CN106099635A - The 2 mu m waveband linear polarization single frequency optical fiber lasers with power feedback mechanism - Google Patents
The 2 mu m waveband linear polarization single frequency optical fiber lasers with power feedback mechanism Download PDFInfo
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- CN106099635A CN106099635A CN201610776007.1A CN201610776007A CN106099635A CN 106099635 A CN106099635 A CN 106099635A CN 201610776007 A CN201610776007 A CN 201610776007A CN 106099635 A CN106099635 A CN 106099635A
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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
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1305—Feedback control systems
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
Abstract
The present invention is the 2 mu m waveband linear polarization single frequency optical fiber lasers with power feedback mechanism, comprises king oiscillator, prime amplifier, power amplifier and laser delivery, and king oiscillator is to work in the single-frequency semiconductor laser of 2 mu m wavebands；Prime amplifier includes the first optical-fiber bundling device, first fibre optic isolater, first multiple die semiconductor laser pump (ing) and the first double clad thulium doped fiber, power amplifier includes the second optical-fiber bundling device, second fibre optic isolater, second double clad thulium doped fiber, fiber optic splitter, second multiple die semiconductor laser pump (ing) and feedback unit composition, the outfan of king oiscillator and the signal end of the first optical-fiber bundling device connect, the signal end of the first fibre optic isolater outfan and the second optical-fiber bundling device connects, the Output of laser of power amplifier exports through laser delivery, feedback laser connects with feedback unit input, feedback unit outfan and the second multiple die semiconductor laser pump (ing) connect, there is stability high, without advantages such as mode hoppings.
Description
Technical field
The present invention relates to optical fiber and laser technology field, a kind of 2 mu m wavebands with power feedback mechanism
Linear polarization single frequency optical fiber laser.
Background technology
Fiber laser/amplifier is the laser/amplifier with the optical fiber of doped with rare-earth elements as gain media, passes through
Adulterate different rare earth elements, such as bait (Er), and an an ancient unit of weight equal to 20 or 24 *taels of silver (Yb), thulium (Tm), holmium (Ho), neodymium (Nd) etc., fiber laser/amplifier
Service band covers from ultraviolet to mid-infrared.Compared with other laser/amplifiers, fiber laser/amplifier has energy
Amount conversion ratio is high, output beam quality is good, compact conformation is stable, without light path adjustments, perfect heat-dissipating, life-span length and without tieing up
The distinguishing feature such as protect, be therefore rapidly developed and apply widely.
It is good that single frequency optical fiber laser has monochromaticity, the excellent outstanding speciality of coherence, can be widely applied to quantum communications, phase
The high-end applications such as dry detection, but single-frequency laser is had higher requirement by these high-end applications fields: in difference
Ambient temperature under, the output of single-frequency laser to keep stable, and at such as 0 DEG C-30 DEG C, power instability to keep
Below 3%.Existing single-frequency laser power instability at 0 DEG C-30 DEG C, substantially more than 25%, is difficult to lead at quantum
Letter, the high-end field such as coherent detection has been applied.
Summary of the invention
In order to solve deficiency of the prior art, it is desirable to provide a kind of stability is high, power is strong, without the band of mode hopping
There are 2 mu m waveband linear polarization single frequency optical fiber lasers of power feedback mechanism.
