CN105181590A - Femtosecond laser-based ultrafast phenomenon detection common optical path interference apparatus - Google Patents
Femtosecond laser-based ultrafast phenomenon detection common optical path interference apparatus Download PDFInfo
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- CN105181590A CN105181590A CN201510422202.XA CN201510422202A CN105181590A CN 105181590 A CN105181590 A CN 105181590A CN 201510422202 A CN201510422202 A CN 201510422202A CN 105181590 A CN105181590 A CN 105181590A
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Abstract
A femtosecond laser-based ultrafast phenomenon detection common optical path interference apparatus is applied in the field of optical interference detection, and can effectively solve the problems of complex structure and poor stability of current apparatuses for implementing ultrasonic detection methods. A scheme adopted in the invention is characterized in that an ultrashort pulse emitted by a femtosecond light source vertically incident to a birefringence crystal along a normal, and is divided into two pulses with mutually vertical polarization and certain pulse interval. The two linear polarization pulses go through a 1/4 wave plate in order to convert polarization into circular polarization, a first pulse is pumped, and a reflector is arranged behind to return the optical path according to an original direction. The returned pulses sequentially go through the 1/4 wave plate, the birefringence crystal and a Polaroid, and is interfered, and pumping information is fixed in interference fringe, and is received by CCD. The method has the advantages of simplicity, easy implementation, elimination of various errors caused by non-coaxial optical paths, and strong operability.
Description
Technical field
The invention belongs to the technical field of the ultrafast transient process detection of optics, utilize femtosecond laser extremely short pulse width, to ultrafast transient process quick sampling, time scale can have meticulousr time shutter.Repeatedly pumping is repeated to sample, under the different detection delay time, repeated sampling is carried out to ultrafast process, finally the result that these repeatedly record can be spliced into the dynamic image of ultrahigh time resolution rate.
Background technology
In recent decades, along with the develop rapidly of pulsed laser technique, ultrafast pulsed laser is widely used in various field, opens new direction, creates the cross disciplines such as such as femtosecond photonics, femtophysics.Ultrafast pulsed laser is with its extremely short pulse width, temporal resolution can be provided up to the light probe of femtosecond magnitude, can the transient process of observational record ultra-fast dynamics, the ultrafast processes such as the fracture of such as chemical bond and synthesis, the excitation process of air plasma, the ionization of electronics.Current most widely used general, the most effective technology is femtosecond pumping-detection technology.In general, the relative time-delay of the pump light in pumping-detection process and detection light makes two-beam produce optical path difference by the spatial movement of translation stage to realize, in fact, the optical path difference that the space distribution of complex optical path and the light path loss of device etc. produce often can be large enough to compared with lag line.Therefore, the correct time of pump light and detection light is difficult to accurate control, cannot ensure the time resolution precision detecting ultrafast process.
Summary of the invention
The present invention seeks to solve the problem such as the apparatus structure complexity of traditional pump probe ultrafast phenomena method, poor stability, light path departure be very big, propose a kind of simple and easy stabilising arrangement of interference with common path of the detection ultrafast phenomena based on femtosecond laser.
The interference with common path device of the detection ultrafast phenomena based on femtosecond laser provided by the invention comprises:
Femtosecond light source (1), select the lasing light emitter had compared with short pulse duration width, the polarization state of pulsed light is consistent with x-axis direction, and can add polaroid and realize after light source, the centre wavelength of pulsed light is λ;
Amici prism (2), is arranged on the emitting light path of femtosecond light source, the saturating anti-interface of prism and incident light angle at 45 °, is be the depolarization Amici prism of 1:1 to the saturating inverse ratio of the light intensity of this central wavelength lambda;
Birefringece crystal (3), be arranged on the transmitted light path of Amici prism, the optical axis direction of this birefringece crystal is vertical with incident light direction, parallel with birefringece crystal surface, and angle at 45 ° with the polarization state of light-pulse generator, simple venation is washed off after birefringece crystal, due to birefringence effect, is divided into two subpulses;
λ/4 wave plate (4), is arranged on the transmitted light path of birefringece crystal, the angle at 45 °, polarization direction of the optical axis direction of this λ/4 wave plate and two subpulses;
Pump light source (5), be carried between two subpulses, for exciting the convergent laser bundle of ultrafast phenomena, the time interval of pumping time and second subpulse is Δ t, Δ t is controlled, repeat this process, the ultrafast image with different time delay can be obtained, be spliced into the dynamic image of high time resolution;
Catoptron (6), is arranged on the transmitted light path of λ/4 wave plate, and the surface of this catoptron, perpendicular to incident light direction, makes incident light turn back by former road;
Polaroid (7), be arranged on the reflected light path of Amici prism, surperficial perpendicular to light path, the angle at 45 ° respectively, polarization direction of the optical axis direction of this polaroid and two subpulses, two subpulses are made to have common component on the optical axis direction of polaroid, so that realize interfering;
CCD (8), is arranged on the transmitted light path of polaroid, for recording the interference fringe after two sub-pulse generations interference.
