CN102252975B - Forward degenerate four-wave mixing based isotope detection method with ultrahigh sensitivity - Google Patents
Forward degenerate four-wave mixing based isotope detection method with ultrahigh sensitivity Download PDFInfo
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Abstract
The invention discloses an FDFWM (forward degenerate four-wave mixing) based isotope detection method with an ultrahigh sensitivity. The method comprises the following steps: a laser beam is divided into three light beams with a same light path; space positions of the three light beams are adjusted; the three light beams are focused and interacted with an isotope sample to be detected on a focusing point to generate an FDFWM signal; a center frequency of a laser is scanned, and a photoelectric detector is employed to measure the FDFWM signal of the isotope sample to be detected, so as to obtain an FDFWM signal spectrum, which changes with the laser center frequency, of the FDFWM signal; and content information of the isotope sample to be detected is obtained according to the FDFWM signal spectrum. The method of the invention can increase a sensitivity of an isotope detection and realize near nondestructive test; if the method of the invention is employed to detect an isotope, a detection limit is lowered, and a sampling amount is reduced; besides, the method has advantages of relative simple equipment, convenient operation, and ultrahigh sensitivity and detection precision.
Description
Technical field
The invention belongs to nonlinear optical spectral technology category, relate to a kind of isotope detection method, be specifically related to a kind of hypersensitivity isotope detection method based on forward direction degeneration four-wave mixing (Forward degenerate four-wave mixing, FDFWM).
Background technology
Isotope analysis has important application in fields such as geology, archaeology, nuclear technology, biomedical spike, environmental sciences.Isotope analysis is a kind of main rock and geology event dating means, by means of U-Pb, and K-Ar, Rb-Sr and some other isotope for age determination, provide from the data of geologize event on sequential or process.Equally, isotope is surveyed a year technology and also have obvious meaning in archaeology, as: C-14 surveys a year method, and Pb isotopic ratio method is surveyed historical relic age and place of production method etc.In nuclear industry, people pass through U, Pu, Li, T, B, the evaluation of the products such as D and the analysis of production process, the burnup situation in the monitoring nuclear fuel cycle.The biomedical grade in research, people are with D,
13C，
14C，
18O etc. replace the H in organic molecule,
12C，
16O, to the mark in addition such as food, medicine, poisonous substance, metabolin, bacterium, just likely under physiological conditions transfer and the transfer velocity, metabolism of these materials of follow in body change; Find out the predecessor of reaction product or existing metabolin, thereby determine metabolic pathway; Can study the speed of transformation, the condition mechanism of generation etc. (LiuBing Huan etc. write, mass-spectrometry method and isotope analysis, Science Press, 1983, p147).
The degree of being familiar with the world along with development and the people of science and technology deepens continuously, and the isotope analysis technology more and more requires to have " standard ", " essence ", " lacking ", " rare ", characteristics such as " soon ".Up to now, mass-spectrometric technique is the Main Means of isotope analysis.Yet there are a lot of defects in mass-spectrometric technique, and is as high in cost, sample pre-treatments is complicated, detect length consuming time etc.The consumption sample amount of mass-spectrometric technique large (Gamma Magnitude), this drawback make it can not meet without the requirement that undermines nearly Non-Destructive Testing far away, as rare cultural relics etc.The another one critical defect of mass-spectrometric technique is that isobar disturbs, this makes a lot of isotopes can not be resolved (Dominic Lariviere, Vivien F. Taylor, R. Douglas Evans, R. Jack Cornett. Spectrochimica. Acta Part B 2006,61 877.).
Summary of the invention
For the defect that exists in prior art or deficiency, the object of the invention is to, a kind of isotope of hypersensitivity based on FDFWM spectral method of detection is provided, the method has been applied a kind of brand-new thinking and has been analyzed isotope, with nonlinear spectroscopy commercial measurement isotope, can improve isotope detection sensitivity, realize nearly Non-Destructive Testing, detect isotope with method of the present invention, can reduce detection limit, reduce sampling amount, and use equipment is relatively simple, and convenient operation has hypersensitivity and accuracy of detection.