In order to realize above-mentioned functions, the present invention will take techniques below scheme:
A kind of 2 mu m waveband linear polarization single frequency optical fiber lasers with power feedback mechanism, including king oiscillator, prime amplifier,
Power amplifier and laser delivery with power feedback mechanism, it is characterised in that
King oiscillator is to work in the single-frequency semiconductor laser of 2 mu m wavebands；Prime amplifier is by the first optical-fiber bundling device, the first light
Fiber isolator, the first multiple die semiconductor laser pump (ing) and the first double clad thulium doped fiber composition, prime amplifier (2) is not limited to one
Level fiber amplifier level, can increase fiber amplifier level to realize the laser of more power, and prime amplifier can be forward pumping, also
It can be backward pump.When prime amplifier is forward pumping, the outfan of king oiscillator closes with the first optical fiber of prime amplifier
The signal end of bundle device connects, and pumping end and the first multiple die semiconductor laser pump (ing) of the first optical-fiber bundling device connect, the first optical fiber
Outfan and first double clad thulium doped fiber one end of bundling device connect, the first double clad thulium doped fiber other end and the first optical fiber
Isolator connects；The Output of laser of power amplifier exports through laser delivery；When prime amplifier is backward pump, main oscillations
Outfan and first double clad thulium doped fiber one end other end of device connect, first double clad thulium doped fiber one end and the first optical fiber
Closing number device signal end to be connected, pumping end and the first multiple die semiconductor laser pump (ing) of the first optical-fiber bundling device connect, the first optical fiber
Outfan and first fibre optic isolater of bundling device connect.Additionally, power amplifier can be forward pumping, it is also possible to for backward
Pumping, when power amplifier is forward pumping, power amplifier by the second optical-fiber bundling device, the second fibre optic isolater, second
Double clad thulium doped fiber, fiber optic splitter, the second multiple die semiconductor laser pump (ing) and feedback unit composition, the first of prime amplifier
Fibre optic isolater outfan connects with the signal end of the second optical-fiber bundling device of power amplifier, the output of the second optical-fiber bundling device
End connects with second double clad thulium doped fiber one end, and the second double clad thulium doped fiber other end and the second fibre optic isolater connect,
The outfan of the second fibre optic isolater is connected with the input of fiber optic splitter, fiber optic splitter laser is divided into Output of laser and
The power ratio of feedback laser, Output of laser and feedback laser is not less than 99:1, and Output of laser exports through laser delivery, feedback
Laser connects with feedback unit input, and feedback unit outfan and the second multiple die semiconductor laser pump (ing) connect；When power is put
When big device is backward pump, power amplifier is mixed thulium light by the second optical-fiber bundling device, the second fibre optic isolater, the second double clad
Fibre, fiber optic splitter, the second multiple die semiconductor laser pump (ing) and feedback unit composition, the first fibre optic isolater of prime amplifier is defeated
Going out end to connect with the second double clad thulium doped fiber of power amplifier, the second double clad thulium doped fiber other end and the second optical fiber close
Bundle device signal end connect, another signal end and second fibre optic isolater of the second optical-fiber bundling device connect, the second optical fiber every
Being connected with the input of fiber optic splitter from device outfan, laser is divided into Output of laser and feedback laser by fiber optic splitter, defeated
The power ratio going out laser and feedback laser exports through laser delivery not less than 99:1, Output of laser, feedback laser and feedback
Unit input connects, and feedback unit outfan and the second multiple die semiconductor laser pump (ing) connect.
Feedback unit of the present invention include photodetector, photodetection circuit module, Feedback of Power main control module and
Pump driver, feedback laser is coupled into photodetector by optical fiber, and photodetection circuit module accepts photodetector
The signal of telecommunication of output also inputs to Feedback of Power main control module, Feedback of Power master control module controls pump driver after processing
Export corresponding electric current to drive the second multiple die semiconductor laser pump (ing).
King oiscillator of the present invention include the 3rd semiconductor laser drive, 2 mu m waveband single-frequency semiconductor lasers and
3rd fibre optic isolater, wherein the 3rd semiconductor laser drive drives 2 mu m waveband single-frequency quasiconductors of an optical fiber coupling to swash
Light device (6) Output of laser, the output optical fibre of single-frequency semiconductor laser and the input optical fibre welding of the 3rd fibre optic isolater (7-1)
Together, the input of the 3rd fibre optic isolater (7-1) and the signal end of the first optical-fiber bundling device are connected.
The 2 mu m waveband single-frequency semiconductor laser wavelengths that work in of the present invention are positioned at 1850nm-2050nm, and single-frequency is partly led
The coupling optical fiber of body laser is polarization maintaining optical fibre, to export continuous, single longitudinal mode, linearly polarized laser by optical fiber.