Advantage of the present invention and good effect:
Apparatus of the present invention, compared with traditional pump probe device, have the advantages such as structure is simple, system stability.
Accompanying drawing explanation
Fig. 1 is based on the interference with common path device of the detection ultrafast phenomena of femtosecond laser.
In figure: (1) femtosecond light source, (2) Amici prism, (3) birefringece crystal, (4) λ/4 wave plate, (5) pumping source, (6) catoptron, (7) polaroid, (8) CCD.
Embodiment
Embodiment 1:
As shown in Figure 1, be the schematic diagram of the interference with common path device of the detection ultrafast phenomena based on femtosecond laser, this device comprises:
Femtosecond light source (1), select the lasing light emitter had compared with short pulse duration width, the polarization state of pulsed light is consistent with x-axis direction, and can add polaroid and realize after light source, the centre wavelength of pulsed light is λ;
Amici prism (2), is arranged on the emitting light path of femtosecond light source, the saturating anti-interface of prism and incident light angle at 45 °, is be the depolarization Amici prism of 1:1 to the saturating inverse ratio of this central wavelength lambda;
Birefringece crystal (3), be arranged on the transmitted light path of Amici prism, the optical axis direction of this birefringece crystal is vertical with incident pulse light direction, parallel with birefringece crystal surface, and angle at 45 ° with the polarization state of light-pulse generator, according to the birefringence effect of crystal, when pulse perpendicular to the optical axis direction of birefringece crystal incident and the optical axis of crystal is parallel to plane of crystal time, when so the light of random polarization state is incident to birefringece crystal, in birefringece crystal, beam splitting is o light and the e light of conllinear transmission, o light and e light owing to there being different refractive indexes in crystal, different velocity of propagation is had in crystal, two energy same pulse intervals can be produced certain, the subpulse that polarization direction is vertical,
λ/4 wave plate (4), is arranged on the transmitted light path of birefringece crystal, the angle at 45 ° respectively, polarization direction of the optical axis direction of this λ/4 wave plate and two subpulses;
Pump light source (5), be carried between two subpulses, for exciting the convergent laser bundle of ultrafast phenomena, the time interval of pumping time and second monopulse is Δ t, Δ t is controlled, repeat this process, the ultrafast image with different time delay can be obtained, be spliced into the dynamic image of high time resolution;
Catoptron (6), is arranged on the transmitted light path of λ/4 wave plate, and the surface of this catoptron, perpendicular to incident light direction, makes incident light turn back by former road;
Polaroid (7), be arranged on the reflected light path of Amici prism, surperficial perpendicular to light path, the angle at 45 ° respectively, polarization direction of the optical axis direction of this polaroid and two subpulses, two subpulses are made to have common component on the optical axis direction of polaroid, so that realize interfering;
CCD (8), is arranged on the transmitted light path of polaroid, for recording the interference fringe after two sub-pulse generations interference.
Details are as follows for the course of work of apparatus of the present invention:
(1) xyz three-dimensional cartesian coordinate system is set up using the exit direction of pulse as z-axis direction;
(2) polarization state of monopulse that femtosecond light source 1 sends is the linearly polarized light gone up along the x-axis direction;
(3) after the birefringece crystal 3 at optical axis and x-axis positive dirction angle at 45 °, in birefringece crystal, beam splitting is o light and the e light of conllinear transmission, o light and e light have the regular hour to postpone in the transmit direction, are divided into two subpulses, and two equal polarization states of sub-pulse energy are vertical; The polarization direction of first subpulse and x-axis positive dirction angle at 45 °, the polarization direction of second subpulse becomes 135 ° of angles with the positive dirction of x-axis;
(4) two subpulses become circularly polarized light after λ/4 wave plate 4, and the optical axis of λ/4 wave plate in the y-direction;
(5) between two subpulses, pump light is loaded, pump light and second sub-recurrent interval Δ t;
(6) two subpulses are after catoptron 6 is turned back, λ/4 wave plate is again entered along original optical path, the polarization direction of first subpulse is become from circularly polarized light and becomes 135 ° of angles with the positive dirction of x-axis, and the polarization direction of second subpulse becomes angle at 45 ° with x-axis positive dirction from circularly polarized light;
(7) two subpulses are again through birefringece crystal 3, because the relative index of refraction of two polarization directions is different, therefore two sub-pulse matchings of final outgoing together, polarization state is respectively and becomes 135 ° of angles with x-axis positive dirction angle at 45 ° with the positive dirction of x-axis;
(8) two subpulses enter Amici prism, are reflexed in the light path of y direction;
(9) by Amici prism, subpulse is reflexed to y direction light path, after optical axis polaroid 7 along the x-axis direction, the polarization state of two subpulses becomes consistent with polaroid optical axis direction, and interferes;
(10) by CCD8 recording interference fringe.
