CN101701851B - Measurement device of stimulated Brillouin frequency shift during amplification of single single-frequency pulse - Google Patents
Measurement device of stimulated Brillouin frequency shift during amplification of single single-frequency pulse Download PDFInfo
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- CN101701851B CN101701851B CN2009101544986A CN200910154498A CN101701851B CN 101701851 B CN101701851 B CN 101701851B CN 2009101544986 A CN2009101544986 A CN 2009101544986A CN 200910154498 A CN200910154498 A CN 200910154498A CN 101701851 B CN101701851 B CN 101701851B
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- multiplexer wdm
- interferometer
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Abstract
The invention relates to a measurement device of stimulated Brillouin frequency shift during the amplification of a single single-frequency pulse, comprising a single-frequency pulse signal source with the repetition frequency of 1 Hz, two 2*1 wavelength division multiplexers WDM, an F-P interferometer and a CCD display, wherein the single-frequency pulse signal source is connected with one end of one 2*1 wavelength division multiplexer WDM, and the output end of the 2*1 wavelength division multiplexer WDM 1 is connected with an optical fiber signal amplifier; the optical fiber signal amplifier is connected with one end of the other 2*1 wavelength division multiplexer WDM; the other end of one 2*1 wavelength division multiplexer WDM is welded with the other end of the other 2*1 wavelength division multiplexer WDM, and the output end of the other 2*1 wavelength division multiplexer WDM is connected with the F-P interferometer; and the output end of the F-P interferometer is connected with the CCD display. The invention can flexibly change the free spectral range and achieve high measurement precision, simple experimental equipment and low price.
Description
Technical field
The present invention relates to a kind of measurement mechanism of stimulated Brillouin frequency shift during amplification of single single-frequency pulse.
Background technology
High power single-frequency pulse signal has narrow linewidth, advantages such as beam quality with diffraction limit, thereby in industry, medical treatment, scientific research, fields such as military affairs have obtained using widely, can be used for coherent light beam and close bundle, the pumping source of optical parametric oscillation and high-precision interferometry, as gravitational wave detection, but because its live width is generally at KHZ～MHZ order of magnitude, much smaller than stimulated Brillouin scattering (SBS) gain bandwidth (GB) (generally at tens MHZ), thereby make the back become the principal element that influences single-frequency laser and the raising of amplifier output power to SBS, SBS will cause the pulse waveform distortion, but permanent damage system device when serious, thus effectively the monitoring back to the generation of SBS with to measure its frequency displacement be vital.
Through the simple signal light of theory calculating for wavelength 1 μ m, Brillouin Brillouin gain bandwidth (GB) Δ v
BBe about 38MHz, produce the peak value brillouin gain at the about 16.5GHz of Stokes shift place, Brillouin Brillouin frequency displacement 16.5GHz, promptly wavelength moves about 0.06nm.
But in experimental verification, the high precision spectro-metre is generally all expensive.So be subjected to the restriction of laboratory condition, have two difficult points with normal optical spectrometer measuring-signal light and excited Brillouin Brillouin wavelength: 1. spectrometer is easier to the measurement of continuous or quasi-continuous spectrum, and flashlight is the monopulse that repetition frequency has only 1Hz in the experiment, and spectrometer is difficult to capture signal spectrum; 2. the difference of flashlight and Brillouin Brillouin optical wavelength is 0.06nm, and the minimum resolution of normal optical spectrometer has only 0.05nm or bigger, even spectrometer adopts external trigger to capture flashlight synchronously, also be difficult to wavelength two approaching spectral discriminations like this are come out.
Summary of the invention
Excited Brillouin frequency displacement measuring equipment is caught single pulse signal difficulty, measuring accuracy is low, cost is high deficiency when amplifying in order to overcome existing single pulse signal, the invention provides a kind of measurement mechanism that can change the simple and cheap stimulated Brillouin frequency shift during amplification of single single-frequency pulse of its Free Spectral Range, measuring accuracy height, experimental facilities flexibly.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of measurement mechanism of stimulated Brillouin frequency shift during amplification of single single-frequency pulse, the pure-tone polse signal source that comprises a repetition frequency 1Hz, two 2 * 1 wavelength division multiplexer WDM, F-P interferometer and CCD display, described pure-tone polse signal source is connected with the end of one 2 * 1 wavelength division multiplexer WDM, the output terminal of described 2 * 1 wavelength division multiplexer WDM connects the fiber-optic signal amplifier, described fiber-optic signal amplifier connects the end of another 2 * 1 wavelength division multiplexer WDM, the other end welding mutually of the other end of one 2 * 1 wavelength division multiplexer WDM and another 2 * 1 wavelength division multiplexer WDM, the output terminal of described another 2 * 1 wavelength division multiplexer WDM links to each other with described F-P interferometer, and the output terminal of described F-P interferometer connects described CCD display.
