CN208189970U - Enlarged structure is divided in pulse - Google Patents
Enlarged structure is divided in pulse Download PDFInfo
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- CN208189970U CN208189970U CN201820877662.0U CN201820877662U CN208189970U CN 208189970 U CN208189970 U CN 208189970U CN 201820877662 U CN201820877662 U CN 201820877662U CN 208189970 U CN208189970 U CN 208189970U
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Abstract
The utility model discloses a kind of pulses to divide enlarged structure, and pulse segmentation enlarged structure includes pulse series generator part, amplifier channel group, polarization rational component, polarization beam apparatus and the polarization rotator part for generating the train of pulse with the first polarization mode；Amplifier channel group includes the first amplifier channel and the second amplifier channel, the train of pulse all the way that first amplifier channel is used to export pulse series generator part amplifies, form the first amplification train of pulse with the first polarization mode, the another way train of pulse that second amplifier channel is used to export pulse series generator part amplifies, form the second amplification train of pulse with the first polarization mode, first amplifier channel has first phase control device, and second amplifier channel has second phase control device.The utility model does not require the size of delay line, and can independent control amplitude and phase.
Description
Technical field
The utility model relates to a kind of pulses to divide enlarged structure.
Background technique
Currently, high power ultra-short pulse laser device is in industrial Precision Machining, biomedicine, national defense industry, scientific research etc.
Field has a wide range of applications.Ultrashort pulse laser is continuously increased with light intensity, and expanded new application field: particle adds
The generation of speed, higher hamonic wave.
To inhibit nonlinear effect in optical fiber, high-peak power, ultra-short pulse laser output, common solution are obtained
It is chirped pulse amplification (CPA) technology.Color dispersion-type optical component is introduced usually between oscillator and amplifier by ultrashort arteries and veins
Punching broadens in the time domain, and then the long pulse of broadening is coupled in amplifier and carries out power amplification, finally passes through antibody Monoclonal again
The high grating of threshold value carries out pulse compression.In optical fiber laser, the solution that peak power is significantly increased is by small core
The optical fiber of diameter high-NA (NA) changes the optical fiber of the low numerical aperture of big mode field area into.Currently, pulse interval and time segmentation
Amplify (DPA) technology, is the effective way for realizing high repetition frequency and high pulse energy, by the technology and chirped pulse amplification
(CPA), the technologies such as coherent beam synthesis (CBC) combine, it is possible to obtain are higher by the pulse energy of CPA a number of orders of magnitude, simultaneously
Keep high repetition frequency.
Traditional DPA technology is to divide pulse in the time domain, by time delay, then recombines.Moral in 2013
The researcher of Uni Jena of state proposes that active control pulse segmentation amplification (ADPA) technical solution, the program are independent using two sets
Device, by pulse divide and synthesize separate.
In traditional DPA method, single pulse is divided into 2N arteries and veins in the time domain after N number of optical delay line
Punching, obtains lower peak value of pulse intensity.As shown in Figure 1, pulse resolves into 4 subpulses by temporal segmentation twice.Figure
The pulse on right side with 45° angle linear polarization, i.e., it include equal quantities p and s polarization.When propagating pulse to the left, polarization point
Beam device PBS 2 transmits p-polarization component, and s polarized component is reflected into delay line DL 2.Therefore s polarized portion is delayed by, and
By 2 second secondary reflection of PBS, it is arranged in after the p-polarization component previously transmitted.Since two pulses are cross-polarization,
Therefore 45 ° of p-polarization components and s polarized component that can separate them again by PBS 1 are rotated with half-wave plate (HWP), thus
DL1 is sent by the part polarized s.DL1 length is the half of DL2 length, so just produces alternately cross-polarization and difference
Four pulses of phase.Opposite direction (to right side on the left of from Fig. 1), above four have different polarization and phase pattern
Pulse is merged into a single pulse by corresponding delay path.In ADPA, segmentation and synthesis grade are separated, need
Want two groups of delay lines.
This mode has the disadvantage that
1, the size and number of optical delay line make system more complicated.