First optical-fiber bundling device of the present invention is (1+1) × 1 optical-fiber bundling device.
Second optical-fiber bundling device is (2+1) × 1 optical-fiber bundling device, it is also possible to for (6+1) × 1 optical-fiber bundling device or (18+1)
× 1 optical-fiber bundling device.
Laser is divided into Output of laser and feedback laser, Output of laser and feedback laser by fiber optic splitter of the present invention
Power ratio is preferably 99.5:0.5.
First double clad thulium doped fiber of the present invention, the second double clad thulium doped fiber, the first fibre optic isolater, the second optical fiber every
It is the inclined device of guarantor, to realize polarized light from device, the 3rd fibre optic isolater, laser delivery.
First double clad thulium doped fiber of the present invention, the core diameter/inner cladding of the second double clad thulium doped fiber be 10 μm/
130 μm, fibre core NA is 0.15, and the absorptance of laser at 793nm is about 4.7dB/m.
First multiple die semiconductor laser pump (ing) of the present invention is optical fiber coupling multimode semiconductor laser, operation wavelength position
In 793nm, output optical fibre is 105 μm/125 μm optical fiber, and fibre core NA is 0.22, output about 4W；Second multiple die semiconductor swashs
Optical pumping is optical fiber coupling multimode semiconductor laser, and operation wavelength is positioned at 793nm, and output optical fibre is 105 μm/125 μm optical fiber,
Fibre core NA is 0.22, output about 8W.
The present invention is used as seed source with 2 mu m waveband single-frequency semiconductor lasers, utilizes fiber amplifier level by effective for its power
Amplify, it is achieved that high-power single-frequency laser, by adding feedback mechanism at power-amplifier stage, it is ensured that laser instrument output work
The stability of rate, make the present invention 0 DEG C of-40 DEG C of operated within range in single longitudinal mode state and instability be held in 3% with
Under.Owing to using said structure, the present invention has that stability is high, power strong, without advantages such as mode hoppings.
Accompanying drawing explanation
Fig. 1 is a kind of structure chart diagram of the present invention.
Fig. 2 is the another kind of structural representation of the present invention.
Labelling in figure:
King oiscillator 1, prime amplifier 2, the power amplifier 3 with power feedback mechanism, laser delivery the 4, the 3rd quasiconductor
Laser driver 5,2 mu m waveband single-frequency semiconductor laser the 6, the 3rd fibre optic isolater the 7, first optical-fiber bundling device the 9, first optical fiber
Isolator the 10, first multiple die semiconductor laser pump (ing) 8 and first double clad thulium doped fiber the 11, second optical-fiber bundling device 12, second
Fibre optic isolater the 13, second double clad thulium doped fiber 14, fiber optic splitter the 15, second multiple die semiconductor laser pump (ing) 16, photoelectricity
Detector 17, photodetection circuit module 18, Feedback of Power main control module 19, pump driver 20.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further illustrated:
As it can be seen, a kind of 2 mu m waveband linear polarization single frequency optical fiber lasers with power feedback mechanism, including king oiscillator 1,
Prime amplifier 2, with the power amplifier 3 of power feedback mechanism and laser delivery 4.
King oiscillator 1 is to work in the single-frequency semiconductor laser of 2 mu m wavebands, works in 2 mu m waveband single-frequency quasiconductors and swashs
Light device wavelength is positioned at 1850nm-2050nm, and the coupling optical fiber of single-frequency semiconductor laser is polarization maintaining optical fibre, to be exported by optical fiber
Continuous, single longitudinal mode, linearly polarized laser, king oiscillator includes the 3rd semiconductor laser drive 5,2 mu m waveband single-frequency quasiconductor
Laser instrument 6 and the 3rd fibre optic isolater 7, wherein the 3rd semiconductor laser drive 5 drives 2 mu m waveband lists of an optical fiber coupling
Frequently semiconductor laser 6 Output of laser, the output optical fibre of single-frequency semiconductor laser 6 and the input light of the 3rd fibre optic isolater 7
Fibre welds together.
