CN204256336U - Self frequency-changing's tera-hertz parametric oscillator - Google Patents
Self frequency-changing's tera-hertz parametric oscillator Download PDFInfo
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- CN204256336U CN204256336U CN201420778053.1U CN201420778053U CN204256336U CN 204256336 U CN204256336 U CN 204256336U CN 201420778053 U CN201420778053 U CN 201420778053U CN 204256336 U CN204256336 U CN 204256336U
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Abstract
The utility model relates to solid state laser and correlation technique, for solving tera-hertz parametric oscillator complex structure, system is difficult to the problem of miniaturization, the technical scheme that the utility model is taked is, self frequency-changing's 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.The utility model is applicable to manufacturing and designing of laser instrument and Related product.
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 of continuously 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 utility model, 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.
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, and 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 also 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.
Compared with the prior art, technical characterstic of the present utility model 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 the utility model self frequency-changing tera-hertz parametric oscillator, 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.The utility model only adopts one piece of crystal, integrate and produce laser and frequency transformation, greatly reduce the size of the type THz source, and structure is simple, design is convenient, does not change physical construction by changing crystal working temperature regulation output wavelength, good stability, 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 acts on, by parametric oscillation, laser is transformed into terahertz wave band, the THz wave direction of propagation produced is identical with laser generation, is collected and reflect outside output cavity by THz wave outgoing mirror 4.
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, and the hot spot that the laser of Optical Fiber Transmission is converted into diameter 320 μm by the incidental condenser lens of pumping source 1 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, and two chamber mirrors are plano-concave mirror, and concave curvature radius is 100mm, lens substrate is K9 glass material, two eyeglass concave surfaces are all coated with 1084nm high-reflecting film, and 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 2Nd: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.Meanwhile, under the nonlinear interaction of self frequency-changing's crystal 2Nd: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 (7)
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, 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 also 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.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113488831A (en) * | 2021-07-09 | 2021-10-08 | 电子科技大学 | Terahertz gas laser of electron beam pumping |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113488831A (en) * | 2021-07-09 | 2021-10-08 | 电子科技大学 | Terahertz gas laser of electron beam pumping |
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Granted publication date: 20150408 Termination date: 20181210 |