CN102608828B - Utilize the apparatus and method of electrooptical effect suppressor pulse laser beam stimulated Brillouin scattering - Google Patents
Utilize the apparatus and method of electrooptical effect suppressor pulse laser beam stimulated Brillouin scattering Download PDFInfo
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- CN102608828B CN102608828B CN201210082476.5A CN201210082476A CN102608828B CN 102608828 B CN102608828 B CN 102608828B CN 201210082476 A CN201210082476 A CN 201210082476A CN 102608828 B CN102608828 B CN 102608828B
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Abstract
A kind of device utilizing electro-optical medium to suppress stimulated Brillouin scattering, it is characterized in that: comprise electro-optical medium, linearly polarized laser device, when the linearly polarized laser that linearly polarized laser device sends is by described electro-optical medium, voltage cycle be applied on electro-optical medium, periodically to change the polarization state of described linearly polarized laser, it is characterized in that: pulse laser beam is through after described electro-optical medium, and orthogonal two polarization states occupy the half of pulse laser beam pulse length separately.
Description
Technical field
The present invention relates to stimulated Brillouin scattering, belong to photoelectron technical field.
Background technology
Stimulated Brillouin scattering belongs to technology known in the art, be widely used in phase conjugation to compensate, laser acquisition, and the field such as optical communication, requirement in different applications for the scattering of excited Brillouin is also different, the stimulated Brillouin scattering signal of high strength is generally all needed in the application that laser acquisition and phase conjugation compensate, generally now all amplify stimulated Brillouin scattering signal as much as possible to obtain best effect, but in some field of optical communication etc., be then the intensity needing to control stimulated Brillouin scattering, namely not the generation of the maximum stimulated Brillouin scattering of simple pursuit yet, then the generation wishing to suppress stimulated Brillouin scattering in yet some other cases, because the stimulated Brillouin scattering signal occurred may produce destructive influences to the medium wherein transmitted, or noise can be increased in the signal of transmission, in the face of such technical matters, there has been proposed the method and apparatus of various control or suppression stimulated Brillouin scattering signal intensity, the method that suppression stimulated Brillouin scattering of the prior art occurs has a variety of, wherein Chinese patent application CN201010602572.9 proposes one and utilizes stimulated Brillouin scattering restraining device, its bag electro-optical medium, linearly polarized laser device, when the linearly polarized laser that linearly polarized laser device sends is by described electro-optical medium, voltage cycle be applied to electro-optical medium, periodically to change the polarization state of described linearly polarized laser.Namely this laser beam with the change of periodic polarization state is provided with stimulated Brillouin scattering inhibiting effect, certain inhibiting effect can be played to stimulated Brillouin scattering wherein when such laser beam is propagated in media as well, it is mathematical that the method has certain inhibiting effect for Brillouin scattering, but this application realizes suppressing preferably but not propose for specific laser beam, such as, for pulse laser beam, as long as although make laser beam have orthogonal polarization state on front and back position can realize certain inhibiting effect, but how realizing good inhibiting effect is but unknown to those skilled in the art, the present invention puts forward for this problem.
Summary of the invention
The present invention solves above-mentioned technical matters to propose a kind of method and apparatus utilizing electrooptical effect to suppress stimulated Brillouin scattering, uses the method and device can realize for the good inhibiting effect of pulse laser beam.
Under regard to principle of work of the present invention and be described in detail, wherein Fig. 1 and Fig. 2 shows the stimulated Brillouin scattering restraining device in Chinese patent application 201010602572.9.As shown in Figure 1, linearly polarized laser device 101, electro-optical medium 102, and power supply 103, it is characterized in that, electro-optical medium is in the outside of linearly polarized laser device 101, and the linearly polarized laser that linearly polarized laser device 101 sends is through electro-optical medium 102, power supply 103 periodically applies voltage for electro-optical medium 102, and wherein applied voltage is half-wave voltage.Two electro-optical mediums 203 and 205 are included in embodiment shown in Fig. 2, if laser instrument 101 is pulsed laser, to laser instrument 101 launch laser beam after electro-optical medium, so the polarization state of laser beam will be become two kinds of polarization states from original single linear polarization, according to applied voltage time, the pulse laser beam of linear polarization is through the situation that roughly there will be after electro-optical medium as Fig. 3 a-3h.
