CN104503183A - Self-frequency-conversion terahertz parametric oscillator - Google Patents
Self-frequency-conversion terahertz parametric oscillator Download PDFInfo
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- CN104503183A CN104503183A CN201410757225.1A CN201410757225A CN104503183A CN 104503183 A CN104503183 A CN 104503183A CN 201410757225 A CN201410757225 A CN 201410757225A CN 104503183 A CN104503183 A CN 104503183A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/3501—Constructional details or arrangements of non-linear optical devices, e.g. shape of non-linear crystals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S1/00—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range
- H01S1/02—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range solid
Abstract
The invention relates to a solid laser device and a related technology. For solving the problems that the structure of a terahertz parametric oscillator is complicated and the system is difficult to miniaturize, the technical scheme adopted by the invention provides a self-frequency-conversion terahertz parametric oscillator. The self-frequency-conversion terahertz parametric oscillator comprises a pumping source (1), a self-frequency-conversion crystal (2), a resonant cavity (3) and a terahertz wave output mirror (4), wherein pumping light emitted by the pumping source (1) is injected into the self-frequency-conversion crystal (2); activated particles in the self-frequency-conversion crystal (2) absorb the pumping light to generate population inversion; laser oscillation is generated under the feedback of the resonant cavity (3); meanwhile, the self-frequency-conversion crystal (2) has a non-linear effect and is used for carrying out frequency conversion on oscillation laser; the laser is converted into terahertz wavebands through parametric oscillation under the action of the same resonant cavity (3); the transmission direction of generated terahertz waves is the same as that of the laser oscillation; the terahertz waves are collected by the terahertz wave output mirror (4) and are reflected and outputted out of the cavity. The self-frequency-conversion terahertz parametric oscillator is mainly applied to the solid laser devices and non-linear optical frequency conversion fields.
Description
Technical field
The present invention relates to solid state laser and nonlinear optical frequency conversion, be specifically related to a kind ofly utilize one piece of crystal not only to produce laser but also produced the device of terahertz emission simultaneously by frequency transformation.
Technical background
Terahertz (Terahertz or THz) radiation be frequency at 0.1-10THz, representative center frequency is the electromagnetic wave of 1THz, and its wave band, between microwave and infrared ray, is the important electromagnetic wave band of macroelectronics to the transition of microcosmic photonics.THz wave is in fundamental research fields such as physics, chemistry, uranology, molecular spectrum, life science and medical sciences, and the Applied research fields such as medical imaging, safety inspection, environmental monitoring, material analysis, food inspection, radio astronomy, mobile communication, satellite communication and military radar all has great scientific research value and wide application prospect.
Tera-hertz parametric oscillator (TPO) is a kind of important terahertz emission source, has the advantages such as tunable, line width, room temperature running, obtains in recent years and pay attention to widely both at home and abroad.At present, tera-hertz parametric oscillator utilizes the Pulse Nd of macro-energy usually: YAG laser is as pumping source, lithium niobate (LiNbO3) or doped with magnesia lithium niobate (MgO:LiNbO3) is utilized in resonator cavity, to produce parametric oscillation by non-colinear phase matching as nonlinear crystal, and export THz wave by silicon prism-coupled or vertical crystal surface, regulate incident angle of light or resonator cavity can realize tuning (within 2000, being published in the article Tunableterahertz-wave parametric oscillators using LiNbO3and MgO:LiNbO3crystals of IEEE Transactions on Microwave Theory and Techniques with reference to Jun-ichi Shikat etc.) of THz wave.For reducing the threshold value of tera-hertz parametric oscillator further and reducing the volume of device, someone utilizes PPLN as nonlinear crystal, and be placed in laserresonator, laser instrument and parametric oscillator common resonant chamber, namely adopt inner chamber pump mode, the THz wave achieving high repetition frequency exports (the article Compact source ofcontinuously and widely-tunable terahertz radiation being published in Optics Express with reference to T.J.Edwards etc. for 2006).Domestic Duo Jia unit have also been made a large amount of theories and experimental study work (being published in the article " terahertz-wave parametric oscillator progress " of " laser and optoelectronics progress " with reference to Liu Lei etc. for 2012) in the tera-hertz parametric oscillator of pulsed laser pumping.
Following shortcoming and defect is at least there is: the pump laser needed for existing tera-hertz parametric oscillator and parametric oscillator itself are two cover systems in prior art, fundamentally cannot realize miniaturization, even if for comparatively compact inner chamber pumping tera-hertz parametric oscillator, because lasing crystal and the crystal that realizes frequency transformation are not one piece of crystal, resonator cavity also and non-common, effectively cannot compress the volume of whole device to a certain extent; Existing traditional tera-hertz parametric oscillator phase matching mode adopts non-colinear phase matching mostly, and THz wave needs the plane of crystal export structure adopting silicon prism-coupled to export or needs design is complicated; The tuning of tera-hertz parametric oscillator needs the angle changing pumping direction or whole parametric oscillator resonator cavity, and the adjustment of physical construction is unfavorable for the stability of integral device.
