CN109361139B - Fence pulse generating system - Google Patents

Fence pulse generating system Download PDF

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Publication number
CN109361139B
CN109361139B CN201811487197.0A CN201811487197A CN109361139B CN 109361139 B CN109361139 B CN 109361139B CN 201811487197 A CN201811487197 A CN 201811487197A CN 109361139 B CN109361139 B CN 109361139B
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optical fiber
series
beam splitter
parallel
output end
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CN109361139A (en
Inventor
饶大幸
高妍琦
崔勇
李福建
赵晓晖
季来林
刘佳
冯伟
史海涛
刘栋
单翀
曹兆栋
隋展
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Shanghai Institute Of Laser Plasma China Academy Of Engineering Physics
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Shanghai Institute Of Laser Plasma China Academy Of Engineering Physics
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10053—Phase control
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
    • H01S3/1106—Mode locking

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)

Abstract

The invention discloses a fence pulse generating system, which comprises an optical fiber mode-locked laser, a waveguide amplitude modulator and a first beam splitter, wherein the output end of the first beam splitter is respectively connected with a first narrow-band filter and a second narrow-band filter, a first optical fiber delay is connected in series on the first narrow-band filter, a first optical fiber attenuator is connected in series on the second narrow-band filter, the output end of the first optical fiber delay and the output end of the first optical fiber attenuator are connected in parallel and then are connected with the input end of a first coupler, the output end of the first coupler is connected in series with a plurality of binary system stacking units, the output end of the binary system stacking unit is respectively connected with a first optical fiber amplifier and a second optical fiber amplifier, a first N1 parallel stacking unit is connected in series on the first optical fiber amplifier, a second N1 parallel stacking unit is connected in series on the second optical fiber amplifier, and then connected in series with a beam combiner. The fence pulse of the invention can effectively inhibit the accumulation of SRS and SBS.