2, in amplification process, the energy in Active Optical Fiber can be largely extracted, and generation gain saturatiuon will lead to each
Different amplifications is undergone in pulse, so as to cause the amplitude and nonlinear phase mismatch between pulse, influences subsequent synthesis.
3, amplitude and nonlinear phase cannot be individually formed, and amplitude and/or phase mismatch 100% cannot be compensated.
Summary of the invention
Technical problem to be solved in the utility model is to overcome the deficiencies of existing technologies, and provides a kind of pulse segmentation amplification
Structure, it does not require the size of delay line, and can independent control amplitude and phase.
In order to solve the above-mentioned technical problem, the technical solution of the utility model is: a kind of pulse segmentation enlarged structure, it is wrapped
It includes:
For generating the pulse series generator part of the train of pulse with the first polarization mode；
Amplifier channel group, amplifier channel group include the first amplifier channel and the second amplifier channel, described first
The train of pulse all the way that amplifier channel is used to export pulse series generator part amplifies, and being formed has the first polarization mode
First amplification train of pulse, the another way train of pulse that second amplifier channel is used to export pulse series generator part are put
Greatly, the second amplification train of pulse with the first polarization mode is formed, first amplifier channel has first phase controller
Part, second amplifier channel have second phase control device, the first phase control device and the second phase
It is different that control device has the train of pulse by the first amplifier channel and the train of pulse by the second amplifier channel
Relative phase distribution；
Polarization rational component, the polarization rational component amplify for receiving the second amplification train of pulse to second
The polarization direction of train of pulse is rotated, and the second amplification train of pulse is made to have the second polarization mode different from the first polarization mode
Formula；
Polarization beam apparatus, the polarization beam apparatus are used to receive the first amplification train of pulse and second of the first polarization mode partially
Second amplification train of pulse of vibration mode, and amplify the second of train of pulse and the second polarization mode for the first of the first polarization mode and put
Big train of pulse interference superposition, forms the train of pulse with alternately orthogonal polarization mode；
Polarization rotator part, the polarization rotator part are used to receive the train of pulse of the alternately orthogonal polarization mode, and
Its polarization direction is rotated, the burst blocks of needs are ultimately formed；Wherein, burst blocks include alternate first polarization mode
The train of pulse of the train of pulse of formula and the second polarization mode.
A kind of specific structure of pulse series generator part is further provided, the pulse series generator part includes for sending out
Penetrate the oscillator of light pulse and acousto-optic modulator that the light pulse for emitting oscillator is modulated.
Further for rational driving acousto-optic modulator, the acousto-optic modulator is connected with for driving acousto-optic modulator
Arbitrary waveform generator.
Further, the first phase control device is the first fiber coupling electrooptic modulator, the second phase control
Device is the second fiber coupling electrooptic modulator.
Further for rational driving the first fiber coupling electrooptic modulator and the second fiber coupling electrooptic modulator, pulse
Dividing enlarged structure further includes binary channels arbitrary waveform generator, and the binary channels arbitrary waveform generator is respectively with described first
Fiber coupling electrooptic modulator and the second fiber coupling electrooptic modulator are connected, so as to binary channels arbitrary waveform generator drive
Move the first fiber coupling electrooptic modulator and the second fiber coupling electrooptic modulator.
Further, first amplifier channel also has the first light after the optical path of first phase control device
Fiber amplifier, the train of pulse after first phase control device enter the first fiber amplifier, form the first amplification pulse
String, second amplifier channel also have the second fiber amplifier after the optical path of second phase control device, pass through
The train of pulse crossed after second phase control device enters the second fiber amplifier, forms the second amplification train of pulse.
A kind of specific structure of polarization rational component is further provided, the polarization rational component includes reflecting mirror, four
/ mono- wave plate and 0 ° of reflecting mirror, the second amplification train of pulse is after the reflection of reflecting mirror, through polarization beam apparatus, into four
/ mono- wave plate rotates the first polarization mode of the second amplification pulse to the second polarization mode by quarter-wave plate, then
Polarization beam apparatus is reflected back through 0 ° of reflecting mirror.
Further, the polarization rotator part is half-wave plate.