Up to now, at home and abroad there is no the generation that the self frequency-changing Nd:PPLN crystal integrating generation laser and nonlinear optical frequency conversion function is used for THz ripple by any report.Self frequency-changing's crystal and Terahertz parametric oscillation combine with technique is adopted in the present invention, to greatly reduce the size of tera-hertz parametric oscillator, and its structure is simple, design easily, tuning manner does not change physical construction, good stability, detects at portable and integrated Terahertz or has significant application value in imaging system.
Summary of the invention
In order to overcome the deficiencies in the prior art, solve tera-hertz parametric oscillator complex structure, system is difficult to the problem of miniaturization.For this reason, the technical scheme that the present invention takes is, self frequency-changing's tera-hertz parametric oscillator, comprising: pumping source (1), self frequency-changing's crystal (2), resonator cavity (3), THz wave outgoing mirror (4); The pump light that pumping source (1) sends injects self frequency-changing's crystal (2), and the active population absorptive pumping light in self frequency-changing's crystal (2) produces population inversion, under the feedback of resonator cavity (3), produce laser generation; Simultaneously, self frequency-changing's crystal (2) has nonlinear effect, frequency transformation is carried out to oscillating laser, under same resonator cavity (3) effect, by parametric oscillation, laser is transformed into terahertz wave band, the THz wave direction of propagation produced is identical with laser generation, is collected by THz wave outgoing mirror (4) and is reflected outside output cavity.
Described pumping source (1) is specially: with direct output semiconductor laser or the coupling fiber output semiconductor laser of condenser lens, and the output wavelength of semiconductor laser is 809nm or 813nm.
A kind of self frequency-changing's tera-hertz parametric oscillator according to claim 1, it is characterized in that, described self frequency-changing's crystal (2) is specially Nd:PPLN crystal, Nd3+ doping content is 0.1%-3%, the polarization cycle of crystal is 20 ~ 120 μm, optical direction length is 10 ~ 50mm, and both ends of the surface are coated with 800 ~ 820nm and 1050 ~ 1100nm anti-reflection film.
Described resonator cavity (3) is made up of two chamber mirrors, and two chamber mirror inner cavity surfaces are all coated with 1084nm high-reflecting film, also needs to be coated with 809 ~ 813nm anti-reflection film near the mirror two sides, chamber of pumping source (1); Two optic formation of described resonator cavity (3) can be level crossing, plano-concave mirror or biconcave mirror, and host material can be K9 glass, quartz, sapphire, YAG, CaF2 etc.
Insert polarizer in described resonator cavity (3), laser rays polarization is operated.
Described resonator cavity (3) inside is inserted initiatively or passive Q-adjusted device, makes laser operate with impulse form and produce pulse THz wave.
Described THz wave outgoing mirror (4) is off axis paraboloidal mirror, and its central shaft is consistent with light path and have diameter 1 ~ 3mm light hole, and reflecting surface is coated with aluminium or golden reflectance coating, and off-axis angle is 45 degree, outside the THz wave vertical optical path output cavity of reflection.
Collinear phase matching condition is met in self frequency-changing's crystal (2) of tera-hertz parametric oscillator, and export Terahertz Wavelength tunable, by controlling the temperature of self-frequency-doubling crystal, angle or polarization cycle, to change the attainable tuning range of wavelength exporting THz wave be 0.1 ~ 3THz.
Compared with the prior art, technical characterstic of the present invention and effect:
The generation of laser and the frequency conversion process of parametric oscillation are combined by one piece of self frequency-changing's crystal and shared resonator cavity by self frequency-changing's tera-hertz parametric oscillator of the present invention, the pump laser and the parametric oscillator that solve existing tera-hertz parametric oscillator are discrete parts, system complex and cannot the problem of miniaturization.Self frequency-changing's tera-hertz parametric oscillator of the present invention, only adopt one piece of crystal, integrate and produce laser and frequency transformation, greatly reduce plant bulk, and its structure is simple, design is convenient, not changing physical construction, good stability by changing crystal working temperature regulation output wavelength, can collinear phase matching be realized, and can continuous wave or impulse form running, portable and integrated Terahertz detect or imaging system in there is significant application value.
Accompanying drawing explanation
The structural representation that a kind of self frequency-changing's tera-hertz parametric oscillator of Fig. 1 exports.
Pulse THz wave embodiment is exported with a kind of self frequency-changing's tera-hertz parametric oscillator of polarizer and acousto-optic Q-switching in Fig. 2 resonator cavity.
