CN106654838A - Laser pulse peak inhibition method and device based on stimulated Raman scattering - Google Patents
Laser pulse peak inhibition method and device based on stimulated Raman scattering Download PDFInfo
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- CN106654838A CN106654838A CN201510431310.3A CN201510431310A CN106654838A CN 106654838 A CN106654838 A CN 106654838A CN 201510431310 A CN201510431310 A CN 201510431310A CN 106654838 A CN106654838 A CN 106654838A
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- stimulated raman
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Abstract
The invention relates to a laser pulse peak inhibition method and device based on stimulated Raman scattering, so as to eliminate the pulse peak in a laser pulse. The method comprises the steps: S1, enabling the laser pulse to be coupled to a Raman medium, and enabling the pulse peak in the laser pulse to perform stimulated Raman scattering; S2, carrying out the filtering of the laser pulse outputted by the Raman medium, and filtering out the pulse peak which performs the stimulated Raman scattering. The method enables the pulse peak in the laser pulse to perform stimulated Raman scattering, thereby achieving the wavelength red shift of the pulse peak because of the stimulated Raman scattering. Therefore, the pulse peak and a main laser pulse have different wavelengths. Afterwards, the method carries out the filtering of the laser pulse passing through the Raman medium according to the difference between the wavelengths, enables the pulse peak to be filtered out, and obtains the main laser pulse. Because the method does not need to change the performance of a laser or an amplifier, the implementation process is simple and convenient and the cost is lower, the method is universal.
Description
Technical field
It is the present invention relates to optics and laser optoelectronic technical field more particularly to a kind of based on being excited
The suppression method of laser pulse spike of Raman scattering and a kind of laser based on stimulated Raman scattering
Pulse spike restraining device.
Background technology
Optical fiber laser is because of its efficiency high, threshold value is low, beam quality is high, compact compact and sexual valence
Common concern is subject to than high numerous good characteristics, and has obtained tremendous development.In recent years,
High peak power pulse fiber amplifier also shows in the field such as military, medical treatment and industrial processes
Wide application prospect.With optical fiber laser or high peak power pulse fiber amplifier institute it is defeated
The continuous amplification of the light pulse for going out, gain saturaition can all the more significantly, and optical pulse waveform can go out
Existing steep front, i.e. forward position spike.
Because forward position spike or other pulse spikes are with higher peak power, therefore easily
Cause various nonlinear effects, so as to clamp down on the further amplification of light pulse.
The content of the invention
The technical problem to be solved is：How to suppress or filter the arteries and veins in laser pulse
Rush spike.
To solve above-mentioned technical problem, the present invention proposes a kind of swashing based on stimulated Raman scattering
Light pulse peak suppression method.The method includes：
S1, laser pulse is coupled into Raman medium, makes the pulse point in the laser pulse
There is stimulated Raman scattering in peak；
S2, the laser pulse to Raman medium output are filtered, and excited Raman will occur
The pulse spike of scattering is filtered.
Further, the Raman medium is chosen according to stimulated Raman scattering threshold value；It is described to be excited
Raman scattering threshold value is determined by the light intensity of major light pulse and pulse spike in the laser pulse.
Preferably, the Raman medium is optical fiber.
To solve above-mentioned technical problem, the invention allows for a kind of based on stimulated Raman scattering
Laser pulse spike restraining device.The device includes：
Raman medium, for making laser pulse in pulse spike occur stimulated Raman scattering；
Optical filter, is connected to the Raman medium, for the laser arteries and veins for exporting in Raman medium
Pulse spike in punching is filtered.
Preferably, the Raman medium is optical fiber.
The present invention makes pulse spike in laser pulse that stimulated Raman scattering to occur, pulse spike because
Generation stimulated Raman scattering and red shift of wavelength, therefore pulse spike and major light pulse are provided with difference
Wavelength.Then according to the difference of wavelength, the laser pulse through Raman medium is filtered,
Pulse spike is filtered, so as to obtain major light pulse.Due to the pulse spike suppression side of the present invention
Method need not change the performance of laser instrument or amplifier itself, and implementation process is simple, convenient, and
And cost is relatively low, therefore with universality.
