CN203747233U - Seed injection type vertical surface launch terahertz parameter generator - Google Patents
Seed injection type vertical surface launch terahertz parameter generator Download PDFInfo
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- CN203747233U CN203747233U CN201420104457.2U CN201420104457U CN203747233U CN 203747233 U CN203747233 U CN 203747233U CN 201420104457 U CN201420104457 U CN 201420104457U CN 203747233 U CN203747233 U CN 203747233U
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Abstract
The utility model relates to a seed injection type vertical surface launch terahertz parameter generator which includes a laser pumping system, a seed optical system and a nonlinear crystal. A pumping pulse laser generated by the laser pumping system and seed pulse light generated by the seed optical system form a certain included angle and go through the nonlinear crystal; and a Raman and infrared active vibration mode of the nonlinear crystal produce a stimulated exciton scattering and produces a nonlinear parametric process: a terahertz wave from 0.6 to 3.0 THz. According to the seed injection type vertical surface launch terahertz parameter generator in the utility model, the new experiment device design is used; as long as the nonlinear crystal size allows, the light spot size of the pumping light and seed light can be arbitrarily large, and the optical distance from the pumping light to the nonlinear crystal can be adjusted; therefore, the pumping light pulse and the seed light pulse are synchronous in time in order to improve the terahertz output energy.
Description
Technical field
The utility model relates to the pouring-in surperficial Vertical Launch Terahertz parameter generator of a kind of seed, belongs to the technical field of THz source.
Background technology
Being excited exciton scattering is a kind of important technology that produces terahertz emission, by some crystal be excited exciton scattering can obtain visible, near-infrared, and the continuously adjustable laser of terahertz wave band.THz source with other technologies, as the THz source of optical rectification, quantum cascade laser and electricity is compared, this based on be excited the Terahertz parameter source of exciton scattering have can encapsulation and integration, working and room temperature, easy to use, be convenient to the advantages such as tuning, line width.Terahertz parameter source is one of the study hotspot in Terahertz generation field always.Now there are the report about Terahertz parameter source in a large number, the crystal LiNbO that they mainly utilize both at home and abroad
3or MgO:LiNbO
3as the working media of non-linear conversion, the coupled modes in these parameter sources are all generally the coupled modes of the vertical surface transmitting of grating coupling, silicon prism, the coupling of silicon prism array and single-point, and output based on the higher THz wave of oscillator produce power.The spot size of the pumping source in this Terahertz parameter source based on oscillator is subject to the restriction of parametric oscillator, and the pulse of three ripples that participates in parametric process walks in asynchronism(-nization), thereby has limited the generation of high-energy THz wave.Therefore can, by the output with acquisition macro-energy THz wave to the improvement of experimental provision, become this area technical problem urgently to be resolved hurrily.
Utility model content
For the deficiencies in the prior art, the utility model provides a kind of seed pouring-in surperficial Vertical Launch Terahertz parameter generator, this generator overcomes the lower shortcoming of THz wave energy that prior art produces, by the appropriate design to experimental provision, to obtain the terahertz wave beam of macro-energy, greatly improve THz wave transformation efficiency, made transformation efficiency improve 2-4 doubly.
The technical solution of the utility model is as follows:
The pouring-in surperficial Vertical Launch Terahertz parameter generator of a kind of seed comprises laser pumping system, seed light system and nonlinear crystal, the seed pulse light that the pumping pulse laser being produced by laser pumping system and seed light system produce is with certain angle process nonlinear crystal, the Raman of described nonlinear crystal and infrared active diaphragm, exciton scattering is excited in generation, produces non-linear parameter process: the THz wave that obtains 0.6-3.0THz.Under nonlinear crystal size allows, increase the spot size of pumping pulse laser and seed pulse light, regulate pumping pulse laser and seed pulse light pulse time delay, to obtain maximum Terahertz energy output.The Terahertz parameter source of Terahertz parameter generator described in the utility model is at the vertical of nonlinear crystal side or be bordering on vertical coupled output.