In order to achieve the above object, the present invention adopts following technical solution:
A kind of isotope detection method based on forward direction degeneration four-wave mixing spectral technique, is characterized in that, specifically according to following steps, carries out:
(1) beam of laser is divided into three-beam;
(2) adjust the relative space position of three-beam, make three-beam meet the following conditions:
Equivalent optical path;
The direction of propagation is identical;
Travel path is parallel to each other;
On the arbitrary section of the travel path of three-beam, the hot spot of three-beam forms a waist and fails to grow up in the isosceles right triangle of 1 centimetre;
(3) three-beam that step (2) is obtained focuses on, and this three-beam interacts and produces the FDFWM signal with the isotope sample to be measured that is positioned at focus point;
(4) centre frequency of scanned laser, the FDFWM signal with photodetector measurement isotope sample to be measured, obtain the FDFWM signal spectrum that the FDFWM signal changes with the laser instrument centre frequency;
(5) judge the kind of isotope sample to be measured according to the peak position of the FDFWM signal spectrum that obtains, then according to the kind of isotope sample to be measured, the peak height of FDFWM signal spectrum, obtain the content information of isotope sample to be measured.
The present invention also comprises following other technologies feature:
There is the energy level resonant frequency of isotope sample to be measured in described laser.
Described laser linewidth is less than the spectrum interval of isotope sample to be measured.
The laser instrument of exporting described laser can continuous tuning near the energy level resonant frequency of isotope sample to be measured.
Compare with existing mass-spectrometric technique, method of the present invention has the following advantages:
(1) simplified equipment, reduced operation easier, saved cost.
(2) empirical tests, detection limit reach the Acker magnitude.Greatly reduce detection limit, reduced sampling amount;
(3) because the FDFWM signal is coherent light, accuracy of detection is improved greatly, avoided with heavily disturbing.
(4) adopt 1/2nd wave plates to add the polarization beam splitting cube and make up light splitting, control the intensity of three beams incident laser by rotating 1/2nd wave plate angles, obtain maximum signal intensity, in addition, this light splitting skill can also be controlled the polarization state of FDFWM, effectively avoids background interference, improves signal to noise ratio (S/N ratio).
Description of drawings
Fig. 1 is light path schematic diagram of the present invention.Number in the figure implication: 1-laser instrument; 21-the first total reflective mirror; 22-the second total reflective mirror; 23-the 3rd total reflective mirror; 24-the 4th total reflective mirror; 25-the 5th total reflective mirror; 26-the 6th total reflective mirror; 31-the first polarization beam splitting cube; 32-the second polarization beam splitting cube; 33-the 3rd polarization beam splitting cube; 34-the 4th polarization beam splitting cube; 41-the 1/1st wave plate; 42-the 1/2nd wave plate; 43-the 1/3rd wave plate; 51-the first convex lens; 52-the second convex lens; The 6-sample cell; The 7-spatial light filter; The 8-photodetector.
Fig. 2 is the FDFWM spectrum of rubidium sample.
Below in conjunction with the drawings and specific embodiments, the present invention is further explained explanation.
Embodiment
Embodiment 1:
Prepare following test component:
Laser instrument, select applicable laser instrument according to isotope to be measured, the laser center frequency of this laser instrument emission is identical with the energy level resonant frequency of isotope sample to be measured, laser linewidth is less than the spectrum interval of isotope sample to be measured, and laser instrument can continuous tuning near the energy level resonant frequency of isotope sample to be measured.Specifically select narrow bandwidth ring dye laser or the semiconductor laser of continuously-tuning.
6 of identical total reflective mirrors, plate 45 ° of high-reflecting films (〉 99% of this laser frequency scope according to the frequency of laser instrument Emission Lasers to total reflective mirror).
4, identical polarization beam splitting cube, the polarization beam splitting cube of the applicable laser frequency scope of selection.
3 of 1/2nd identical wave plates, 1/2nd wave plates of the applicable laser frequency scope of selection.
2, identical convex lens, plate the high transmittance film (〉 99% of laser frequency scope according to the frequency of laser instrument Emission Lasers to convex lens), focal length is greater than 1 meter.
Sample cell, adopt the rubidium sample cell in the present embodiment, be wound around heating tape outside sample cell.
Spatial light filter.
Photodetector, be chosen in the high photodetector that responds of laser wavelength range.
As shown in Figure 1, the isotope detection method based on forward direction degeneration four-wave mixing spectral technique of the present invention, specifically according to following steps, carry out:
Set a coordinate-system xyz, wherein, the xy face is defined as the face at horizontal table top place.
