CN102692782B - High energy time division pulse amplifying system and method - Google Patents
High energy time division pulse amplifying system and method Download PDFInfo
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- CN102692782B CN102692782B CN201210168244.1A CN201210168244A CN102692782B CN 102692782 B CN102692782 B CN 102692782B CN 201210168244 A CN201210168244 A CN 201210168244A CN 102692782 B CN102692782 B CN 102692782B
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Abstract
The invention discloses a high energy time division pulse amplifying system and method, and relates to the filed of laser pulses. The system includes a beam splitting unit, a walk-off and combining unit, an amplifying unit, a rotation unit and a reflection unit, wherein the beam splitting unit is used for separating the input pulse and the reverse pulse; the walk-off and combining unit is connected with the beam splitting unit and used for polarizing and walking off the input pulse to form a plurality of input subpulse and return polarizing and combining the reverse subpulse to form the reverse pulse; the amplifying unit is connected with the walk-off and combining unit, and is used for amplifying the input subpulse and the reverse subpulse; the rotation unit is connected with the amplifying unit and used for rotating the polarization state of the input subpulse and the reverse subpulse; and the reflection unit is connected with the rotation unit, and is used for reflecting the input subpulse to obtain the reverse subpulse. The system and method, provided by the invention, solves the problem that the unchirped pulse of nanosecond or above cannot be amplified through the pulse broadening and compression in the prior art.
Description
Technical field
The present invention relates to laser pulse technical field, particularly a kind of high energy time division pulse amplification system and method.
Background technology
Compared with traditional solid state laser, gas laser, fiber laser has that beam quality is high, volume is little, lightweight, good heat dissipation effect, power conversion efficiency are high and the advantage such as long service life, is a kind of novel high-quality laser instrument.
In many applications, in the application such as such as, location in national defense and military, range finding, homing guidance, deep-space laser communication and simulation target practice, need the pulse fiber of high-peak power to export, it is even higher that the peak power of required pulse reaches MW level.Because the diameter of optical fiber is very little, therefore when the peak power of pulse high to a certain extent time, non-linear phenomena can be there is in a fiber, not only can lower the energy of signal, also can cause damage to system.
In order to prevent system injury, when amplifying the pulse below nanosecond, main employing FCPA technology now, its principle is the chirped pulse of nanosecond with grating stretcher by subpicosecond level short pulse broadening, injection fibre amplifier carries out energy amplification, again the nanosecond chirped pulse after amplification is injected gratings compressor and carry out pulse compression, finally export psec or subpicosecond level short pulse, thus obtain macro-energy high-peak power ultra-short pulse laser.
But for more than nanosecond non-pulse amplifying of warbling, mode above can not be taked to carry out pulse strenching and compression, be a technical barrier of this area.
Summary of the invention
(1) technical matters that will solve
The technical problem to be solved in the present invention is: how to provide a kind of high energy time division pulse amplification system and method, to solve the problem that prior art cannot be amplified more than nanosecond non-pulse of warbling by pulse strenching and compress mode.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of high energy time division pulse amplification system, it comprises: beam splitting unit, walk from conjunction ripple unit, amplifying unit, rotary unit and reflector element;
Described beam splitting unit, for being separated input pulse and described input pulse reverse pulse after reflection;
Described walk from conjunction ripple unit, connect described beam splitting unit, for being walked by described input pulse polarization from being multiple sub-input pulse, and described sub-input pulse reverse pulse is after reflection returned shift ripple is described reverse pulse;
Described amplifying unit, walk described in connection from conjunction ripple unit, for amplifying described sub-input pulse and described sub-reverse pulse;
Described rotary unit, connects described amplifying unit, for rotating the polarization state of described sub-input pulse and described sub-reverse pulse;
Described reflector element, connects described rotary unit, obtains described sub-reverse pulse for reflecting described sub-input pulse.
Preferably, described beam splitting unit adopts PBS.
Preferably, walk described in from close ripple unit and adopt many end to end high birefringence optical fibers.
Preferably, walk from conjunction ripple unit, in predetermined angular between the polarization coordinate of adjacent two described high birefringence optical fibers described in.
Preferably, described predetermined angular is 45 °.
Preferably, the length of described high birefringence optical fiber and refractive index meet following formula:
L×|Δn|/c＞t
0；
Wherein, L represents the length of single described high birefringence optical fiber; Δ n represents the specific refractivity of described high birefringence optical fiber on two polarization directions; C represents the light velocity; t
0represent the width of described input pulse.