First Fig. 3 a and 3b, when electro-optical medium is in halted state, through after electro-optical medium, it still keeps single linear polarization to laser beam, or be S polarization, or be P polarization, namely also namely in whole pulse length, only have S polarization or P polarization, when laser beam is now transmitted in media as well, the signal intensity of excited Brillouin is maximum, and also electro-optical medium does not produce effect for the stimulated Brillouin scattering of laser beam.
Then Fig. 3 c and 3d, in whole pulse length, the polarization state of the laser beam of a seldom part is only had to be changed, conceivablely be, laser beam now through electro-optical medium just serves certain effect for stimulated Brillouin scattering, because at least on that of end-of-pulsing is a bit of, polarization state is orthogonal with part above, situation shown in Fig. 3 c and Fig. 3 d is relative to the situation shown in Fig. 3 a and Fig. 3 b, be provided with the inhibiting effect of stimulated Brillouin scattering, but, be appreciated that its inhibiting effect is certainly not the strongest.
Fig. 3 e and Fig. 3 f again, wherein a kind of polarization state occupies 1/3rd of whole pulse length, another polarization state occupies 2/3rds of whole pulse length, the polarization state that both differences are just to occupy whole pulse length 2/3rds is continuous distribution or spaced apart, Fig. 3 e is continuous distribution, Fig. 3 f is spaced apart, and shown by the conceivable Fig. 3 of being e and Fig. 3 f, the inhibition of situation is better than the inhibition of Fig. 3 c and Fig. 3 d.
Saw Fig. 3 g and Fig. 3 h the most afterwards, in these two figure, any one polarization state all occupies the half of whole pulse length, also namely whole pulse length by two kinds of orthogonal polarization state averaged occupations, difference is that one is the half occupying pulse continuously, another one is the half occupying pulse in the mode of interleaved, and so problem has also just been come, now inhibition shown by Fig. 3 g and Fig. 3 h compare with the inhibition shown by Fig. 3 f than Fig. 3 e good or bad.
In order to solve the above problems, we prior theory are analyzed stimulated Brillouin scattering.We know, the signal intensity of stimulated Brillouin optical
wherein I
srepresent the signal intensity of stimulated Brillouin scattering light, I
prepresent incident laser beam intensity, g
0represent stimulated Brillouin scattering gain coefficient, l represents the interaction length between stimulated Brillouin scattering light and the laser of incidence.
For general nanosecond and femtosecond or picosecond laser, what its pulse length was the longest should be nanosecond laser, for the laser beam of several nanosecond pulse length, its pulse length had is about about 2 meters (for the transmission mediums such as optical fiber or water), so wherein the longest interaction length is the half of pulse length, also about 1 meter is, in this length or shorter distance, for optical transmission medium usually used, the decay of laser beam can be ignored, also namely think I
pbe a constant, stimulated Brillouin scattering gain coefficient g
0only relevant with the material behavior of Laser Transmission medium, it is a constant, and we suppose that the length occupied by S (or P) polarization state is x, and so the actual interaction length of this polarization state should be
and the length occupied by P (or S) polarization state should be just
the interaction length of its reality is
wherein c represents the light velocity, and n represents that the medium refraction index that laser beam is propagated, T are the pulse width of pulse laser beam wherein, and so the stimulated Brillouin scattering light that produces in media as well of this pulse laser beam is strong
wherein I
ssrepresent total stimulated Brillouin scattering intensity that intrafascicular two polarization states of this pulse laser (P polarization and S polarization state) produce,
represent that the stimulated Brillouin scattering light that S (or P) polarization state produces is strong,
represent that the stimulated Brillouin scattering light that P (or S) polarization state produces is strong, to I
ssdifferentiate obtains extreme value and can obtain, when
time pulse laser beam total excited Brillouin light intensity of producing obtain extreme value, can obtain this extreme value according to analysis above should be minimum value, so can draw such conclusion, the half occupying whole pulse length when a kind of polarization state (S or P polarization state) can obtain best inhibition, is also Fig. 3 g and the situation shown by Fig. 3 h.What the laser beam also namely with this polarization state structure was transmitted in media as well can suppress stimulated Brillouin scattering preferably.
