CN103776550A - Supercontinuum pulse laser measurement device based on nonlinear nano material and method - Google Patents
Supercontinuum pulse laser measurement device based on nonlinear nano material and method Download PDFInfo
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Abstract
The invention discloses a supercontinuum pulse laser measurement device based on a nonlinear nano material and a method. According to the invention, a 1/2 waveplate, a polarized light splitting device, an electric stepping motor, a first high reflection mirror, a second high reflection mirror, a third high reflection mirror, a laser line light filter, a focusing lens, a photonic crystal optical fiber, a collimating lens, a light filter, a fourth high reflection mirror, a fifth high reflection mirror, an achromatic focusing lens, the nonlinear nano material, a collection focusing lens, a spectrometer and a PC; the optical distance of a detection optical path is changed by an optical delay system, and an excitation optical path transmits supercontinuum pulse laser; through the laser line light filter, excitation-detection optical paths are integrated and are converged to the nano material through a focusing system, so as to excite sum frequency spectrums; and through a mobile stepping motor, the sum frequency spectrums are synchronously detected, and the characteristics of a supercontinuum laser pulse are completely detected.
Description
Technical field
The invention belongs to photonics technical field, be specifically related to a kind of super continuous spectrums pulse laser measurement mechanism and method based on non-linear nano material.
Background technology
Pulse width is less than psec (10
-12second) laser of magnitude is often called as ultra-short pulse laser.Due to superpower instantaneous power, ultra-short pulse laser is indispensable experimental tool in the scientific domains such as modern biology, physics.Below in recent years, along with the making of photonic crystal fiber is increasingly mature, the super continuous spectrums pulse laser that ultra-short pulse laser excitation photon crystal optical fibre produces is shown up prominently in sensing, imaging field.Because super continuous spectrums pulse laser has the spectrum of non-constant width, good spatial coherence, has been subject to people and has more and more paid close attention to.But, due to the non-constant width of spectrum of super continuous spectrums pulse laser, also bring the inconvenience of measuring and using.For the more effective super continuous spectrums pulse laser that utilizes, a kind of available measuring method is conscientiously essential.Current, when people measure super continuous spectrums laser, conventionally non-linear body shape crystal is placed in the adjustable device of angle, by the change of angle, adjust the incident angle of laser, coupling phasing degree corresponding to different wave length.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, a kind of super continuous spectrums pulse laser measurement mechanism and method based on non-linear nano material is provided.Non-linear nano material all has good nonlinear characteristic at wide spectral range; And, due to the architectural characteristic of nano material, without considering phase-matching condition.Therefore,, in the super continuous spectrums pulse measuring method based on nano material, without use angle adjustable device, increased greatly the scope of application of the method.
The technical solution adopted for the present invention to solve the technical problems is as follows:
Super continuous spectrums pulse laser measurement mechanism based on non-linear nano material, comprises 1/2 wave plate, polarized light splitting device, electric stepper motor, the first high reflection mirror sheet, the second high reflection mirror sheet, third high reflecting optics, laser rays optical filter, condenser lens, photonic crystal fiber, collimation lens, optical filter, the 4th high reflection mirror sheet, the 5th high reflection mirror sheet, achromatism condenser lens, non-linear nano material, collects condenser lens, spectrometer, PC;
1/2 wave plate is arranged on polarized light splitting device dead ahead, for changing polarization spectro ratio; Ultra-short pulse laser enters polarized light splitting device light splitting after by 1/2 wave plate, and ultra-short pulse laser is divided into two-way laser by polarized light splitting device; Wherein a road laser converges to an end face of photonic crystal fiber by condenser lens, and in the interaction of ultra-short pulse laser and photonic crystal fiber, ultra-short pulse laser is converted into super continuous spectrums laser; Super continuous spectrums laser is from another end face outgoing of photonic crystal fiber, and after collimation lens, collimation is exported; This road laser is defined as excitation light path;
An other road ultra-short pulse laser enters optical delay system, changes the light path of this road ultra-short pulse laser, and along former direction outgoing, this road laser is defined as detection light path;
Excitation light path regulates after transmission direction by the 4th high reflection mirror sheet and the 5th high reflection mirror sheet, the coated surface that is irradiated to laser rays optical filter with angle A (0 ° of <A<15 °), wherein the super continuous impulse laser in excitation light path is reflected; Survey light path and be irradiated to laser rays optical filter transmission with angle B (B=0 °); Excitation light path and detection light path realize the coincidence of propagating light path on the coated surface of laser rays optical filter, and this coincidence light path is defined as pump probe light path;
Pump probe light path is impinged perpendicularly on to the entrance of achromatism condenser lens, pump probe light path focuses on the non-linear nano material on the focal plane that is placed on lens by achromatism condenser lens; Pump probe light path and non-linear nano material interact, and produce quadratic nonlinearity signal;
PC is connected with spectrometer with electric stepper motor simultaneously, and spectrometer is connected with collection condenser lens optical fiber; Spectrometer is for detection of the quadratic nonlinearity signal of transmission.
