CN102684046A - Passive mode-locked fiber laser and resonant cavity and rotating angle adjusting device thereof - Google Patents
Passive mode-locked fiber laser and resonant cavity and rotating angle adjusting device thereof Download PDFInfo
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Abstract
The invention is applicable to the technical field of designing a fiber laser, and provides a passive mode-locked fiber laser and a resonant cavity and rotating angle adjusting device thereof. The laser comprises a pumping source and a unidirectional annular resonant cavity, the resonant cavity comprises a doped fiber, a first fiber coupler unit, an isolating unit, a wavelength division multiplexing unit, a rotating polarizer, a 1/2 rotating wave plate, and a 1/4 rotating wave plate, wherein the rotating polarizer is used for outputting linearly polarized lights after filtering some lasers with a second wavelength, the 1/2 rotating wave plate is used for changing the polarization state of lasers penetrated through the rotating polarizer, and the 1/4 rotating wave plate is used for changing the polarization state of lasers penetrated through the 1/2 rotating wave plate and forming elliptically polarized lasers. The resonant cavity is provided with the rotating polarizer and matched with the 1/2 rotating wave plate and the 1/4 rotating wave plate, by means of adjusting the rotating angles of the rotating polarizer, the 1/2 rotating wave plate and the 1/4 rotating wave plate, mode-locked pulses can be formed, so that the inner structure of the resonant cavity is simplified, and the size of the resonant cavity is reduced.
Description
Technical field
The invention belongs to the fiber laser design field, relate in particular to a kind of passive mode-locking fiber laser and resonant cavity thereof, anglec of rotation adjusting device.
Background technology
In recent years, characteristics such as passive mode-locking fiber laser is high with its repetition rate, and efficient is high, and good beam quality is tunable, short pulse and developing rapidly, and important use is arranged in fields such as ultrafast optics, super continuous spectrums generation, communications.
Usually, the locked mode mode of passive mode-locking fiber laser has following several types: saturable absorber locked mode, non-linear amplification annular chamber locked mode, nonlinear optics annular chamber locked mode and nonlinear polarization rotation locked mode.Because the formation of mode locking pulse receives the influence of polarization state in the resonant cavity; Thereby various locked mode schemes often all need be inserted some polarizers and reach the purpose that changes polarization state in the chamber and then form mode locking pulse in resonant cavity; Polarizer commonly used has Polarization Controller, the polarizer and wave plate etc.
Fig. 1 shows the typical structure of the passive mode-locking fiber laser that prior art provides, and it comprises: pumping source is used to export the pump light with first wavelength value; And the unidirectional loop resonant cavity, be used for exporting after pump light with pumping source output converts short-pulse laser to.Resonant cavity wherein specifically comprises: as the doped fiber of gain substance, be used for converting the pump light with first wavelength value of pumping source output to second wavelength value laser; The polarizer is used for the laser filtering to varying strength; Optic fiber coupling unit is used for the laser coupled that partly has second wavelength value is gone into the polarizer; Polarization Controller utilizes the optical fiber elasto-optical effect to change the birefringence in the optical fiber, with the polarization state of the laser of control Optical Fiber Transmission; Isolated location is used for guaranteeing the one-way of resonant cavity laser transmission; The wavelength division multiplexing unit is used for the pump light with first wavelength value of pumping source output is gone into resonant cavity with the laser coupled behind isolated location.Wherein, wavelength division multiplexing unit, doped fiber, optic fiber coupling unit, the polarizer, Polarization Controller and isolated location are arranged along the direction of laser transmission in the resonant cavity in order.
Can find out, in the prior art,, can't adjust its polarization direction, therefore need in resonant cavity, insert Polarization Controller or a plurality of wave plate just can obtain mode locking pulse because the polarization direction of the polarizer is fixed.In resonant cavity, insert under the mode of Polarization Controller; Though it is less to insert loss; But,, otherwise can cause fracture so the bending radius of optical fiber can not be too small because Polarization Controller has mainly utilized the stress birfringence of looping of optical fiber; Thereby caused the volume of Polarization Controller bigger, be unfavorable for the miniaturization of product.In resonant cavity, insert under the mode of a plurality of wave plates, often need λ/4, λ/2, the combination successively of λ/4 three wave plate could obtain the output of mode locking pulse through adjusting, so volume is also bigger, is unfavorable for the miniaturization of product.
