information throughput.
Description
Technical field
The present invention relates to laser technology fields, and in particular, to a kind of solar-pumped suitable for the amplification of multiple wavelength is sharp
Image intensifer and its amplification method.
Background technique
As one of the Main way of space laser application, satellite laser communications are to space laser technology and laser amplifier skill
Art proposes the requirements such as high efficiency, high-power, long-life.At the same time, optical-fiber laser amplifying technique is converted with energy
High-efficient, the advantages that laser threshold is low, beam quality is excellent, shelf life is long etc., be the important side of future space laser application
One of to.
Current existing solar-pumped laser amplification technique and optical-fiber laser amplifying technique, are predominantly directed to certain single wavelength
The amplification of laser exports, and principle is that laser power (or the energy under pumping condition is realized in the stimulated radiation light amplification based on light
Amount) amplification.Neodymium-doped yttrium-aluminum garnet (Nd:YAG) becomes most common solar-pumped laser and puts because its high gain, thermal characteristics are good
The solid laser working substance of big device, main optical maser wavelength of amplifying is 1065nm.In 1065nm wave band, most common optical-fiber laser
The working-laser material of amplifier is to mix ytterbium (Yb3+) silica fibre.
However, current solar-pumped laser amplifier and optical fiber laser amplifier are mostly that work is amplified in single wavelength
State, there has been no correlative studys for the solar-pumped optical fiber laser amplifier that multiple wavelength simultaneously amplify.It is more in laser communication field
Wavelength output is the key that communication system realizes wavelength-division multiplex.It is logical in the existing space laser based on solar-pumped laser amplifier
Believe in scheme Design, the laser of multiple and different wavelength is coupled into corresponding modulating system by optical fiber as carrier source respectively
Target electric signal, is respectively loaded on the laser beam of different wave length by system using modulator, is realized using wavelength-division multiplex technique high
Rate laser communication.But for current solar-pumped laser amplifier just for 1065nm wavelength, single optical maser wavelength amplification can only
The modulation and transmission for realizing signal all the way, greatly limit the traffic rate of system, cannot fully demonstrate the speed of optical communication system
Rate advantage.
Therefore, it is necessary to design a kind of working efficiency that can be improved space communication system, by increasing space communication system
The quantity of system carrier wave source wavelength realizes that multi-wavelength is adjusted respectively using solar-pumped optical-fiber laser amplifying technique and wavelength-division multiplex technique
System simultaneously amplifies, can obtain the solar-pumped laser amplifier for being suitable for the amplification of multiple wavelength that traffic rate increases.
Summary of the invention
In view of this, the present invention provides a kind of solar-pumped multi-wavelength optical-fiber lasers for laser space communication system
Amplifying technique；Ytterbium (Yb is mixed in present invention use3+) silica fibre operation material building solar-pumped multiwavelength laser amplifier.It is based on
Solar-pumped laser amplification technique and Fiber laser technology (are higher than threshold power) under the working condition of solar-pumped, and 10
The seed laser of different wave length enters the Yb dosed optical fiber operation material in population inversion state by optical fiber coupling device and sends out
The amplification of optical power (or energy) is realized in raw stimulated radiation transition.
A kind of solar-pumped laser amplifier suitable for the amplification of multiple wavelength provided according to the present invention, including mix ytterbium
(Yb3+) fiber work substance, optical fiber incidence end mouth, fiber exit port, pumping sunlight and multi-wavelength seed laser,
The optical fiber incidence end mouth is located along the same line with fiber exit port, described to mix ytterbium (Yb3+) fiber work object
Matter is coiled into cyclic structure and is arranged between optical fiber incidence end mouth and fiber exit port, and the multi-wavelength seed laser is by different waves
Long multiple laser forms and is located at optical fiber incidence end mouth, and the pumping sunlight is arranged at optical fiber incidence end mouth and is located at
Above multi-wavelength seed laser,
It is described to mix ytterbium (Yb3+) fiber work substance, optical fiber incidence end mouth, fiber exit port, pumping sunlight and Duo Bo
Long seed laser matches work, and the multi-wavelength seed laser is enabled to complete to put while multiple and different wavelength lasers
Greatly.