Described optical delay system comprises electric stepper motor, the first high reflection mirror sheet, the second high reflection mirror sheet, third high reflecting optics; And the first high reflection mirror sheet, the second high reflection mirror sheet are arranged on electric stepper motor, are positioned at same level line and mirror image symmetrical, the second high reflection mirror sheet is arranged on same vertical direction horizontal line and parallel with third high reflecting optics; Ultra-short pulse laser passes through, after the reflection of the first high reflection mirror sheet, the second high reflection mirror sheet, third high reflecting optics, to increase its light path successively; Electric stepper motor can, under the control of PC, change the distance between the second high reflection mirror sheet and third high reflecting optics, thereby controls accurately the recruitment of light path.
Described quadratic nonlinearity signal comprises second harmonic spectral signal, secondary and frequency signal.
Described laser rays optical filter is optical coating optical filter, and its coated surface has the transmissison characteristic of superelevation to ultra-short pulse laser, and super continuous spectrums laser is had to the reflection characteristic of superelevation.
Super continuous spectrums pulse laser measuring method based on non-linear nano material, comprises the steps:
Step 1: ultra-short pulse laser, by after polarized light splitting device, is divided into two-way laser by ultra-short pulse laser; Wherein a road laser converges to an end face of photonic crystal fiber by condenser lens, and in the interaction of ultra-short pulse laser and photonic crystal fiber, ultra-short pulse laser is converted into super continuous spectrums laser; Super continuous spectrums laser is from another end face outgoing of photonic crystal fiber, and after collimation lens, collimation is exported; This road laser is defined as excitation light path, comprises super continuous spectrums laser and the ultra-short pulse laser not being converted;
Step 2: an other road ultra-short pulse laser enters optical delay system, changes the light path of this road ultra-short pulse laser, and along former direction outgoing, this road laser is defined as detection light path;
Step 3: by the 4th high reflection mirror sheet and the 5th high reflection mirror sheet, regulate the transmission direction of excitation light path; Wherein excitation light path is irradiated to the coated surface of laser rays optical filter with angle A (0 ° of <A<15 °), and wherein the super continuous impulse laser in excitation light path is reflected; Survey light path angle B (B=0 °) and be irradiated to laser rays optical filter transmission; Excitation light path and detection light path realize the coincidence of propagating light path on the coated surface of laser rays optical filter, and this coincidence light path is defined as pump probe light path;
Step 4: pump probe light path is impinged perpendicularly on to the entrance of achromatism condenser lens, pump probe light path focuses on the non-linear nano material on the focal plane that is placed on lens by achromatism condenser lens; Pump probe light path and non-linear nano material interact, and produce quadratic nonlinearity signal; Method by cross-correlation detection detects the quadratic nonlinearity signal producing, thereby derives the pulse characteristic of super continuous spectrums laser.
Described in step 2, optical delay system comprises electric stepper motor, the first high reflection mirror sheet, the second high reflection mirror sheet, third high reflecting optics; And the first high reflection mirror sheet, the second high reflection mirror sheet are arranged on electric stepper motor, are positioned at same level line and mirror image symmetrical, the second high reflection mirror sheet is arranged on same vertical direction horizontal line and parallel with third high reflecting optics; Ultra-short pulse laser passes through, after the reflection of the first high reflection mirror sheet, the second high reflection mirror sheet, third high reflecting optics, to increase its light path successively; Electric stepper motor can, under the control of PC, change the distance between the second high reflection mirror sheet and third high reflecting optics, thereby controls accurately the recruitment of light path.
Quadratic nonlinearity signal described in step 4 comprises second harmonic spectral signal, secondary and frequency signal.