Preferred according to the utility model, the both ends of the surface of described nonlinear crystal are all coated with the anti-reflection film of 1000nm-1100nm wavelength.Cutting angle is as shown in Fig. 1 10, and the size of all nonlinear crystals in the utility model can be chosen according to specific requirement.
Preferred according to the utility model, the angular range of the angle between the seed pulse light that the pumping pulse laser that described laser pumping system produces and seed light system produce is 0.5-3.0 °, to obtain tuning range as 0.6-3.0THz.
Preferred according to the utility model, the pumping pulse laser that described laser pumping system produces makes it synchronous in time with the seed pulse light that seed light system produces by changing its light path that arrives nonlinear crystal.
Preferred according to the utility model, described laser pumping system is the laser system of the 1-100Hz of the low repetition of flash lamp pumping; Pump power density>=the 20MW/cm of described laser pumping system
2, output wavelength is 1064nm.
The seed pulse light preferred according to the utility model, described seed light system produces, output wavelength is 1066nm-1080nm, repetition rate is 1-100Hz.
Advantage of the present utility model is:
The pouring-in surperficial Vertical Launch Terahertz parameter generator of a kind of seed described in the utility model, use a kind of design of Novel experiment device, under the size of nonlinear crystal allows, the spot size of pump light and seed light can be large arbitrarily, and can regulate pump light to arrive the light path of nonlinear crystal, make pump light pulse and seed optical pulse in time synchronously to improve Terahertz output energy.
Brief description of the drawings
Fig. 1 is the light channel structure schematic diagram of the pouring-in surperficial Vertical Launch Terahertz parameter generator of seed of the present utility model.
Fig. 2 is to be the pulsed seed light pumping MgO:LiNbO that lamp pump exocoel pulsed pump light of the present utility model and TPO produce
3crystal, the light channel structure schematic diagram in the pouring-in surperficial Vertical Launch Terahertz parameter of seed source.
Wherein: 1. pumping laser resonant cavity Effect of Back-Cavity Mirror, 2. constant-temperature cooling system, 3. Q-switch, 4. the polarizer, 5. gain medium, 6. flash-lamp pump pumping system, 7. pumping laser resonant cavity outgoing mirror, 8. half-wave plate, 9. seed light high reflective mirror, 10. Terahertz parameter generator nonlinear crystal, 11.TPO seed light system, 12.OPO seed light system, 13. pump light high reflective mirrors, 14. seed light high reflective mirrors, 15. pump light high reflective mirror 16. seed light beam expanders, 17. pump light beam expanders, 18. displacement platforms, 19. rotation platforms, 20. pump light high reflective mirrors, 21. seed light high reflective mirrors, 22. seed light high reflective mirrors, 23. seed light high reflective mirrors, 24. seed light high reflective mirrors, 25. seed light high reflective mirrors, 26. displacement platforms.
Embodiment
Now for Figure of description and embodiment, the utility model is described in detail, but is not limited to this.
Embodiment 1,
As shown in Figure 2.
The pouring-in surperficial Vertical Launch Terahertz parameter generator of a kind of seed comprises laser pumping system, seed light system and nonlinear crystal, the seed pulse light that the pumping pulse laser being produced by laser pumping system and seed light system produce is with certain angle process nonlinear crystal, the Raman of described nonlinear crystal and infrared active diaphragm, exciton scattering is excited in generation, produces non-linear parameter process: the THz wave that obtains 0.6-3.0THz.Under nonlinear crystal size allows, increase the spot size of pumping pulse laser and seed pulse light, regulate pumping pulse laser and seed pulse light pulse time delay, to obtain maximum Terahertz energy output.The Terahertz parameter source of Terahertz parameter generator described in the utility model is at the vertical of nonlinear crystal side or be bordering on vertical coupled output.
Described nonlinear crystal, described nonlinear crystal is MgO:LiNbO
3or LiNbO
3.The both ends of the surface of described nonlinear crystal are all coated with the anti-reflection film of 1000nm-1100nm wavelength.Cutting angle is as shown in Fig. 1 10, and the size of all nonlinear crystals in the utility model can be chosen according to specific requirement.