Further, the space solar-pumped laser amplifier can carry out multiwavelength laser in 950-1075nm wave band
Amplification.
Correspondingly, putting the present invention also provides a kind of solar-pumped laser amplifier suitable for the amplification of multiple wavelength
Big method, which comprises the steps of:
Step 1, pumping sunlight is converged to through optical fiber incidence end mouth and mixes ytterbium (Yb3+) fiber work substance；
Step 2, it is coupled multi-wavelength seed laser to through optical fiber incidence end mouth using optical-fiber bundling means and mixes ytterbium (Yb3+) light
The fibre core of fine operation material, multi-wavelength seed laser are advanced in fibre core；
Step 3, the pump mode of amplifier system inner fiber operation material is cladding pumping, and the coating of optical fiber is the second packet
Layer, the first covering have the function of sunlight waveguide, and pumping sunlight is coupled directly to the first covering in optical fiber；
Step 4, after multi-wavelength seed laser economic cooperation beam, it is coupled into optical fiber doping Yb3+Fibre core.
Further, the step 1 is based on solar-pumped laser technology, when pumping sun optical power density reaches pumping
When threshold power density, ytterbium (Yb is mixed3+) particle realizes particle from low-lying level by pump transition to high level in fiber work substance
Number reversion.
Further, the step 2 is that multichannel different wave length seed laser coupled is entered 1 using optical-fiber bundling device to mix ytterbium
(Yb3+) fiber work substance.
Further, the step 4 is when multi-wavelength seed laser passes through the fiber work in population inversion state
When substance, force high level atomic transition to low-lying level, the energy production light radiation of release, the frequency of excited radiation light, phase,
Polarization state and the direction of propagation are identical as the frequency of incident seed light, phase, polarization state and the direction of propagation respectively.
Further, space multi-wavelength carrier wave light source is continuous laser, and a certain wavelength seed of optical fiber laser amplifier swashs
Gain of light formula can be expressed as follows:
Wherein, G is amplifier gain, PinTo input pump power, A is seed laser facula cross-sectional area, ISFor saturation
Light intensity, G0For small-signal gain,
Wherein, it is saturated light intensity ISIs defined as:
γ is the only reduces value of inverted population after single photon emission, and h is Planck's constant, and v is the frequency of light wave, σ
For stimulated emission cross section, τcFor fluorescence lifetime, laser gain medium mixes Yb3+Corresponding γ=1 of optical fiber, then have:
G0=exp (g0L) (3)
Under the conditions of input energy is lower, i.e. G0Pin< < PS, can approximation obtain:
G≈G0=exp (g0L) (4)
Wherein, g0For small signal gain coefficient, L is the length of optical-fiber laser gain media,
When system is in small-signal operation state, it is assumed that WPτc< < 1, then have:
g0=σ τcn0WP (5)
In formula, n0Indicate ground state population density, σ is stimulated emission cross section, τcFor fluorescence lifetime, WPFor pumping rate, then
n0WPIt indicates that unit time unit volume is transferred to the population of upper laser level from ground state level, then has:
n0WP=ηQn0W03 (6)
In formula, η0For quantum efficiency, W03For from ground state level to upper laser level transition probability,
In conjunction with link energy transfer efficiency each in solar-pumped fiber laser amplifier system, then have:
In formula, rOVP、ηT、ηa、ηu、ηB、PabRespectively indicate spectra overlapping efficiency, efficiency of transmission, absorption efficiency, upper energy level effect
Rate, light beam overlap rate and extraction efficiency, PabExpression system receives sun optical power, vLIndicate Output of laser wavelength, h is Planck