Preferably, described amplifying unit adopts big mode field area fibers.
Preferably, described rotary unit adopts Faraday rotator, and the polarization state of described sub-input pulse and described sub-reverse pulse is rotated 45 ° by described Faraday rotator respectively.
The present invention also provides a kind of high energy time division pulse amplification method, and it comprises step:
A: beam splitting unit receives input pulse, and described input pulse is sent to away from conjunction ripple unit;
B: described in walk from described input pulse polarization being walked from for being sent to amplifying unit after multiple sub-input pulse with conjunction ripple unit;
C: described amplifying unit carries out amplification process to described sub-input pulse, and the described sub-input pulse after amplifying is sent to rotary unit;
D: described rotary unit rotates the polarization state of described sub-input pulse, and postrotational described sub-input pulse is sent to reflector element;
E: the described sub-input pulse of described reflector element reflection obtains sub-reverse pulse, and described sub-reverse pulse is sent to described rotary unit;
F: described rotary unit rotates the polarization state of described sub-reverse pulse, and postrotational described sub-reverse pulse is sent to described amplifying unit;
G: described amplifying unit amplifies described sub-reverse pulse, and walk described in the described sub-reverse pulse after amplifying is sent to from conjunction ripple unit;
H: described in walk from described sub-reverse pulse being returned shift ripple with conjunction ripple unit be sent to described beam splitting unit after reverse pulse;
I: described beam splitting unit reflection exports described reverse pulse.
Preferably, in described step D, the polarization state of described sub-input pulse is rotated 45 ° by described rotary unit; In described step F, the polarization state of described sub-reverse pulse is rotated 45 ° by described rotary unit.
(3) beneficial effect
High energy time division pulse amplification system of the present invention and method, by adopt by many high birefringence optical fiber cascades walk from conjunction ripple unit, input pulse is divided into multiple sub-input pulse, again sub-input pulse amplified, merge, final output giant-pulse, solve the problem that prior art cannot be amplified more than nanosecond non-pulse of warbling by pulse strenching and compress mode, expand the object range of pulse amplifying; Meanwhile, for broadening amount and the decrement of pulse, can be regulated by the birefraction and length changing described birefringence fiber, very flexibly.
Accompanying drawing explanation
Fig. 1 is the principle of work schematic diagram of high energy time division pulse amplification system of the present invention;
Fig. 2 is the structural representation of the high energy time division pulse amplification system described in the embodiment of the present invention;
Fig. 3 walks from the structural representation with conjunction ripple unit described in being;
Fig. 4 is the schematic cross-section of described high birefringence optical fiber;
Fig. 5 is the schematic cross-section of adjacent two described high birefringence optical fiber junctions;
Fig. 6 is high energy time division pulse amplification method process flow diagram described in the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Fig. 1 is the principle of work schematic diagram of high energy time division pulse amplification system of the present invention, as shown in Figure 1, input pulse is split into through extra pulse segmentation the sub-input pulse that multiple shape is similar, amplitude is less, the sub-input pulse of sub-input pulse after pulse amplifying process is amplified, the sub-input pulse after amplification obtains a giant-pulse for exporting through pulse combination.
Fig. 2 is the structural representation of the high energy time division pulse amplification system described in the embodiment of the present invention, and as shown in Figure 2, described system comprises: beam splitting unit 100, walk from conjunction ripple unit 200, amplifying unit 300, rotary unit 400 and reflector element 500.
Described beam splitting unit 100, adopts PBS (polarization beam splitter, polarization beam apparatus).The characteristic of PBS is the pulse forward transmission to passing through it, and back reflection, the present embodiment utilizes this characteristic of described PBS, input pulse and described input pulse reverse pulse is after reflection separated.In the present embodiment, the wavelength of described input pulse is 1064 nanometers.