Further, first polarization mode is p-polarization, and second polarization mode is s polarization, the polarization rotator
The polarization direction of the alternately train of pulse of orthogonal polarization mode is rotated 45 ° by part.
Contain in the step of the utility model additionally provides a kind of application method of pulse segmentation enlarged structure, method:
S1: the train of pulse of the first polarization mode is generated by pulse series generator part；
The train of pulse of S2: the first polarization mode is respectively sent to the first amplifier channel and the second amplifier channel is put
It handles greatly, and makes the pulse by the first amplifier channel by first phase control device and second phase control device
There is different relative phases to be distributed for string and the train of pulse for passing through the second amplifier channel；
S3: the second amplification train of pulse is received by polarization rational component, and to the polarization side of the second amplification train of pulse
To being rotated, make the second amplification train of pulse that there is the second polarization mode different from the first polarization mode；
S4: receive the first polarization mode by polarization beam apparatus first amplifies the second of train of pulse and the second polarization mode
Amplify train of pulse, and the second amplification train of pulse interference for amplifying train of pulse and the second polarization mode for the first of the first polarization mode
Superposition forms the train of pulse with alternately orthogonal polarization mode；
S5: by polarization rotator part receive it is described alternately orthogonal polarization mode train of pulse, and to its polarization direction into
Row rotation, ultimately forms the burst blocks of needs；Wherein, burst blocks include the train of pulse and of alternate first polarization mode
The train of pulse of two polarization modes.
After above-mentioned technical proposal, oscillator emission duration is the light pulse of 190ps, passes through acousto-optic modulator
Afterwards, specific polarization mode (p-polarization) and certain amount of train of pulse are exported, wherein acousto-optic modulator is by arbitrary waveform generator
(AWG) it drives；It is subsequently sent to two amplifier channels, respectively the first amplifier channel and the second amplifier channel, first
Amplifier channel includes the first fiber coupling electrooptic modulator, and the second amplifier channel includes the second fiber coupling Electro-optical Modulation
Device is driven by binary channels arbitrary waveform generator (AWG).First fiber coupling electrooptic modulator and the second fiber coupling electric light tune
Device processed is that the phase pattern of two-way laser signal is respectively set to be made of 0 and π, then respectively enters corresponding first optical fiber
Amplifier and the second fiber amplifier, by the laser signal of the second fiber amplifier after reflecting mirror, into polarization beam apparatus
(PBS), p-polarization is rotated to s and is polarized by quarter-wave plate, then through 0 ° of reflecting mirror is reflected back polarization beam apparatus, and passes through first
The laser signal orthogonal propagation of fiber amplifier closes beam through polarization beam apparatus (PBS), and the matching of two-way laser signal optical path difference can
Interference is formed, so two-way laser beam space closes beam, obtains the train of pulse of alternately cross-polarization.Using half-wave plate by pulse
After the polarization direction of string rotates 45 °, the final burst blocks for obtaining identical polarization and phase pattern with tradition DPA, i.e.,
It is made of alternate s polarized pulses and p-polarization pulse, the utility model uses two with not relative phase distribution orthogonal inclined
The interference of vibration train of pulse is superimposed to obtain set of pulses string, and its polarization mode is precisely that a series of delay lines is utilized to carry out time domain
Required polarization mode when synthesis.The train of pulse that specific polarization and phase pattern are generated using the technical solution, can pass through tune
Device processed carries out pre-shaped to train of pulse to compensate the amplitude mismatch of any number of pulse, the shadow of the subsequent synthesis of significant decrease degree
It rings；Because the phase of each pulse in train of pulse can be separately provided in the phase controlling device of the utility model, therefore can be significant
Reduce the influence that nonlinear phase mismatch generates.The final performance for improving pulse combination.It can be used for any number of light delay
Line,
Detailed description of the invention
Fig. 1 is the flow chart of the DPA method of the prior art；
Fig. 2 is that the structural schematic diagram of enlarged structure is divided in the pulse of the utility model.
Specific embodiment
In order to make the content of the utility model be easier to be clearly understood, below according to specific embodiment and combine attached
Figure, is described in further detail the utility model.