Prime amplifier is by first optical-fiber bundling device the 9, first fibre optic isolater the 10, first multiple die semiconductor laser pump (ing) 8 and
First double clad thulium doped fiber 11 forms, and wherein, the first multiple die semiconductor laser pump (ing) 8 is optical fiber coupling multimode semiconductor laser
Device, operation wavelength is positioned at 793nm, and output optical fibre is 105 μm/125 μm optical fiber, and fibre core NA is 0.22, output about 4W；First
Optical-fiber bundling device 9 is (1+1) × 1 optical-fiber bundling device, and prime amplifier (2) is not limited to one-level fiber amplifier level, can increase light
Fine amplifier stage is to realize the laser of more power, and prime amplifier can be forward pumping, it is also possible to for backward pump.Work as pre-amplification
When device is forward pumping, the outfan of king oiscillator connects with the signal end of the first optical-fiber bundling device of prime amplifier, the first light
Pumping end and the first multiple die semiconductor laser pump (ing) of fine bundling device connect, the outfan of the first optical-fiber bundling device and the first double-contracting
Layer thulium doped fiber one end connects, and the first double clad thulium doped fiber other end and the first fibre optic isolater connect；Power amplifier
Output of laser exports through laser delivery；When prime amplifier is backward pump, the outfan of king oiscillator and the first double clad
Thulium doped fiber one end other end connects, and first double clad thulium doped fiber one end is closed number device signal end with the first optical fiber and is connected, and first
Pumping end and the first multiple die semiconductor laser pump (ing) of optical-fiber bundling device connect, the outfan of the first optical-fiber bundling device and the first light
Fiber isolator connects.
Power amplifier is by second optical-fiber bundling device the 12, second fibre optic isolater the 13, second double clad thulium doped fiber 14, light
Fine beam splitter the 15, second multiple die semiconductor laser pump (ing) 16 and feedback unit composition.Wherein, the second multiple die semiconductor laser pump (ing)
For optical fiber coupling multimode semiconductor laser, operation wavelength is positioned at 793nm, and output optical fibre is 105 μm/125 μm optical fiber, fibre core NA
It is 0.22, output about 8W；Second optical-fiber bundling device is (2+1) × 1 optical-fiber bundling device, it is also possible to for ((6+1) × 1 optical fiber
Bundling device or (18+1) × 1 optical-fiber bundling device.Power amplifier can be forward pumping, it is also possible to for pumping backward, work as power
When amplifier is forward pumping, the first fibre optic isolater outfan of prime amplifier and the second optical-fiber bundling device of power amplifier
Signal end connect, outfan and second double clad thulium doped fiber one end of the second optical-fiber bundling device connect, and the second double clad is mixed
The thulium optical fiber other end and the second fibre optic isolater connect, the input phase of the outfan of the second fibre optic isolater and fiber optic splitter
Even, laser is divided into the power ratio of Output of laser and feedback laser, Output of laser and feedback laser to be not less than by fiber optic splitter
The power ratio of 99:1, Output of laser and feedback laser is preferably 99.5:0.5, and Output of laser exports through laser delivery, feedback
Laser connects with feedback unit input, and feedback unit outfan and the second multiple die semiconductor laser pump (ing) connect；When power is put
When big device is backward pump, power amplifier is mixed thulium light by the second optical-fiber bundling device, the second fibre optic isolater, the second double clad
Fibre, fiber optic splitter, the second multiple die semiconductor laser pump (ing) and feedback unit composition, the first fibre optic isolater of prime amplifier is defeated