Description

Fence pulse generating system
Technical Field
The invention belongs to the field of high-power laser-driven Laser Plasma Interaction (LPI), and particularly relates to a fence pulse generating system which can flexibly and efficiently generate fence pulses.
Background
In high-power laser-driven Inertial Confinement Fusion (ICF), laser and plasma have strong nonlinear interaction, Stimulated Raman Scattering (SRS) and Stimulated Brillouin Scattering (SBS) are the two most important processes, laser energy is wasted, target pellet compression is asymmetric, and implosion ignition is affected. Therefore, the concern and research on how to suppress SRS and SBS in LPI and improve the beam-target coupling efficiency have been the focus of attention. In order to suppress or reduce SRS and SBS, many scientists around the world have proposed methods for smoothing the beam, such as smoothing the spectral dispersion, continuous phase plate, smoothing the polarization, etc. Through the spatial energy distribution of the uniform light beam, the laser focal spot is enabled to move rapidly on the target surface, and therefore the generation of SRS and SBS is suppressed. However, the National Ignition (NIF) device cannot achieve ignition as expected, and the light beam smoothing technology is not enough.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a barrier pulse generation system, and the adjacent sub-pulses of the barrier pulse have different wavelengths, can be shaped at will, and can flexibly adjust parameters such as the sub-pulse wavelength, the sub-pulse width, the sub-pulse interval and the like of the barrier pulse.
In order to achieve the purpose, the invention adopts the following technical scheme:
a fence pulse generation system comprises an optical fiber mode-locked laser, a waveguide amplitude modulator and a first beam splitter, wherein the output end of the optical fiber mode-locked laser is connected with the input end of the waveguide amplitude modulator, the output end of the waveguide amplitude modulator is connected with the input end of the first beam splitter, the output end of the first beam splitter is respectively connected with a first narrow-band filter and a second narrow-band filter, the first narrow-band filter and the second narrow-band filter are connected in parallel, a first optical fiber delayer is connected in series on the first narrow-band filter, a first optical fiber attenuator is connected in series on the second narrow-band filter, the output end of the first optical fiber delayer and the output end of the first optical fiber attenuator are connected in parallel and then connected with the input end of a first coupler, the output end of the first coupler is connected in series with a plurality of binary system accumulation units, and the output end of the binary system accumulation unit is respectively connected with a first optical fiber amplifier and a second optical fiber amplifier The first optical fiber amplifier and the second optical fiber amplifier are connected in parallel, a first N x 1 parallel stacking unit is connected on the first optical fiber amplifier in series, a second N x 1 parallel stacking unit is connected on the second optical fiber amplifier in series, and beam combiners are connected on the output ends of the first N x 1 parallel stacking unit and the second N x 1 parallel stacking unit in series.
Each binary stacking unit comprises a second optical fiber delayer and a second optical fiber attenuator respectively, and the second optical fiber delayer and the second optical fiber attenuator are connected in parallel and then connected in series with a second coupler.
The number of the binary pile-up units is 2-5.
The number of the binary pile-up units is 3.
The first N x 1 parallel stacking unit comprises a second beam splitter, a plurality of first delay and amplitude adjusting units are connected in parallel at the output end of the second beam splitter, and the number of the delay and amplitude adjusting units is the same as that of the second beam splitter.
The first delay and amplitude adjusting unit comprises a third optical fiber delay and a third optical fiber attenuator, and the third optical fiber delay and the third optical fiber attenuator are connected in series.
The second N x 1 parallel stacking unit comprises a third beam splitter, a plurality of second delay and amplitude adjusting units are connected in parallel at the output end of the third beam splitter, and the number of the second delay and amplitude adjusting units is the same as that of the third beam splitter.
The second delay and amplitude adjusting unit comprises a fourth optical fiber delay and a fourth optical fiber attenuator, and the fourth optical fiber delay and the fourth optical fiber attenuator are connected in series.
The first beam splitter is a 1 x 2 beam splitter.
The first coupler is a 2 x 2 coupler.
Compared with the prior art, the invention has the beneficial effects that:
1) different wavelengths are presented between adjacent sub-pulses of the barrier pulse; 2) the fence pulse can be subjected to any time waveform shaping; 3) parameters such as the sub-pulse wavelength of the barrier pulse, the width of the sub-pulse, the interval of the sub-pulse and the like can be flexibly adjusted; 4) can realize full optical fiber and has compact structure. The fence pulse of the invention can effectively inhibit the accumulation of SRS and SBS.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of the overall structure of the present invention.