As shown in Fig. 2, enlarged structure is divided in a kind of pulse, it includes:
For generating the pulse series generator part of the train of pulse with the first polarization mode；
Amplifier channel group, amplifier channel group include the first amplifier channel and the second amplifier channel, described first
The train of pulse all the way that amplifier channel is used to export pulse series generator part amplifies, and being formed has the first polarization mode
First amplification train of pulse, the another way train of pulse that second amplifier channel is used to export pulse series generator part are put
Greatly, the second amplification train of pulse with the first polarization mode is formed, first amplifier channel has first phase controller
Part, second amplifier channel have second phase control device, the first phase control device and the second phase
It is different that control device has the train of pulse by the first amplifier channel and the train of pulse by the second amplifier channel
Relative phase distribution；
Polarization rational component, the polarization rational component amplify for receiving the second amplification train of pulse to second
The polarization direction of train of pulse is rotated, and the second amplification train of pulse is made to have the second polarization mode different from the first polarization mode
Formula；
Polarization beam apparatus 8, the polarization beam apparatus 8 are used to receive the first amplification train of pulse and second of the first polarization mode
Second amplification train of pulse of polarization mode, and amplify the second of train of pulse and the second polarization mode for the first of the first polarization mode
Amplify train of pulse interference superposition, forms the train of pulse with alternately orthogonal polarization mode；
Polarization rotator part, the polarization rotator part are used to receive the train of pulse of the alternately orthogonal polarization mode, and
Its polarization direction is rotated, the burst blocks of needs are ultimately formed；Wherein, burst blocks include alternate first polarization mode
The train of pulse of the train of pulse of formula and the second polarization mode.
As shown in Fig. 2, the pulse series generator part includes oscillator 1 for emitting light pulse and for by oscillator
The acousto-optic modulator 2 that the light pulse of 1 transmitting is modulated；Wherein, the oscillator 1 is modelocked fiber oscillator, central wavelength
1030nm, repetition rate frep=108MHz, but not limited to this, is for emission duration in the present embodiment
The light pulse of 190ps,
As shown in Fig. 2, the acousto-optic modulator 2 is connected with the arbitrary waveform generator 3 for driving acousto-optic modulator 2.
As shown in Fig. 2, the first phase control device is the first fiber coupling electrooptic modulator 41, the second phase
Control device is the second fiber coupling electrooptic modulator 42.
As shown in Fig. 2, pulse segmentation enlarged structure further includes binary channels arbitrary waveform generator 5, the binary channels is any
Waveform generator 5 is connected with the first fiber coupling electrooptic modulator 41 and the second fiber coupling electrooptic modulator 42 respectively,
So that the binary channels arbitrary waveform generator 5 drives the first fiber coupling electrooptic modulator 41 and the second fiber coupling electricity
Optical modulator 42.
As shown in Fig. 2, first amplifier channel also has after the optical path of first phase control device
One fiber amplifier 61, the train of pulse after first phase control device enter the first fiber amplifier 61, form first
Amplify train of pulse, also there is second amplifier channel the second optical fiber after the optical path of second phase control device to put
Big device 62, the train of pulse after second phase control device enter the second fiber amplifier 62, form the second amplification pulse
String.
As shown in Fig. 2, the polarization rational component includes reflecting mirror 7, quarter-wave plate 9 and 0 ° reflecting mirror 10, it is described
Second amplification train of pulse is after the reflection of reflecting mirror 7, through polarization beam apparatus 8, into quarter-wave plate 9, by four/
One wave plate 9 rotates the first polarization mode of the second amplification pulse to the second polarization mode, then is reflected back partially through 0 ° of reflecting mirror 10
Shake beam splitter 8.
As shown in Fig. 2, the polarization rotator part is half-wave plate 11.
First polarization mode is p-polarization, and second polarization mode is that s is polarized, and the polarization rotator part is by institute
The polarization direction for stating the alternately train of pulse of orthogonal polarization mode rotates 45 °.
