CN110350392A - The changeable device of continuous and pulse based on stimulated Brillouin scattering, method - Google Patents
The changeable device of continuous and pulse based on stimulated Brillouin scattering, method Download PDFInfo
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- CN110350392A CN110350392A CN201910713730.9A CN201910713730A CN110350392A CN 110350392 A CN110350392 A CN 110350392A CN 201910713730 A CN201910713730 A CN 201910713730A CN 110350392 A CN110350392 A CN 110350392A
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- brillouin scattering
- stimulated brillouin
- optoisolator
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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
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
-
- 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
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
- H01S3/302—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in an optical fibre
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The changeable device of the continuous and pulse based on stimulated Brillouin scattering that the invention discloses a kind of, belongs to fiber laser technology field, including Optical Maser System, fiber coupler, fabry perot interferometer, optoisolator and laser state controller.Fabry perot interferometer is connected with the fiber coupler, when inverted population is in the intracavitary threshold values for running up to stimulated Brillouin scattering, intracavitary reversion particle decline simultaneously adjusts Q giant-pulse in intracavitary formation, so that the laser is launched stable Q impulse sequence by the interference effect of the fabry perot interferometer；Laser state controller is connected with the optoisolator；Wherein, the laser of laser state controller output pass sequentially through the optoisolator, fiber coupler enter it is described intracavitary, to break the gain balance between multistage stimulated Brillouin scattering laser, so that the laser exports continuous laser state.Invention achieves the complexities for the system that can reduce, and reduce the technical effect of cost.
Description
Technical field
The invention belongs to fiber laser technology field, in particular to a kind of continuous and arteries and veins based on stimulated Brillouin scattering
The changeable device of punching, method.
Background technique
Full-optical-fiber laser is since the advantages such as its system is simple, scalability is strong, lasing efficiency is high are at laser processing, material
The fields such as reason have a wide range of applications.Need continuous laser and pulse laser that can mutually convert in some specific areas.Such as in work
In industry, there is the demand of different laser states for different processing purposes, such as in removing surface, laser cladding, laser remolten
Deng generally using continuous laser, but the high-peak power of pulse laser is needed again in terms of laser cutting
The characteristics such as narrow spaces.
In existing fiber laser technology, two lasers, a continuous wave laser and an arteries and veins are usually used
Laser is rushed, completes target jointly using two lasers.Such as: when needing continuous laser, by continuous wave laser come
Continuous laser is provided；When needing pulse laser, pulse laser is provided by pulse laser.Swashed in this way by switching two
The working condition of light device, to provide continuous laser or pulse laser respectively.But target is completed jointly in two lasers
During, but also the complexity of system increases, higher cost.
In conclusion there is continuous lasers and pulse laser mutually to switch in existing fiber laser technology
The technical issues of Cheng Zhong, the complexity and higher cost of system.
Summary of the invention
The technical problem to be solved by the present invention is in existing fiber laser technology, there is continuous lasers and arteries and veins
In the mutual handoff procedure of impulse light, the technical issues of the complexity and higher cost of system.
In order to solve the above technical problems, the present invention provides a kind of, the continuous and pulse based on stimulated Brillouin scattering can be cut
The device changed, described device include: Optical Maser System, and the Optical Maser System includes: diode-end-pumped source；Wavelength-division is multiple
With device, the wavelength division multiplexer is connected with the diode-end-pumped source；Gain fibre, the gain fibre and the wave
Division multiplexer connection, so that described in pumping laser is transferred to by the diode-end-pumped source by the wavelength division multiplexer
Gain fibre；Fiber bragg grating, the fiber bragg grating are connected with the gain fibre, to provide Laser feedback；
Fiber coupler, the fiber coupler are connected with the wavelength division multiplexer；Fabry perot interferometer, the Fabry Perot
Interferometer is connected with the fiber coupler, to pass through the wavelength division multiplexer, the gain fibre, the optical fiber Bragg light
Grid, the fiber coupler and the fabry perot interferometer form a chamber, when inverted population accumulates in the cavity
To stimulated Brillouin scattering threshold values when, intracavitary reversion particle decline simultaneously in intracavitary is formationed tune Q giant-pulse, passes through the method cloth
In the interference effect of perot interferometer so that the laser is launched stable Q impulse sequence；Optoisolator, the optoisolator
It is connected with the fiber coupler；Laser state controller, the laser state controller are connected with the optoisolator；Its
In, the laser of laser state controller output passes sequentially through the optoisolator, fiber coupler enter it is described intracavitary, with
Break the gain balance between multistage stimulated Brillouin scattering laser, so that the laser exports continuous laser state.