Going out end to connect with the second double clad thulium doped fiber of power amplifier, the second double clad thulium doped fiber other end and the second optical fiber close
Bundle device signal end connect, another signal end and second fibre optic isolater of the second optical-fiber bundling device connect, the second optical fiber every
Being connected with the input of fiber optic splitter from device outfan, laser is divided into Output of laser and feedback laser by fiber optic splitter, defeated
The power ratio going out laser and feedback laser exports through laser delivery not less than 99:1, Output of laser, feedback laser and feedback
Unit input connects, and feedback unit outfan and the second multiple die semiconductor laser pump (ing) connect.Described feedback unit includes light
Electric explorer 17, photodetection circuit module 18, Feedback of Power main control module 19 and pump driver 20, feedback laser passes through light
Fibre is coupled into photodetector 17, and photodetection circuit module 18 accepts the signal of telecommunication of photodetector 17 output and locates
Input to Feedback of Power main control module 19 after reason, Feedback of Power main control module 19 control pump driver export corresponding electric current with
Drive the second multiple die semiconductor laser pump (ing) 20.First double clad thulium doped fiber of the present invention, the second double clad thulium doped fiber,
First fibre optic isolater, the second fibre optic isolater, the 3rd fibre optic isolater, laser delivery are the inclined device of guarantor, to realize partially
Shake light.First double clad thulium doped fiber, the core diameter/inner cladding of the second double clad thulium doped fiber are 10 μm/130 μm, fibre core NA
It is 0.15, the absorptance of laser at 793nm is about 4.7dB/m.
Embodiment one
A kind of 2 mu m waveband linear polarization single frequency optical fiber lasers with power feedback mechanism, including king oiscillator, prime amplifier,
Power amplifier and laser delivery with power feedback mechanism.King oiscillator is to work in the single-frequency quasiconductor of 2 mu m wavebands
Laser instrument, works in 2 mu m waveband single-frequency semiconductor laser wavelengths and is positioned at 1850nm-2050nm, single-frequency semiconductor laser
Coupling optical fiber is polarization maintaining optical fibre, king oiscillator include the 3rd semiconductor laser drive, 2 mu m waveband single-frequency semiconductor lasers and
3rd fibre optic isolater, wherein the 3rd semiconductor laser drive drives 2 mu m waveband single-frequency quasiconductors of an optical fiber coupling to swash
Light device (6) Output of laser, the output optical fibre of single-frequency semiconductor laser and the input optical fibre welding of the 3rd fibre optic isolater (7-1)
Together.Prime amplifier by the first optical-fiber bundling device, the first fibre optic isolater, a 793nm multiple die semiconductor laser pump (ing) and
First double clad thulium doped fiber composition, wherein, a 793nm multiple die semiconductor laser pump (ing) is that optical fiber coupling multimode quasiconductor swashs
Light device, operation wavelength is positioned at 793nm, and output optical fibre is 105 μm/125 μm optical fiber, and fibre core NA is 0.22, output about 4W；The
One optical-fiber bundling device is (1+1) × 1 optical-fiber bundling device, and prime amplifier is one-level fiber amplifier level, can increase fiber amplifier level
To realize the laser of more power, prime amplifier is forward pumping.Power amplifier by the second optical-fiber bundling device, the second optical fiber every
Form from device, the second double clad thulium doped fiber, fiber optic splitter, the 2nd 793nm multiple die semiconductor laser pump (ing) and feedback unit.