Summary of the invention
The object of the present invention is to provide a kind of passive mode-locking fiber laser; Be intended to solve the passive mode-locking fiber laser that prior art provides; Because the polarization direction of the polarizer is fixed in the resonant cavity; Need to add the bigger Polarization Controller of volume or the combination of a plurality of wave plates, cause the bigger problem of volume of product.
The present invention realizes like this; A kind of passive mode-locking fiber laser; Comprise pumping source and unidirectional loop resonant cavity; Said resonant cavity comprises that the pump light with first wavelength value with said pumping source output converts doped fiber, first optic fiber coupling unit, isolated location, the wavelength division multiplexing unit of the laser with second wavelength value to; Said resonant cavity also comprises: to the rotation polarizer of polarization light output after the said laser filtering with second wavelength value of part, change through 1/2 rotating wave plate of the polarization state of the laser of the said rotation polarizer and change polarization state through the laser of said 1/2 rotating wave plate to form 1/4 rotating wave plate of elliptically polarized light;
Said wavelength division multiplexing unit, doped fiber, first optic fiber coupling unit, the rotation polarizer, 1/2 rotating wave plate, 1/4 rotating wave plate and isolated location are along the direction of laser transmission in said resonant cavity closed loop arrangement in order.
Further; Said laser can also comprise: an anglec of rotation adjusting device; It connects the said rotation polarizer, 1/2 rotating wave plate and 1/4 rotating wave plate; Receive the said laser of another part, and the laser that has second wavelength value when another part is said drives the said rotation polarizer, 1/2 rotating wave plate and the rotation of 1/4 rotating wave plate when being continuous light and the laser that has second wavelength value when another part is said stops to drive the said rotation polarizer, 1/2 rotating wave plate and 1/4 rotating wave plate when being mode locking pulse and rotates with second wavelength value.
Further, said anglec of rotation adjusting device can comprise:
First stepping motor that connects the said rotation polarizer;
Second stepping motor that connects said 1/2 rotating wave plate and 1/4 rotating wave plate;
Input optical signal is converted to the first photodetection unit of exporting behind the signal of telecommunication;
Part in the said laser with second wavelength value of another part is coupled into second optic fiber coupling unit of the said first photodetection unit input;
Connect the said first photodetection unit output, the signal of telecommunication that the said first photodetection unit is exported carries out waveform amplification and the shaping unit that waveform amplifies and export shaping processing back;
Control unit; It connects said waveform amplification and shaping unit, first stepping motor and second stepping motor, amplifies and the signal of telecommunication of shaping unit output drives said rotation polarizer rotation and drives said 1/2 rotating wave plate and the rotation of 1/4 rotating wave plate and work as that said first stepping motor stops to drive the said rotation polarizer and said second stepping motor stops to drive said 1/2 rotating wave plate and 1/4 rotating wave plate rotates through controlling through controlling when judging that the said laser with second wavelength value of another part is mode locking pulse through controlling said second stepping motor through controlling said first stepping motor when judging that the said laser with second wavelength value of another part is continuous light according to said waveform.
Further, said laser can also comprise:
Place the second photodetection unit on another part transmission path of the said laser with second wavelength value of another part of said second optic fiber coupling unit.
Simultaneously, said first photodetector unit can be a PIN structured light electric explorer; Said control unit can be a single-chip microcomputer.
Another object of the present invention is to; A kind of resonant cavity of passive mode-locking fiber laser also is provided; Said resonant cavity is the unidirectional loop resonant cavity; Comprise that the pump light with first wavelength value with said pumping source output converts doped fiber, first optic fiber coupling unit, isolated location, the wavelength division multiplexing unit of the laser with second wavelength value to; Said resonant cavity also comprises: to the rotation polarizer of polarization light output after the said laser filtering with second wavelength value of part, change through 1/2 rotating wave plate of the polarization state of the laser of the said rotation polarizer and change polarization state through the laser of said 1/2 rotating wave plate to form 1/4 rotating wave plate of elliptically polarized light;
Said wavelength division multiplexing unit, doped fiber, first optic fiber coupling unit, the rotation polarizer, 1/2 rotating wave plate, 1/4 rotating wave plate and isolated location are along the direction of laser transmission in said resonant cavity closed loop arrangement in order.