Further, the model of the wavelength division multiplexer is tri- port wavelength division multiplexer of 980nm/1550nm.
Further, the length of the gain fibre is 10m, and the gain fibre is erbium-doped fiber.
Further, the central wavelength of the fiber bragg grating is 1550.86nm, and peak reflectivity is 99.86%,
The broadband 3dB is 1.67nm.
Further, the fabry perot interferometer includes: the end face of two optical patchcords, two optical patchcords
End face between distance values range be 0.005mm to 5mm.
Another aspect according to the present invention, the continuous and pulse based on stimulated Brillouin scattering that the present invention also provides a kind of
Changeable method is applied to the described in any item devices of claim 1-5, which comprises closes laser state control
Pumping laser is transmitted to gain fibre by wavelength division multiplexer, and provides Laser feedback by fiber bragg grating by device, when
Inverted population is adjusting Q pulse laser at the laser output of laser in the intracavitary threshold values for running up to stimulated Brillouin scattering
State；Open the laser state controller, the laser of the laser state controller by optoisolator, fiber coupler into
Enter it is described intracavitary, to break the gain balance between multistage stimulated Brillouin scattering laser, at the laser output of the laser
It is continuous laser state.
Further, the output wavelength of the laser state controller is 1550nm.
Further, the output peak power of the laser state controller is 175mW.
Further, the central wavelength of the optoisolator is 1550nm, and bandwidth is ± 20nm.
Further, the central wavelength of the fiber coupler is 1550nm, and coupled ratio is 5:95.
The utility model has the advantages that
The present invention provides a kind of device that the continuous and pulse based on stimulated Brillouin scattering is changeable, passes through laser system
Wavelength division multiplexer and diode-end-pumped source are connected with each other in system, and gain fibre is connected with wavelength division multiplexer, optical fiber Bradley
Lattice grating is connected with gain fibre.Meanwhile fiber coupler is connected with fabry perot interferometer, fiber coupler and wavelength-division are multiple
It is connected with device, optoisolator is connected with fiber coupler, and laser state controller is connected with optoisolator, to pass through wavelength-division multiplex
Device, gain fibre, fiber bragg grating, fiber coupler and fabry perot interferometer form a chamber, when reversion particle
Number in the intracavitary threshold values for running up to stimulated Brillouin scattering, simultaneously adjust in intracavitary formation by intracavitary inverted population avalanche type decline
Q giant-pulse makes the laser launch stable Q impulse sequence by the interference effect of fabry perot interferometer.In this way
When closing laser state controller, the laser of output Q-switched pulse condition；When opening laser state controller, output is continuous
The laser of state.And laser state controller output laser pass sequentially through optoisolator, fiber coupler enter it is intracavitary, with
Break the gain balance between multistage stimulated Brillouin scattering laser, so that laser exports continuous laser state.Then can
The mutual switching that continuous laser and pulse laser are realized in a laser, reduces the complexity of system, reduces cost.From
And reach the complexity for the system of can reduce, reduce the technical effect of cost.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects of the present invention, feature and advantage can
It is clearer and more comprehensible, the followings are specific embodiments of the present invention.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of changeable device of continuous and pulse based on stimulated Brillouin scattering provided in an embodiment of the present invention
Overall structure diagram；
Fig. 2 is a kind of changeable device of continuous and pulse based on stimulated Brillouin scattering provided in an embodiment of the present invention
The time-domain diagram of the continuous laser of output；
Fig. 3 is a kind of changeable device of continuous and pulse based on stimulated Brillouin scattering provided in an embodiment of the present invention
The time-domain diagram of the adjusting Q pulse laser of output；
Fig. 4 is a kind of changeable method of continuous and pulse based on stimulated Brillouin scattering provided in an embodiment of the present invention
Flow chart.