The present invention includes:
A kind of device utilizing electro-optical medium suppressor pulse laser stimulated Brillouin scattering, it is characterized in that: comprise electro-optical medium, taps polarization laser, when the taps polarization laser that taps polarization laser sends is by described electro-optical medium, voltage cycle be applied on electro-optical medium, periodically to change the polarization state of described taps polarization laser, it is characterized in that: taps polarized laser beam is through after described electro-optical medium, orthogonal two linear polarization occupy the half of pulse laser beam pulse length separately, namely stimulated Brillouin scattering inhibit feature is provided with through the pulse laser beam after electro-optical medium.
According to one of them embodiment, the wherein said half occupying pulse length is separately the half that each polarization state continuous print occupies pulse length.
According to one of them embodiment, the wherein said half occupying pulse length is separately two orthogonal polarization states occupy pulse length separately half in the mode be alternately arranged.
A kind of method utilizing electro-optical medium suppressor pulse laser stimulated Brillouin scattering, periodically voltage is applied to electro-optical medium, described electro-optical medium periodically changes the polarization state of the taps polarized laser beam through described electro-optical medium, it is characterized in that: taps polarized laser beam is through after described electro-optical medium, orthogonal two linear polarization occupy the half of pulse laser beam pulse length separately, are namely provided with stimulated Brillouin scattering inhibit feature through the pulse laser beam after electro-optical medium.
According to one of them embodiment, the wherein said half occupying pulse length is separately the half that each polarization state continuous print occupies pulse length.
According to one of them embodiment, the wherein said half occupying pulse length is separately two orthogonal polarization states occupy pulse length separately half in the mode be alternately arranged.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of stimulated Brillouin scattering restraining device in prior art;
Fig. 2 is an other embodiment schematic diagram in prior art.
Fig. 3 a-3h is the schematic diagram that in the present invention, two kinds of polarization states (S and P) occupy different distance in the length of pulse laser beam.
Embodiment
By analysis above, we can obtain, in order to obtain the inhibition of good stimulated Brillouin scattering in the whole pulse length of laser beam, what needs were accomplished is exactly make pulse laser beam in the half being pulse laser beam length through the length occupied by orthogonal two polarization states after electro-optical medium.
The half of pulse laser beam length is occupied separately, as long as execute the alive time can realize by controlling electro-optical medium in order to realize two orthogonal polarization states.
This realization comprises two kinds of modes, one carries out accurate synchro control by controller (such as digital delay generator) to the outgoing time of laser beam with to electro-optical medium applying voltage time, also namely when half pulse before pulse laser beam is by electro-optical medium, electro-optical medium there is no voltage (or there is voltage), and when rear half pulse of pulse laser beam is by electro-optical medium, electro-optical medium then has voltage (or not having voltage), also namely half pulse in front and back of pulse laser beam is antipodal by the voltage status on electro-optical medium during electro-optical medium, so both can realize the situation shown by Fig. 3 g, each polarization state is all the half occupying pulse length continuously.For this situation, slightly more complex in control, but the benefit brought also is apparent, because in this fashion, the polarization state of pulse laser beam is not through changing frequently, substantially can not the application of paired pulses laser beam have an impact, because the polarization state that can not change laser beam too frequently may be required in some applications.