Wherein, the 2nd 793nm multiple die semiconductor laser pump (ing) is optical fiber coupling multimode semiconductor laser, and operation wavelength is positioned at 793nm,
Output optical fibre is 105 μm/125 μm optical fiber, and fibre core NA is 0.22, output about 8W；Second optical-fiber bundling device is (2+1) × 1
Optical-fiber bundling device, power amplifier is forward pumping, the first fibre optic isolater outfan of prime amplifier and power amplifier
The signal end of the second optical-fiber bundling device connects, the outfan of the second optical-fiber bundling device and second double clad thulium doped fiber one end phase
Connecing, the second double clad thulium doped fiber other end and the second fibre optic isolater connect, the outfan of the second fibre optic isolater and optical fiber
The input of beam splitter is connected, and laser is divided into Output of laser and feedback laser, Output of laser and feedback laser by fiber optic splitter
Power ratio not less than 99:1, the power ratio of Output of laser and feedback laser is preferably 99.5:0.5, and Output of laser is through swashing
Light delivery exports, and feedback laser connects with feedback unit input, feedback unit outfan and the 2nd 793nm multiple die semiconductor
Laser pump (ing) connects；Described feedback unit includes photodetector, photodetection circuit module, Feedback of Power main control module and pump
Pu driver, feedback laser is coupled into photodetector by optical fiber, and it is defeated that photodetection circuit module accepts photodetector
The signal of telecommunication that goes out also inputs to Feedback of Power main control module after processing, and Feedback of Power master control module controls pump driver is defeated
Go out corresponding electric current to drive the 2nd 793nm multiple die semiconductor laser pump (ing).Described first double clad thulium doped fiber, the second double-contracting
Layer thulium doped fiber, the first fibre optic isolater, the second fibre optic isolater, the 3rd fibre optic isolater, laser delivery are the inclined device of guarantor
Part, is used for preventing direction light from entering, to realize polarized light.First double clad thulium doped fiber, the core of the second double clad thulium doped fiber
Footpath/inner cladding is 10 μm/130 μm, and fibre core NA is 0.15, and the absorptance of laser at 793nm is about 4.7dB/m.
For the effect of more intuitive understanding feedback unit, after embodiment is removed feedback unit by the present invention, define
Contrast laser instrument one, specific as follows:
A kind of 2 mu m waveband high power line polarization single frequency optical fiber lasers, including king oiscillator, prime amplifier, power amplifier and
Laser delivery.King oiscillator is to work in the single-frequency semiconductor laser of 2 mu m wavebands, works in 2 mu m waveband single-frequency quasiconductors
Laser wavelength is positioned at 1850nm-2050nm, and the coupling optical fiber of single-frequency semiconductor laser is polarization maintaining optical fibre, and king oiscillator includes
3rd semiconductor laser drive, 2 mu m waveband single-frequency semiconductor laser and the 3rd fibre optic isolaters, wherein the 3rd quasiconductor swashs
CD-ROM driver drives 2 mu m waveband single-frequency semiconductor laser (6) Output of lasers of an optical fiber coupling, single-frequency semiconductor laser
Output optical fibre and the input optical fibre of the 3rd fibre optic isolater (7-1) weld together.Prime amplifier by the first optical-fiber bundling device,
First fibre optic isolater, a 793nm multiple die semiconductor laser pump (ing) and the first double clad thulium doped fiber composition, wherein, first
793nm multiple die semiconductor laser pump (ing) is optical fiber coupling multimode semiconductor laser, and operation wavelength is positioned at 793nm, output optical fibre
Being 105 μm/125 μm optical fiber, fibre core NA is 0.22, output about 4W；First optical-fiber bundling device is (1+1) × 1 optical-fiber bundling
Device, prime amplifier is one-level fiber amplifier level, can increase fiber amplifier level to realize the laser of more power, and prime amplifier is
Forward pumping.Power amplifier is divided by the second optical-fiber bundling device, the second fibre optic isolater, the second double clad thulium doped fiber, optical fiber
Bundle device, the 2nd 793nm multiple die semiconductor laser pump (ing) composition.Wherein, the 2nd 793nm multiple die semiconductor laser pump (ing) is optical fiber coupling
Closing multimode semiconductor laser, operation wavelength is positioned at 793nm, and output optical fibre is 105 μm/125 μm optical fiber, and fibre core NA is 0.22,
Output about 8W；Second optical-fiber bundling device is (2+1) × 1 optical-fiber bundling device, and power amplifier is forward pumping, prime amplifier
The first fibre optic isolater outfan connect with the signal end of the second optical-fiber bundling device of power amplifier, the second optical-fiber bundling device
Outfan and second double clad thulium doped fiber one end connect, the second double clad thulium doped fiber other end and the second fibre optic isolater
Connecting, the outfan of the second fibre optic isolater is connected with the input of fiber optic splitter, and fiber optic splitter is defeated through laser delivery
Go out laser.Described first double clad thulium doped fiber, the second double clad thulium doped fiber, the first fibre optic isolater, the second Fiber isolation
Device, the 3rd fibre optic isolater, laser delivery are the inclined device of guarantor, to realize polarized light.First double clad thulium doped fiber, second
Core diameter/the inner cladding of double clad thulium doped fiber is 10 μm/130 μm, and fibre core NA is 0.15, to the absorption of laser at 793nm
Coefficient is about 4.7dB/m.