Angular range between the seed pulse light that the pumping pulse laser that described laser pumping system produces and seed light system produce is 0.5-3.0 °, to obtain tuning range as 0.6-3.0THz.
The pumping pulse laser that described laser pumping system produces makes it synchronous in time with the seed pulse light that seed light system produces by changing its light path that arrives nonlinear crystal.
Described laser pumping system is the laser system of the 1-100Hz of the low repetition of flash lamp pumping; Pump power density>=the 20MW/cm of described laser pumping system
2, output wavelength is 1064nm.
Described seed light system is TPO(tera-hertz parametric oscillator) produce Stokes pulse laser beam, output wavelength is 1066nm-1080nm, repetition rate is 1-100Hz.
Concrete structure is as follows:
The pouring-in Terahertz parameter of a kind of seed generator comprises pumping laser resonant cavity Effect of Back-Cavity Mirror 1, constant-temperature cooling system 2, Q-switch 3, the polarizer 4, gain medium 5, flash-lamp pump pumping system 6, pumping laser resonant cavity outgoing mirror 7, half-wave plate 8, seed light high reflective mirror 9, the nonlinear crystal 10 in Terahertz parameter source, TPO seed light system 11, pump light high reflective mirror 13,14,15,20, seed light beam expander 16, pump light beam expander 17, displacement platform 18, rotation platform 19.Pump light and seed light enter nonlinear crystal with certain angle and form the pouring-in surperficial Vertical Launch Terahertz parameter generator of seed; 1 and 7 form the resonant cavity of pumping laser vibration, the gain medium 5 of placing in resonant cavity is neodymium-doped yttrium-aluminum garnet (Nd:YAG) laser crystal, electro-optic Q switch 3, the polarizer 4 and flash-lamp pump pumping system 6, the pumping system in common composition Terahertz parameter source, 13,14 and 18 form the delayer of pump light.Based on being excited, the method for work of the pouring-in surperficial Vertical Launch Terahertz parameter generator of seed of exciton scattering is as follows: by flash-lamp pump pumping system 6 excitation laser gain medias 5, the fundamental frequency light producing is exported by laserresonator outgoing mirror 7, adjust polarization state, pump light high reflective mirror 20,13,14,15 and beam expander 16 by half-wave plate 8 and enter nonlinear crystal 10, the pulsed seed light that TPO seed light system 11 produces is through delayer, beam expander, high reflective mirror 9, form an angle and enter in nonlinear crystal 10, due to MgO:LINbO with pump light
3crystal has Raman and infrared active simultaneously, thereby can produce and be excited exciton scattering, amplifies seed light, produces Terahertz output at the position of seed generation total reflection simultaneously.Under crystalline size allows, regulate beam expander 16,17, increase the spot size of pump light and seed light, regulate displacement platform 18 and 26 to reach the light path of crystal to change pump light and seed light, make pump light pulse and seed optical pulse synchronous in time, obtain maximum Terahertz energy output.MgO:LINbO
3crystal 10, as nonlinear dielectric, can effectively produce pump light and Terahertz conversion, according to the different tunable Terahertz output that can obtain within the scope of 0.6-3.0THz of the angle of pump light and seed light.Above-mentioned Nd:YAG laser crystal 5 and flash-lamp pump pumping system 6 all carry out thermostatic control by cooling system, maintain the temperature at 20 DEG C.
Described laser crystal Nd:YAG crystal 5 is of a size of φ 6mm × 10mm, and its doping content is the anti-reflection film (transmitance is greater than 99.8%) that two end faces of 1-at.% are all coated with 1000nm-1100nm wavelength.
Described electric-optically Q-switched device 3 is made up of high voltage source and adjusting Q crystal, and the length of adjusting Q crystal is 40mm, and both ends of the surface are all coated with the anti-reflection film (transmitance is greater than 99.8%) to 1000nm-1100nm wavelength; Modulating frequency is 10Hz.
Described MgO:LiNbO
3the size of crystal 10: crystal length is 65mm, width is 46mm, and crystal is 10mm along the height of z axle, and both ends of the surface are all coated with the anti-reflection film (transmitance is greater than 99.8%) to 1000nm-1100nm wave band.