Described laser rays optical filter is optical coating optical filter, and its coated surface has the transmissison characteristic of superelevation to ultra-short pulse laser, and super continuous spectrums laser is had to the reflection characteristic of superelevation.
The method of passing through cross-correlation detection described in step 4 detects the quadratic nonlinearity signal producing, and it is specifically described as follows:
4-1. utilizes spectrometer to survey the second harmonic spectral signal producing, and this second harmonic signal produces after acting on respectively non-linear nano material by the ultra-short pulse laser in pump probe light path and super continuous spectrums pulse laser;
4-2. regulates the electric stepper motor in optical delay system, and then changes the distance between the second high reflection mirror sheet and third high reflecting optics; Observe the signal that spectrometer is collected, until secondary and frequency signal detected, this secondary and frequently signal are produced after non-linear nano material by the ultra-short pulse laser in pump probe light path and the acting in conjunction of super continuous spectrums pulse laser simultaneously; When spectrometer detects after secondary and frequency signal, think that now ultra-short pulse laser overlaps in time domain with the pulse signal of super continuous spectrums pulse laser;
4-3. continues the electric stepper motor in mobile optical delay system, until spectrometer detects secondary and frequency blackout; The position of electric stepper motor is now defined as to reference position, start-up time-spectral detection.
Described in step 4-3 time, m-spectral detection is specific as follows:
4-3-1. is from reference position, and oppositely step-length l of mobile electric stepper motor, records current secondary and frequency signal;
4-3-2. circulation execution step 4-3-1, until secondary and frequently signal disappear completely, while thinking, m-spectral detection completes; The secondary of i step-length place record and frequency signal are corresponding to the pulse characteristic in (i-1) l/c～il/c time period in a time pulse of super continuous spectrums pulse laser, and wherein c is the light velocity.
Beneficial effect of the present invention is as follows:
The present invention is by using non-linear nano material, and the secondary and the frequency signal that use the collection of cross-correlation detection method to be produced in non-linear nano material by ultra-short pulse laser and the acting in conjunction of super continuous spectrums pulse laser, thereby the pulse characteristic of measurement super continuous spectrums pulse laser.Due to used nano material as with the generation medium of frequency signal, the method is applicable to the measurement of the super continuous spectrums pulse laser in microcosmos area.
Accompanying drawing explanation
Fig. 1 is apparatus of the present invention schematic diagram.
Fig. 2 is the schematic diagram of optical delay system of the present invention.
Fig. 3 is that the laser rays optical filter in the present invention closes bundle module.
Wherein, 1/2 wave plate 1, polarized light splitting device 2, electric stepper motor 3, the first high reflection mirror sheet 4, the second high reflection mirror sheet 5, third high reflecting optics 6, laser rays optical filter 7, condenser lens 8, photonic crystal fiber 9, collimation lens 10, optical filter 11, the 4th high reflection mirror sheet 12, the 5th high reflection mirror sheet 13, achromatism condenser lens 14, non-linear nano material 15, collection condenser lens 16, spectrometer 17, PC 18; And solid arrow represents ultra-short pulse laser in figure, dotted arrow represents super continuous spectrums pulse laser.
Embodiment
We,, in connection with accompanying drawing, introduce the embodiment of this method in detail below.
As shown in Figure 1, super continuous spectrums pulse laser measurement mechanism based on non-linear nano material, comprises 1/2 wave plate 1, polarized light splitting device 2, electric stepper motor 3, the first high reflection mirror sheet 4, the second high reflection mirror sheet 5, third high reflecting optics 6, laser rays optical filter 7, condenser lens 8, photonic crystal fiber 9, collimation lens 10, optical filter 11, the 4th high reflection mirror sheet 12, the 5th high reflection mirror sheet 13, achromatism condenser lens 14, non-linear nano material 15, collects condenser lens 16, spectrometer 17, PC 18.
1/2 wave plate 1 is arranged on polarized light splitting device 2 dead aheads, for changing polarization spectro ratio; Ultra-short pulse laser enters polarized light splitting device 2 light splitting after by 1/2 wave plate, and ultra-short pulse laser is divided into two-way laser; Wherein a road laser converges to an end face of photonic crystal fiber 9 by condenser lens 8, and in the interaction of ultra-short pulse laser and photonic crystal fiber 12, ultra-short pulse laser is converted into super continuous spectrums laser; Super continuous spectrums laser is from another end face outgoing of photonic crystal fiber 12, and after collimation lens 10, collimation is exported; This road laser is defined as excitation light path.