The device of this device is coaxial placement, to the spacing of each device without strict demand.
Claims (1)
1., based on an interference with common path device for the detection ultrafast phenomena of femtosecond laser, it is characterized in that this device comprises:
Femtosecond light source (1), select the lasing light emitter had compared with short pulse duration width, the polarization state of pulsed light is consistent with x-axis direction, and can add polaroid and realize after light source, the centre wavelength of pulsed light is λ;
Amici prism (2), is arranged on the emitting light path of femtosecond light source, the saturating anti-interface of prism and incident light angle at 45 °, is be the depolarization Amici prism of 1:1 to the saturating inverse ratio of the light intensity of this central wavelength lambda;
Birefringece crystal (3), be arranged on the transmitted light path of Amici prism, the optical axis direction of this birefringece crystal is vertical with incident light direction, parallel with birefringece crystal surface, and angle at 45 ° with the polarization state of light-pulse generator, simple venation is washed off after birefringece crystal, due to birefringence effect, is divided into two subpulses;
λ/4 wave plate (4), is arranged on the transmitted light path of birefringece crystal, the angle at 45 °, polarization direction of the optical axis direction of this λ/4 wave plate and two subpulses;
Pump light source (5), be carried between two subpulses, for exciting the convergent laser bundle of ultrafast phenomena, the time interval of pumping time and second subpulse is Δ t, Δ t is controlled, repeat this process, the ultrafast image with different time delay can be obtained, be spliced into the dynamic image of high time resolution;
Catoptron (6), is arranged on the transmitted light path of λ/4 wave plate, and the surface of this catoptron, perpendicular to incident light direction, makes incident light turn back by former road;
Polaroid (7), be arranged on the reflected light path of Amici prism, surperficial perpendicular to light path, the angle at 45 ° respectively, polarization direction of the optical axis direction of this polaroid and two subpulses, two subpulses are made to have common component on the optical axis direction of polaroid, so that realize interfering;
CCD (8), is arranged on the transmitted light path of polaroid, for recording the interference fringe after two sub-pulse generations interference.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106770288A (en) * | 2016-12-09 | 2017-05-31 | 江苏大学 | A kind of micro- Polaroid system and method for interference with common path phase |
| CN109782197A (en) * | 2019-02-27 | 2019-05-21 | 中国科学院武汉物理与数学研究所 | Chip atom senses implementation method and its sensor |
| CN113433710A (en) * | 2020-03-23 | 2021-09-24 | 广州印芯半导体技术有限公司 | Polarization beam splitting system |
| CN114326254A (en) * | 2021-12-07 | 2022-04-12 | 西安交通大学 | Femtosecond double-switch optical Kerr gate based on optical birefringence effect and implementation method |
| CN114779456A (en) * | 2022-05-26 | 2022-07-22 | 南开大学 | Compact incident angle adjusting device based on parabolic mirror |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106770288A (en) * | 2016-12-09 | 2017-05-31 | 江苏大学 | A kind of micro- Polaroid system and method for interference with common path phase |
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| CN109782197B (en) * | 2019-02-27 | 2020-11-13 | 中国科学院武汉物理与数学研究所 | Chip atom sensing realization method and sensor thereof |
| CN113433710A (en) * | 2020-03-23 | 2021-09-24 | 广州印芯半导体技术有限公司 | Polarization beam splitting system |
| CN114326254A (en) * | 2021-12-07 | 2022-04-12 | 西安交通大学 | Femtosecond double-switch optical Kerr gate based on optical birefringence effect and implementation method |
| CN114779456A (en) * | 2022-05-26 | 2022-07-22 | 南开大学 | Compact incident angle adjusting device based on parabolic mirror |
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