(1) laser instrument 1 is placed in A point on horizontal table top, opens laser instrument 1 Output of laser, this laser is the horizontal linear polarization light that polarization direction is parallel to surface level, along x axle negative sense, propagates.B on the path of this laser, 2 of C set gradually the 1/1st wave plate 41, the first polarization spectro cube 31, and described laser is normal incidence the 1/1st wave plate 41 and the first polarizing cube 31 successively.The optical axis direction of the 1/1st wave plate 41 is parallel to the y axle, and the angle of the cemented surface of the first polarizing cube 31 and xy face is 90 °, and the angle of this cemented surface and xz face is 45 °.Rotate the 1/1st wave plate 41 and make its optical axis turn clockwise 35 °, thereby described horizontal linear polarization polarisation of light direction is turned clockwise 70 ° and becomes P0 light along the vertical plane at its place.After the first polarization spectro cube 31, become P1 light after the horizontal linear polarization component transmission of P0 light, become S1 light after the vertical curve polarized component reflection of P0 light.
E on the path of S1 light, 2 of F place the 1/2nd wave plate 42, the second polarization spectro cube 32 successively, make laser normal incidence the 1/2nd wave plate 42 and the second polarizing cube 32 successively.The optical axis direction of the 1/2nd wave plate 42 is parallel to the z axle, and the angle of the cemented surface of the second polarizing cube 32 and xy face is 90 °, and the angle of this cemented surface and xz face is 45 °.Rotate the 1/2nd wave plate 42 and make its optical axis turn over clockwise 22.5 °, make S1 polarisation of light direction turn over clockwise 45 ° and become S2 light; After the second polarization spectro cube 32, become P2 light after the horizontal linear polarization component transmission of S2 light, become S4 light after the vertical curve polarized component reflection of S2 light.
So far, the beam of laser of laser instrument 1 output has been divided into three-beam: P1 light, S4 light and P2 light.
(2) coated surface of the point of the D on P1 light path placement the first total reflective mirror 21, the first total reflective mirrors 21 and the angle of xy face are 90 °, and the coated surface normal plane is negative 45 ° with respect to the xz face, and P1 light is propagated along the negative sense of y axle after the first total reflective mirror 21 reflections.
G point on the P2 light path arranges the 1/3rd wave plate 43, makes P2 light positive incident the 1/3rd wave plate 43; The optical axis direction of the 1/3rd wave plate 43 is parallel to the x direction; Rotate the 1/3rd wave plate 43 and make its optical axis turn over clockwise 45 °, thereby make P2 light become the S3 light of vertical curve polarization; H point on the S3 light path is placed the coated surface of the 3rd total reflective mirror 23, the three total reflective mirrors 23 and the angle of xy face is 90 °, and this coated surface normal plane is 135 ° with respect to the xz face; S3 light is propagated along x axle negative sense after the 3rd total reflective mirror reflection;
J point on the S4 light path arranges the coated surface of the second total reflective mirror 22, the second total reflective mirrors 22 and the angle of xy face is 90 °, and this coated surface normal plane is negative 45 ° with respect to the xz face, and line segment FJ is less than the length of line segment CD; S4 light is propagated along y axle negative sense after the second total reflective mirror 22 reflections; I point on the S4 light path arranges the 4th total reflective mirror 24, large 1 centimetre of the length of the Length Ratio line segment FH of line segment JI, and the angle of the coated surface of the 4th total reflective mirror 24 and xy face is 90 °, this coated surface normal plane is 135 ° with respect to the xz face; Attention when placing the 4th total reflective mirror 24, makes the 4th total reflective mirror 24 can reflect S4 light and not stop S3 light, and finely tunes the 4th total reflective mirror 24, and making S4 light is 1 centimetre at the hot spot of the 4th total reflective mirror 24 and the distance of S3 light; S4 light is propagated along x axle negative sense after the 4th total reflective mirror 24 reflections, and the distance of S4 light and xy face equals the distance of S3 light to the xy face.
K point on the travel path of P1 light arranges the 3rd polarization spectro cube 33, makes line segment DK equal line segment CH, thereby makes S3 light, S4 light incident the 3rd polarizing cube 33; The angle of the cemented surface of the 3rd polarizing cube 33 and xy face is 90 °, and the angle of this cemented surface and xz face is 45 °; P1 light transmission the 3rd polarization spectro cube 33, S4 light and S3 light are respectively through the 3rd polarization spectro cube reflection;
Take P1 light as reference light, the screw of the prism platform below of fine setting placement the 3rd polarization spectro cube 33 is regulated the luffing angle of the 3rd polarization spectro cube 33, make P1 light and S3 light meet after the 3rd polarizing cube 33: on the arbitrary section on travel path both, the line of the hot spot of the hot spot of S3 light and P1 light is parallel to the z axle, and the hot spot of S3 light is in hot spot 1 centimeters directly over z is axial of P1 light.