An other road ultra-short pulse laser enters optical delay system, changes the light path of this road ultra-short pulse laser, and along former direction outgoing, this road laser is defined as detection light path;
As shown in Figure 2, optical delay system comprises electric stepper motor 3, the first high reflection mirror sheet 4, the second high reflection mirror sheet 5, third high reflecting optics 6; And the first high reflection mirror sheet 4, the second high reflection mirror sheet 5 are arranged on electric stepper motor 3, are positioned at same level line and mirror image symmetrical, and the second high reflection mirror sheet 5 is arranged on same vertical direction horizontal line and parallel with third high reflecting optics 6; Ultra-short pulse laser passes through, after the reflection of the first high reflection mirror sheet 4, the second high reflection mirror sheet 5, third high reflecting optics 6, to increase its light path successively; Electric stepper motor can, under the control of PC 18, change the distance between the second high reflection mirror sheet 5 and third high reflecting optics 6, thereby controls accurately the recruitment of light path.
Excitation light path regulates transmission direction by the 4th high reflection mirror sheet 12 and the 5th high reflection mirror sheet 13.Wherein excitation light path is irradiated to the coated surface of laser rays optical filter 7 with angle A, and wherein the super continuous impulse laser in excitation light path is reflected; Survey light path angle B and be irradiated to laser rays optical filter 7 transmission; Excitation light path and detection light path realize the coincidence of propagating light path on the coated surface of laser rays optical filter 7, and this coincidence light path is defined as pump probe light path.
As shown in Figure 3, pump probe light path is impinged perpendicularly on to the entrance of achromatism condenser lens 14, pump probe light path focuses on the non-linear nano material 15 on the focal plane that is placed on lens by achromatism condenser lens 14.Pump probe light path and non-linear nano material 15 interact, and produce quadratic nonlinearity signal; Described quadratic nonlinearity signal comprises second harmonic spectral signal, secondary and frequency signal.
Described PC 18 is connected with spectrometer 17 with electric stepper motor 3 simultaneously, and spectrometer 17 is connected with collection condenser lens 16 optical fiber; Spectrometer 17 is for detection of the quadratic nonlinearity signal of transmission.
Described laser rays optical filter 7 is optical coating optical filter, and its coated surface has the transmissison characteristic of superelevation to ultra-short pulse laser, and super continuous spectrums laser is had to the reflection characteristic of superelevation.
As shown in Figure 1, the super continuous spectrums pulse laser measuring method based on non-linear nano material, comprises the steps:
Step 1: ultra-short pulse laser, by after polarized light splitting device 2, is divided into two-way laser by ultra-short pulse laser; Wherein a road laser converges to an end face of photonic crystal fiber 9 by condenser lens 8, and in the interaction of ultra-short pulse laser and photonic crystal fiber 12, ultra-short pulse laser is converted into super continuous spectrums laser; Super continuous spectrums laser is from another end face outgoing of photonic crystal fiber 12, and after collimation lens 10, collimation is exported.This road laser comprises super continuous spectrums laser and the ultra-short pulse laser not being converted on a small quantity, and this road laser is defined as excitation light path.
Step 2: an other road ultra-short pulse laser enters optical delay system, changes the light path of this road ultra-short pulse laser, and along former direction outgoing, this road laser is defined as detection light path.
As shown in Figure 2, optical delay system comprises electric stepper motor 3, the first high reflection mirror sheet 4, the second high reflection mirror sheet 5, third high reflecting optics 6; And the first high reflection mirror sheet 4, the second high reflection mirror sheet 5 are arranged on electric stepper motor 3, are positioned at same level line and mirror image symmetrical, and the second high reflection mirror sheet 5 is arranged on same vertical direction horizontal line and parallel with third high reflecting optics 6; Ultra-short pulse laser passes through, after the reflection of the first high reflection mirror sheet 4, the second high reflection mirror sheet 5, third high reflecting optics 6, to increase its light path successively; Electric stepper motor can, under the control of PC 18, change the distance between the second high reflection mirror sheet 5 and third high reflecting optics 6, thereby controls accurately the recruitment of light path.