Specific embodiment
The changeable device of the continuous and pulse based on stimulated Brillouin scattering that the invention discloses a kind of, passes through laser
Wavelength division multiplexer 20 and diode-end-pumped source 10 are connected with each other in system, and gain fibre 30 and wavelength division multiplexer 20 connect
It connects, fiber bragg grating 40 and gain fibre 30 connect.Meanwhile fiber coupler 50 and fabry perot interferometer 60 connect
It connects, fiber coupler 50 and wavelength division multiplexer 20 connect, and optoisolator 70 and fiber coupler 50 connect, laser state controller
80 and optoisolator 70 connect, with pass through wavelength division multiplexer 20, gain fibre 30, fiber bragg grating 40, fiber coupler
50 and fabry perot interferometer 60 formed a chamber, when inverted population is in the intracavitary threshold values for running up to stimulated Brillouin scattering
When, intracavitary inverted population avalanche type decline simultaneously adjusts Q giant-pulse in intracavitary formation, passes through the dry of fabry perot interferometer 60
The effect of relating to makes the laser launch stable Q impulse sequence.It is output Q-switched in this way when closing laser state controller 80
The laser of pulse condition；When opening laser state controller 80, the laser of continuous state is exported.And laser state controller
80 output laser pass sequentially through optoisolator 70, fiber coupler 50 enter it is intracavitary, to break multistage stimulated Brillouin scattering
Gain balance between laser, so that laser exports continuous laser state.Then it can be realized in a laser continuous
The mutual switching of laser and pulse laser reduces the complexity of system, reduces cost.To reach answering for the system of can reduce
Miscellaneous degree reduces the technical effect of cost.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art's every other embodiment obtained belong to what the present invention protected
Range；Wherein "and/or" keyword involved in this implementation, indicate and or two kinds of situations, in other words, the present invention implement
A and/or B mentioned by example, illustrate two kinds of A and B, A or B situations, describe three kinds of states present in A and B, such as A and/or
B, indicate: only including A does not include B；Only including B does not include A；Including A and B.
Meanwhile in the embodiment of the present invention, when component is referred to as " being fixed on " another component, it can be directly at another
On component or there may also be components placed in the middle.When a component is considered as " connection " another component, it be can be directly
It is connected to another component or may be simultaneously present component placed in the middle.When a component is considered as " being set to " another group
Part, it, which can be, is set up directly on another component or may be simultaneously present component placed in the middle.Made in the embodiment of the present invention
Term "vertical", "horizontal", "left" and "right" and similar statement are merely for purposes of illustration, and are not intended to
The limitation present invention.
Embodiment one
Referring to Figure 1, Fig. 1 is that a kind of continuous and pulse based on stimulated Brillouin scattering provided in an embodiment of the present invention can
The overall structure diagram of the device of switching, the changeable device packet of the continuous and pulse based on stimulated Brillouin scattering
It includes: Optical Maser System, fiber coupler 50, fabry perot interferometer 60, optoisolator 70 and laser state controller 80.It is existing
Respectively to Optical Maser System, fiber coupler 50, fabry perot interferometer 60, optoisolator 70 and laser state controller 80
It carries out described further below:
For Optical Maser System:
Optical Maser System includes diode-end-pumped source 10, wavelength division multiplexer 20, gain fibre 30 and optical fiber Bradley
Lattice grating 40.Wavelength division multiplexer 20 and the diode-end-pumped source 10 connection；Gain fibre 30 and the wavelength-division multiplex
Device 20 connects, so that described in pumping laser is transferred to by the diode-end-pumped source 10 by the wavelength division multiplexer 20
Gain fibre 30；Fiber bragg grating 40 and the gain fibre 30 connect, to provide Laser feedback.Wherein, the wavelength-division
The model of multiplexer 20 is tri- port wavelength division multiplexer of 980nm/1550nm.The length of the gain fibre 30 is 10m, the increasing
Beneficial optical fiber 30 is erbium-doped fiber.The central wavelength of the fiber bragg grating 40 is 1550.86nm, and peak reflectivity is
The broadband 99.86%, 3dB is 1.67nm.
