CN102809437A - Device for measuring medium brillouin gain linetype and line width and a method for measuring medium brillouin gain linetype and line width based on device - Google Patents
Device for measuring medium brillouin gain linetype and line width and a method for measuring medium brillouin gain linetype and line width based on device Download PDFInfo
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- CN102809437A CN102809437A CN2012103164856A CN201210316485A CN102809437A CN 102809437 A CN102809437 A CN 102809437A CN 2012103164856 A CN2012103164856 A CN 2012103164856A CN 201210316485 A CN201210316485 A CN 201210316485A CN 102809437 A CN102809437 A CN 102809437A
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Abstract
The invention relates to a device for measuring a medium brillouin gain linetype and a line width and a method for measuring the medium brillouin gain linetype and the line width based on the device and aims to solve the problems existed in the measurement of the brillouin gain linetype and the line width that the measuring result credibility is low, and the own line width of a Stokes signal affects the measuring results of the brillouin gain linetype and the line width. The invention comprises the following steps: transmitting a laser pulse through a laser source, generating Stokes signal light through a Stokes light generation system, carrying out frequency spectrum measurement on Stokes light by a measuring system, controlling the passing and not passing of pump light in a light path by utilizing a chopper, further controlling the amplified incident Stokes light or the Stokes light before amplification, and measuring the medium brillouin gain linetype and the line width according to the information before and after the amplification of Stokes light frequency spectrum. The device and the method are applicable to the laser nonlinear field.
Description
Technical field
The present invention relates to the non-linear field of laser.
Background technology
Stimulated Brillouin scattering (Stimulated Brillouin Scattering is called for short SBS) is important research direction in the nonlinear optics field.Some special natures of SBS; Amplify and about the research of slower rays like the compression of phase conjugation, pulsewidth, pulse; All enjoy the favor of various countries' researcher, and at seawater salinity, temperature monitoring, aspects such as bridge, pipe stress monitoring there is wide application prospect.
In the research about SBS, Brillouin's line style of medium and live width all are very important parameters all the time.Although in optical fiber, the measurement of Brillouin's line style and live width is very ripe, yet never has a kind of method of simple possible to the measurement of Brillouin's line style of liquid, solid, gas medium and live width.Someone proposes to adopt two pool structures that shake-put; Produce the pond medium temperature through control and change Stokes flashlight centre frequency (measuring) by the F-P etalon; Meanwhile measure and amplify the pond medium, calculate at last and obtain Brillouin's line style and live width the variation relation of different frequency Stokes flashlight enlargement ratio acquisition SBS gain coefficient g with frequency.But the Stokes flashlight centre frequency measurement of this method can receive the influence of interference fringe acutance; And the measurement of gain coefficient g can receive the influence of Stokes flashlight self live width; Make measurement result that bigger error arranged; Even Stokes flashlight live width with the medium Brillouin line style of surveying when close with live width, this method gained result will be no longer credible.There is the people on the basis of said method, to propose to adopt the known blending agent volume ratio of two kinds of Brillouin shifts of control to realize changing Stokes flashlight centre frequency in addition; And calculate the Brillouin shift of blending agent through volume ratio; This method can avoid the influence of F-P etalon interference fringe acutance also to come comparatively simple relatively; But whether credible confidence level to Brillouin's line style and wire width measuring result has direct influence to the correlation computations result of the Brillouin shift of blending agent through medium mixed volume ratio, and since the influence that Stokes signal self live width is brought still can't eliminate.At present to the measurement of Brillouin's line style and live width exist measurement result than mistake, measurement result is with a low credibility and Stokes signal self live width to the influential problem of the measurement result of Brillouin's line style and live width.
Summary of the invention
The present invention for solve at present measurement to Brillouin's line style and live width exist measurement result with a low credibility with Stokes signal self live width to the influential problem of the measurement result of Brillouin's line style and live width, thereby the device that has proposed measuring media brillouin gain line style and live width reaches the method based on this measurement device medium brillouin gain line style and live width.