Description of the drawings
The features and advantages of the present invention can be more clearly understood from by reference to accompanying drawing, accompanying drawing is to show
Meaning property and should not be construed as carrying out the present invention any restriction, in the accompanying drawings：
Fig. 1 shows the laser pulse spike suppression side according to the present invention based on stimulated Raman scattering
The schematic flow sheet of the embodiment of method one；
Fig. 2 shows that the laser pulse spike according to the present invention based on stimulated Raman scattering suppresses dress
Put the structural representation of one embodiment；
Fig. 3 shows a kind of waveform of the laser pulse for causing pulse spike because of gain saturaition
Figure；
Fig. 4 shows laser pulse spike restraining device pair of the present invention based on stimulated Raman scattering
Laser pulse in Fig. 3 processed after laser pulse oscillogram.
Specific embodiment
Below in conjunction with accompanying drawing, embodiments of the present invention is described in detail.
The present invention provides a kind of suppression method of laser pulse spike based on stimulated Raman scattering, such as
Shown in Fig. 1, the method includes：
S1, laser pulse is coupled into Raman medium, makes the pulse spike in the laser pulse
Generation stimulated Raman scattering；
S2, the laser pulse to Raman medium output are filtered, and excited Raman will occur
The pulse spike of scattering is filtered.
Because there is stimulated Raman scattering, arteries and veins in Raman medium in the pulse spike in laser pulse
Spike is rushed because there is stimulated Raman scattering and red shift of wavelength, therefore pulse spike and major light pulse tool
There are different wavelength.Then according to the difference of wavelength, to the laser pulse through Raman medium
It is filtered, pulse spike is filtered, so as to obtains major light pulse.Due to the pulse of the present invention
Peak suppression method need not change the performance of laser instrument or amplifier itself, implementation process letter
Single, convenience, and cost is relatively low, therefore with universality.
Raman medium can be, but not limited to optical fiber, voluntarily select in specific implementation process.
In the specific implementation process of such scheme, Raman medium can be according to stimulated Raman scattering
Threshold value is chosen.Wherein, the stimulated Raman scattering threshold value is by key light in the laser pulse
The light intensity of pulse and pulse spike determines.
Wherein, stimulated Raman scattering threshold value, refers to the critical condition of stimulated Raman scattering.
That is light intensity will occur stimulated Raman scattering, and light intensity less than the threshold value higher than the threshold value,
Stimulated Raman scattering would not occur.Because major light pulse and pulse spike have different light
By force, and pulse spike light intensity it is larger, therefore stimulated Raman scattering threshold value is generally larger than key light
The light intensity of pulse, and it is less than the light intensity of pulse spike.
The species of Raman medium and the parameter of correlation can be chosen according to stimulated Raman scattering threshold value.If
The species of selected Raman medium is optical fiber, also needs to choose optical fiber mode according to stimulated Raman scattering threshold value
The optical fiber of the parameter matching such as field size, fiber lengths, so as to eliminate pulse spike.
In addition, laser pulse can be sent by light impulse source.
Present invention also offers a kind of laser pulse spike based on stimulated Raman scattering suppresses dress
Put, as shown in Fig. 2 the device includes：
Raman medium 2, for making laser pulse in pulse spike occur stimulated Raman scattering；
Optical filter 3, is connected to the Raman medium, for the laser for exporting in Raman medium
Pulse spike in pulse is filtered.
Mark 1 in Fig. 2 represents laser pulse source, and mark 4 is represented after optical filter 3 is filtered
The major light pulse for obtaining.
There is stimulated Raman scattering in pulse spike, pulse spike is because being excited in Raman medium
Raman scattering and red shift of wavelength, i.e., after Raman medium, the wavelength of pulse spike is elongated.And
Because not there is stimulated Raman scattering, its wavelength is not changed in major light pulse.Therefore pulse spike
Difference is produced with the wavelength of major light pulse, like this, just can be by pulse using optical filter
Spike and major light pulse are separated, and then pulse spike is filtered, and major light pulse is retained, complete
The suppression of paired pulse spike.
The restraining device can just complete pulse spike only with Raman medium and optical filter
Suppress work, the restraining device have simple structure, easy to use, inhibition it is good, investment
Low cost and other advantages, with universality.