Step 3: by the 4th high reflection mirror sheet 12 and the 5th high reflection mirror sheet 13, regulate the transmission direction of excitation light path.Wherein excitation light path is irradiated to the coated surface of laser rays optical filter 7 with angle A (0 ° of <A<15 °), and wherein the super continuous impulse laser in excitation light path is reflected; Survey light path angle B (B=0 °) and be irradiated to laser rays optical filter 7 transmission; Excitation light path and detection light path realize the coincidence of propagating light path on the coated surface of laser rays optical filter 7, and this coincidence light path is defined as pump probe light path.
Described laser rays optical filter 7 is optical coating optical filter, and its coated surface has the transmissison characteristic of superelevation to ultra-short pulse laser, and super continuous spectrums laser is had to the reflection characteristic of superelevation.
Step 4: pump probe light path is impinged perpendicularly on to the entrance of achromatism condenser lens 14, pump probe light path focuses on the non-linear nano material 15 on the focal plane that is placed on lens by achromatism condenser lens 14.Pump probe light path and non-linear nano material 15 interact, and produce quadratic nonlinearity signal; Described quadratic nonlinearity signal comprises second harmonic spectral signal, secondary and frequency signal.Method by cross-correlation detection detects the quadratic nonlinearity signal producing, thereby derives the pulse characteristic of super continuous spectrums laser;
The described method of passing through cross-correlation detection detects the quadratic nonlinearity signal producing, and its concrete steps are described below:
4-1. utilizes spectrometer 17 to survey the second harmonic spectral signal producing, and this second harmonic signal produces after acting on respectively non-linear nano material by the ultra-short pulse laser in pump probe light path and super continuous spectrums pulse laser.
4-2. regulates the electric stepper motor 3 in optical delay system, and then changes the distance between the second high reflection mirror sheet 5 and third high reflecting optics 6; Observe the signal that spectrometer 17 is collected, until secondary and frequency signal detected, this secondary and frequently signal are produced after non-linear nano material by the ultra-short pulse laser in pump probe light path and the acting in conjunction of super continuous spectrums pulse laser simultaneously.When spectrometer 17 detects after secondary and frequency signal, think that now ultra-short pulse laser overlaps in time domain with the pulse signal of super continuous spectrums pulse laser.
4-3. continues to regulate the electric stepper motor 3 in optical delay system, until spectrometer 17 detects secondary and frequency blackout; The position of electric stepper motor is now defined as to reference position, start-up time-spectral detection; Time m-spectral detection specific as follows:
4-3-1. is from reference position, and oppositely step-length l of mobile electric stepper motor, records current secondary and frequency signal.
4-3-2. circulation execution step 4-3-1, until secondary and frequently signal disappear completely, while thinking, m-spectral detection completes.The secondary of i step-length place record and frequency signal are corresponding to the pulse characteristic in (i-1) l/c～il/c time period in a time pulse of super continuous spectrums pulse laser, and wherein c is the light velocity.
More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand, the present invention is not restricted to the described embodiments, that in above-described embodiment and instructions, describes just illustrates principle of the present invention, and without departing from the spirit and scope of the present invention, the present invention can also have various changes and modifications.
Claims (10)
1. the super continuous spectrums pulse laser measurement mechanism based on non-linear nano material, is characterized in that comprising 1/2 wave plate, polarized light splitting device, electric stepper motor, the first high reflection mirror sheet, the second high reflection mirror sheet, third high reflecting optics, laser rays optical filter, condenser lens, photonic crystal fiber, collimation lens, optical filter, the 4th high reflection mirror sheet, the 5th high reflection mirror sheet, achromatism condenser lens, non-linear nano material, collects condenser lens, spectrometer, PC;
1/2 wave plate is arranged on polarized light splitting device dead ahead, for changing polarization spectro ratio; Ultra-short pulse laser enters polarized light splitting device light splitting after by 1/2 wave plate, and ultra-short pulse laser is divided into two-way laser by polarized light splitting device; Wherein a road laser converges to an end face of photonic crystal fiber by condenser lens, and in the interaction of ultra-short pulse laser and photonic crystal fiber, ultra-short pulse laser is converted into super continuous spectrums laser; Super continuous spectrums laser is from another end face outgoing of photonic crystal fiber, and after collimation lens, collimation is exported; This road laser is defined as excitation light path;
An other road ultra-short pulse laser enters optical delay system, changes the light path of this road ultra-short pulse laser, and along former direction outgoing, this road laser is defined as detection light path;
Excitation light path regulates after transmission direction by the 4th high reflection mirror sheet and the 5th high reflection mirror sheet, is irradiated to the coated surface of laser rays optical filter with angle A, and wherein the super continuous impulse laser in excitation light path is reflected; Survey light path angle B and be irradiated to laser rays optical filter transmission; Excitation light path and detection light path realize the coincidence of propagating light path on the coated surface of laser rays optical filter, and this coincidence light path is defined as pump probe light path;
Pump probe light path is impinged perpendicularly on to the entrance of achromatism condenser lens, pump probe light path focuses on the non-linear nano material on the focal plane that is placed on lens by achromatism condenser lens; Pump probe light path and non-linear nano material interact, and produce quadratic nonlinearity signal;
PC is connected with spectrometer with electric stepper motor simultaneously, and spectrometer is connected with collection condenser lens optical fiber; Spectrometer is for detection of the quadratic nonlinearity signal of transmission.