Constant, v are the frequency of light wave, definition saturation light intensity IS, haveThen small signal gain coefficient g0For
It substitutes the above to formula (4), the gain G of available solar-pumped optical fiber laser amplifier
Compared with prior art, the present invention have it is following the utility model has the advantages that
(1) the solar-pumped laser amplifier for being suitable for the amplification of multiple wavelength of the invention, the fibre core of fiber work substance
Doped with rare earth ion ytterbium (Yb3+), mix Yb3+Optical fiber has more apparent emission spectrum in 950nm-1075nm wave band.Utilize this
One spectral characteristic, when fiber work substance is in population inversion state under the conditions of solar-pumped, and seed light is by multiple
Stimulated emission transition occurs for discrete appropriate wavelength combination, to realize the same of multiple wavelength seed laser powers into when incidence
Shi Fang great；
(2) the solar-pumped laser amplifier for being suitable for the amplification of multiple wavelength of the invention, in laser amplifier system,
Optically pumped laser operation material is pumped, the particle in operation material is made to transit to upper state from lower state, is i.e. pumping solar irradiation
Result in " population inversion "；Appropriate frequency photon (seed light) will promote the grain of high level on " reversion " operation material
Son drops to low-lying level and launches additional photon, forms light wave amplification；This amplifier can be applied to wavelength-division multiplex satellite
In optical communication system, there is the characteristics of raising dimensional energy transfer efficiency, the room for promotion rate of information throughput；
(3) the solar-pumped laser amplifier for being suitable for the amplification of multiple wavelength of the invention, this solar-pumped multi-wavelength
Optical fiber laser amplifier can be applied in space laser wavelength division multiplexing communications systems, have integrated level height, spatial volume small, energy
Measure the features such as utilization efficiency is high.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is space solar-pumped multi-wavelength optical fiber laser amplifier configurations schematic diagram.
Wherein, corresponding appended drawing reference in figure are as follows: 1- mixes ytterbium (Yb3+) fiber work substance, 2- optical fiber incidence end mouth, 3- light
Fine exit ports, 4- pump sunlight, and 5- multi-wavelength seed laser, wherein corresponding wavelength value 5 (a) is 1030nm, and 5 (b) are
1039nm, 5 (c) be 1050nm, 5 (d) be 1052nm, 5 (e) be 1058nm, 5 (f) be 1064nm, 5 (g) be 1072nm, 5 (h)
For 1075nm.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention
Protection scope.
Embodiment
The embodiment of the invention provides a kind of solar-pumped laser amplifiers suitable for the amplification of multiple wavelength, including mix ytterbium
(Yb3+) fiber work substance, optical fiber incidence end mouth, fiber exit port, pumping sunlight and multi-wavelength seed laser,
The optical fiber incidence end mouth is located along the same line with fiber exit port, described to mix ytterbium (Yb3+) fiber work object
Matter is coiled into cyclic structure and is arranged between optical fiber incidence end mouth and fiber exit port, and the multi-wavelength seed laser is by different waves
Long multiple laser forms and is located at optical fiber incidence end mouth, and the pumping sunlight is arranged at optical fiber incidence end mouth and is located at
Above multi-wavelength seed laser,
It is described to mix ytterbium (Yb3+) fiber work substance, optical fiber incidence end mouth, fiber exit port, pumping sunlight and Duo Bo
Long seed laser matches work, and the multi-wavelength seed laser is enabled to complete to put while multiple and different wavelength lasers
Greatly.
Further, the space solar-pumped laser amplifier can carry out multiwavelength laser in 950-1075nm wave band
Amplification.