Continuing with referring to Fig. 1, stimulated Brillouin scattering is mainly since incident optical power is very high, by the electromagnetism of light wave generation
Flex effect evokes ultrasonic wave in substance, and incident light is generated by ultrasonic scatterer.Brillouin scattering is originating from laser electricity
The interaction of field and the acoustic wavefield in molecule or solid, that is, the interaction of photon and phonon, also known as phon scattering.By force
Incident laser field induces strong sound wave field, and a kind of nonlinear optical effects scattered by it in the medium.It is dissipated with spontaneous Brillouin
Difference is penetrated, the generation process of stimulated Brillouin scattering is: under the electric field action of laser, by electrostriction effect, making medium
The variation of generating period density and dielectric constant, acoustic wavefield of inducting, and lead to that coherent scattering occurs between incident light and acoustic wavefield
Process.When heavy pumping laser field injects medium, the electrostriction effect of light wave fields is started working, and makes certain states in medium
Acoustic frequency vibration (phonon) is greatly enhanced, and the acoustic wavefield enhanced enhances the scattering process to incident laser, sound in turn again
Wave field, laser wave field, laser scattering light wave fields exist simultaneously in the medium, be mutually coupled.When the intensity of incident laser reaches
After threshold value, so that acoustic wavefield and the humidification of scattering light wave fields in medium is compensated respective loss effect, generate induction acoustic wavefield
It is excited amplification or oscillation effect with Brillouin scattering light wave fields, scattering light has the stimulated emissions such as the small, line width of the angle of divergence
Characteristic, therefore referred to as stimulated Brillouin scattering.Pumping source 10 is that working-laser material is motivated, and particle will be activated from ground state pumping
To high level, to realize population inversion.According to the difference of operation material and laser operation condition.It can take and different swash
Encourage mode and exciting bank.It common are optical excitation (optical pumping), gas discharge excitation, chemical pumping, nuclear energy excitation.Optical fiber
Bragg grating 40 is to be acted on by the hot-working of ultraviolet light in the technology of photosensitive glass, cause have some special compositions
The refractive index of photosensitive glass permanently sexually revise, to form inner refractive index according to certain rules point inside photosensitive glass
Cloth.This holographic technology is exactly utilized, volume Bragg grating is fabricated to.Laser semiconductor state control signal source is
Output of laser wavelength is the semiconductor laser of 1550nm, the output highest function in laser semiconductor state control signal source
Rate is 175mW.
It should be noted that light state control signal source is first in close state, it is 1550nm, bandwidth by central wavelength
Numberical range be ± 20nm optoisolator 70, be coupled to the optical fiber coupling that central wavelength is 1550nm, coupled ratio is 5:95
Clutch 50, fiber coupler 50 are connected with Optical Maser System again.Optical Maser System uses highest pump power for cardiac wave in 600mW
The semiconductor laser of a length of 980nm, the wavelength-division multiplex that semiconductor laser 500mW laser passes through 980nm/1550nm
Device 20 inputs in the Er-doped fiber of 10m long.The central wavelength of fiber bragg grating 40 is 1550.86nm, and peak reflectivity is
99.86%, three dB bandwidth 1.67nm.The laser power that semiconductor laser is emitted is the semiconductor in pumping laser unit
0.1% or more of laser institute transmission power.Fiber bragg grating 40 is high reflectance grating.The Fabry Perot
Interferometer 60 be two wire jumpers not in contact with end face constitute, the end face spacing for adjusting wire jumper makes laser launch stable tune Q
Pulse laser.Fig. 2 is referred to, Fig. 2 is a kind of continuous and pulse based on stimulated Brillouin scattering provided in an embodiment of the present invention
The time-domain diagram of the continuous laser of changeable device output, the laser output condition of the system is adjusting Q pulse laser at this time.It please join
See that Fig. 3, Fig. 3 are that a kind of changeable device of continuous and pulse based on stimulated Brillouin scattering provided in an embodiment of the present invention is defeated
The time-domain diagram of adjusting Q pulse laser out opens semiconductor laser, and output power is transferred to 10mW, and whole system output is continuous to swash
Light.