Further, the said rotation polarizer, 1/2 rotating wave plate and 1/4 rotating wave plate can all connect an anglec of rotation adjusting device, and said anglec of rotation adjusting device comprises:
First stepping motor that connects the said rotation polarizer;
Second stepping motor that connects said 1/2 rotating wave plate and 1/4 rotating wave plate;
Input optical signal is converted to the first photodetection unit of exporting behind the signal of telecommunication;
Part in the said laser with second wavelength value of another part is coupled into second optic fiber coupling unit of the said first photodetection unit input;
Connect the said first photodetection unit output, the signal of telecommunication that the said first photodetection unit is exported carries out waveform amplification and the shaping unit that waveform amplifies and export shaping processing back;
Control unit; It connects said waveform amplification and shaping unit, first stepping motor and second stepping motor, amplifies and the signal of telecommunication of shaping unit output drives said rotation polarizer rotation and drives said 1/2 rotating wave plate and the rotation of 1/4 rotating wave plate and work as that said first stepping motor stops to drive the said rotation polarizer and said second stepping motor stops to drive said 1/2 rotating wave plate and 1/4 rotating wave plate rotates through controlling through controlling when judging that the said laser with second wavelength value of another part is mode locking pulse through controlling said second stepping motor through controlling said first stepping motor when judging that the said laser with second wavelength value of another part is continuous light according to said waveform.
Further, said first photodetector unit can be a PIN structured light electric explorer; Said control unit can be a single-chip microcomputer.
Another object of the present invention is to; A kind of anglec of rotation adjusting device of passive mode-locking fiber laser also is provided; Said anglec of rotation adjusting device connects the rotation polarizer of a unidirectional loop resonant cavity, 1/2 rotating wave plate and 1/4 rotating wave plate, and said anglec of rotation adjusting device comprises:
First stepping motor that connects the said rotation polarizer;
Second stepping motor that connects said 1/2 rotating wave plate and 1/4 rotating wave plate;
Input optical signal is converted to the first photodetection unit of exporting behind the signal of telecommunication;
Part in the said laser with second wavelength value of another part is coupled into second optic fiber coupling unit of the said first photodetection unit input;
Connect the said first photodetection unit output, the signal of telecommunication that the said first photodetection unit is exported carries out waveform amplification and the shaping unit that waveform amplifies and export shaping processing back;
Control unit; It connects said waveform amplification and shaping unit, first stepping motor and second stepping motor, amplifies and the signal of telecommunication of shaping unit output drives said rotation polarizer rotation and drives said 1/2 rotating wave plate and the rotation of 1/4 rotating wave plate and work as that said first stepping motor stops to drive the said rotation polarizer and said second stepping motor stops to drive said 1/2 rotating wave plate and 1/4 rotating wave plate rotates through controlling through controlling when judging that the said laser with second wavelength value of another part is mode locking pulse through controlling said second stepping motor through controlling said first stepping motor when judging that the said laser with second wavelength value of another part is continuous light according to said waveform.
Further, said first photodetector unit can be a PIN structured light electric explorer; Said control unit can be a single-chip microcomputer.
Among the present invention; The resonant cavity of passive mode-locking fiber laser has adopted the rotation polarizer, and is combined with 1/2 rotating wave plate and 1/4 rotating wave plate, through the adjustment rotation polarizer; The anglec of rotation of 1/2 rotating wave plate and 1/4 rotating wave plate; Can form mode locking pulse, thereby simplify the internal structure of resonant cavity, reduce the volume of resonant cavity.
Description of drawings
Fig. 1 is the structure chart of the passive mode-locking fiber laser that provides of prior art;
Fig. 2 is the structure chart of the passive mode-locking fiber laser that provides of one embodiment of the invention;
Fig. 3 is the structure chart of the passive mode-locking fiber laser that provides of another embodiment of the present invention;
Fig. 4 is the structure chart of anglec of rotation adjusting device among Fig. 3.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The bigger problem of volume that the passive mode-locking fiber laser that provides to prior art exists, among the present invention, the resonant cavity of passive mode-locking fiber laser has adopted the rotation polarizer, and 1/2 rotating wave plate that is used and 1/4 rotating wave plate.
Fig. 2 shows the structure of the passive mode-locking fiber laser that one embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with this embodiment of the invention.
