CN104112975A - Method for enhancing terahertz wave pulses generated by effect between femtosecond laser pulses and gas atoms - Google Patents
Method for enhancing terahertz wave pulses generated by effect between femtosecond laser pulses and gas atoms Download PDFInfo
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- CN104112975A CN104112975A CN201310133815.2A CN201310133815A CN104112975A CN 104112975 A CN104112975 A CN 104112975A CN 201310133815 A CN201310133815 A CN 201310133815A CN 104112975 A CN104112975 A CN 104112975A
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Abstract
The invention discloses a method for enhancing terahertz wave pulses generated by the effect between femtosecond laser pulses and gas atoms. According to the method, high-power a femtosecond laser pulse is focused by a lens and laser second harmonic is generated by a non-linear crystal. The fundamental harmonic and the second harmonic of the laser pulse ionize gas atoms together so as to generate a plasma and terahertz wave pulse radiation. Surplus laser generated in such process is focused by an off-axis paraboloidal mirror for the second time so as to generate a plasma and a terahertz wave pulse. By changing the propagation distance of the terahertz wave pulse generated by the first plasma, the phase difference between the terahertz wave pulse generated by the first plasma and the terahertz wave pulse generated by the second plasma is changed. Coherent superposition is performed on the terahertz wave pulses generated in the two times such that more powerful terahertz wave pulse radiation is generated.
Description
1. technical field
The invention belongs to photovoltaic applications field, relate generally to the method for utilizing femto-second laser pulse to produce terahertz-wave pulse.
2. background technology
THz wave is that frequency is positioned at 0.1-10 Terahertz (1 Terahertz=10
12hertz) electromagnetic wave, in electromagnetic spectrum microwave and infrared between, belong to far infrared electromagnetic.Femto-second laser pulse be pulse duration at several femtoseconds to the laser pulse between hundreds of femtosecond.Due to the ultra-short Time characteristic of femto-second laser pulse, it can produce higher peak power.Have the femto-second laser pulse (pulse energy is greater than micro-Jiao of hundreds of) and gas atom effect of high pulse energy, laser electric field can produce free electron and ion by ionized gas atom, forms plasma.Plasma lifetime is tens microseconds.This process can produce terahertz radiation.Utilize double-colored femto-second laser pulse (fundamental frequency light and its frequency doubled light) and gas atom effect, gas atom by ionization after, electronics is the accelerated photoelectric current that forms in laser electric field, this photoelectric current is a kind of electric current of quick oscillation, its time span is about the time span of laser pulse, and the electromagenetic wave radiation that this oscillating current produces is terahertz radiation.This terahertz radiation is impulse type radiation, and its repetition rate repeats consistent with femto-second laser pulse.Terahertz-wave pulse width is determined by laser pulse width.
3. summary of the invention
After double-colored femto-second laser pulse ionized gas atom, produce plasma and terahertz-wave pulse radiation, through the scattering process of plasma, laser pulse shape and pulsion phase dryness change.In the time that pulsed laser energy is enough high, focus on through the remaining light of the laser of plasma, still can ionization of gas atom, produce plasma and terahertz radiation.The phase relation that the terahertz-wave pulse that these two plasmas produce respectively is not fixed, may be coherent subtraction, may be also that coherent phase is long.
The inventive method is by changing the propagation distance of terahertz-wave pulse of first plasma generation, changes the phase relation of the terahertz-wave pulse that two plasmas produce respectively, and the coherent phase of realizing the two is long.Thereby strengthen the generation of terahertz radiation.From dispersion relation, laser is different with terahertz-wave pulse propagation velocity in air.And the minor alteration of laser pulse propagation distance, can not change the optical property of laser pulse.Therefore this focuses on apart from not changing laser pulse the rule that produces terahertz-wave pulse radiation for the second time.The phase place when terahertz-wave pulse that this distance has changed first plasma generation simultaneously propagates into second plasma, therefore can make the terahertz-wave pulse generation coherent phase of twice generation long, and THz wave conversion efficiency is increased.
4. brief description of the drawings
Below in conjunction with accompanying drawing, the present invention is further described.
Accompanying drawing is the concrete index path of realizing the inventive method.In figure, each several part is described as follows:
1) lens is collector lens, be used for laser focusing pulse produce plasma, focal length of lens scope is 10 centimetres to 20 centimetres; BBO is thinner BBO Crystal, and chemical formula is β-BaB
2o
4, its thickness determines by femtosecond laser pulse width, span at tens microns to hundreds of micron; Plasma1 is first plasma that femto-second laser pulse ionized gas atom produces; OAP1, OAP2, OAP3 is 90 degree off axis paraboloid mirror reflective mirrors, and reflective surface metal-coated membrane can hereby ripple and laser of reflected terahertz; Plasma2 is that OAP2 focuses on second plasma that femto-second laser pulse ionized gas atom produces; Filter is filter, filters laser pulse, sees through THz wave; Dotted line frame is translation stage, as shown in double-head arrow in figure, translation stage can away from or near OAP1;
2) first plasma plasma1 is positioned at the focus place of OAP1, and the THz wave of generation and the remaining light of laser pulse become directional light by OAP1 collimation;
3) second plasma plasma2 produced by the pulse of OAP2 laser focusing, and it is positioned at the focus place of OAP2 and OAP3.After OAP3 collimation, THz wave becomes directional light;
4) OAP2 and OAP3 are all fixed on translation stage.So when fine setting translation stage, changed the light path between OAP1 and OAP2, and do not changed the light path between OAP2, plasma2, OAP3;
5) in light path all optical element and laser beam center all at same level height.