Wherein, Raman medium can be, but not limited to optical fiber.
Wherein, optical filter can be all -fiber formula, or spatial.
As shown in Fig. 2 the laser pulse exported by optical filter can be connect by photodetector 5
Receive, the laser pulse after reception can be shown by oscillograph 6, so as to carry out to its waveform
Observation.
Fig. 3 is a kind of laser pulse shape figure for causing pulse spike because of gain saturaition, from
As can be seen that the pulse spike in the laser pulse is forward position spike in the figure.Fig. 4 is utilization
The present invention restraining device the laser pulse in Fig. 3 is processed after oscillogram, it is seen that arteries and veins
Rush spike to be suppressed well.
Although being described in conjunction with the accompanying embodiments of the present invention, those skilled in the art can
To make various modifications and variations without departing from the spirit and scope of the present invention, so
Modification and within the scope of modification each falls within and is defined by the appended claims.
Claims (5)
1. a kind of suppression method of laser pulse spike based on stimulated Raman scattering, its feature exists
In, including：
S1, laser pulse is coupled into Raman medium, makes the pulse spike in the laser pulse
Generation stimulated Raman scattering；
S2, the laser pulse to Raman medium output are filtered, and excited Raman will occur
The pulse spike of scattering is filtered.
2. method according to claim 1, it is characterised in that the Raman medium according to
Stimulated Raman scattering threshold value is chosen；The stimulated Raman scattering threshold value is by main in the laser pulse
The light intensity of light pulse and pulse spike determines.
3. method according to claim 1 and 2, it is characterised in that the Raman medium
For optical fiber.
4. a kind of laser pulse spike restraining device based on stimulated Raman scattering, its feature exists
In, including：
Raman medium, for making laser pulse in pulse spike occur stimulated Raman scattering；
Optical filter, is connected to the Raman medium, for the laser arteries and veins for exporting in Raman medium
Pulse spike in punching is filtered.
5. device according to claim 1, it is characterised in that the Raman medium is light
It is fine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510431310.3A CN106654838B (en) | 2015-07-21 | 2015-07-21 | Suppression method of laser pulse spike and device based on stimulated Raman scattering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510431310.3A CN106654838B (en) | 2015-07-21 | 2015-07-21 | Suppression method of laser pulse spike and device based on stimulated Raman scattering |
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| Publication Number | Publication Date |
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| CN106654838A true CN106654838A (en) | 2017-05-10 |
| CN106654838B CN106654838B (en) | 2019-04-05 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6181463B1 (en) * | 1997-03-21 | 2001-01-30 | Imra America, Inc. | Quasi-phase-matched parametric chirped pulse amplification systems |
| CN1714313A (en) * | 2002-11-21 | 2005-12-28 | 古河电气工业株式会社 | Light source in optical transmission system, waveform shaper, optical pulse train generator, and optical reproduction system |
| CN102110949A (en) * | 2009-12-23 | 2011-06-29 | 清华大学 | Suppression method of laser pulse spike |
| CN103329016A (en) * | 2011-01-27 | 2013-09-25 | Imra美国公司 | Methods and systems for fiber delivery of high peak power optical pulses |
-
2015
- 2015-07-21 CN CN201510431310.3A patent/CN106654838B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6181463B1 (en) * | 1997-03-21 | 2001-01-30 | Imra America, Inc. | Quasi-phase-matched parametric chirped pulse amplification systems |
| CN1714313A (en) * | 2002-11-21 | 2005-12-28 | 古河电气工业株式会社 | Light source in optical transmission system, waveform shaper, optical pulse train generator, and optical reproduction system |
| CN102110949A (en) * | 2009-12-23 | 2011-06-29 | 清华大学 | Suppression method of laser pulse spike |
| CN103329016A (en) * | 2011-01-27 | 2013-09-25 | Imra美国公司 | Methods and systems for fiber delivery of high peak power optical pulses |
Non-Patent Citations (1)
| Title |
|---|
| J. KIM 等: ""Suppression of stimulated Raman scattering in a high power Yb-doped fiber amplifier using a W-type core with fundamental mode cut-off"", 《OPTICS EXPRESS》 * |
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| CN106654838B (en) | 2019-04-05 |
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