Through Experimental comparison, when being not added with feedback, contrast laser instrument one 0 DEG C, 10 DEG C, 20 DEG C, 30 DEG C, 40 DEG C time defeated
Go out power and be respectively 3.2W, 3.11W, 2.9W, 2.65W and 2.35W, and embodiment one is at 0 DEG C, 10 DEG C, 20 DEG C, 30 DEG C, 40 DEG C
Time output be respectively 3.2W, 3.19W, 3.2W, 3.18W and 3.16W, can significantly see the degree of stability of embodiment one
The contrast laser instrument one less adding feedback is obviously improved, and in the range of 0 DEG C-40 DEG C, power instability is below 3%.
The present invention, with 2 mu m waveband single-frequency semiconductor lasers as seed source, utilizes fiber amplifier effectively to be put by its power
Greatly, it is achieved that high-power single-frequency laser, by adding feedback mechanism at power amplifier, it is ensured that laser output power
Stability, make the present invention be held in less than 3% at 0 DEG C of-40 DEG C of operated within range in single longitudinal mode state and instability.
Owing to using said structure, the present invention has that stability is high, power strong, without advantages such as mode hoppings.
Claims (9)
1. with 2 mu m waveband linear polarization single frequency optical fiber lasers of power feedback mechanism, including king oiscillator, pre-amplification
Device, with the power amplifier of power feedback mechanism and laser delivery, it is characterised in that
King oiscillator is to work in the single-frequency semiconductor laser of 2 mu m wavebands；
Prime amplifier is by the first optical-fiber bundling device, the first fibre optic isolater, the first multiple die semiconductor laser pump (ing) and the first double-contracting
Layer thulium doped fiber forms, and pumping end and the first multiple die semiconductor laser pump (ing) of the first optical-fiber bundling device connect, and the first optical fiber closes
The bundle outfan of device and first double clad thulium doped fiber one end connect, the first double clad thulium doped fiber other end and the first optical fiber every
Connect from device；
Power amplifier by the second optical-fiber bundling device, the second fibre optic isolater, the second double clad thulium doped fiber, fiber optic splitter,
Second multiple die semiconductor laser pump (ing) and feedback unit composition, outfan and second double clad of the second optical-fiber bundling device mix thulium light
Fine one end connects, and the second double clad thulium doped fiber other end and the second fibre optic isolater connect, the output of the second fibre optic isolater
End is connected with the input of fiber optic splitter, and laser is divided into Output of laser and feedback laser by fiber optic splitter, Output of laser with
The power ratio of feedback laser is not less than 99:1, and Output of laser exports through laser delivery, and feedback laser inputs with feedback unit
End connects, and feedback unit outfan and the second multiple die semiconductor laser pump (ing) connect；
Wherein, the outfan of king oiscillator connects with the signal end of the first optical-fiber bundling device of prime amplifier, the of prime amplifier
One fibre optic isolater outfan connects with the signal end of the second optical-fiber bundling device of power amplifier, and the output of power amplifier swashs
Light exports through laser delivery, and feedback laser connects with feedback unit input, and feedback unit outfan and the second multimode are partly led
Volumetric laser pumping connects.