The device of measuring media brillouin gain line style and live width; It comprises lasing light emitter; 1/2 wave plate; Stokes light produces system; First quarter wave plate; First polaroid; Chopper; Second completely reflecting mirror; First completely reflecting mirror; The 3rd polaroid; The 3rd quarter wave plate; Amplify the pond; Second quarter wave plate; Second polaroid; The 3rd completely reflecting mirror; Measuring system and energy meter; Described Stokes light generation system comprises that condenser lens and SBS produce the pond; Measuring system comprises attenuator; F-P interferential scanning appearance; Photomultiplier; Sampling Integral device and computing machine
The lasing light emitter emission pulse laser is incident to 1/2 wave plate, is incident to first polaroid through the pulse laser of this 1/2 wave plate transmission, is divided into the S of reflection through the pulse laser of this first polaroid
11With transmitted light P
21, the S of described reflection
11Be incident to Stokes light through first quarter wave plate and produce system, the Stokes flashlight that is produced by Stokes light generation system again is back to first quarter wave plate along input path, through the transmitted light P of the first quarter wave plate transmission
11Be incident to first polaroid, through the transmitted light P of this first polaroid transmission
11In order through being incident to an end that amplifies the pond behind first completely reflecting mirror, the 3rd polaroid and the 3rd quarter wave plate, through the catoptrical S of the second quarter wave plate transmission
12After the reflection of second polaroid, be incident to measuring system again; Described transmitted light P
21In order through being incident to the other end that amplifies the pond behind chopper, second completely reflecting mirror, the 3rd completely reflecting mirror, second polaroid and second quarter wave plate, through the reflected light S of the 3rd quarter wave plate transmission
21Through being incident to energy meter after the reflection of the 3rd polaroid, the energy signal output terminal of energy meter is connected with the energy signal input end of computing machine;
SBS produces the pond and is arranged on the focal plane of condenser lens,
The Stokes flashlight output terminal of attenuator is connected with the Stokes flashlight input end of F-P interferential scanning appearance,
The Stokes optical spectrum signal output part of F-P interferential scanning appearance is connected with the Stokes optical spectrum signal input part of photomultiplier;
The Stokes electric signal output of photomultiplier is connected with the Stokes electric signal input end of Sampling Integral device;
The Stokes integrated signal output terminal of Sampling Integral device is connected with the Stokes integrated signal input end of computing machine.
Based on the measurement device medium brillouin gain line style of measuring media brillouin gain line style and live width and the method for live width,
The lasing light emitter emission pulse laser is incident to 1/2 wave plate, is incident to first polaroid through the pulse laser of this 1/2 wave plate transmission, is divided into the linearly polarized light S of S attitude through the pulse laser of this first polaroid
11Linearly polarized light P with the P attitude
21,
The linearly polarized light S of described S attitude
11Linearly polarized light S through the reflection of first polaroid
11Be incident to first quarter wave plate, through the circularly polarized light O of this first quarter wave plate transmission
11Be incident to the condenser lens of Stokes light generation system, the circularly polarized light O of line focus lens transmission
11Converge to SBS and produce pond, described circularly polarized light O
11The medium that produces the pond with SBS is had an effect, and produces the backward scattered circularly polarized light O with Brillouin shift
12, the circularly polarized light O of scattering backward
12Former road is back into and is incident upon first quarter wave plate, through the circularly polarized light O of the scattering backward of this first quarter wave plate
12Become the linearly polarized light P of the P attitude of penetrating
11, the linearly polarized light P of described P attitude