Contain in the step of application method of pulse segmentation enlarged structure, method:
S1: the train of pulse of the first polarization mode is generated by pulse series generator part；
The train of pulse of S2: the first polarization mode is respectively sent to the first amplifier channel and the second amplifier channel is put
It handles greatly, and makes the pulse by the first amplifier channel by first phase control device and second phase control device
There is different relative phases to be distributed for string and the train of pulse for passing through the second amplifier channel；
S3: the second amplification train of pulse is received by polarization rational component, and to the polarization side of the second amplification train of pulse
To being rotated, make the second amplification train of pulse that there is the second polarization mode different from the first polarization mode；
S4: by polarization beam apparatus 8 receive the first polarization mode the first amplification train of pulse and the second polarization mode the
Two amplification trains of pulse, and the second amplification train of pulse that the first of the first polarization mode amplifies train of pulse and the second polarization mode is done
Superposition is related to, the train of pulse with alternately orthogonal polarization mode is formed；
S5: by polarization rotator part receive it is described alternately orthogonal polarization mode train of pulse, and to its polarization direction into
Row rotation, ultimately forms the burst blocks of needs；Wherein, burst blocks include the train of pulse and of alternate first polarization mode
The train of pulse of two polarization modes.
The working principle of the utility model is as follows:
1 emission duration of oscillator is the light pulse of 190ps, after acousto-optic modulator 2, exports specific polarization mode
(p-polarization) and certain amount of train of pulse, wherein acousto-optic modulator 2 is driven by arbitrary waveform generator (AWG) 3；Then it sends out
It is sent to two amplifier channels, respectively the first amplifier channel and the second amplifier channel, the first amplifier channel includes the
One fiber coupling electrooptic modulator 41, the second amplifier channel include the second fiber coupling electrooptic modulator 42, are appointed by binary channels
Waveform generator (AWG) 5 that anticipate drives.First fiber coupling electrooptic modulator 41 and the second fiber coupling electrooptic modulator 42 be by
The phase pattern of two-way laser signal is respectively set to be made of 0 and π, then respectively enters corresponding first fiber amplifier 61
With the second fiber amplifier 62.After the laser signal of the second fiber amplifier 62 is reflected by reflecting mirror 7, through polarization beam apparatus
(PBS) 8, quarter-wave plate 9 is reached, quarter-wave plate 9, which rotates p-polarization to s, to be polarized, then is reflected back through 0 ° of reflecting mirror 10
Polarization beam apparatus 8 closes beam through polarization beam apparatus (PBS) 8 with the laser signal orthogonal propagation by the first fiber amplifier 61,
The matching of two-way laser signal optical path difference, can form interference, so two-way laser beam space closes beam, obtain alternately cross-polarization
Train of pulse.After the polarization direction of train of pulse is rotated 45 ° using half-wave plate 11, final acquisition is identical with tradition DPA
The burst blocks of polarization and phase pattern, i.e., be made of alternate s polarized pulses and p-polarization pulse, and the utility model uses tool
There is the interference of two cross-polarization trains of pulse of different relative phase distributions to be superimposed to obtain set of pulses string, and its polarization mode
Required polarization mode when precisely using a series of delay lines progress time history synthesis.Specific polarization is generated using the technical solution
With the train of pulse of phase pattern, pre-shaped can be carried out to train of pulse by modulator to compensate the amplitude of any number of pulse
Mismatch, the influence of the subsequent synthesis of significant decrease degree；Because train of pulse can be separately provided in the phase controlling device of the utility model
In each pulse phase, therefore can it is significant reduce nonlinear phase mismatch generate influence.The final property for improving pulse combination
Can, and can be used for any number of optical delay line,
Particular embodiments described above, to the utility model solve the technical issues of, technical scheme and beneficial effects into
It has gone further description, it should be understood that the foregoing is merely specific embodiment of the utility model, and has not had to
In limitation the utility model, within the spirit and principle of the utility model, any modification, equivalent substitution and improvement done
Deng should be included within the scope of protection of this utility model.