2. the super continuous spectrums pulse laser measurement mechanism based on non-linear nano material as claimed in claim 1, is characterized in that described optical delay system comprises electric stepper motor, the first high reflection mirror sheet, the second high reflection mirror sheet, third high reflecting optics; And the first high reflection mirror sheet, the second high reflection mirror sheet are arranged on electric stepper motor, are positioned at same level line and mirror image symmetrical, the second high reflection mirror sheet is arranged on same vertical direction horizontal line and parallel with third high reflecting optics; Ultra-short pulse laser passes through, after the reflection of the first high reflection mirror sheet, the second high reflection mirror sheet, third high reflecting optics, to increase its light path successively; Electric stepper motor can, under the control of PC, change the distance between the second high reflection mirror sheet and third high reflecting optics, thereby controls accurately the recruitment of light path.
3. the super continuous spectrums pulse laser measurement mechanism based on non-linear nano material as claimed in claim 1, is characterized in that described quadratic nonlinearity signal comprises second harmonic spectral signal, secondary and frequency signal.
4. the super continuous spectrums pulse laser measurement mechanism based on non-linear nano material as claimed in claim 1, it is characterized in that described laser rays optical filter is optical coating optical filter, its coated surface has the transmissison characteristic of superelevation to ultra-short pulse laser, and super continuous spectrums laser is had to the reflection characteristic of superelevation.
5. the super continuous spectrums pulse laser measuring method based on non-linear nano material, is characterized in that comprising the steps:
Step 1: ultra-short pulse laser, by after polarized light splitting device, is divided into two-way laser by ultra-short pulse laser; Wherein a road laser converges to an end face of photonic crystal fiber by condenser lens, and in the interaction of ultra-short pulse laser and photonic crystal fiber, ultra-short pulse laser is converted into super continuous spectrums laser; Super continuous spectrums laser is from another end face outgoing of photonic crystal fiber, and after collimation lens, collimation is exported; This road laser is defined as excitation light path, comprises super continuous spectrums laser and the ultra-short pulse laser not being converted;
Step 2: an other road ultra-short pulse laser enters optical delay system, changes the light path of this road ultra-short pulse laser, and along former direction outgoing, this road laser is defined as detection light path;
Step 3: by the 4th high reflection mirror sheet and the 5th high reflection mirror sheet, regulate the transmission direction of excitation light path; Wherein excitation light path is irradiated to the coated surface of laser rays optical filter with angle A, and wherein the super continuous impulse laser in excitation light path is reflected; Survey light path angle B (B=0 °) and be irradiated to laser rays optical filter transmission; Excitation light path and detection light path realize the coincidence of propagating light path on the coated surface of laser rays optical filter, and this coincidence light path is defined as pump probe light path;
Described angle A is 0 °～15 °; Angle B is 0 °;
Step 4: pump probe light path is impinged perpendicularly on to the entrance of achromatism condenser lens, pump probe light path focuses on the non-linear nano material on the focal plane that is placed on lens by achromatism condenser lens; Pump probe light path and non-linear nano material interact, and produce quadratic nonlinearity signal; Method by cross-correlation detection detects the quadratic nonlinearity signal producing, thereby derives the pulse characteristic of super continuous spectrums laser.