Embodiment
The technical solution adopted in the present invention is: a kind of compact self frequency-changing tera-hertz parametric oscillator, comprises pumping source (1), self frequency-changing's crystal (2), resonator cavity (3), THz wave outgoing mirror (4).The pump light that pumping source (1) sends injects self frequency-changing's crystal (2), and the active population absorptive pumping light in self frequency-changing's crystal (2) produces population inversion, under the feedback of resonator cavity (3), produce laser generation.Simultaneously, self frequency-changing's crystal (2) has nonlinear effect, frequency transformation is carried out to oscillating laser, under same resonator cavity (3) effect, by parametric oscillation, laser is transformed into terahertz wave band, the THz wave direction of propagation produced is identical with laser generation, is collected by THz wave outgoing mirror (4) and is reflected outside output cavity.
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
As shown in Figure 2, described pumping source (1) to export and with the semiconductor laser of condenser lens for coupling fiber, the centre wavelength of Output of laser is 809nm, also can be 813nm, the core diameter of energy-transmission optic fibre is 400 μm, numerical aperture is 0.22, the hot spot that the laser of Optical Fiber Transmission is converted into diameter 320 μm by pumping source (1) incidental condenser lens incides in self frequency-changing's crystal (2), and focus point is positioned at 1mm place, self frequency-changing's crystal (2) surface.Described self frequency-changing's crystal (2) is Nd:PPLN crystal, Nd
3+doping content is 0.2%, and polarization cycle is 71 μm, and polarised direction is along crystal z-axis, and crystalline size is 1mm × 5mm × 20mm, and both ends of the surface are coated with 813nm and 1050 ~ 1100nm anti-reflection film.Described resonator cavity (3) is made up of two chamber mirrors, two chamber mirrors are plano-concave mirror, concave curvature radius is 100mm, lens substrate is K9 glass material, two eyeglass concave surfaces are all coated with 1084nm high-reflecting film, the mirror two sides, chamber of pumping source side is also coated with 809 ~ 813nm anti-reflection film simultaneously, and resonator is long is 120mm.Polarizer (6) is inserted in resonator cavity, concrete form is Brewster sheet, the laser rays polarization in chamber can be made to operate, Brewster sheet is K9 glass material, diameter 20mm, become 56.6 ° to place with optical axis, the plane of incidence is consistent with the plane that z-axis and the optical direction of Nd:PPLN crystal are formed, and extinction ratio is greater than 95%.Also insert acousto-optic Q-switching (5) in chamber, acousto-optic medium is fused quartz, and medium length is 30mm, and ultrasound working frequency is 27.14MHz, and driving power is 20W, effectively work aperture 1.8mm, and q-frequency is 20kHz.Described self frequency-changing's crystal (2) Nd:PPLN absorptive pumping light, the energy state of active population by ground state transition to excited state, pump energy is made to be stored in upper laser level, when acousto-optic Q-switching is in closed condition, upper energy level population constantly accumulates and produces a large amount of inverted population, when acousto-optic Q opens, meet laser oscillation condition, realize rapidly violent stimulated radiation by the feedback of resonator cavity to amplify, in resonator cavity, set up the laser generation of linear polarization giant-pulse, polarization direction is consistent with the polarised direction of Nd:PPLN crystal.The wavelength of laser is 1084nm, and pulse repetition rate is consistent with q-frequency is 20kHz.Simultaneously, under the nonlinear interaction of self frequency-changing's crystal (2) Nd:PPLN, 1084nm laser produces parametric oscillation effect under the effect of same described resonator cavity (3), and by laser frequency conversion to terahertz wave band, the THz wave frequency produced under normal temperature is 1.5THz.Arrange paraboloidal mirror in resonator optical axis direction, off-axis angle is 45 °, focal length 100mm, and the anti-oxidation golden reflectance coating of reflecting surface plating, center has diameter to be that the through hole of 1.5mm is to ensure 1084nm laser generation.
Under the dimension limit condition adopting parts, the polarization cycle of such as crystal is 20 or 120 μm, and optical direction length is 10 or 50mm, and both ends of the surface are coated with 800 or 820nm and 1050 or the present invention of 1100nm anti-reflection film also can obtain good result.