11Be incident to first polaroid; Be transmitted through first completely reflecting mirror through this first polaroid, reflex to the 3rd polaroid, be transmitted through the 3rd quarter wave plate, the linearly polarized light P of the P attitude of warp the 3rd quarter wave plate through the 3rd polaroid through this first completely reflecting mirror
11Become circularly polarized light O
13, described circularly polarized light O
13Be incident to an end that amplifies the pond as seed light;
The linearly polarized light P of described P attitude
21Be incident to chopper, the linearly polarized light P of the P attitude after this chopper modulation
21Be incident to second completely reflecting mirror, reflex to the 3rd completely reflecting mirror, reflex to second polaroid, be transmitted through second quarter wave plate, the linearly polarized light P of the P attitude of warp second quarter wave plate through second polaroid through the 3rd completely reflecting mirror through this second completely reflecting mirror
21Become circularly polarized light O
21, described circularly polarized light O
21Be incident to the other end that amplifies the pond as pump light;
Described pump light and seed light are after the interaction of amplifying the pond, and pump light has been realized shifting the seed light amplification to the energy of seed light,
Seed light after the amplification is incident to second quarter wave plate by the incident end of pump light from amplifying pond output, and the seed light after the amplification of this second quarter wave plate becomes the linearly polarized light S of S attitude
12, through second polaroid be reflected into be incident upon measuring system the Stokes flashlight through attenuator,
Attenuator is decayed the Stokes flashlight that receives, and the Stokes flashlight after will decaying is sent to F-P interferential scanning appearance,
F-P interferential scanning appearance carries out spectrum scan to the Stokes flashlight that receives, and Stokes optical spectrum signal is sent to photomultiplier,
Photomultiplier is the Stokes electric signal with the Stokes optical spectrum conversion of signals that receives, and this Stokes electric signal is sent to the Sampling Integral device;
The Sampling Integral device carries out Sampling Integral according to the Stokes electric signal that receives, and the Stokes integrated signal behind the integration is sent to computing machine;
Pump light is incident to the 3rd quarter wave plate by the seed light incident side from amplifying pond output, becomes the linearly polarized light S of S attitude through the pump light of the 3rd quarter wave plate
21, after the 3rd polaroid reflection, being incident to energy meter, this energy meter is used to monitor pump energy I, and the pump energy signal output part through energy meter is connected with the pump energy signal input part of computing machine,
Computing machine obtains Is according to the frequency spectrum data match that receives the Stokes electric signal before amplifying
0(ν), obtain Is according to the frequency spectrum data match that receives the Stokes electric signal after the amplification
a(ν); Obtain medium brillouin gain line style g (ν) by formula (1) curve fitting, obtain the live width that gains according to medium brillouin gain line style g (ν), said Is
aExpression formula (ν) does
Is
a(ν)=Is
0(ν)×exp[g(ν)IL] （1）。
Stokes luminous energy before amplifying is Is
0(ν), the Stokes luminous energy after the amplification is Is
a(ν), pump energy is I, and Brillouin amplifies the long L of being of Chi Chi, and the Stokes light frequency is ν.
The present invention directly measures the Stokes flashlight frequency spectrum after testing medium Brillouin amplifies through F-P interferential scanning appearance; Stokes signal spectrum before and after the amplification that measures is carried out the process of fitting treatment analysis; Obtain SBS medium gain spectral line g (ν) and then obtain the live width that gains; Having reached does not have the effect of influence with Stokes signal self live width to the measurement result of Brillouin's line style and live width to the measurement result of Brillouin's line style and live width is with a high credibility, has realized medium brillouin gain line style and the simple and effective purpose of wire width measuring.
Description of drawings
Fig. 1 is the apparatus structure synoptic diagram of measuring media brillouin gain line style and live width;
Fig. 2 produces the structural representation of internal system for Stokes light;
Fig. 3 is the inner structure synoptic diagram of measuring system.