A kind of 2 mu m waveband linear polarization single frequency optical fiber lasers with power feedback mechanism the most according to claim 1, its
It is characterised by that feedback unit includes photodetector, photodetection circuit module, Feedback of Power main control module and pump driver,
Feedback laser is coupled into photodetector by optical fiber, and photodetection circuit module receives the signal of telecommunication of photodetector output
And after processing, input to Feedback of Power main control module, the corresponding electricity of Feedback of Power master control module controls pump driver output
Stream is to drive the second multiple die semiconductor laser pump (ing).
A kind of 2 mu m waveband linear polarization single frequency optical fiber lasers with power feedback mechanism the most according to claim 1, its
Be characterised by king oiscillator include the 3rd semiconductor laser drive, 2 mu m waveband single-frequency semiconductor lasers and the 3rd optical fiber every
From device, wherein the 3rd semiconductor laser drive drives 2 mu m waveband single-frequency semiconductor laser (6) outputs of an optical fiber coupling
Laser, the output optical fibre of single-frequency semiconductor laser and the input optical fibre of the 3rd fibre optic isolater (7-1) weld together, and the 3rd
The input of fibre optic isolater (7-1) and the signal end of the first optical-fiber bundling device are connected.
A kind of 2 mu m waveband linear polarization single frequency optical fiber lasers with power feedback mechanism the most according to claim 1, its
It is characterised by that working in 2 mu m waveband single-frequency semiconductor laser wavelengths is positioned at 1850nm-2050nm, single-frequency semiconductor laser
Coupling optical fiber is polarization maintaining optical fibre.
A kind of 2 mu m waveband linear polarization single frequency optical fiber lasers with power feedback mechanism the most according to claim 1, its
Feature is that the first optical-fiber bundling device is (1+1) × 1 optical-fiber bundling device, and the second optical-fiber bundling device is (2+1) × 1 optical-fiber bundling
Device.
A kind of 2 mu m waveband linear polarization single frequency optical fiber lasers with power feedback mechanism the most according to claim 1, its
Feature is that laser is divided into the power ratio of Output of laser and feedback laser, Output of laser and feedback laser by fiber optic splitter
It is well 99.5:0.5.
A kind of 2 mu m waveband linear polarization single frequency optical fiber lasers with power feedback mechanism the most according to claim 1, its
Feature be the first double clad thulium doped fiber, the second double clad thulium doped fiber, the first fibre optic isolater, the second fibre optic isolater,
3rd fibre optic isolater, laser delivery are the inclined device of guarantor.
A kind of 2 mu m waveband linear polarization single frequency optical fiber lasers with power feedback mechanism the most according to claim 1, its
Feature is that the first double clad thulium doped fiber, the core diameter/inner cladding of the second double clad thulium doped fiber are 10 μm/130 μm, fibre core
NA is 0.15, and the absorptance of laser at 793nm is about 4.7dB/m.
A kind of 2 mu m waveband linear polarization single frequency optical fiber lasers with power feedback mechanism the most according to claim 1, its
Feature is that the first multiple die semiconductor laser pump (ing) is optical fiber coupling multimode semiconductor laser, and operation wavelength is positioned at 793nm, defeated
Going out optical fiber is 105 μm/125 μm optical fiber, and fibre core NA is 0.22, output about 4W；Second multiple die semiconductor laser pump (ing) is light
Fine coupling multimode semiconductor laser, operation wavelength is positioned at 793nm, and output optical fibre is 105 μm/125 μm optical fiber, and fibre core NA is
0.22, output about 8W.
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| WO2019218264A1 (en) * | 2018-05-16 | 2019-11-21 | 深圳大学 | Thulium-doped fiber laser amplifier |
| CN110957627A (en) * | 2019-11-08 | 2020-04-03 | 北京工业大学 | High-power 2-micron intermediate infrared thulium-doped optical fiber picosecond laser |
| CN112490832A (en) * | 2020-11-24 | 2021-03-12 | 内蒙古大学 | Erbium-ytterbium co-doped optical fiber amplifier and working method thereof |
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