Described walk from conjunction ripple unit 200, connect described beam splitting unit 100, for described input pulse polarization being walked from being multiple sub-input pulse (namely carrying out broadening process to described input pulse), and described sub-input pulse reverse pulse is after reflection returned shift ripple be described reverse pulse (namely to described sub-reverse pulse carry out compression process).Fig. 3 be described in walk from the structural representation closing ripple unit, as shown in Figure 3, described in walk and be welded mutually by head and the tail by many high birefringence optical fibers 201 from conjunction ripple unit 200; Further, in order to obtain higher peak power, described high birefringence optical fiber 201 preferably uses the photonic crystal fiber of hollow high birefringence.Fig. 4 is the schematic cross-section of described high birefringence optical fiber, as shown in Figure 4, two stress rods 2011 are provided with in described high birefringence optical fiber 201, if described two stress rods 2011 line directions are X-direction on described cross section, Y-direction perpendicular to described X-direction, then described high birefringence optical fiber 201 refractive index n in the Y direction
ybe greater than its refractive index n in the X direction
x, such pulse will be divided into 2 polarized pulses in the x-direction and the z-direction after described high birefringence optical fiber 201.X-direction and Y-direction are two polarization directions of described high birefringence optical fiber 201, and form the polarization coordinate of described high birefringence optical fiber 201.Fig. 5 is the schematic cross-section of adjacent two described high birefringence optical fiber junctions, as shown in Figure 5, stress rods 2011 shown in dotted line is positioned on (n-1)th described high birefringence optical fiber 201, stress rods 2011 shown in solid line is positioned on n-th described high birefringence optical fiber 201, can see, in predetermined angular a between the polarization coordinate of adjacent two described high birefringence optical fibers 201, such pulse often will be divided into 2 pulses through a described high birefringence optical fiber 201, therefore through by walk described in high birefringence optical fiber 201 cascade described in n root from conjunction ripple unit 200 after, described input pulse is polarized away from being 2
nindividual sub-input pulse.Equal in order to ensure to split the sub-input pulse amplitude obtained, described predetermined angular a is 45 °.
, it should be noted that, in order to described input pulse being separated in X and Y two polarization directions, length and the refractive index of described high birefringence optical fiber 201 meet following formula meanwhile:
Δt＝L×|Δn|/c＞t
0；
Wherein, L represents the length of single described high birefringence optical fiber 201; Δ n represents the specific refractivity of described high birefringence optical fiber on X and Y two polarization directions; C represents the light velocity; t
0represent the width of described input pulse.According to above-mentioned formula, can see, by increasing the numerical value of L or Δ n, the numerical value of Δ t can be increased, thus the broadening amount to described input pulse can be increased, correspondingly also just adding the decrement to described sub-reverse pulse; Otherwise, then can reduce the broadening amount of described input pulse and the decrement to described sub-reverse pulse.That is, by changing birefraction or the length of described high birefringence optical fiber 201, the adjustment to the broadening amount of described input pulse and the decrement to described sub-reverse pulse can be realized.
Described amplifying unit 300, walk described in connection from conjunction ripple unit 200, for amplifying described sub-input pulse and described sub-reverse pulse.Described amplifying unit 300 adopts the big mode field area fibers to polarization insensitive, and the internal diameter of the area fibers of big mode field described in the present embodiment is 200 microns, and external diameter is 600 microns.
Described rotary unit 400, connects described amplifying unit 300, for rotating the polarization state of described sub-input pulse and described sub-reverse pulse.Described rotary unit 400 adopts Faraday rotator, and the polarization state of described sub-input pulse and described sub-reverse pulse is rotated 45 ° by described Faraday rotator respectively.Like this, described walk from close sub-input pulse that ripple unit 200 exports and walk from compared with the sub-reverse pulse of conjunction ripple unit 200 described in again getting back to, both polarization states differ 90 °, therefore described sub-reverse pulse can by described walk from being a described reverse pulse integrally with conjunction ripple unit 200 times shift ripples.
Described reflector element 500, adopts catoptron, connecting described rotary unit 400, obtaining described sub-reverse pulse for reflecting described sub-input pulse.
Fig. 6 is high energy time division pulse amplification method process flow diagram described in the embodiment of the present invention, and as shown in Figure 6, described method comprises step:
A: beam splitting unit receives input pulse, and described input pulse is sent to away from conjunction ripple unit;
B: described in walk from described input pulse polarization being walked from for being sent to amplifying unit after multiple sub-input pulse with conjunction ripple unit;
C: described amplifying unit carries out amplification process to described sub-input pulse, and the described sub-input pulse after amplifying is sent to rotary unit;
D: the polarization state of described sub-input pulse is rotated 45 ° by described rotary unit, and postrotational described sub-input pulse is sent to reflector element;
E: the described sub-input pulse of described reflector element reflection obtains sub-reverse pulse, and described sub-reverse pulse is sent to described rotary unit;
F: the polarization state of described sub-reverse pulse is rotated 45 ° by described rotary unit, and postrotational described sub-reverse pulse is sent to described amplifying unit;
G: described amplifying unit amplifies described sub-reverse pulse, and walk described in the described sub-reverse pulse after amplifying is sent to from conjunction ripple unit;
H: described in walk from described sub-reverse pulse being returned shift ripple with conjunction ripple unit be sent to described beam splitting unit after reverse pulse;
I: described beam splitting unit reflection exports described reverse pulse.