Embodiment
Embodiment one; Specify this embodiment in conjunction with Fig. 1 to 3; The device of this embodiment described measuring media brillouin gain line style and live width; It comprises lasing light emitter 1; 1/2 wave plate 2; Stokes light produces system 3; First quarter wave plate 4; First polaroid 5; Chopper 6; Second completely reflecting mirror 7; First completely reflecting mirror 8; The 3rd polaroid 9; The 3rd quarter wave plate 10; Amplify pond 11; Second quarter wave plate 12; Second polaroid 13; The 3rd completely reflecting mirror 14; Measuring system 15 and energy meter 16; Described Stokes light produces system 3 and comprises that condenser lens 3-1 and SBS produce pond 3-2; Measuring system 15 comprises attenuator 15-1; F-P interferential scanning appearance 15-2; Photomultiplier 15-3; Sampling Integral device 15-4 and computing machine 15-5
Lasing light emitter 1 emission pulse laser is incident to 1/2 wave plate 2, is incident to first polaroid 5 through the pulse laser of these 1/2 wave plate, 2 transmissions, is divided into the S of reflection through the pulse laser of this first polaroid 5
11With transmitted light P
21, the S of described reflection
11Be incident to Stokes light through first quarter wave plate 4 and produce system 3, the Stokes flashlight that is produced by Stokes light generation system 3 again is back to first quarter wave plate 4 along input path, through the transmitted light P of first quarter wave plate, 4 transmissions
11Be incident to first polaroid 5, through the transmitted light P of these first polaroid, 5 transmissions
11In order through being incident to an end that amplifies pond 11 behind first completely reflecting mirror 8, the 3rd polaroid 9 and the 3rd quarter wave plate 10, through the catoptrical S of second quarter wave plate, 12 transmissions
12After 13 reflections of second polaroid, be incident to measuring system 15 again; Described transmitted light P
21In order through being incident to the other end that amplifies pond 11 behind chopper 6, second completely reflecting mirror 7, the 3rd completely reflecting mirror 14, second polaroid 13 and second quarter wave plate 12, through the reflected light S of the 3rd quarter wave plate 10 transmissions
21Through being incident to energy meter 16 after 9 reflections of the 3rd polaroid, the energy signal output terminal of energy meter 16 is connected with the energy signal input end of computing machine 15-5;
SBS produces pond 3-2 and is arranged on the focal plane of condenser lens 3-1,
The Stokes flashlight output terminal of attenuator 15-1 is connected with the Stokes flashlight input end of F-P interferential scanning appearance 15-2,
The Stokes optical spectrum signal output part of F-P interferential scanning appearance 15-2 is connected with the Stokes optical spectrum signal input part of photomultiplier 15-3;
The Stokes electric signal output of photomultiplier 15-3 is connected with the Stokes electric signal input end of Sampling Integral device 15-4;
The Stokes integrated signal output terminal of Sampling Integral device 15-4 is connected with the Stokes integrated signal input end of computing machine 15-5.
Embodiment two, combination Fig. 1 to 3 specify this embodiment; Based on embodiment one described measuring media brillouin gain line style and the measurement device medium brillouin gain line style of live width and the method for live width; Lasing light emitter 1 emission pulse laser is incident to 1/2 wave plate 2; Pulse laser through these 1/2 wave plate, 2 transmissions is incident to first polaroid 5, is divided into the linearly polarized light S of S attitude through the pulse laser of this first polaroid 5
11Linearly polarized light P with the P attitude
21,
The linearly polarized light S of described S attitude
11Linearly polarized light S through 5 reflections of first polaroid
11Be incident to first quarter wave plate 4, through the circularly polarized light O of these first quarter wave plate, 4 transmissions
11Be incident to the condenser lens 3-1 of Stokes light generation system 3, the circularly polarized light O of line focus lens 3-1 transmission
11Converge to SBS and produce pond 3-2, described circularly polarized light O
11The medium that produces pond 3-2 with SBS is had an effect, and produces the backward scattered circularly polarized light O with Brillouin shift
12, the circularly polarized light O of scattering backward
12Former road is back into and is incident upon first quarter wave plate 4, through the circularly polarized light O of the scattering backward of this first quarter wave plate 4
12Become the linearly polarized light P of the P attitude of penetrating
11, the linearly polarized light P of described P attitude