FIG. 2 is a diagram of outputting barrier pulses according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, the barrier pulse generating system of this embodiment includes an optical fiber mode-locked laser 1, a waveguide amplitude modulator 2 and a first beam splitter 3, an output end of the optical fiber mode-locked laser 1 is connected to an input end of the waveguide amplitude modulator 2, an output end of the waveguide amplitude modulator 2 is connected to an input end of the first beam splitter 3, signal light is divided into two paths and respectively connected to the narrow band filters, an output end of the first beam splitter 3 is respectively connected to a first narrow band filter 4 and a second narrow band filter 5, bandwidths of the first narrow band filter 4 and the second narrow band filter 5 may be different, and adjacent sub-pulses may present different wavelengths; the first narrow-band filter 4 and the second narrow-band filter 5 are connected in parallel, a first optical fiber delay 6 is connected in series on the first narrow-band filter 4, a first optical fiber attenuator 7 is connected in series on the second narrow-band filter 5, the optical fiber delay is used for adjusting the delay between two paths of pulses, and the optical fiber attenuator is used for adjusting the pulse amplitude and realizing pulse shaping; the output end of the first optical fiber retarder 6 and the output end of the first optical fiber attenuator 7 are connected in parallel and then connected with the input end of the first coupler 8, the output end of the first coupler 8 is connected with a plurality of binary stacking units 9 in series, the output end of the binary stacking unit 9 is connected with a first optical fiber amplifier 10 and a second optical fiber amplifier 11 respectively, the first optical fiber amplifier 10 and the second optical fiber amplifier 11 are connected in parallel, a first N x 1 parallel stacking unit 12 is connected on the first optical fiber amplifier 10 in series, a second N x 1 parallel stacking unit 13 is connected on the second optical fiber amplifier 11 in series, and a beam combiner 14 is connected on the output ends of the first N x 1 parallel stacking unit 12 and the second N x 1 parallel stacking unit 13 in series.
Preferably, each binary stacking unit 9 of the present embodiment comprises a second fiber delay 15 and a second fiber attenuator 16 respectively, and the second fiber delay 15 and the second fiber attenuator 16 are connected in parallel and then connected in series with a second coupler 17.
As a further preference, the number of the binary stacking units 9 in this embodiment is 3, a plurality of binary stacking units can be added as needed, 2, 5, etc. can be selected, and the stacking realizes the required pulse width;
as a further preference, the first N × 1 parallel stacking unit 12 of the present embodiment includes a second beam splitter 18, and a plurality of first delay and amplitude adjusting units 19 are connected in parallel to the output end of the second beam splitter 18, and the number of the delay and amplitude adjusting units 19 is the same as the number of the beams split by the second beam splitter 18.
As a further preference, the first delay and amplitude adjustment unit 19 of this embodiment includes a third fiber delay 20 and a third fiber attenuator 21, and the third fiber delay 20 and the third fiber attenuator 21 are connected in series.
As a further preference, the second N × 1 parallel stacking unit 13 of this embodiment includes a third beam splitter 22, a plurality of second delay and amplitude adjusting units 23 are connected in parallel to the output end of the third beam splitter 22, and the number of the second delay and amplitude adjusting units 23 is the same as the number of the beams split by the third beam splitter 22.
As a further preference, the second delay and amplitude adjustment unit 23 of this embodiment includes a fourth optical fiber delay 24 and a fourth optical fiber attenuator 25, and the fourth optical fiber delay 24 and the fourth optical fiber attenuator 25 are connected in series.
As a further preference, the first beam splitter 3 of the present embodiment is a 1 × 2 beam splitter; the first coupler 8 is a 2 x 2 coupler.
In this embodiment: the adopted optical fiber mode-locked laser 1 is an optical fiber mode-locked laser with the center wavelength of 1053nm and chirp, the center wavelengths of the first narrow-band filter 4 and the second narrow-band filter 5 are 1052.5nm and 1053.5nm respectively, the bandwidths are 0.9nm, the adjusting precision of the first optical fiber delayer, the second optical fiber delayer and the third optical fiber delayer is 0.5ps, and the devices are all connected by single-mode polarization-maintaining optical fibers.
The working process of the embodiment is as follows:
the output pulse of the optical fiber mode-locked laser 1 is subjected to frequency reduction by the waveguide amplitude modulator 2, then is divided into two paths by the 1 × 2 first beam splitter 3, and then is respectively connected with the first narrow band filter 4 and the second narrow band filter 5, the laser pulse width is adjusted to 8ps, the two paths of pulse delay are adjusted to 8ps by the first optical fiber delay 6, the pulse amplitude is adjusted by the first optical fiber attenuator 7 according to the requirement, the two paths of adjusted pulses are accumulated by the 2 × 2 first coupler 8, the pulse width is changed to 16ps, the pulse is divided into two paths by the 2 × 2 first coupler 8 and then passes through the second optical fiber delay 15 and the second optical fiber attenuator 16 respectively, as above, the two paths of pulse delay are adjusted to 16ps by the second optical fiber delay 15, the pulse amplitude is adjusted according to the requirement by the second optical fiber attenuator 16, the two paths of adjusted pulses are accumulated by the 2 × 2 second coupler 17, the pulse width is changed to 32ps, similarly, the above operations are repeated, the pulse width can be accumulated to 128ps, the waveform distribution can be arbitrarily adjusted by the optical fiber attenuator according to needs, then the two paths are divided by the 2 x 2 coupler in the binary accumulation unit 9, energy compensation is performed by the first optical fiber amplifier 10 and the second optical fiber amplifier 11 respectively, the two paths of pulses respectively pass through the 1 x 4 second beam splitter 18 and the 1 x 4 third beam splitter 22, 8 paths of pulses with the pulse width of 128ps are output, each path of pulses passes through the optical fiber delay and the optical fiber attenuator, the delay amount of the optical fiber delay is adjusted, so that the delay amount of the two adjacent paths of pulses is 128ps, finally, the 8 paths of pulses are accumulated to pulses with the pulse width of 1024ps by the 8 x 1 beam combiner 14, the time distribution of the pulses can be arbitrarily adjusted by the optical fiber attenuator according to needs, and the output pulse schematic diagram is shown in fig. 2.
Although the present invention has been described in detail with respect to the above embodiments, it will be understood by those skilled in the art that modifications or improvements based on the disclosure of the present invention may be made without departing from the spirit and scope of the invention, and these modifications and improvements are within the spirit and scope of the invention.