Described laserresonator Effect of Back-Cavity Mirror 1 is flat mirror, is coated with the high-reflecting film (reflectivity is greater than 99.8%) of 1000nm-1100nm wave band.
Near described laserresonator outgoing mirror 7 plated film transmitance of wavelength 1.064 microns is 80%.
The resonator length of described pumping laser is 370mm.
Described pump light high reflective mirror 13,14,15,20 is flat mirror, is coated with the high-reflecting film (reflectivity is greater than 99.8%) of 1000nm-1100nm wave band.
Described seed light high reflective mirror 9,21,22,23,24,25 is flat mirror, is coated with the high-reflecting film (reflectivity is greater than 99.8%) of 1000nm-1100nm wave band.
Described pump light beam expander 17, both ends of the surface are all coated with the anti-reflection film (transmitance is greater than 99.8%) to 1000nm-1100nm wave band
Described seed light beam expander 16, both ends of the surface are all coated with the anti-reflection film (transmitance is greater than 99.8%) to 1000nm-1100nm wave band.
Workflow: flash-lamp pump pumping system 6 excites neodymium-doped yttrium-aluminum garnet Nd:YAG crystal 5, in the time that electric-optically Q-switched device 3 is closed, pump light transfers reversion particle to and stores; In the time that Q switching 3 is opened, a large amount of reversion particles of saving bit by bit transfer 1064.2nm fundamental frequency light to by stimulated radiation moment; The pulsed seed light that fundamental frequency light is exported also and TPO seed light system produces with high peak power enters into nonlinear crystal MgO:LiNbO with certain angle
3, due to MgO:LiNbO
3the effect of the A1 diaphragm of crystal, can transfer fundamental frequency light to seed light, produces terahertz emission ripple simultaneously.Be that 320mJ, repetition rate are 10Hz at the single pulse energy of 1064.2nm, when pumping angle is fixed as 1.5 °, the voltage magnitude that the single bundle of acquisition terahertz emission is measured by Golay Cell is 13V.
Embodiment 2,
The pouring-in surperficial Vertical Launch Terahertz parameter generator of seed as described in Example 1, its difference is, described seed light system is OPO seed light system 12.
The method of work of the pouring-in surperficial Vertical Launch Terahertz parameter generator of a kind of seed is as follows as described in Example 1:
The seed pulse light that the pumping pulse laser that laser pumping system produces and seed light system produce enters in described nonlinear crystal with certain angle, with in nonlinear crystal, there is Raman and infrared-active crystal diaphragm simultaneously and interact, exciton scattering is excited in generation, seed pulse light strengthens, produce terahertz emission ripple simultaneously, change light path that pumping pulse laser arrives nonlinear crystal to obtain in time synchronous of pumping pulse laser and seed pulse light.Obtain the Terahertz of macro-energy in the vertical coupled outgoing of Stokes laser generation total reflection position.
Claims (6)
1. the pouring-in surperficial Vertical Launch Terahertz parameter generator of seed, it is characterized in that, this generator comprises laser pumping system, seed light system and nonlinear crystal, the seed pulse light that the pumping pulse laser being produced by laser pumping system and seed light system produce is with certain angle process nonlinear crystal, the Raman of described nonlinear crystal and infrared active diaphragm, exciton scattering is excited in generation, produces non-linear parameter process: the THz wave that obtains 0.6-3.0THz.
2. the pouring-in surperficial Vertical Launch Terahertz parameter generator of a kind of seed according to claim 1, is characterized in that, the both ends of the surface of described nonlinear crystal are all coated with the anti-reflection film of 1000nm-1100nm wavelength.
3. the pouring-in surperficial Vertical Launch Terahertz parameter generator of a kind of seed according to claim 1, it is characterized in that, the angular range of the angle between the seed pulse light that the pumping pulse laser that described laser pumping system produces and seed light system produce is 0.5-3.0 °, to obtain tuning range as 0.6-3.0THz.