For fiber coupler 50 and fabry perot interferometer 60:
Fiber coupler 50 and the wavelength division multiplexer 20 connect；The fabry perot interferometer 60 and the optical fiber coupling
Clutch 50 connects, to pass through the wavelength division multiplexer 20, the gain fibre 30, the fiber bragg grating 40, the light
Fine coupler 50 and the fabry perot interferometer 60 form a chamber, are excited when inverted population is run up in the cavity
When the threshold values of Brillouin scattering, intracavitary reversion particle decline simultaneously adjusts Q giant-pulse in intracavitary formation, passes through the Fabry Perot
The interference effect of interferometer 60 makes the laser launch stable Q impulse sequence.Wherein, the fabry perot interferometer
60 include: the end face of two optical patchcords, the distance values range between the end face of two optical patchcords be 0.005mm extremely
5mm。
Continuing with referring to Fig. 1, fiber coupler is also known as splitter, connector, adapter, end optical fiber flange plate, is for real
Existing optical signal branch/combining, or for the element of extended fiber link, belong to light passive device field.Fabry Perot interference
Instrument 60 is a kind of multi-beam interferometer being made of two pieces of parallel glass plates, wherein two pieces of opposite inner surfaces of glass plate all have
There is high reflectance.Fiber coupler 50 is used as interface unit.Fiber coupler 50 and fabry perot interferometer 60 connect, described
The coupling bandwidth of fiber coupler 50 includes the laser that laser semiconductor state control signal source is emitted, and
The bandwidth and the gain bandwidth of gain media (gain fibre 30 is as gain media) are mutually matched, the strap of fiber coupler
Wide and gain bandwidth, which matches, refers to that the laser that laser state controller 80 exports should be close to the light for adjusting lower the emitted laser of Q state
The center (such as 1550nm) of spectral limit.The coupled ratio of fiber coupler 50 can not influence laser performance of the present invention
In the case of arbitrarily change.The double bounce line end interplanar distance of fabry perot interferometer 60 is between 0.005mm to 5mm.Fabry amber
The idle end fiber end face of Luo Gan's interferometer 60 is cut into output end of the oblique angle as laser.
For laser state controller 80 and optoisolator 70:
Optoisolator 70 and the fiber coupler 50 connect；The laser state controller 80 and the optoisolator 70
Connection.Wherein, the laser that the laser state controller 80 exports pass sequentially through the optoisolator 70, fiber coupler 50 into
Enter it is described intracavitary, to break the gain balance between multistage stimulated Brillouin scattering laser, so that laser output is continuous
Laser state.
Continuing with referring to Fig. 1, optoisolator 70 is a kind of Passive Optical Components for only Unidirectional light being allowed to pass through, optoisolator 70
Working principle be the nonreciprocity based on Faraday rotation.It can be fine by optoisolator 70 by the light of optical fiber echo reflection
Isolation, optoisolator 70 mainly utilize magneto-optical crystal Faraday effect, the characteristic of optoisolator 70 is: positive insertion loss
Low, reverse isolation degree is high, and return loss is high.Optoisolator 70 is that light is allowed to lead to round about to a direction by preventing
The passive device crossed, effect are limited the direction of light, make light can only one direction transmission, pass through the light of optical fiber echo reflection
It can be isolated well by optoisolator 70, improve light wave transmissions efficiency.Optoisolator 70 is as sharp in protection device separate cavities
Light.Laser state controller 80 refers to laser semiconductor state control signal source.Laser semiconductor control letter
Number source is in close state.Pumping laser is transferred to gain fibre by wavelength division multiplexer 20 by diode-end-pumped source 10
30, fiber bragg grating 40 provides Laser feedback, and fabry perot interferometer 60 inverts particle due to loss with higher
Number is in intracavitary accumulation, and when having reached the threshold value of stimulated Brillouin scattering, intracavitary inverted population avalanche type declines and in chamber
Q giant-pulse is adjusted in interior formation.The laser is set to launch stable Q impulse by the interference effect of fabry perot interferometer 60
Sequence.The laser output of laser is in adjusting Q pulse laser state at this time.Open laser semiconductor state control signal
Source, the wavelength laser enter intracavitary, the gain between multistage stimulated Brillouin scattering laser by optoisolator 70 and coupler
Balance is broken, and stablizing in laser adjusts Q state to be broken.Entire laser loses tune Q state, and injection laser is amplified,
The laser switchs to continuous impulse laser.At this point, the laser output of laser is in continuous laser state.