6. the super continuous spectrums pulse laser measuring method based on non-linear nano material as claimed in claim 5, is characterized in that described in step 2 that optical delay system comprises electric stepper motor, the first high reflection mirror sheet, the second high reflection mirror sheet, third high reflecting optics; And the first high reflection mirror sheet, the second high reflection mirror sheet are arranged on electric stepper motor, are positioned at same level line and mirror image symmetrical, the second high reflection mirror sheet is arranged on same vertical direction horizontal line and parallel with third high reflecting optics; Ultra-short pulse laser passes through, after the reflection of the first high reflection mirror sheet, the second high reflection mirror sheet, third high reflecting optics, to increase its light path successively; Electric stepper motor can, under the control of PC, change the distance between the second high reflection mirror sheet and third high reflecting optics, thereby controls accurately the recruitment of light path.
7. the super continuous spectrums pulse laser measuring method based on non-linear nano material as claimed in claim 5, is characterized in that quadratic nonlinearity signal described in step 4 comprises second harmonic spectral signal, secondary and signal frequently.
8. the super continuous spectrums pulse laser measuring method based on non-linear nano material as claimed in claim 5, it is characterized in that described laser rays optical filter is optical coating optical filter, its coated surface has the transmissison characteristic of superelevation to ultra-short pulse laser, and super continuous spectrums laser is had to the reflection characteristic of superelevation.
9. the super continuous spectrums pulse laser measuring method based on non-linear nano material as claimed in claim 5, is characterized in that the method for passing through cross-correlation detection described in step 4 detects the quadratic nonlinearity signal producing, and it is specifically described as follows:
4-1. utilizes spectrometer to survey the second harmonic spectral signal producing, and this second harmonic signal produces after acting on respectively non-linear nano material by the ultra-short pulse laser in pump probe light path and super continuous spectrums pulse laser;
4-2. regulates the electric stepper motor in optical delay system, and then changes the distance between the second high reflection mirror sheet and third high reflecting optics; Observe the signal that spectrometer is collected, until secondary and frequency signal detected, this secondary and frequently signal are produced after non-linear nano material by the ultra-short pulse laser in pump probe light path and the acting in conjunction of super continuous spectrums pulse laser simultaneously; When spectrometer detects after secondary and frequency signal, think that now ultra-short pulse laser overlaps in time domain with the pulse signal of super continuous spectrums pulse laser;
4-3. continues to regulate the electric stepper motor in optical delay system, until spectrometer detects secondary and frequency blackout; The position of electric stepper motor is now defined as to reference position, start-up time-spectral detection.
10. the super continuous spectrums pulse laser measuring method based on non-linear nano material as claimed in claim 9, while it is characterized in that described in step 4-3, m-spectral detection is specific as follows:
4-3-1. is from reference position, and oppositely step-length l of mobile electric stepper motor, records current secondary and frequency signal;
4-3-2. circulation execution step 4-3-1, until secondary and frequently signal disappear completely, while thinking, m-spectral detection completes; The secondary of i step-length place record and frequency signal are corresponding to the pulse characteristic in (i-1) l/c～il/c time period in a time pulse of super continuous spectrums pulse laser, and wherein c is the light velocity.
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| CN106556588A (en) * | 2016-11-22 | 2017-04-05 | 深圳大学 | Each spectrum composition Annual distribution of ultrafast super continuous spectrums and time coherence measurement instrument |
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| CN105021293A (en) * | 2015-05-14 | 2015-11-04 | 南京邮电大学 | Optical random waveform measuring apparatus based on single-mode fiber |
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| CN105651399B (en) * | 2016-01-15 | 2019-04-19 | 中国科学院上海光学精密机械研究所 | The weak phase measurement device of time domain phase recovery full optical fiber laser pulse and measurement method |
| CN105806494A (en) * | 2016-03-11 | 2016-07-27 | 南京大学 | OPO ultra-short pulse laser pulse width cross-correlation measuring system |
| CN106556588A (en) * | 2016-11-22 | 2017-04-05 | 深圳大学 | Each spectrum composition Annual distribution of ultrafast super continuous spectrums and time coherence measurement instrument |
| CN106556588B (en) * | 2016-11-22 | 2023-03-31 | 深圳大学 | Instrument for measuring time distribution and time consistency of each spectrum component of supercontinuum |
| CN110082296A (en) * | 2018-01-26 | 2019-08-02 | 清华大学 | Optical signal measurement system |
| CN112904354A (en) * | 2021-01-22 | 2021-06-04 | 西安应用光学研究所 | High-precision laser ranging distance simulation device |
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