" connection " of the present invention is meant the connection at light path, for example described signal amplifier connects the end of another 2 * 1 wavelength division multiplexer WDM, promptly be interpreted as " end that the light signal after amplifying from signal amplifier is input to another 2 * 1 wavelength division multiplexer WDM ", also in like manner explain in other places.
As preferred a kind of scheme: be provided with first convex lens between the output terminal of described another 2 * 1 wavelength division multiplexer WDM and the described F-P interferometer; Be provided with second convex lens between the output terminal of the described F-P of stating interferometer and the described CCD display.
Technical conceive of the present invention is: the signal source that produces stimulated Brillouin scattering (SBS) is that the single-frequency simple venation of repetition frequency 1Hz is washed off, and the signal live width is very narrow, only is 10
-4Nm, wavelength are 1053nm, pulsewidth 200ns; The gain fibre that double-cladding fiber amplifier adopts is a Yb-doped double-cladding optical fiber, inner cladding diameter 130um, numerical aperture 0.46, fibre core mode field diameter 6.5um, numerical aperture 0.12, fiber lengths 12m, the high power that guarantees flashlight amplifies, and the signal seed source is a simple signal, much smaller than the SBS gain bandwidth (GB), so the SBS threshold value is lower, excite the back easily to Brillouin scattering; 2 * 1 wavelength division multiplexer WDM1 import a termination pure-tone polse flashlight, and other end A port is realized the real-time monitoring of back to SBS as the real-time monitoring client of back to SBS; The long 0.3cm of fixation Fabry-Perot-type F-P interferometric cavity, Free Spectral Range 30GHZ, corresponding wavelength 0.1nm, both ends of the surface increase the reflectance coating of plating wavelength 1053nm99% respectively, forward signal light and back enter fixedly F-P interferometer generation interference fringe to SBS light through lens, show through the CCD imaging, according to the coordinate of two cover interference fringes, mobile computing by interference fringe goes out wavelength difference, thus the stimulated Brillouin scattering frequency displacement that produces when obtaining wavelength 1053nm single-frequency monopulse and amplifying.
Beneficial effect of the present invention mainly shows: it is low to have solved common spectro-metre resolution, be difficult to catch the problem of single pulse signal, realized the accurate measurement of SBS frequency displacement when the single-frequency monopulse amplifies, this device can be used for the line width of Laser Measurement simultaneously, differentiate zlasing mode, long by the chamber that changes fixing F-P chamber, change Free Spectral Range and resolution, have highly versatile, highly sensitive, advantage such as device is simple and cheap.
Description of drawings
Fig. 1 is the structural representation of the measurement mechanism of stimulated Brillouin frequency shift during amplification of single single-frequency pulse.
Among the figure:
The single-frequency single pulse signal source of 1-repetition frequency 1Hz; 2-2 * 1 wavelength division multiplexer WDM1; The 3-double-cladding fiber amplifier; 4-2 * 1 wavelength division multiplexer WDM2; The 5-convex lens; 6-fixation Fabry-Perot-type F-P interferometer; The 7-convex lens; 8-CCD.
Fig. 2 is the synoptic diagram of forward signal interference of light ring.
Fig. 3 is the synoptic diagram of back to Brillouin interference of light ring.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
With reference to Fig. 1, a kind of measurement mechanism of stimulated Brillouin frequency shift during amplification of single single-frequency pulse, the pure-tone polse signal source 1 that comprises a repetition frequency 1Hz, two 2 * 1 wavelength division multiplexer WDM, F-P interferometer and CCD display 8, described pure-tone polse signal source 1 is connected with the end of one 2 * 1 wavelength division multiplexer WDM2, the output terminal of described 2 * 1 wavelength division multiplexer WDM2 connects signal amplifier 3, described signal amplifier 3 connects the end of another 2 * 1 wavelength division multiplexer WDM4, the other end welding mutually of the other end of one 2 * 1 wavelength division multiplexer WDM2 and another 2 * 1 wavelength division multiplexer WDM4, the output terminal of described another 2 * 1 wavelength division multiplexer WDM4 links to each other with described F-P interferometer 6, and the output terminal of described F-P interferometer 6 connects described CCD display 8.
Be provided with first convex lens 5 between the output terminal of described another 2 * 1 wavelength division multiplexer WDM4 and the described F-P interferometer 6; Be provided with second convex lens 7 between the output terminal of described F-P interferometer 6 and the described CCD display 8.
In the present embodiment, adopt simple signal source bandwidth to have only 10 in the experiment
-4Nm, much smaller than the excited Brillouin gain bandwidth (GB), so the SBS threshold value is very low, because SBS is the energy conversion that power surpasses the pulse center of Brillouin's threshold value a stokes wave only, thereby the Stokes pulse is narrower than signal pulse, and the peak power of Stokes will be above the output power of signal pulse, too high Stokes peak power will make optical passive components such as optical fiber or optical isolator obtain permanent damage, so break signal source for fear of the back of generation to stimulated Brillouin scattering light, should monitor the back in real time to SBS light at the WDM2A port.