It should be noted that a kind of continuous and pulse based on stimulated Brillouin scattering provided in an embodiment of the present invention can be cut
The device changed is not necessarily to any active modulated media or additional electric control system intracavitary.It is just able to achieve using optical signal sharp
Light device is continuous/instantaneous transition of pulse condition.Concrete principle are as follows: by steady running based on stimulated Brillouin scattering
The laser of injection specific wavelength can generate interference to operating condition in the Q adjusting optical fiber laser of scattering, by change because by
The equilibrium state of laser is broken in the gain of multistage stokes light for swashing Brillouin scattering and exciting, to destroy laser
The light of normal q-operation, the specific wavelength of injection is amplified, and is changed into the output laser state of laser from Q impulse state
Continuous laser state, the laser for stopping input specific wavelength can be such that the tune Q state of laser restores, and the laser can lead to
The injection of fiber coupler 50 is crossed, to realize the control to Q-switched pulse laser output state of all-fiber.
The present invention provides a kind of device that the continuous and pulse based on stimulated Brillouin scattering is changeable, passes through laser system
Wavelength division multiplexer 20 and diode-end-pumped source 10 are connected with each other in system, and gain fibre 30 and wavelength division multiplexer 20 connect,
Fiber bragg grating 40 and gain fibre 30 connect.Meanwhile fiber coupler 50 and fabry perot interferometer 60 connect, light
Fine coupler 50 and wavelength division multiplexer 20 connect, and optoisolator 70 and fiber coupler 50 connect, 80 He of laser state controller
Optoisolator 70 connects, to pass through wavelength division multiplexer 20, gain fibre 30, fiber bragg grating 40,50 and of fiber coupler
Fabry perot interferometer 60 forms a chamber, when inverted population is in the intracavitary threshold values for running up to stimulated Brillouin scattering,
Intracavitary inverted population avalanche type decline simultaneously adjusts Q giant-pulse in intracavitary formation, passes through the interference of fabry perot interferometer 60
Effect makes the laser launch stable Q impulse sequence.In this way when closing laser state controller 80, output Q-switched arteries and veins
Rush the laser of state；When opening laser state controller 80, the laser of continuous state is exported.And laser state controller 80
The laser of output pass sequentially through optoisolator 70, fiber coupler 50 enter it is intracavitary, with break multistage stimulated Brillouin scattering swash
Gain balance between light, so that laser exports continuous laser state.Then it can be realized in a laser continuous sharp
The mutual switching of light and pulse laser reduces the complexity of system, reduces cost.To reach the complexity for the system of can reduce
Degree, reduces the technical effect of cost.
Based on the same inventive concept, this application provides be based on stimulated Brillouin scattering with one kind corresponding to embodiment one
The method that can be switched of continuous and pulse, detailed in Example two.
Embodiment two
As shown in figure 4, Fig. 4 is that a kind of continuous and pulse based on stimulated Brillouin scattering provided in an embodiment of the present invention can
The method flow diagram of switching.The continuous and pulse based on stimulated Brillouin scattering that second embodiment of the present invention provides a kind of is changeable
Method, which comprises
Step S100 closes laser state controller 80, and pumping laser is transmitted to gain light by wavelength division multiplexer 20
Fibre 30, and Laser feedback is provided by fiber bragg grating 40, when inverted population is dissipated in the intracavitary excited Brillouin that runs up to
It is adjusting Q pulse laser state at the laser output of laser when the threshold values penetrated.Wherein, the laser state controller 80 is defeated
Wavelength is 1550nm out.The output peak power of the laser state controller 80 is 175mW.
Specifically, light state control signal source is first set to off closed state first, by being by central wavelength
1550nm, bandwidth numberical range be the optoisolator 70 of ± 20nm and central wavelength be 1550nm, coupled ratio 5:95
Fiber coupler 50, fiber coupler 50 again with Optical Maser System be connected with each other.Optical Maser System uses highest pump power
The semiconductor laser for being 980nm for 600mW central wavelength, semiconductor laser 500mW laser pass through 980nm/
The wavelength division multiplexer 20 of 1550nm inputs in the Er-doped fiber of 10m long.The central wavelength of fiber bragg grating 40 is
1550.86nm, peak reflectivity 99.86%, three dB bandwidth 1.67nm.The laser power that semiconductor laser is emitted is
0.1% or more of semiconductor laser institute transmission power in pumping laser unit.Fiber bragg grating 40 is high reflection
Rate grating.The fabry perot interferometer 60 be two wire jumpers not in contact with end face constitute, adjust the end face spacing of wire jumper
Laser is set to launch stable adjusting Q pulse laser.In this way when closing laser state controller 80, what is launched is stable
Adjusting Q pulse laser.