11Be incident to first polaroid 5; Be transmitted through first completely reflecting mirror 8 through this first polaroid 5, reflex to the 3rd polaroid 9, be transmitted through the 3rd quarter wave plate 10, the linearly polarized light P of the P attitude of warp the 3rd quarter wave plate 10 through the 3rd polaroid 9 through this first completely reflecting mirror 8
11Become circularly polarized light O
13, described circularly polarized light O
13Be incident to an end that amplifies pond 11 as seed light;
The linearly polarized light P of described P attitude
21Be incident to chopper 6, the linearly polarized light P of the P attitude after these chopper 6 modulation
21Be incident to second completely reflecting mirror 7, reflex to the 3rd completely reflecting mirror 14, reflex to second polaroid 13, be transmitted through second quarter wave plate 12, the linearly polarized light P of the P attitude of warp second quarter wave plate 12 through second polaroid 13 through the 3rd completely reflecting mirror 14 through this second completely reflecting mirror 7
21Become circularly polarized light O
21, described circularly polarized light O
21Be incident to the other end that amplifies pond 11 as pump light; Chopper 6 is controlled passing through and not passing through of pump light in light path, and then control is incident to the Stokes light before Stokes light after the amplification or the amplification that is of F-P interferential scanning appearance 15-2;
Described pump light and seed light are after the interaction of amplifying pond 11, and pump light has been realized shifting the seed light amplification to the energy of seed light,
Seed light after the amplification is incident to second quarter wave plate 12 by the incident end of pump light from amplifying pond 11 outputs, and the seed light after the amplification of this second quarter wave plate 12 becomes the linearly polarized light S of S attitude
12, through second polaroid 13 be reflected into be incident upon measuring system 15 the Stokes flashlight through attenuator 15-1,
Attenuator 15-1 decays the Stokes flashlight that receives, and the Stokes flashlight after will decaying is sent to F-P interferential scanning appearance 15-2,
F-P interferential scanning appearance 15-2 carries out spectrum scan to the Stokes flashlight that receives, and Stokes optical spectrum signal is sent to photomultiplier 15-3,
Photomultiplier 15-3 is the Stokes electric signal with the Stokes optical spectrum conversion of signals that receives, and this Stokes electric signal is sent to Sampling Integral device 15-4;
Sampling Integral device 15-4 carries out Sampling Integral according to the Stokes electric signal that receives, and the Stokes integrated signal behind the integration is sent to computing machine 15-5;
Pump light is incident to the 3rd quarter wave plate 10 by the seed light incident side from amplifying pond 11 outputs, becomes the linearly polarized light S of S attitude through the pump light of the 3rd quarter wave plate 10
21, after the reflection of the 3rd polaroid 9, being incident to energy meter 16, this energy meter 16 is used to monitor pump energy I, and the pump energy signal output part through energy meter 16 is connected with the pump energy signal input part of computing machine 15-5,
Computing machine 15-5 obtains Is according to the frequency spectrum data match that receives the Stokes electric signal before amplifying
0(ν), obtain Is according to the frequency spectrum data match that receives the Stokes electric signal after the amplification
a(ν); Obtain medium brillouin gain line style g (ν) by formula (1) curve fitting, obtain the live width that gains according to medium brillouin gain line style g (ν), said Is
aExpression formula (ν) does
Is
a(ν)=Is
0(ν)×exp[g(ν)IL] （1）。
Stokes luminous energy before amplifying is Is
0(ν), the Stokes luminous energy after the amplification is Is
a(ν), pump energy is I, and Brillouin amplifies the long L of being of Chi Chi, and the Stokes light frequency is ν.
This embodiment has the following advantages:
1, adopts F-P interferential scanning appearance, photomultiplier, Sampling Integral device directly the Stokes flashlight to be carried out spectrum measurement, can eliminate the error of bringing because of the interference fringe acutance when measuring with the F-P etalon;
2, this measuring method self is exactly to utilize the information of Stokes flashlight frequency spectrum before and after amplifying to come the Brillouin's line style and the live width of measuring media, therefore need not consider the adverse effect that it self live width is brought;
3, pump light is rationally modulated, the envelope that comprises Stokes flashlight amplification front and back spectrum information can come out under a coordinate system in match, can reduce the influence that the shake of Stokes signal frequency brings.
4, this method can extend to and measure the changing value that the SBS medium is used for the gain live width under the non-colinear structure for amplifying and the centre frequency that gains.