Adopt centre wavelength 1053nm, repetition frequency 1Hz, live width 10
-4The narrow linewidth signal source of nm, increase the pump power of double-cladding fiber amplifier 3 gradually, increase along with pump power, distortion appears in the pulse of output amplifying signal, observes the back to SBS light at the WDM2A port simultaneously, enters fixedly F-P interferometer 6 with amplifying signal light through WDM2, the fixing long 0.3cm of F-P interferometric cavity, Free Spectral Range 30GHz, corresponding wavelength 0.1nm can be observed two cover interference fringes at CCD display 8.Wavelength difference is calculated by moving interference fringes in the position of two interference rings of contrast.The coordinate that forward signal interference of light ring A is ordered among Fig. 2 is (350,280), and the B point coordinate is (173,280); The back be (242,280) to Brillouin Brillouin interference of light ring C point coordinate among Fig. 3, and the D point coordinate is (112,280), and calculating its wavelength difference is (350-242) * 0.1nm/ (350-173)=0.06102nm, moves in full accord with the SBS wavelength of Theoretical Calculation.The accurate measurement of excited Brillouin (SBS) frequency displacement when obtaining the amplification of single-frequency monopulse thus.
This device can be long by the chamber that changes fixing F-P chamber, change Free Spectral Range and resolution flexibly, its versatility is stronger, whole apparatus structure is simple, cheap, solve the low and fugacious problem of single pulse signal of common spectro-metre resolution, can be widely used in the line width of Laser Measurement, differentiated the application of many occasions such as zlasing mode.
Claims (2)
1. the measurement mechanism of a stimulated Brillouin frequency shift during amplification of single single-frequency pulse, be characterised in that: described measurement mechanism comprises the pure-tone polse signal source of a repetition frequency 1Hz, two 2 * 1 wavelength division multiplexer WDM, F-P interferometer and CCD display, described pure-tone polse signal source is connected with the end of one 2 * 1 wavelength division multiplexer WDM, the output terminal of described one 2 * 1 wavelength division multiplexer WDM connects the fiber-optic signal amplifier, described fiber-optic signal amplifier connects the end of another 2 * 1 wavelength division multiplexer WDM, the other end welding mutually of the other end of one 2 * 1 wavelength division multiplexer WDM and another 2 * 1 wavelength division multiplexer WDM, the output terminal of described another 2 * 1 wavelength division multiplexer WDM links to each other with described F-P interferometer, and the output terminal of described F-P interferometer connects described CCD display.
2. the measurement mechanism of stimulated Brillouin frequency shift during amplification of single single-frequency pulse as claimed in claim 1 is characterised in that: be provided with first convex lens between the output terminal of described another 2 * 1 wavelength division multiplexer WDM and the described F-P interferometer; Be provided with second convex lens between the output terminal of described F-P interferometer and the described CCD display.
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| CN2009101544986A CN101701851B (en) | 2009-10-30 | 2009-10-30 | Measurement device of stimulated Brillouin frequency shift during amplification of single single-frequency pulse |
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| CN101701851B true CN101701851B (en) | 2011-04-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102353452B (en) * | 2011-10-21 | 2013-04-24 | 华中科技大学 | System for measuring free spectral range of F-P (Fabry-Perot) cavity |
| CN102628736B (en) * | 2012-04-20 | 2014-10-29 | 核工业理化工程研究院 | Laser linewidth measuring device |
| CN104677393B (en) * | 2015-03-11 | 2017-05-24 | 南昌航空大学 | Method for measuring Brillouin scattering frequency shift on basis of half-angular width |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1865289A2 (en) * | 2006-06-09 | 2007-12-12 | Consiglio Nazionale delle Ricerche | Method for measuring the Brillouin shift distribution along optical fiber based on the optical demodulation of the signals, and relevant apparatus |
| US20090008536A1 (en) * | 2007-07-03 | 2009-01-08 | Schlumberger Technology Corporation | Distributed sensing in an optical fiber using brillouin scattering |
| CN101512295A (en) * | 2006-08-16 | 2009-08-19 | 普拉德研究及开发股份有限公司 | Measuring brillouin backscatter from an optical fibre using digitisation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1865289A2 (en) * | 2006-06-09 | 2007-12-12 | Consiglio Nazionale delle Ricerche | Method for measuring the Brillouin shift distribution along optical fiber based on the optical demodulation of the signals, and relevant apparatus |
| CN101512295A (en) * | 2006-08-16 | 2009-08-19 | 普拉德研究及开发股份有限公司 | Measuring brillouin backscatter from an optical fibre using digitisation |
| US20090008536A1 (en) * | 2007-07-03 | 2009-01-08 | Schlumberger Technology Corporation | Distributed sensing in an optical fiber using brillouin scattering |
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