Step S110, opens the laser state controller 80, the laser of the laser state controller 80 by light every
It is described intracavitary from device 70, the entrance of fiber coupler 50, to break the gain balance between multistage stimulated Brillouin scattering laser, institute
Stating at the laser output of laser is continuous laser state.Wherein, the central wavelength of the optoisolator 70 is 1550nm, bandwidth
It is ± 20nm.The central wavelength of the fiber coupler 50 is 1550nm, and coupled ratio is 5:95.
Continuing with referring to fig. 4, laser state controller 80 refers to laser semiconductor state control signal source.In reality
In the operation of border, the Output of laser wavelength of semiconductor laser is the semiconductor laser of 1550nm, and output peak power is
175mW.After semiconductor laser is first in close state, i.e., by central wavelength be 1550nm, bandwidth ± 20nm light every
Be connected to the fiber coupler 50 that central wavelength is 1550nm, coupled ratio is 5:95 from device 70, fiber coupler 50 again with laser
Device system is connected.Optical Maser System uses the semiconductor laser that highest pump power is 980nm for 600mW central wavelength, should
Semiconductor laser 500mW laser is inputted in the Er-doped fiber of 10m long by the wavelength division multiplexer 20 of 980nm/1550nm.
The central wavelength of fiber bragg grating 40 is 1550.86nm, peak reflectivity 99.86%, three dB bandwidth 1.67nm.Institute
The fabry perot interferometer 60 stated be two wire jumpers not in contact with end face constitute, the end face spacing for adjusting wire jumper sends out laser
Project stable adjusting Q pulse laser.The laser output condition of the system is adjusting Q pulse laser at this time.Then semiconductor is opened again
Laser, output power are transferred to 10mW, that is, pass through the tune Q optical fiber based on stimulated Brillouin scattering scattering in a steady running
The laser of injection specific wavelength to generate operating condition interference in laser, then by changing because of stimulated Brillouin scattering
The equilibrium state of laser is broken in the gain of the multistage stokes light of excitation, to destroy the normal q-operation of laser, infuses
The light of the specific wavelength entered is amplified, and so that the output laser state of laser is changed into continuous laser state from Q impulse state, is stopped
The laser for only inputting specific wavelength can be such that the tune Q state of laser restores, and the laser can pass through fiber coupler 50
Injection, to realize the control to Q-switched pulse laser output state of all-fiber.
The present invention provides a kind of method that the continuous and pulse based on stimulated Brillouin scattering is changeable, by closing laser
Pumping laser is transmitted to gain fibre 30 by wavelength division multiplexer 20, and passes through fiber bragg grating by state controller 80
40 provide Laser feedback, and when inverted population is in the intracavitary threshold values for running up to stimulated Brillouin scattering, the laser of laser is defeated
Source is adjusting Q pulse laser state；It is then turned on the laser state controller 80, the laser of the laser state controller 80 is logical
Cross optoisolator 70, fiber coupler 50 enter it is described intracavitary, to break the gain between multistage stimulated Brillouin scattering laser
It balances, is continuous laser state at the laser output of the laser.In this way when closing laser state controller 80, output is adjusted
The laser of Q pulse condition；When opening laser state controller 80, the laser of continuous state is exported.And laser state controls
Device 80 export laser pass sequentially through optoisolator 70, fiber coupler 50 enter it is intracavitary, with break multistage excited Brillouin dissipate
The gain balance between laser is penetrated, so that laser exports continuous laser state.Then can in a laser company of realization
The mutual switching of continuous laser and pulse laser, reduces the complexity of system, reduces cost.To reach the system of can reduce
Complexity reduces the technical effect of cost.