5. embodiment
Fixing OAP2 and OAP3, on translation stage, ensure that lens lens, first plasma plasma1, OAP2, second plasma plasma2, OAP3, filter center are same level height.Build optical system according to optical schematic diagram.Filter is moved between OAP1 and OAP2, measure and record the terahertz-wave pulse amplitude or the energy that now produce.Mobile spectral filter is after OAP3.Fine setting translation stage, changes the distance between OAP1 and OAP2, finds the place of the relevant enhancing of the terahertz-wave pulse that makes two plasma generation.
Claims (2)
1. utilize double-colored femto-second laser pulse to produce a method for terahertz-wave pulse radiation, it is characterized in that: double-colored femto-second laser pulse is basic frequency laser pulse and the double-frequency laser pulse by BBO Crystal frequency multiplication effect generation; Double-colored femto-second laser pulse focuses on ionized gas atom for twice and produces plasma and terahertz-wave pulse radiation; Change the distance that the terahertz-wave pulse of first plasma generation is propagated, make the terahertz-wave pulse generation coherent phase of itself and second plasma generation long.
2. the method for claim 1, is characterized in that: second plasma produced by the pulse of second 90 degree off axis paraboloidal mirror laser focusing, and produces terahertz-wave pulse radiation simultaneously; The terahertz-wave pulse of second plasma generation is collimated by the 3rd off axis paraboloidal mirror; These two off axis paraboloidal mirrors are fixed on translation stage, by fine setting translation stage, change the propagation distance of the terahertz-wave pulse of first plasma generation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310133815.2A CN104112975A (en) | 2013-04-17 | 2013-04-17 | Method for enhancing terahertz wave pulses generated by effect between femtosecond laser pulses and gas atoms |
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| CN201310133815.2A CN104112975A (en) | 2013-04-17 | 2013-04-17 | Method for enhancing terahertz wave pulses generated by effect between femtosecond laser pulses and gas atoms |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105487140A (en) * | 2016-01-19 | 2016-04-13 | 河北大学 | Device for generating stable and controllable plasma photonic crystals and method thereof |
| CN106099624A (en) * | 2016-08-11 | 2016-11-09 | 首都师范大学 | Laser excitation air plasma produces the system and method for high intensity THz wave |
| CN106357221A (en) * | 2016-09-26 | 2017-01-25 | 上海理工大学 | Device for controlling and detecting compressed pulse widths of electronic pulses based on terahertz waves |
| CN107591666A (en) * | 2017-10-23 | 2018-01-16 | 首都师范大学 | A kind of system and method that THz wave is produced using special laser beam |
| CN110133855A (en) * | 2019-05-08 | 2019-08-16 | 上海理工大学 | THz wave salt free ligands transmission method is guided based on plasma column array |
| CN110243807A (en) * | 2019-07-10 | 2019-09-17 | 浙江农林大学 | Multifunctional, air body sensor |
| CN113285340A (en) * | 2021-03-29 | 2021-08-20 | 北京大学 | Device and method for generating intermediate infrared wide-spectrum femtosecond laser |
| CN113534321A (en) * | 2021-07-08 | 2021-10-22 | 上海交通大学 | System and method for generating Bessel terahertz pulse radiation by laser plasma |
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2013
- 2013-04-17 CN CN201310133815.2A patent/CN104112975A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105487140A (en) * | 2016-01-19 | 2016-04-13 | 河北大学 | Device for generating stable and controllable plasma photonic crystals and method thereof |
| CN106099624A (en) * | 2016-08-11 | 2016-11-09 | 首都师范大学 | Laser excitation air plasma produces the system and method for high intensity THz wave |
| CN106099624B (en) * | 2016-08-11 | 2018-08-10 | 首都师范大学 | The system and method that laser excitation air plasma generates high intensity THz wave |
| CN106357221A (en) * | 2016-09-26 | 2017-01-25 | 上海理工大学 | Device for controlling and detecting compressed pulse widths of electronic pulses based on terahertz waves |
| CN106357221B (en) * | 2016-09-26 | 2019-01-15 | 上海理工大学 | Control and detection compression of electronic pulse device based on THz wave |
| CN107591666A (en) * | 2017-10-23 | 2018-01-16 | 首都师范大学 | A kind of system and method that THz wave is produced using special laser beam |
| CN107591666B (en) * | 2017-10-23 | 2023-04-18 | 首都师范大学 | System and method for generating terahertz waves by using special laser beams |
| CN110133855A (en) * | 2019-05-08 | 2019-08-16 | 上海理工大学 | THz wave salt free ligands transmission method is guided based on plasma column array |
| CN110243807A (en) * | 2019-07-10 | 2019-09-17 | 浙江农林大学 | Multifunctional, air body sensor |
| CN113285340A (en) * | 2021-03-29 | 2021-08-20 | 北京大学 | Device and method for generating intermediate infrared wide-spectrum femtosecond laser |
| CN113534321A (en) * | 2021-07-08 | 2021-10-22 | 上海交通大学 | System and method for generating Bessel terahertz pulse radiation by laser plasma |
| CN113534321B (en) * | 2021-07-08 | 2023-05-02 | 上海交通大学 | System and method for generating Bessel terahertz pulse radiation by laser plasma |
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Application publication date: 20141022 |