Claims (9)
1. enlarged structure is divided in a kind of pulse, which is characterized in that it includes:
For generating the pulse series generator part of the train of pulse with the first polarization mode；
Amplifier channel group, amplifier channel group include the first amplifier channel and the second amplifier channel, first amplification
The train of pulse all the way that device channel is used to export pulse series generator part amplifies, and being formed has the first of the first polarization mode
Amplifying train of pulse, the another way train of pulse that second amplifier channel is used to export pulse series generator part amplifies,
The second amplification train of pulse with the first polarization mode is formed, first amplifier channel has first phase control device,
Second amplifier channel has second phase control device, the first phase control device and second phase control
It is different opposite that device has the train of pulse by the first amplifier channel and the train of pulse by the second amplifier channel
Phase distribution；
Polarization rational component, the polarization rational component amplify pulse to second for receiving the second amplification train of pulse
The polarization direction of string is rotated, and the second amplification train of pulse is made to have the second polarization mode different from the first polarization mode；
Polarization beam apparatus (8), the polarization beam apparatus (8) are used to receive the first amplification train of pulse and second of the first polarization mode
Second amplification train of pulse of polarization mode, and amplify the second of train of pulse and the second polarization mode for the first of the first polarization mode
Amplify train of pulse interference superposition, forms the train of pulse with alternately orthogonal polarization mode；
Polarization rotator part, the polarization rotator part are used to receive the train of pulse of the alternately orthogonal polarization mode, and to it
Polarization direction is rotated, and the burst blocks of needs are ultimately formed；Wherein, burst blocks include alternate first polarization mode
The train of pulse of train of pulse and the second polarization mode.
2. enlarged structure is divided in pulse according to claim 1, it is characterised in that: the pulse series generator part includes using
In the oscillator (1) for emitting light pulse and the acousto-optic modulator (2) for being used to for the light pulse that oscillator (1) emits being modulated.
3. enlarged structure is divided in pulse according to claim 2, it is characterised in that: the acousto-optic modulator (2) is connected with
For driving the arbitrary waveform generator (3) of acousto-optic modulator (2).
4. enlarged structure is divided in pulse according to claim 1, it is characterised in that: the first phase control device is the
One fiber coupling electrooptic modulator (41), the second phase control device are the second fiber coupling electrooptic modulator (42).
5. enlarged structure is divided in pulse according to claim 4, it is characterised in that: further include that binary channels random waveform occurs
Device (5), the binary channels arbitrary waveform generator (5) respectively with the first fiber coupling electrooptic modulator (41) and the second light
Fibre coupling electrooptic modulator (42) is connected, so that the binary channels arbitrary waveform generator (5) drives first fiber coupling
Electrooptic modulator (41) and the second fiber coupling electrooptic modulator (42).
6. enlarged structure is divided in pulse according to claim 1, it is characterised in that: first amplifier channel also has
The first fiber amplifier (61) after the optical path of first phase control device, after first phase control device
Train of pulse enters the first fiber amplifier (61), forms the first amplification train of pulse, second amplifier channel, which also has, to be located at
The second fiber amplifier (62) after the optical path of second phase control device, by the pulse after second phase control device
String enters the second fiber amplifier (62), forms the second amplification train of pulse.
7. enlarged structure is divided in pulse according to claim 1, it is characterised in that: the polarization rational component includes reflection
Mirror (7), quarter-wave plate (9) and 0 ° of reflecting mirror (10), described second amplifies train of pulse after the reflection of reflecting mirror (7),
It is inclined by the first of the second amplification pulse by quarter-wave plate (9) into quarter-wave plate (9) through polarization beam apparatus (8)
Vibration mode is rotated to the second polarization mode, then is reflected back polarization beam apparatus (8) through 0 ° of reflecting mirror (10).
8. enlarged structure is divided in pulse according to claim 1, it is characterised in that: the polarization rotator part is half-wave plate
(11)。
9. enlarged structure is divided in pulse according to claim 1, it is characterised in that: first polarization mode is p-polarization,
Second polarization mode be s polarization, the polarization rotator part by it is described alternately orthogonal polarization mode train of pulse polarization
Direction rotates 45 °.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108683069A (en) * | 2018-06-07 | 2018-10-19 | 上海大学 | Enlarged structure and its application method are divided in pulse |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108683069A (en) * | 2018-06-07 | 2018-10-19 | 上海大学 | Enlarged structure and its application method are divided in pulse |
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