4. the pouring-in surperficial Vertical Launch Terahertz parameter generator of a kind of seed according to claim 1, it is characterized in that, the pumping pulse laser that described laser pumping system produces makes it synchronous in time with the seed pulse light that seed light system produces by changing its light path that arrives nonlinear crystal.
5. the pouring-in surperficial Vertical Launch Terahertz parameter generator of a kind of seed according to claim 1, is characterized in that, described laser pumping system is the laser system of the 1-100Hz of the low repetition of flash lamp pumping; Pump power density>=the 20MW/cm of described laser pumping system
2, output wavelength is 1064nm.
6. the pouring-in surperficial Vertical Launch Terahertz parameter generator of a kind of seed according to claim 1, is characterized in that, the seed pulse light that described seed light system produces, and output wavelength is 1066nm-1080nm, repetition rate is 1-100Hz.
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| CN201420104457.2U CN203747233U (en) | 2014-03-07 | 2014-03-07 | Seed injection type vertical surface launch terahertz parameter generator |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103825189A (en) * | 2014-03-07 | 2014-05-28 | 山东大学 | Seed injection type surface vertical launching terahertz parameter generator and application thereof |
| CN106253032A (en) * | 2016-10-21 | 2016-12-21 | 华北水利水电大学 | A kind of annular chamber terahertz-wave parametric oscillator |
| CN106410572A (en) * | 2016-10-21 | 2017-02-15 | 华北水利水电大学 | High energy Terahertz wave parametric oscillator |
| CN107453189A (en) * | 2017-09-25 | 2017-12-08 | 中国工程物理研究院激光聚变研究中心 | A kind of thz laser device system |
| CN110954497A (en) * | 2019-12-17 | 2020-04-03 | 山东大学 | Terahertz wave single photon detection and imaging system based on frequency conversion |
| CN111653928A (en) * | 2020-06-16 | 2020-09-11 | 北京工业大学 | Double-synchronous pumping Raman laser amplification device and method |
| WO2021114792A1 (en) * | 2019-12-13 | 2021-06-17 | 华为技术有限公司 | Gain adjuster, gain adjustment method and optical line terminal |
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2014
- 2014-03-07 CN CN201420104457.2U patent/CN203747233U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103825189A (en) * | 2014-03-07 | 2014-05-28 | 山东大学 | Seed injection type surface vertical launching terahertz parameter generator and application thereof |
| CN106253032A (en) * | 2016-10-21 | 2016-12-21 | 华北水利水电大学 | A kind of annular chamber terahertz-wave parametric oscillator |
| CN106410572A (en) * | 2016-10-21 | 2017-02-15 | 华北水利水电大学 | High energy Terahertz wave parametric oscillator |
| CN106410572B (en) * | 2016-10-21 | 2019-01-29 | 华北水利水电大学 | A kind of high-energy terahertz-wave parametric oscillator |
| CN106253032B (en) * | 2016-10-21 | 2019-05-24 | 华北水利水电大学 | A kind of annular chamber terahertz-wave parametric oscillator |
| CN107453189A (en) * | 2017-09-25 | 2017-12-08 | 中国工程物理研究院激光聚变研究中心 | A kind of thz laser device system |
| CN107453189B (en) * | 2017-09-25 | 2023-06-02 | 中国工程物理研究院激光聚变研究中心 | Terahertz laser system |
| WO2021114792A1 (en) * | 2019-12-13 | 2021-06-17 | 华为技术有限公司 | Gain adjuster, gain adjustment method and optical line terminal |
| CN112993731A (en) * | 2019-12-13 | 2021-06-18 | 华为技术有限公司 | Gain adjuster, gain adjusting method and optical line terminal |
| CN112993731B (en) * | 2019-12-13 | 2022-10-04 | 华为技术有限公司 | Gain adjuster, gain adjusting method and optical line terminal |
| CN110954497A (en) * | 2019-12-17 | 2020-04-03 | 山东大学 | Terahertz wave single photon detection and imaging system based on frequency conversion |
| CN111653928A (en) * | 2020-06-16 | 2020-09-11 | 北京工业大学 | Double-synchronous pumping Raman laser amplification device and method |
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