Claims (2)
1. the device of measuring media brillouin gain line style and live width; It is characterized in that: it comprises lasing light emitter (1); 1/2 wave plate (2); Stokes light produces system (3); First quarter wave plate (4); First polaroid (5); Chopper (6); Second completely reflecting mirror (7); First completely reflecting mirror (8); The 3rd polaroid (9); The 3rd quarter wave plate (10); Amplify pond (11); Second quarter wave plate (12); Second polaroid (13); The 3rd completely reflecting mirror (14); Measuring system (15) and energy meter (16); Described Stokes light produces system (3) and comprises that condenser lens (3-1) and SBS produce pond (3-2); Measuring system (15) comprises attenuator (15-1); F-P interferential scanning appearance (15-2); Photomultiplier (15-3); Sampling Integral device (15-4) and computing machine (15-5)
Lasing light emitter (1) emission pulse laser is incident to 1/2 wave plate (2), is incident to first polaroid (5) through the pulse laser of this 1/2 wave plate (2) transmission, is divided into the S of reflection through the pulse laser of this first polaroid (5)
11With transmitted light P
21, the S of described reflection
11Be incident to Stokes light through first quarter wave plate (4) and produce system (3), the Stokes flashlight that is produced by Stokes light generation system (3) again is back to first quarter wave plate (4) along input path, through the transmitted light P of first quarter wave plate (4) transmission
11Be incident to first polaroid (5), through the transmitted light P of this first polaroid (5) transmission
11In order through being incident to an end that amplifies pond (11) behind first completely reflecting mirror (8), the 3rd polaroid (9) and the 3rd quarter wave plate (10), through the catoptrical S of second quarter wave plate (12) transmission
12After second polaroid (13) reflection, be incident to measuring system (15) again; Described transmitted light P
21Be incident to the other end that amplifies pond (11) after passing through chopper (6), second completely reflecting mirror (7), the 3rd completely reflecting mirror (14), second polaroid (13) and second quarter wave plate (12) in order, through the reflected light S of the 3rd quarter wave plate (10) transmission
21Through being incident to energy meter (16) after the 3rd polaroid (9) reflection, the energy signal output terminal of energy meter (16) is connected with the energy signal input end of computing machine (15-5);
SBS produces pond (3-2) and is arranged on the focal plane of condenser lens (3-1),
The Stokes flashlight output terminal of attenuator (15-1) is connected with the Stokes flashlight input end of F-P interferential scanning appearance (15-2),
The Stokes optical spectrum signal output part of F-P interferential scanning appearance (15-2) is connected with the Stokes optical spectrum signal input part of photomultiplier (15-3);
The Stokes electric signal output of photomultiplier (15-3) is connected with the Stokes electric signal input end of Sampling Integral device (15-4);
The Stokes integrated signal output terminal of Sampling Integral device (15-4) is connected with the Stokes integrated signal input end of computing machine (15-5).
2. based on the measurement device medium brillouin gain line style of claim 1 described measuring media brillouin gain line style and live width and the method for live width; It is characterized in that: lasing light emitter (1) emission pulse laser is incident to 1/2 wave plate (2); Pulse laser through this 1/2 wave plate (2) transmission is incident to first polaroid (5), is divided into the linearly polarized light S of S attitude through the pulse laser of this first polaroid (5)
11Linearly polarized light P with the P attitude
21,
The linearly polarized light S of described S attitude
11Linearly polarized light S through first polaroid (5) reflection
11Be incident to first quarter wave plate (4), through the circularly polarized light O of this first quarter wave plate (4) transmission
11Be incident to the condenser lens (3-1) of Stokes light generation system (3), the circularly polarized light O of line focus lens (3-1) transmission
11Converge to SBS and produce pond (3-2), described circularly polarized light O
11The medium that produces pond (3-2) with SBS is had an effect, and produces the backward scattered circularly polarized light O with Brillouin shift
12, the circularly polarized light O of scattering backward
12Former road is back into and is incident upon first quarter wave plate (4), through the circularly polarized light O of the scattering backward of this first quarter wave plate (4)
12Become the linearly polarized light P of the P attitude of penetrating
11, the linearly polarized light P of described P attitude