It should be noted last that the above specific embodiment is only used to illustrate the technical scheme of the present invention and not to limit it,
Although being described the invention in detail referring to example, those skilled in the art should understand that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit and scope of the technical solution of the present invention, should all cover
In the scope of the claims of the present invention.
Claims (10)
1. a kind of changeable device of continuous and pulse based on stimulated Brillouin scattering, which is characterized in that described device includes:
Optical Maser System, the Optical Maser System include:
Diode-end-pumped source；
Wavelength division multiplexer, the wavelength division multiplexer are connected with the diode-end-pumped source；
Gain fibre, the gain fibre are connected with the wavelength division multiplexer, so that the diode-end-pumped source passes through
Pumping laser is transferred to the gain fibre by the wavelength division multiplexer；
Fiber bragg grating, the fiber bragg grating are connected with the gain fibre, to provide Laser feedback；
Fiber coupler, the fiber coupler are connected with the wavelength division multiplexer；
Fabry perot interferometer, the fabry perot interferometer are connected with the fiber coupler, to pass through the wavelength-division
Multiplexer, the gain fibre, the fiber bragg grating, the fiber coupler and the fabry perot interferometer shape
At a chamber, when inverted population runs up to the threshold values of stimulated Brillouin scattering in the cavity, under intracavitary reversion particle
It drops and adjusts Q giant-pulse in intracavitary formation, launch the laser surely by the interference effect of the fabry perot interferometer
Fixed Q impulse sequence；
Optoisolator, the optoisolator are connected with the fiber coupler；
Laser state controller, the laser state controller are connected with the optoisolator；Wherein, the laser state control
Device output laser pass sequentially through the optoisolator, fiber coupler enter it is described intracavitary, to break multistage excited Brillouin
Gain balance between scattering laser, so that the laser exports continuous laser state.
2. the changeable device of the continuous and pulse based on stimulated Brillouin scattering as described in claim 1, it is characterised in that:
The model of the wavelength division multiplexer is tri- port wavelength division multiplexer of 980nm/1550nm.
3. the changeable device of the continuous and pulse based on stimulated Brillouin scattering as claimed in claim 2, it is characterised in that:
The length of the gain fibre is 10m, and the gain fibre is erbium-doped fiber.
4. the changeable device of the continuous and pulse based on stimulated Brillouin scattering as claimed in claim 3, it is characterised in that:
The central wavelength of the fiber bragg grating is 1550.86nm, and peak reflectivity is that the broadband 99.86%, 3dB is
1.67nm。
5. the changeable device of the continuous and pulse based on stimulated Brillouin scattering as claimed in claim 4, it is characterised in that:
The fabry perot interferometer includes: the end face of two optical patchcords, between the end face of two optical patchcords
Distance values range is 0.005mm to 5mm.
6. a kind of changeable method of continuous and pulse based on stimulated Brillouin scattering, is applied to any one of claim 1-5
The device, which is characterized in that the described method includes:
Laser state controller is closed, pumping laser is transmitted to gain fibre by wavelength division multiplexer, and pass through optical fiber Bradley
Lattice grating provides Laser feedback, and when inverted population is in the intracavitary threshold values for running up to stimulated Brillouin scattering, laser swashs
It is adjusting Q pulse laser state at light output；
Open the laser state controller, the laser of the laser state controller by optoisolator, fiber coupler into
Enter it is described intracavitary, to break the gain balance between multistage stimulated Brillouin scattering laser, at the laser output of the laser
It is continuous laser state.
7. the changeable method of the continuous and pulse based on stimulated Brillouin scattering as claimed in claim 6, it is characterised in that:
The output wavelength of the laser state controller is 1550nm.
8. the changeable method of the continuous and pulse based on stimulated Brillouin scattering as claimed in claim 7, it is characterised in that:
The output peak power of the laser state controller is 175mW.
9. the changeable method of the continuous and pulse based on stimulated Brillouin scattering as claimed in claim 8, it is characterised in that:
The central wavelength of the optoisolator is 1550nm, and bandwidth is ± 20nm.
10. the changeable method of the continuous and pulse based on stimulated Brillouin scattering, feature exist as claimed in claim 9
In:
The central wavelength of the fiber coupler is 1550nm, and coupled ratio is 5:95.
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