In the one embodiment of the invention, passive mode-locking fiber laser comprises: pumping source 11 is used to export the pump light with first wavelength value; And unidirectional loop resonant cavity 12, be used for exporting after pump light with pumping source 11 output converts short-pulse laser to.Resonant cavity 12 wherein specifically comprises: as the doped fiber 127 of gain substance, be used for converting the pump light with first wavelength value of pumping source 11 outputs to second wavelength value laser; The rotation polarizer 123; First optic fiber coupling unit 122 is used for the laser coupled that part has second wavelength value is gone into to rotate the polarizer 123, and is had polarization light output after the laser filtering of second wavelength value by 123 pairs of these parts of the rotation polarizer; 1/2 rotating wave plate 124 is used to change the polarization state through the laser of the rotation polarizer 123; 1/4 rotating wave plate 125 is used to change polarization state through the laser of 1/2 rotating wave plate 124 to form elliptically polarized light; Isolated location 126 is used for guaranteeing the one-way of resonant cavity 12 laser transmission; Wavelength division multiplexing unit 121 is used for the pump light with first wavelength value of pumping source 11 outputs is gone into resonant cavity 12 with the laser coupled behind isolated location 126.
Wherein, wavelength division multiplexing unit 121, doped fiber 127, first optic fiber coupling unit 122, the rotation polarizer 123,1/2 rotating wave plate, 124,1/4 rotating wave plate 125 and isolated location 126 are along the direction (that is: direction shown in the empty arrow among Fig. 1) of laser transmission in the resonant cavity 12 closed loop arrangement in order.
Among the present invention, it is that a power is the 980nm semiconductor laser of 500mW that pumping source 11 can be not limited to; It is one 980/1550 wavelength division multiplexers that wavelength division multiplexing unit 121 can be not limited to; It is the long doped fiber of a 20m that doped fiber 127 can be not limited to, and the absorption coefficient of this doped fiber at the 975nm place is 7dB/m; It is 1 that first optic fiber coupling unit 122 can be not limited to: 90 coupler; It is that an isolation is 30dB and isolator polarization irrelevant that isolated location 126 can be not limited to.
Among the present invention; The resonant cavity 12 of passive mode-locking fiber laser has adopted the rotation polarizer 123, and is combined with 1/2 rotating wave plate 124 and 1/4 rotating wave plate 125, through the adjustment rotation polarizer 123; The anglec of rotation of 1/2 rotating wave plate 124 and 1/4 rotating wave plate 125; Can form mode locking pulse, thereby simplify the internal structure of resonant cavity 12, reduce the volume of resonant cavity 12.
The operation principle of the passive mode-locking fiber laser that this embodiment of the invention provides is following: be coupled into the laser that the part of the rotation polarizer 123 has second wavelength value and form linearly polarized lights through the rotation polarizer 123 backs, form elliptically polarized lights through 1/4 rotating wave plate 125 again; In Optical Fiber Transmission subsequently; Because non-linear rotation effect, the peak value of short pulse has the different anglecs of rotation with the both wings of pulse, through accumulation for a long time; When peak value and the both wings anglec of rotation differ 90 °; Reasonably the angle of adjustment 1/2 rotating wave plate 124 makes peak value of pulse see through the both wings that rotate the polarizer 123 and stop pulse fully, and can form this moment stablizes level and smooth mode locking pulse, and through 122 outputs of first optic fiber coupling unit.
In order further to realize the rotation polarizer 123; The automatic adjusting of the anglec of rotation of 1/2 rotating wave plate 124 and 1/4 rotating wave plate 125; The another kind of passive mode-locking fiber laser of the present invention; Show the structure of the passive mode-locking fiber laser that another embodiment of the present invention provides like Fig. 3,, only show the part relevant with this embodiment of the invention for the ease of explanation.
With shown in Figure 2 different; The passive mode-locking fiber laser that another embodiment of the present invention provides is on basis shown in Figure 2; Increased by the anglec of rotation adjusting device 13 that connects with the rotation polarizer 123,1/2 rotating wave plates 124 and 1/4 rotating wave plate 125, be used to receive the laser that another part of first optic fiber coupling unit, 122 outputs has second wavelength value; And the laser that has second wavelength value when this another part driven rotary polarizer 123 when being continuous light; 1/2 rotating wave plate 124 and the rotation of 1/4 rotating wave plate 125 and the laser that has second wavelength value when this another part stop the driven rotary polarizer 123,1/2 rotating wave plates 124 when being mode locking pulse and 1/4 rotating wave plate 125 rotates, and passive mode-locking fiber laser after this rests under the locked mode operating state; And export stable mode locking pulse; Thereby realized the automatic rotation adjusting function of the rotation polarizer 123,1/2 rotating wave plates 124 and 1/4 rotating wave plate 125, convenient for users to use.