So far, the relative space position of three beams incident light is determined, P1 light, S3 light, S4 light are parallel to each other and co-propagate, and on the arbitrary section in three path, waist length of hot spot formation of three is the isosceles right triangle of 1 centimetre, and wherein the hot spot of S3 light is the summit, right angle of this isosceles right-angle triangle.
(3) the L point arranges the 5th total reflective mirror 25 on the path of P1 light, make simultaneously S3 light, the S4 light also can incident the 5th total reflective mirror 25, the length of line segment DL is greater than line segment DK, and the coated surface of the 5th total reflective mirror 25 and xy face angle are 90 °, and the normal plane of this coated surface is 45 ° with respect to the xz face; P1 light, S3 light and S4 light after the 5th total reflective mirror 25 reflection all along the forward-propagating of x axle;
Place successively convex lens 51 and convex lens 52 on the path of P1 light, make these convex lens 51 and convex lens 52 form telescopic system, make simultaneously P1 light, S3 light and S4 light positive incident convex lens 51.Place sample cell 6 between two convex lens, make the back focus of the first convex lens 51 in sample cell 6 central authorities.
P1 light, S3 light and S4 light focus on sample cell 6 central authorities a bit after the first convex lens 51, isotope sample common and to be measured interacts and produces the FDFWM signal; P1 light, S3 light, S4 light and FDFWM signal are parallel to each other and advance after the second convex lens 52.
Filter P1 light, S3 light, S4 light with spatial light filter 7, a residual F DFWM signal; Placing successively the give out light cemented surface of cube 34 and the angle of xy face of the 4th polarization spectro cube 34, the 6th total reflective mirror 26, the four polarizations after spatial light filter 7 is 90 °, and the angle of this cemented surface and xz face is 45 °; The angle of the coated surface of the 6th total reflective mirror 26 and xy face is 90 °, and the normal plane of this coated surface is negative 135 ° with respect to the xz face; The FDFWM signal, by the 6th total reflective mirror 26 reflections, then, is placed photodetector 8 by the 4th polarization spectro cube 34 on the path of the FDFWM signal after the 6th total reflective mirror 26 reflections, make the light-sensitive surface of FDFWM signal normal incident light electric explorer 8.
(4) centre frequency of scanned laser, and measure the FDFWM signal of isotope samples to be measured with photodetector 8, obtain the FDFWM signal spectrum that changes with the laser instrument centre frequency.
The kind of the peak position judgement isotope sample to be measured of the FDFWM signal spectrum that (5) obtains according to step (4), then according to the kind of isotope sample to be measured, the peak height of FDFWM signal spectrum, obtain the content information of isotope sample to be measured.
As shown in Figure 2, after using this method to test rubidium (Rb) atomic sample, obtain the FDFWM spectrum of the D2 line of rubidium atom, in step (4), in the centre frequency of the wavelength coverage internal scanned laser of 780.220nm-780.550 nm.In figure, c, b are the FWDWM spectrum of Rb-85, and a, d are the FDFWM spectrum of Rb-87; Fig. 2 obtains when Rb sample cell temperature is 18 ℃, at this moment, the Rb-85 atom that participates in the FDFWM process is 0.57 Acker (10
-18Gram), the Rb-87 of participation FDFWM process is 0.22 Acker; And the detection limit of mass-spectrometric technique is generally microgram (10
-6Gram) level; This shows, method of the present invention has ultralow detection limit, hypersensitivity.
Embodiment 1 is the more excellent embodiment of the present invention, but the present invention is not limited only to this embodiment, and any method according to method detection isotopic content of the present invention all within the scope of the invention.