Correspondingly, the present invention also provides a kind of amplifications of solar-pumped laser amplifier suitable for the amplification of multiple wavelength
Method, which comprises the steps of:
Step 1, pumping sunlight is converged to through optical fiber incidence end mouth and mixes ytterbium (Yb3+) fiber work substance；
Step 2, it is coupled multi-wavelength seed laser to through optical fiber incidence end mouth using optical-fiber bundling means and mixes ytterbium (Yb3+) light
The fibre core of fine operation material, multi-wavelength seed laser are advanced in fibre core；
Step 3, the pump mode of amplifier system inner fiber operation material is cladding pumping, and the coating of optical fiber is the second packet
Layer, the first covering have the function of sunlight waveguide, and pumping sunlight is coupled directly to the first covering in optical fiber；
Step 4, after multi-wavelength seed laser economic cooperation beam, it is coupled into optical fiber doping Yb3+Fibre core.
Further, the step 1 is based on solar-pumped laser technology, when pumping sun optical power density reaches pumping
When threshold power density, ytterbium (Yb is mixed3+) particle realizes particle from low-lying level by pump transition to high level in fiber work substance
Number reversion.
Further, the step 2 is that multichannel different wave length seed laser coupled is entered 1 using optical-fiber bundling device to mix ytterbium
(Yb3+) fiber work substance.
Further, the step 4 is when multi-wavelength seed laser passes through the fiber work in population inversion state
When substance, force high level atomic transition to low-lying level, the energy production light radiation of release, the frequency of excited radiation light, phase,
Polarization state and the direction of propagation are identical as the frequency of incident seed light, phase, polarization state and the direction of propagation respectively.
In laser amplifier system, optically pumped laser operation material is pumped, makes particle in operation material from lower state
Upper state is transitted to, i.e. pumping solar irradiation results in " population inversion "；Appropriate frequency photon (seed light) is in " reversion
" particle of high level will be promoted to drop to low-lying level and launch additional photon on operation material, form light wave amplification.
Further, space multi-wavelength carrier wave light source is continuous laser, and a certain wavelength seed of optical fiber laser amplifier swashs
Gain of light formula can be expressed as follows:
Wherein, G is amplifier gain, PinTo input pump power, A is seed laser facula cross-sectional area, ISFor saturation
Light intensity, G0For small-signal gain,
Wherein, it is saturated light intensity ISIs defined as:
γ is the only reduces value of inverted population after single photon emission, and h is Planck's constant, and v is the frequency of light wave, σ
For stimulated emission cross section, τcFor fluorescence lifetime, laser gain medium mixes Yb3+Corresponding γ=1 of optical fiber, then have:
G0=exp (g0L) (3)
Under the conditions of input energy is lower, i.e. G0Pin< < PS, can approximation obtain:
G≈G0=exp (g0L) (4)
Wherein, g0For small signal gain coefficient, L is the length of optical-fiber laser gain media,
When system is in small-signal operation state, it is assumed that WPτc< < 1, then have:
g0=σ τcn0WP (5)
In formula, n0Indicate ground state population density, σ is stimulated emission cross section, τcFor fluorescence lifetime, WPFor pumping rate, then
n0WPIt indicates that unit time unit volume is transferred to the population of upper laser level from ground state level, then has:
n0WP=ηQn0W03 (6)
In formula, ηQFor quantum efficiency, W03For from ground state level to upper laser level transition probability,
In conjunction with link energy transfer efficiency each in solar-pumped fiber laser amplifier system, then have:
In formula, ηOVP、ηT、ηa、ηu、ηB、PabRespectively indicate spectra overlapping efficiency, efficiency of transmission, absorption efficiency, upper energy level effect
Rate, light beam overlap rate and extraction efficiency, PabExpression system receives sun optical power, vLIndicate Output of laser wavelength, h is Planck
Constant, v are the frequency of light wave, definition saturation light intensity IS, haveThen small signal gain coefficient g0For
It substitutes the above to formula (4), the gain G of available solar-pumped optical fiber laser amplifier
In conclusion the solar-pumped laser amplifier for being suitable for the amplification of multiple wavelength of the invention, fiber work substance
Fibre core doped with rare earth ion ytterbium (Yb3+), mix Yb3+Optical fiber has more apparent emission spectrum in 950nm-1075nm wave band.