Fig. 4 shows the structure of anglec of rotation adjusting device 13 among Fig. 3.
Particularly, anglec of rotation adjusting device 13 comprises: first stepping motor 135 that connects the rotation polarizer 123; Second stepping motor 136 that connects 1/2 rotating wave plate 124 and 1/4 rotating wave plate 125; Input optical signal is converted to the first photodetection unit of exporting behind the signal of telecommunication 132; Another part of first optic fiber coupling unit 122 output is had a part in the laser of second wavelength value and be coupled into second optic fiber coupling unit 131 of the first photodetection unit, 132 inputs; Connect the first photodetection unit, 132 outputs, the signal of telecommunication that the first photodetection unit 132 is exported carries out waveform amplification and the shaping unit 133 that waveform amplifies and export shaping processing back; Connect waveform and amplify and shaping unit 133, first stepping motor 135 and second stepping motor 136, amplify and the driven rotary polarizer 123 rotations and drive 1/2 rotating wave plate 124 and 125 rotations of 1/4 rotating wave plate and work as laser that another part of judging 122 outputs of first optic fiber coupling unit has second wavelength value and stop the driven rotary polarizer 123 and stop to drive the control unit 134 that 1/2 rotating wave plate 124 and 1/4 rotating wave plate 125 rotate through controlling first stepping motor 135 when being mode locking pulse through controlling first stepping motor 135 when judging that laser that another part of first optic fiber coupling unit, 122 outputs has second wavelength value is continuous light of the signal of telecommunication of shaping unit 133 outputs through controlling second stepping motor 136 through controlling second stepping motor 136 according to waveform.
In addition, the passive mode-locking fiber laser that this embodiment of the invention provides can also comprise: place another part through second optic fiber coupling unit 131 to have the second photodetection unit 14 on another part transmission path of laser of second wavelength value; Second optic fiber coupling unit 131 also is used for another part that another part with the output of first optic fiber coupling unit 122 has the laser of second wavelength value and is coupled into one second photodetection unit.
Certainly; The rotation polarizer 123,1/2 rotating wave plate 124 and 1/4 rotating wave plate 125 also can be controlled by same stepping motor; Perhaps rotate the polarizer 123,1/2 rotating wave plate 124 and 1/4 rotating wave plate 125 and adopt different stepping motors to control respectively, or adopt the control mode of other combination.
Among the present invention, it is a PIN structured light electric explorer that first photodetector unit 132 can be not limited to; It is that a model is the photodetector of NEWPORT 818BB-31 that the second photodetection unit can be not limited to; It is a single-chip microcomputer that control unit 134 can be not limited to.
The present invention also provides a kind of resonant cavity of passive mode-locking fiber laser, and its structure such as Fig. 2 and shown in Figure 3 repeat no more at this.
The present invention also provides a kind of anglec of rotation adjusting device of passive mode-locking fiber laser, and its structure such as Fig. 3 and shown in Figure 4 repeat no more at this.
Among the present invention; The resonant cavity 12 of passive mode-locking fiber laser has adopted the rotation polarizer 123, and is combined with 1/2 rotating wave plate 124 and 1/4 rotating wave plate 125, through the adjustment rotation polarizer 123; The anglec of rotation of 1/2 rotating wave plate 124 and 1/4 rotating wave plate 125; Can form mode locking pulse, thereby simplify the internal structure of resonant cavity 12, reduce the volume of resonant cavity 12.And further; Passive mode-locking fiber laser of the present invention can also comprise anglec of rotation adjusting device 13; It is that continuous light or mode locking pulse are judged through the laser with second wavelength value to 122 outputs of first optic fiber coupling unit; And whether, thereby realized the rotation polarizer 123 according to the rotation of the judged result control rotation polarizer 123,1/2 rotating wave plates 124 and 1/4 rotating wave plate 125; The automatic rotation adjusting function of 1/2 rotating wave plate 124 and 1/4 rotating wave plate 125, convenient for users to use.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. passive mode-locking fiber laser; Comprise pumping source and unidirectional loop resonant cavity; Said resonant cavity comprises that the pump light with first wavelength value with said pumping source output converts doped fiber, first optic fiber coupling unit, isolated location, the wavelength division multiplexing unit of the laser with second wavelength value to; It is characterized in that; Said resonant cavity also comprises: to the rotation polarizer of polarization light output after the said laser filtering with second wavelength value of part, change through 1/2 rotating wave plate of the polarization state of the laser of the said rotation polarizer and change polarization state through the laser of said 1/2 rotating wave plate to form 1/4 rotating wave plate of elliptically polarized light;
Said wavelength division multiplexing unit, doped fiber, first optic fiber coupling unit, the rotation polarizer, 1/2 rotating wave plate, 1/4 rotating wave plate and isolated location are along the direction of laser transmission in said resonant cavity closed loop arrangement in order.