11Be incident to first polaroid (5); Be transmitted through first completely reflecting mirror (8) through this first polaroid (5); Reflex to the 3rd polaroid (9) through this first completely reflecting mirror (8); Be transmitted through the 3rd quarter wave plate (10) through the 3rd polaroid (9), the linearly polarized light P of the P attitude of warp the 3rd quarter wave plate (10)
11Become circularly polarized light O
13, described circularly polarized light O
13Be incident to an end that amplifies pond (11) as seed light;
The linearly polarized light P of described P attitude
21Be incident to chopper (6), the linearly polarized light P of the P attitude after this chopper (6) modulation
21Be incident to second completely reflecting mirror (7); Reflex to the 3rd completely reflecting mirror (14) through this second completely reflecting mirror (7); Reflex to second polaroid (13) through the 3rd completely reflecting mirror (14); Be transmitted through second quarter wave plate (12) through second polaroid (13), the linearly polarized light P of the P attitude of warp second quarter wave plate (12)
21Become circularly polarized light O
21, described circularly polarized light O
21Be incident to the other end that amplifies pond (11) as pump light;
Described pump light and seed light are after the interaction of amplifying pond (11), and pump light has been realized shifting the seed light amplification to the energy of seed light,
Seed light after the amplification is incident to second quarter wave plate (12) by the incident end of pump light from amplifying pond (11) output, and the seed light after the amplification of this second quarter wave plate (12) becomes the linearly polarized light S of S attitude
12, through second polaroid (13) be reflected into be incident upon measuring system (15) the Stokes flashlight through attenuator (15-1),
Attenuator (15-1) is decayed the Stokes flashlight that receives, and the Stokes flashlight after will decaying is sent to F-P interferential scanning appearance (15-2),
F-P interferential scanning appearance (15-2) carries out spectrum scan to the Stokes flashlight that receives, and Stokes optical spectrum signal is sent to photomultiplier (15-3),
Photomultiplier (15-3) is the Stokes electric signal with the Stokes optical spectrum conversion of signals that receives, and this Stokes electric signal is sent to Sampling Integral device (15-4);
Sampling Integral device (15-4) carries out Sampling Integral according to the Stokes electric signal that receives, and the Stokes integrated signal behind the integration is sent to computing machine (15-5);
Pump light is incident to the 3rd quarter wave plate (10) by the seed light incident side from amplifying pond (11) output, becomes the linearly polarized light S of S attitude through the pump light of the 3rd quarter wave plate (10)
21, after the 3rd polaroid (9) reflection, being incident to energy meter (16), this energy meter (16) is used to monitor pump energy I, and the pump energy signal output part through energy meter (16) is connected with the pump energy signal input part of computing machine (15-5),
Computing machine (15-5) obtains Is according to the frequency spectrum data match that receives the Stokes electric signal before amplifying
0(ν), obtain Is according to the frequency spectrum data match that receives the Stokes electric signal after the amplification
a(ν); Obtain medium brillouin gain line style g (ν) by formula (1) curve fitting, obtain the live width that gains according to medium brillouin gain line style g (ν), said Is
aExpression formula (ν) does
Is
a(ν)=Is
0(ν)×exp[g(ν)IL] （1）
Stokes luminous energy before amplifying is Is
0(ν), the Stokes luminous energy after the amplification is Is
a(ν), pump energy is I, and Brillouin amplifies the long L of being of Chi Chi, and the Stokes light frequency is ν.
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| CN201210316485.6A CN102809437B (en) | 2012-08-31 | 2012-08-31 | Device for measuring medium brillouin gain linetype and line width and a method for measuring medium brillouin gain linetype and line width based on device |
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| CN104568846A (en) * | 2015-01-15 | 2015-04-29 | 南昌航空大学 | Two-dimensional scan detection method for sea water halocline based on brillouin scattering |
| CN111525381A (en) * | 2020-04-28 | 2020-08-11 | 河北工业大学 | Single-frequency Brillouin beam combination laser |
| CN112285094A (en) * | 2020-12-30 | 2021-01-29 | 武汉光谷航天三江激光产业技术研究院有限公司 | CARS spectrum detection system and method based on line width adjustment |
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| CN104568846B (en) * | 2015-01-15 | 2017-02-22 | 南昌航空大学 | Two-dimensional scan detection method for sea water halocline based on brillouin scattering |
| CN111525381A (en) * | 2020-04-28 | 2020-08-11 | 河北工业大学 | Single-frequency Brillouin beam combination laser |
| CN112285094A (en) * | 2020-12-30 | 2021-01-29 | 武汉光谷航天三江激光产业技术研究院有限公司 | CARS spectrum detection system and method based on line width adjustment |
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