High energy time division pulse amplification system described in the embodiment of the present invention and method, by adopt by many high birefringence optical fiber cascades walk from conjunction ripple unit, input pulse is divided into multiple sub-input pulse, again sub-input pulse amplified, merge, final output giant-pulse, solve the problem that prior art cannot be amplified more than nanosecond non-pulse of warbling by pulse strenching and compress mode, expand the object range of pulse amplifying; Meanwhile, for broadening amount and the decrement of pulse, can be regulated by the birefraction and length changing described birefringence fiber, very flexibly.
Above embodiment is only for illustration of the present invention; and be not limitation of the present invention; the those of ordinary skill of relevant technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all equivalent technical schemes also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (10)
1. a high energy time division pulse amplification system, is characterized in that, comprising: beam splitting unit, walk from conjunction ripple unit, amplifying unit, rotary unit and reflector element;
Described beam splitting unit, for being separated input pulse and described input pulse reverse pulse after reflection;
Described walk from conjunction ripple unit, connect described beam splitting unit, for being walked by described input pulse polarization from being multiple sub-input pulse, and described sub-input pulse reverse pulse is after reflection returned shift ripple is described reverse pulse;
Described amplifying unit, walk described in connection from conjunction ripple unit, for amplifying described sub-input pulse and described sub-reverse pulse;
Described rotary unit, connects described amplifying unit, for rotating the polarization state of described sub-input pulse and described sub-reverse pulse;
Described reflector element, connects described rotary unit, obtains described sub-reverse pulse for reflecting described sub-input pulse.
2. the system as claimed in claim 1, is characterized in that, described beam splitting unit adopts polarization beam apparatus.
3. the system as claimed in claim 1, is characterized in that, described in walk from close ripple unit and adopt many end to end high birefringence optical fibers.
4. system as claimed in claim 3, is characterized in that, described in walk from conjunction ripple unit, in predetermined angular between the polarization coordinate of adjacent two described high birefringence optical fibers.
5. system as claimed in claim 4, it is characterized in that, described predetermined angular is 45 °.
6. system as claimed in claim 3, it is characterized in that, the length of described high birefringence optical fiber and refractive index meet following formula:
L×|Δn|/c＞t
0；
Wherein, L represents the length of single described high birefringence optical fiber; Δ n represents the specific refractivity of described high birefringence optical fiber on two polarization directions; C represents the light velocity; t
0represent the width of described input pulse.
7. the system as claimed in claim 1, is characterized in that, described amplifying unit adopts big mode field area fibers.
8. the system as claimed in claim 1, is characterized in that, described rotary unit adopts Faraday rotator, and the polarization state of described sub-input pulse and described sub-reverse pulse is rotated 45 ° by described Faraday rotator respectively.
9. a high energy time division pulse amplification method, is characterized in that, comprises step:
A: beam splitting unit receives input pulse, and described input pulse is sent to away from conjunction ripple unit;
B: described in walk from described input pulse polarization being walked from for being sent to amplifying unit after multiple sub-input pulse with conjunction ripple unit;
C: described amplifying unit carries out amplification process to described sub-input pulse, and the described sub-input pulse after amplifying is sent to rotary unit;
D: described rotary unit rotates the polarization state of described sub-input pulse, and postrotational described sub-input pulse is sent to reflector element;
E: the described sub-input pulse of described reflector element reflection obtains sub-reverse pulse, and described sub-reverse pulse is sent to described rotary unit;
F: described rotary unit rotates the polarization state of described sub-reverse pulse, and postrotational described sub-reverse pulse is sent to described amplifying unit;
G: described amplifying unit amplifies described sub-reverse pulse, and walk described in the described sub-reverse pulse after amplifying is sent to from conjunction ripple unit;
H: described in walk from described sub-reverse pulse being returned shift ripple with conjunction ripple unit be sent to described beam splitting unit after reverse pulse;
I: described beam splitting unit reflection exports described reverse pulse.
10. method as claimed in claim 9, it is characterized in that, in described step D, the polarization state of described sub-input pulse is rotated 45 ° by described rotary unit; In described step F, the polarization state of described sub-reverse pulse is rotated 45 ° by described rotary unit.
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| CN104362500B (en) * | 2014-12-04 | 2018-10-02 | 南京朗研光电科技有限公司 | A kind of high-energy ultrashort pulse fiber laser |
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