2. passive mode-locking fiber laser as claimed in claim 1; It is characterized in that; Said laser also comprises: an anglec of rotation adjusting device; It connects the said rotation polarizer, 1/2 rotating wave plate and 1/4 rotating wave plate; Receive the said laser of another part, and the laser that has second wavelength value when another part is said drives the said rotation polarizer, 1/2 rotating wave plate and the rotation of 1/4 rotating wave plate when being continuous light and the laser that has second wavelength value when another part is said stops to drive the said rotation polarizer, 1/2 rotating wave plate and 1/4 rotating wave plate when being mode locking pulse and rotates with second wavelength value.
3. passive mode-locking fiber laser as claimed in claim 2 is characterized in that, said anglec of rotation adjusting device comprises:
First stepping motor that connects the said rotation polarizer;
Second stepping motor that connects said 1/2 rotating wave plate and 1/4 rotating wave plate;
Input optical signal is converted to the first photodetection unit of exporting behind the signal of telecommunication;
Part in the said laser with second wavelength value of another part is coupled into second optic fiber coupling unit of the said first photodetection unit input;
Connect the said first photodetection unit output, the signal of telecommunication that the said first photodetection unit is exported carries out waveform amplification and the shaping unit that waveform amplifies and export shaping processing back;
Control unit; It connects said waveform amplification and shaping unit, first stepping motor and second stepping motor, amplifies and the signal of telecommunication of shaping unit output drives said rotation polarizer rotation and drives said 1/2 rotating wave plate and the rotation of 1/4 rotating wave plate and work as that said first stepping motor stops to drive the said rotation polarizer and said second stepping motor stops to drive said 1/2 rotating wave plate and 1/4 rotating wave plate rotates through controlling through controlling when judging that the said laser with second wavelength value of another part is mode locking pulse through controlling said second stepping motor through controlling said first stepping motor when judging that the said laser with second wavelength value of another part is continuous light according to said waveform.
4. passive mode-locking fiber laser as claimed in claim 3 is characterized in that, said laser also comprises:
Place the second photodetection unit on another part transmission path of the said laser with second wavelength value of another part of said second optic fiber coupling unit.
5. passive mode-locking fiber laser as claimed in claim 3 is characterized in that, said first photodetector unit is a PIN structured light electric explorer; Said control unit is a single-chip microcomputer.
6. the resonant cavity of a passive mode-locking fiber laser; Said resonant cavity is the unidirectional loop resonant cavity; Comprise that the pump light with first wavelength value with said pumping source output converts doped fiber, first optic fiber coupling unit, isolated location, the wavelength division multiplexing unit of the laser with second wavelength value to; It is characterized in that; Said resonant cavity also comprises: to the rotation polarizer of polarization light output after the said laser filtering with second wavelength value of part, change through 1/2 rotating wave plate of the polarization state of the laser of the said rotation polarizer and change polarization state through the laser of said 1/2 rotating wave plate to form 1/4 rotating wave plate of elliptically polarized light;
Said wavelength division multiplexing unit, doped fiber, first optic fiber coupling unit, the rotation polarizer, 1/2 rotating wave plate, 1/4 rotating wave plate and isolated location are along the direction of laser transmission in said resonant cavity closed loop arrangement in order.