Another mode is the voltage status by changing frequently on electro-optical medium, also the time namely having voltage in each cycle is the same with not having the time of voltage, also namely the dutycycle of voltage is 1: 1, require to execute the alive time very short simultaneously at every turn, as long as execute the alive time and do not execute the alive time all very short at every turn, the polarization state of the change pulse laser beam of high frequency could being realized, in order to improve frequency, the electro-optical medium that two or more cooperatively interact can be used.Make in this way, only need at pulse laser beam through before electro-optical medium, electro-optical medium is in running order, this mode can realize the situation shown by Fig. 3 h, and the benefit of this mode is exactly do not need accurately to control to execute the alive time, and does not also need the outgoing time of coordinating laser beam, relatively simple in control, but the problem brought also clearly, that is to say the polarization state needing to change laser beam frequently, this may cause cannot using in some applications.
Use which kind of mode in the middle of actual, then need to require according to the application of laser beam and be controlled to originally to select.
Claims (1)
1. the method utilizing electro-optical medium to suppress several ps pulsed laser and ns pulsed laser stimulated Brillouin scattering, periodically for electro-optical medium applies voltage, described electro-optical medium periodically changes the polarization state of the taps polarized laser beam through described electro-optical medium, it is characterized in that: pulse laser beam is the laser beam of several nanosecond pulse length, ignore the decay of laser beam, T is the pulse width of pulse laser beam, and so the stimulated Brillouin scattering light that produces in media as well of this pulse laser beam is strong
wherein I
ssrepresent total stimulated Brillouin scattering intensity that intrafascicular two polarization states of this pulse laser produce, I
prepresent incident laser beam intensity, g
0represent stimulated Brillouin scattering gain coefficient,
represent that the stimulated Brillouin scattering light that a kind of polarization state produces is strong,
represent that the stimulated Brillouin scattering light that another polarization state produces is strong, wherein c represents the light velocity, and n represents the medium refraction index that laser beam is propagated wherein, and the pulse length of x occupied by a kind of polarization state, to I
ssdifferentiate, obtains working as
time pulse laser beam total excited Brillouin light intensity of producing obtain extreme value, according to above-mentioned differentiate result, make taps polarized laser beam through after described electro-optical medium, orthogonal two linear polarization occupy the half of pulse laser beam pulse length separately, by controller, voltage is applied to the outgoing time of laser beam and electro-optical medium and carry out accurate synchro control, also namely when half pulse before pulse laser beam is by electro-optical medium, electro-optical medium there is no voltage or there is voltage, and when rear half pulse of pulse laser beam is by electro-optical medium, electro-optical medium then have voltage or there is no voltage, also namely half pulse in front and back of pulse laser beam is completely contrary by the voltage status on electro-optical medium during electro-optical medium, the wherein said half occupying pulse length is separately the half that each polarization state continuous print occupies pulse length.
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| CN201210082476.5A CN102608828B (en) | 2012-03-22 | 2012-03-22 | Utilize the apparatus and method of electrooptical effect suppressor pulse laser beam stimulated Brillouin scattering |
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| CN201210082476.5A CN102608828B (en) | 2012-03-22 | 2012-03-22 | Utilize the apparatus and method of electrooptical effect suppressor pulse laser beam stimulated Brillouin scattering |
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| CN108572463A (en) * | 2018-03-29 | 2018-09-25 | 北京理工大学 | A kind of pulse-series generator generating polarization state continuous transformation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6850712B1 (en) * | 2000-05-31 | 2005-02-01 | Lucent Technologies Inc. | Optical fiber transmission system with polarization multiplexing to reduce stimulated brillouin scattering |
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| US8054539B2 (en) * | 2008-03-14 | 2011-11-08 | General Atomics | Optical system for reducing stimulated Brillouin scattering by controllably changing polarization direction of an optical signal |
| CN102096267B (en) * | 2010-12-13 | 2012-10-03 | 华北电力大学（保定） | Device and method for suppressing stimulated Brillouin scattering by using electro-optical effect |
| CN102087453B (en) * | 2010-12-13 | 2013-10-23 | 华北电力大学（保定） | Device and method for suppressing stimulated Brillouin scattering based on magneto-optical effect |
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| US6850712B1 (en) * | 2000-05-31 | 2005-02-01 | Lucent Technologies Inc. | Optical fiber transmission system with polarization multiplexing to reduce stimulated brillouin scattering |
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