Followingly according to theoretical procedure, be described further:
Laser instrument 1 is exported horizontal linear polarization light, establishes its electric field intensity size and is
E 0, the 1/1st wave plate 41 can change the polarization direction of horizontal line polarisation, and the horizontal component of electric field intensity and the size of vertical component are respectively
, wherein,
θBe the angle that 1/2nd relative its major axes orientations of wave plate 3 turn over, horizontal component is through the first polarization beam splitting cube 31 transmissions, and vertical component is through the first polarization beam splitting cube 31 reflections.Horizontal component is
In like manner, the combination of the 1/2nd wave plate 42 and the second polarization beam splitting cube 32 is divided into the two orthogonal light of bundle with vertical component: wherein, horizontal component is
, vertical component is
Two convex lens form a telescopic system, between two convex lens, and the three beams incident light
With
Three body diagonals along a space regular prism are propagated, and through first convex lens 51, focus on sample cell 6 central authorities a bit,
With
When common and test substance interacts, meeting phase-matching condition, namely the wave vector of four ripples meets
The time, producing the FDFWM signal, the FDFWM signal is propagated along the 4th body diagonal of space regular prism;
And the FDFWM signal is parallel to each other after second convex lens 5;
The DFWM signal that produces
Light intensity be:
It is transition dipole moment
μ eg, the function of off resonance amount △ and relaxation coefficient Γ.
Be proportional to population density, thus the FDFWM signal intensity be proportional to population density square.
Claims (1)
1. isotope detection method based on forward direction degeneration four-wave mixing spectral technique, specifically according to following steps, carry out:
Set a coordinate-system xyz, wherein, the xy face is defined as the face at horizontal table top place;
(1) laser instrument (1) is placed in A point on horizontal table top, opens laser instrument (1) Output of laser, this laser is the horizontal linear polarization light that polarization direction is parallel to surface level, along x axle negative sense, propagates; B on the path of this laser, 2 of C set gradually the 1/1st wave plate (41), the first polarization spectro cube (31), and described laser is normal incidence the 1/1st wave plate (41) and the first polarization spectro cube (31) successively; The optical axis direction of the 1/1st wave plate (41) is parallel to the y axle, and the cemented surface of the first polarization spectro cube (31) and the angle of xy face are 90 °, and the angle of this cemented surface and xz face is 45 °; Rotate the 1/1st wave plate (41) and make its optical axis turn clockwise 35 °, thereby described horizontal linear polarization polarisation of light direction is turned clockwise 70 ° and becomes P0 light along the vertical plane at its place; After the first polarization spectro cube (31), become P1 light after the horizontal linear polarization component transmission of P0 light, become S1 light after the vertical curve polarized component reflection of P0 light;
E on the path of S1 light, 2 of F place the 1/2nd wave plate (42), the second polarization spectro cube (32) successively, make laser normal incidence the 1/2nd wave plate (42) and the second polarization spectro cube (32) successively; The optical axis direction of the 1/2nd wave plate (42) is parallel to the z axle, and the cemented surface of the second polarization spectro cube (32) and the angle of xy face are 90 °, and the angle of this cemented surface and xz face is 45 °; Rotate the 1/2nd wave plate (42) and make its optical axis turn over clockwise 22.5 °, make S1 polarisation of light direction turn over clockwise 45 ° and become S2 light; After the second polarization spectro cube (32), become P2 light after the horizontal linear polarization component transmission of S2 light, become S4 light after the vertical curve polarized component reflection of S2 light;
So far, the beam of laser of laser instrument (1) output has been divided into three-beam: P1 light, S4 light and P2 light;
(2) point of the D on the P1 light path is placed the first total reflective mirror (21), the coated surface of the first total reflective mirror (21) and the angle of xy face are 90 °, the coated surface normal plane is negative 45 ° with respect to the xz face, and P1 light negative sense along the y axle after the first total reflective mirror (21) reflection is propagated;
G point on the P2 light path arranges the 1/3rd wave plate (43), makes P2 light positive incident the 1/3rd wave plate (43); The optical axis direction of the 1/3rd wave plate (43) is parallel to the x direction; Rotate the 1/3rd wave plate (43) and make its optical axis turn over clockwise 45 °, thereby make P2 light become the S3 light of vertical curve polarization; H point on the S3 light path is placed the 3rd total reflective mirror (23), and the coated surface of the 3rd total reflective mirror (23) and the angle of xy face are 90 °, and this coated surface normal plane is 135 ° with respect to the xz face; S3 light is propagated along x axle negative sense after the 3rd total reflective mirror reflection;