7. the resonant cavity of passive mode-locking fiber laser as claimed in claim 6 is characterized in that, the said rotation polarizer, and 1/2 rotating wave plate and 1/4 rotating wave plate all connect an anglec of rotation adjusting device, and said anglec of rotation adjusting device comprises:
First stepping motor that connects the said rotation polarizer;
Second stepping motor that connects said 1/2 rotating wave plate and 1/4 rotating wave plate;
Input optical signal is converted to the first photodetection unit of exporting behind the signal of telecommunication;
Part in the said laser with second wavelength value of another part is coupled into second optic fiber coupling unit of the said first photodetection unit input;
Connect the said first photodetection unit output, the signal of telecommunication that the said first photodetection unit is exported carries out waveform amplification and the shaping unit that waveform amplifies and export shaping processing back;
Control unit; It connects said waveform amplification and shaping unit, first stepping motor and second stepping motor, amplifies and the signal of telecommunication of shaping unit output drives said rotation polarizer rotation and drives said 1/2 rotating wave plate and the rotation of 1/4 rotating wave plate and work as that said first stepping motor stops to drive the said rotation polarizer and said second stepping motor stops to drive said 1/2 rotating wave plate and 1/4 rotating wave plate rotates through controlling through controlling when judging that the said laser with second wavelength value of another part is mode locking pulse through controlling said second stepping motor through controlling said first stepping motor when judging that the said laser with second wavelength value of another part is continuous light according to said waveform.
8. the resonant cavity of passive mode-locking fiber laser as claimed in claim 7 is characterized in that, said first photodetector unit is a PIN structured light electric explorer; Said control unit is a single-chip microcomputer.
9. the anglec of rotation adjusting device of a passive mode-locking fiber laser; It is characterized in that; Said anglec of rotation adjusting device connects the rotation polarizer of a unidirectional loop resonant cavity, 1/2 rotating wave plate and 1/4 rotating wave plate, and said anglec of rotation adjusting device comprises:
First stepping motor that connects the said rotation polarizer;
Second stepping motor that connects said 1/2 rotating wave plate and 1/4 rotating wave plate;
Input optical signal is converted to the first photodetection unit of exporting behind the signal of telecommunication;
Part in the said laser with second wavelength value of another part is coupled into second optic fiber coupling unit of the said first photodetection unit input;
Connect the said first photodetection unit output, the signal of telecommunication that the said first photodetection unit is exported carries out waveform amplification and the shaping unit that waveform amplifies and export shaping processing back;
Control unit; It connects said waveform amplification and shaping unit, first stepping motor and second stepping motor, amplifies and the signal of telecommunication of shaping unit output drives said rotation polarizer rotation and drives said 1/2 rotating wave plate and the rotation of 1/4 rotating wave plate and work as that said first stepping motor stops to drive the said rotation polarizer and said second stepping motor stops to drive said 1/2 rotating wave plate and 1/4 rotating wave plate rotates through controlling through controlling when judging that the said laser with second wavelength value of another part is mode locking pulse through controlling said second stepping motor through controlling said first stepping motor when judging that the said laser with second wavelength value of another part is continuous light according to said waveform.
10. the anglec of rotation adjusting device of passive mode-locking fiber laser as claimed in claim 9 is characterized in that, said first photodetector unit is a PIN structured light electric explorer; Said control unit is a single-chip microcomputer.
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| CN104538826A (en) * | 2015-01-22 | 2015-04-22 | 大族激光科技产业集团股份有限公司 | Ultra-short pulse optical fiber laser |
| CN104538826B (en) * | 2015-01-22 | 2019-04-12 | 大族激光科技产业集团股份有限公司 | Ultrashort pulse fiber laser |
| CN106289155A (en) * | 2016-07-21 | 2017-01-04 | 哈尔滨工业大学 | A kind of hypersensitive angle detecting devices based on photon trajectory angular momentum and method |
| CN111969401A (en) * | 2020-08-31 | 2020-11-20 | 中国科学院合肥物质科学研究院 | Pulse energy increasing method of self-starting Figure-9 passive mode-locking optical fiber laser |
| CN111969401B (en) * | 2020-08-31 | 2021-08-17 | 中国科学院合肥物质科学研究院 | Pulse energy increasing method of self-starting Figure-9 passive mode-locking optical fiber laser |
| CN116683271A (en) * | 2023-08-04 | 2023-09-01 | 北京卓镭激光技术有限公司 | Pulse width continuously adjustable fiber laser |
| CN116683271B (en) * | 2023-08-04 | 2023-11-21 | 北京卓镭激光技术有限公司 | Pulse width continuously adjustable fiber laser |
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Application publication date: 20120919 |