Claims (3)

1. A fence pulse generation system is characterized by comprising an optical fiber mode-locked laser (1), a waveguide amplitude modulator (2) and a first beam splitter (3), wherein the output end of the optical fiber mode-locked laser (1) is connected with the input end of the waveguide amplitude modulator (2), the output end of the waveguide amplitude modulator (2) is connected with the input end of the first beam splitter (3), the output end of the first beam splitter (3) is respectively connected with a first narrow-band filter (4) and a second narrow-band filter (5), the first narrow-band filter (4) is connected with the second narrow-band filter (5) in parallel, a first optical fiber delay (6) is connected with the first narrow-band filter (4) in series, a first optical fiber attenuator (7) is connected with the second narrow-band filter (5) in series, and the output end of the first optical fiber delay (6) and the output end of the first optical attenuator (7) are connected with a first coupler (8) in parallel The output end of the first coupler (8) is connected with a plurality of binary stacking units (9) in series, the output end of the binary stacking units (9) is respectively connected with a first optical fiber amplifier (10) and a second optical fiber amplifier (11), the first optical fiber amplifier (10) and the second optical fiber amplifier (11) are connected in parallel, a first N1 parallel stacking unit (12) is connected on the first optical fiber amplifier (10) in series, a second N1 parallel stacking unit (13) is connected on the second optical fiber amplifier (11) in series, and a beam combiner (14) is connected on the output ends of the first N1 parallel stacking unit (12) and the second N1 parallel stacking unit (13) in series; each binary stacking unit (9) comprises a second optical fiber delayer (15) and a second optical fiber attenuator (16), the second optical fiber delayers (15) and the second optical fiber attenuators (16) are connected in parallel and then connected in series with a second coupler (17), the number of the binary stacking units (9) is 2-5, the number of the binary stacking units (9) is 3, the first N1 parallel stacking unit (12) comprises a second beam splitter (18), a plurality of first delay and amplitude adjusting units (19) are connected in parallel at the output end of the second beam splitter (18), the number of the delay and amplitude adjusting units (19) is the same as that of the beams split by the second beam splitter (18), and the first delay and amplitude adjusting units (19) comprise a third optical fiber delayer (20) and a third optical fiber attenuator (21), the third optical fiber delayer (20) and the third optical fiber attenuator (21) are connected in series; the second N x 1 parallel stacking unit (13) comprises a third beam splitter (22), a plurality of second delay and amplitude adjusting units (23) are connected in parallel at the output end of the third beam splitter (22), the number of the second delay and amplitude adjusting units (23) is the same as that of the beams split by the third beam splitter (22), the second delay and amplitude adjusting units (23) comprise fourth optical fiber retarders (24) and fourth optical fiber attenuators (25), and the fourth optical fiber retarders (24) and the fourth optical fiber attenuators (25) are connected in series.
2. A fence pulse generating system as claimed in claim 1 wherein said first beam splitter (3) is a 1 x 2 beam splitter.
3. A fence pulse generating system as claimed in claim 1 wherein said first coupler (8) is a 2 x 2 coupler.
CN201811487197.0A 2018-12-06 2018-12-06 Fence pulse generating system Active CN109361139B (en)

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Citations (3)

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US6137604A (en) * 1996-12-04 2000-10-24 Tyco Submarine Systems, Ltd. Chromatic dispersion compensation in wavelength division multiplexed optical transmission systems
CN103023531A (en) * 2012-11-22 2013-04-03 湖南大学 Full-gloss ultra wide band pulse generation method based on semiconductor light amplifier and light time delay line
CN103809346A (en) * 2014-02-26 2014-05-21 上海交通大学 Ultra high-speed optical analog-to-digital conversion device

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US6937626B2 (en) * 2002-05-10 2005-08-30 The United States Of America As Represented By The Secretary Of The Navy Multiple wavelength pulsed source
JP2004279589A (en) * 2003-03-13 2004-10-07 Fujitsu Ltd Method and device for developing multiple wavelength light source
WO2011109753A1 (en) * 2010-03-05 2011-09-09 TeraDiode, Inc. Wavelength beam combining based pump / pulsed lasers

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6137604A (en) * 1996-12-04 2000-10-24 Tyco Submarine Systems, Ltd. Chromatic dispersion compensation in wavelength division multiplexed optical transmission systems
CN103023531A (en) * 2012-11-22 2013-04-03 湖南大学 Full-gloss ultra wide band pulse generation method based on semiconductor light amplifier and light time delay line
CN103809346A (en) * 2014-02-26 2014-05-21 上海交通大学 Ultra high-speed optical analog-to-digital conversion device

Non-Patent Citations (1)

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栅栏脉冲;隋展;《中国博士学位论文全文数据库 信息科技辑》;20070815(第2（2007）期);第2.4、4.2.2节 *

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