Using this spectral characteristic, when fiber work substance is in population inversion state under the conditions of solar-pumped, and seed light is
By multiple discrete appropriate wavelength combinations into when incidence, stimulated emission transition occurs, to realize multiple wavelength seed laser function
Amplify while rate；In laser amplifier system, optically pumped laser operation material is pumped, makes particle in operation material from low
Energy state transitions pump solar irradiation and result in " population inversion " to upper state；Appropriate frequency photon (seed light) is " anti-
Turn " particle of high level will be promoted to drop to low-lying level and launch additional photon on operation material, form light wave amplification；
This amplifier can be applied in wavelength-division multiplex Intersatellite Optical Communication System, has and improves dimensional energy transfer efficiency, room for promotion
The characteristics of rate of information throughput；This solar-pumped multi-wavelength optical fiber laser amplifier can be applied to space laser wavelength-division multiplex
In communication system, there is the features such as integrated level is high, spatial volume is small, and energy utilization efficiency is high.
In the description of the present application, it is to be understood that term " on ", "front", "rear", "left", "right", " is erected at "lower"
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "top", "bottom", "inner", "outside" is orientation based on the figure or position
Relationship is set, description the application is merely for convenience of and simplifies description, rather than the device or element of indication or suggestion meaning are necessary
It with specific orientation, is constructed and operated in a specific orientation, therefore should not be understood as the limitation to the application.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (7)
1. a kind of solar-pumped laser amplifier suitable for the amplification of multiple wavelength, which is characterized in that including mixing ytterbium (Yb3+) optical fiber
Operation material (1), optical fiber incidence end mouth (2), fiber exit port (3), pumping sunlight (4) and multi-wavelength seed laser (5),
The optical fiber incidence end mouth (2) is located along the same line with the fiber exit port (3), described to mix ytterbium (Yb3+) optical fiber
Operation material (1) is coiled into cyclic structure and is arranged between the optical fiber incidence end mouth (2) and the fiber exit port (3), institute
Multi-wavelength seed laser (5) is stated to be formed by the multiple laser of different wave length and be located at the optical fiber incidence end mouth (2), the pump
Pu sunlight (4) is arranged at the optical fiber incidence end mouth (2) and is located above the multi-wavelength seed laser (5),
It is described to mix ytterbium (Yb3+) fiber work substance (1), the optical fiber incidence end mouth (2), the fiber exit port (3), described
Pumping sunlight (4) and the multi-wavelength seed laser (5) match work, so that the multi-wavelength seed laser (5) can
Complete amplification while multiple and different wavelength lasers.
2. the solar-pumped laser amplifier according to claim 1 suitable for the amplification of multiple wavelength, which is characterized in that institute
Multiwavelength laser can be amplified in 950-1075nm wave band by stating space solar-pumped laser amplifier.
3. a kind of amplification method of the solar-pumped laser amplifier suitable for the amplification of multiple wavelength, which is characterized in that including such as
Lower step:
Step 1, pumping sunlight is converged to through optical fiber incidence end mouth and mixes ytterbium (Yb3+) fiber work substance；
Step 2, it is coupled multi-wavelength seed laser to through optical fiber incidence end mouth using optical-fiber bundling means and mixes ytterbium (Yb3+) optical fiber work
Make the fibre core of substance, multi-wavelength seed laser is advanced in fibre core；
Step 3, the pump mode of amplifier system inner fiber operation material is cladding pumping, and the coating of optical fiber is the second covering,
First covering has the function of sunlight waveguide, and pumping sunlight is coupled directly to the first covering in optical fiber；
Step 4, after multi-wavelength seed laser economic cooperation beam, it is coupled into optical fiber doping Yb3+Fibre core.