In sum, embodiments provide a kind of self frequency-changing's tera-hertz parametric oscillator light device, by self frequency-changing Nd:PPLN crystal and shared resonator cavity by the generation of pumping laser with combined by the parametric oscillation frequency conversion process of pumping laser to THz wave, greatly reduce the size of traditional tera-hertz parametric oscillator, and its structure is simple, design is convenient, physical construction is not changed by changing crystal working temperature regulation output wavelength, good stability, can collinear phase matching be realized, and can continuous wave or impulse form running
The foregoing is only a specific embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. self frequency-changing's tera-hertz parametric oscillator, is characterized in that, comprising: pumping source (1), self frequency-changing's crystal (2), resonator cavity (3), THz wave outgoing mirror (4); The pump light that pumping source (1) sends injects self frequency-changing's crystal (2), and the active population absorptive pumping light in self frequency-changing's crystal (2) produces population inversion, under the feedback of resonator cavity (3), produce laser generation; Simultaneously, self frequency-changing's crystal (2) has nonlinear effect, frequency transformation is carried out to oscillating laser, under same resonator cavity (3) effect, by parametric oscillation, laser is transformed into terahertz wave band, the THz wave direction of propagation produced is identical with laser generation, is collected by THz wave outgoing mirror (4) and is reflected outside output cavity.
2. a kind of self frequency-changing's tera-hertz parametric oscillator according to claim 1, it is characterized in that, described pumping source (1) is specially: with direct output semiconductor laser or the coupling fiber output semiconductor laser of condenser lens, and the output wavelength of semiconductor laser is 809nm or 813nm.
3. self frequency-changing's tera-hertz parametric oscillator as claimed in claim 1, it is characterized in that, a kind of self frequency-changing's tera-hertz parametric oscillator according to claim 1, is characterized in that, described self frequency-changing's crystal (2) is specially Nd:PPLN crystal, Nd
3+doping content is 0.1%-3%, and the polarization cycle of crystal is 20 ~ 120 μm, and optical direction length is 10 ~ 50mm, and both ends of the surface are coated with 800 ~ 820nm and 1050 ~ 1100nm anti-reflection film.
4. self frequency-changing's tera-hertz parametric oscillator as claimed in claim 1, it is characterized in that, described resonator cavity (3) is made up of two chamber mirrors, and two chamber mirror inner cavity surfaces are all coated with 1084nm high-reflecting film, also needs to be coated with 809 ~ 813nm anti-reflection film near the mirror two sides, chamber of pumping source (1); Two optic formation of described resonator cavity (3) can be level crossing, plano-concave mirror or biconcave mirror, and host material can be K9 glass, quartz, sapphire, YAG, CaF
2deng.
5. self frequency-changing's tera-hertz parametric oscillator as claimed in claim 1, is characterized in that, inserts polarizer, laser rays polarization is operated in described resonator cavity (3).
6. self frequency-changing's tera-hertz parametric oscillator as claimed in claim 1, is characterized in that, described resonator cavity (3) inside is inserted initiatively or passive Q-adjusted device, makes laser operate with impulse form and produce pulse THz wave.
7. a kind of self frequency-changing's tera-hertz parametric oscillator according to claim 1, it is characterized in that, described THz wave outgoing mirror (4) is off axis paraboloidal mirror, its central shaft is consistent with light path and have diameter 1 ~ 3mm light hole, reflecting surface is coated with aluminium or golden reflectance coating, off-axis angle is 45 degree, outside the THz wave vertical optical path output cavity of reflection.
8. a kind of self frequency-changing's tera-hertz parametric oscillator according to claim 1, it is characterized in that, collinear phase matching condition is met in self frequency-changing's crystal (2) of tera-hertz parametric oscillator, and export Terahertz Wavelength tunable, by controlling the temperature of self-frequency-doubling crystal, angle or polarization cycle, to change the attainable tuning range of wavelength exporting THz wave be 0.1 ~ 3THz.
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Cited By (6)
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| CN105048274A (en) * | 2015-08-24 | 2015-11-11 | 山东大学 | Passive Q-switched pulse-type self-frequency doubling green light laser |
| CN106898937A (en) * | 2017-02-16 | 2017-06-27 | 中国科学院电子学研究所 | The alkali metal laser of the axial pumping of semiconductor laser side face coupling |
| CN107039874A (en) * | 2016-02-03 | 2017-08-11 | 涩谷工业株式会社 | Terahertz light generating apparatus |
| CN110061413A (en) * | 2019-05-27 | 2019-07-26 | 青岛镭视光电科技有限公司 | Self-frequency-doubling crystal, generating device of laser and laser with refrative cavity |
| CN110954497A (en) * | 2019-12-17 | 2020-04-03 | 山东大学 | Terahertz wave single photon detection and imaging system based on frequency conversion |
| CN113839291A (en) * | 2021-08-24 | 2021-12-24 | 北京遥感设备研究所 | Terahertz radiation source based on non-periodically polarized lithium niobate crystal and acquisition method |
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| CN113839291A (en) * | 2021-08-24 | 2021-12-24 | 北京遥感设备研究所 | Terahertz radiation source based on non-periodically polarized lithium niobate crystal and acquisition method |
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