J point on the S4 light path arranges the second total reflective mirror (22), and the coated surface of the second total reflective mirror (22) and the angle of xy face are 90 °, and this coated surface normal plane is negative 45 ° with respect to the xz face, and line segment FJ is less than the length of line segment CD; S4 light is propagated along y axle negative sense after the second total reflective mirror (22) reflection; I point on the S4 light path arranges the 4th total reflective mirror (24), large 1 centimetre of the length of the Length Ratio line segment FH of line segment JI, and the coated surface of the 4th total reflective mirror (24) and the angle of xy face are 90 °, this coated surface normal plane is 135 ° with respect to the xz face; Attention when placing the 4th total reflective mirror (24), makes the 4th total reflective mirror (24) can reflect S4 light and not stop S3 light, and finely tunes the 4th total reflective mirror (24), and making S4 light is 1 centimetre at the hot spot of the 4th total reflective mirror (24) and the distance of S3 light; S4 light is propagated along x axle negative sense after the 4th total reflective mirror (24) reflection, and the distance of S4 light and xy face equals the distance of S3 light to the xy face;
K point on the travel path of P1 light arranges the 3rd polarization spectro cube (33), makes line segment DK equal line segment CH, thereby makes S3 light, S4 light incident the 3rd polarization spectro cube (33); The cemented surface of the 3rd polarization spectro cube (33) and the angle of xy face are 90 °, and the angle of this cemented surface and xz face is 45 °; P1 light transmission the 3rd polarization spectro cube (33), S4 light and S3 light are respectively through the 3rd polarization spectro cube reflection;
Take P1 light as reference light, the screw of the prism platform below of fine setting placement the 3rd polarization spectro cube (33) is regulated the luffing angle of the 3rd polarization spectro cube (33), make P1 light and S3 light meet after the 3rd polarization spectro cube (33): on the arbitrary section on travel path both, the line of the hot spot of the hot spot of S3 light and P1 light is parallel to the z axle, and the hot spot of S3 light is in hot spot 1 centimeters directly over z is axial of P1 light;
So far, the relative space position of three beams incident light is determined, P1 light, S3 light, S4 light are parallel to each other and co-propagate, and on the arbitrary section in three path, waist length of hot spot formation of three is the isosceles right triangle of 1 centimetre, and wherein the hot spot of S3 light is the summit, right angle of this isosceles right-angle triangle;
(3) the L point arranges the 5th total reflective mirror (25) on the path of P1 light, make simultaneously S3 light, the S4 light also can incident the 5th total reflective mirror (25), the length of line segment DL is greater than line segment DK, the coated surface of the 5th total reflective mirror (25) and xy face angle are 90 °, and the normal plane of this coated surface is 45 ° with respect to the xz face; P1 light, S3 light and S4 light through after the 5th total reflective mirror (25) reflection all along the forward-propagating of x axle;
Place successively the first convex lens (51) and the second convex lens (52) on the path of P1 light, make these first convex lens (51) and the second convex lens (52) form telescopic system, make simultaneously P1 light, S3 light and S4 light positive incident the first convex lens (51); Place sample cell (6) between two convex lens, make the back focus of the first convex lens (51) in sample cell (6) central authorities;
P1 light, S3 light and S4 light focus on sample cell (6) central authorities a bit after the first convex lens (51), isotope sample common and to be measured interacts and produces the FDFWM signal; P1 light, S3 light, S4 light and FDFWM signal are parallel to each other and advance after the second convex lens (52);
Filter P1 light, S3 light, S4 light with spatial light filter (7), a residual F DFWM signal; Place successively afterwards the 4th polarization spectro cube (34), the 6th total reflective mirror (26) at spatial light filter (7), the cemented surface of the 4th polarization spectro cube (34) and the angle of xy face are 90 °, and the angle of this cemented surface and xz face is 45 °; The coated surface of the 6th total reflective mirror (26) and the angle of xy face are 90 °, and the normal plane of this coated surface is negative 135 ° with respect to the xz face; The FDFWM signal reflects by the 6th total reflective mirror (26) by the 4th polarization spectro cube (34), then, place photodetector (8) on the path of the FDFWM signal after the 6th total reflective mirror (26) reflection, make the light-sensitive surface of FDFWM signal normal incident light electric explorer (8);
(4) centre frequency of scanned laser, and measure the FDFWM signal of isotope sample to be measured with photodetector (8), obtain the FDFWM signal spectrum that changes with the laser instrument centre frequency;
The kind of the peak position judgement isotope sample to be measured of the FDFWM signal spectrum that (5) obtains according to step (4), then according to the kind of isotope sample to be measured, the peak height of FDFWM signal spectrum, obtain the content information of isotope sample to be measured.
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| CN101968434A (en) * | 2010-09-26 | 2011-02-09 | 西北大学 | DFWM (Degenerate Four-Wave Mixing) spectroscopic technology based method for determining date of cultural relics |
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| CN102252975A (en) | 2011-11-23 |
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