4. the amplification method of the solar-pumped laser amplifier according to claim 3 suitable for the amplification of multiple wavelength,
It is characterized in that, the step 1 is based on solar-pumped laser technology, when pumping sun optical power density reaches Threshold pumped power
When density, ytterbium (Yb is mixed3+) particle realizes population inversion from low-lying level by pump transition to high level in fiber work substance.
5. the amplification method of the solar-pumped laser amplifier according to claim 3 suitable for the amplification of multiple wavelength,
It is characterized in that, the step 2 is that multichannel different wave length seed laser coupled is entered 1 using optical-fiber bundling device to mix ytterbium (Yb3+) light
Fine operation material.
6. the amplification method of the solar-pumped laser amplifier according to claim 3 suitable for the amplification of multiple wavelength,
It is characterized in that, when the step 4 is the fiber work substance when multi-wavelength seed laser by being in population inversion state, compels
Make high level atomic transition to low-lying level, the energy production light radiation of release, the frequency of excited radiation light, phase, polarization state and
The direction of propagation is identical as the frequency of incident seed light, phase, polarization state and the direction of propagation respectively.
7. the amplification method of the solar-pumped laser amplifier according to claim 3 suitable for the amplification of multiple wavelength,
It is characterized in that, space multi-wavelength carrier wave light source is continuous laser, and a certain wavelength seed laser gain of optical fiber laser amplifier is public
Formula can be expressed as follows:
Wherein, G is amplifier gain, PinTo input pump power, A is seed laser facula cross-sectional area, ISTo be saturated light intensity,
G0For small-signal gain,
Wherein, it is saturated light intensity ISIs defined as:
γ is the only reduces value of inverted population after single photon emission, and h is Planck's constant, and v is the frequency of light wave, σ be by
Swash emission cross section, τcFor fluorescence lifetime, laser gain medium mixes Yb3+Corresponding γ=1 of optical fiber, then have:
G0=exp (g0L) (3)
Under the conditions of input energy is lower, i.e. G0Pin< < PS, can approximation obtain:
G≈G0=exp (g0L) (4)
Wherein, g0For small signal gain coefficient, L is the length of optical-fiber laser gain media,
When system is in small-signal operation state, it is assumed that WPτc< < 1, then have:
g0=σ τcn0WP (5)
In formula, n0Indicate ground state population density, σ is stimulated emission cross section, τcFor fluorescence lifetime, WPFor pumping rate, then n0WP
It indicates that unit time unit volume is transferred to the population of upper laser level from ground state level, then has:
n0WP=ηQn0W03 (6)
In formula, ηQFor quantum efficiency, W03For from ground state level to upper laser level transition probability,
In conjunction with link energy transfer efficiency each in solar-pumped fiber laser amplifier system, then have:
In formula, ηOVP、ηT、ηa、ηu、ηB、PabRespectively indicate spectra overlapping efficiency, efficiency of transmission, absorption efficiency, upper level statistics,
Light beam overlaps rate and extraction efficiency, PabExpression system receives sun optical power, vLIndicate Output of laser wavelength, h is that Planck is normal
Number, v are the frequency of light wave, definition saturation light intensity IS, haveThen small signal gain coefficient g0For
It substitutes the above to formula (4), the gain G of available solar-pumped optical fiber laser amplifier
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910749288.5A CN110459943A (en) | 2019-08-14 | 2019-08-14 | Solar-pumped laser amplifier and its amplification method suitable for the amplification of multiple wavelength |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910749288.5A CN110459943A (en) | 2019-08-14 | 2019-08-14 | Solar-pumped laser amplifier and its amplification method suitable for the amplification of multiple wavelength |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111478175A (en) * | 2020-06-02 | 2020-07-31 | 福州市纳飞光电科技有限公司 | Laser energy amplifier |
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| CN111478175A (en) * | 2020-06-02 | 2020-07-31 | 福州市纳飞光电科技有限公司 | Laser energy amplifier |
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Application publication date: 20191115 |