CN209281121U - A kind of optical difference frequency Terahertz generating means based on Distributed Feedback Laser - Google Patents
A kind of optical difference frequency Terahertz generating means based on Distributed Feedback Laser Download PDFInfo
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- CN209281121U CN209281121U CN201920090775.0U CN201920090775U CN209281121U CN 209281121 U CN209281121 U CN 209281121U CN 201920090775 U CN201920090775 U CN 201920090775U CN 209281121 U CN209281121 U CN 209281121U
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Abstract
The utility model embodiment provides a kind of optical difference frequency Terahertz generating means based on Distributed Feedback Laser, the narrow linewidth Semiconductor DFB optical fiber laser of main locking phase close and mutual including two wavelength and the resonant cavity of built-in nonlinear crystal, after two beam seed lasers of two optical fiber laser outputs close beam, enter fiber amplifier by isolator to amplify, after amplified laser beam reshaping output, the spatial polarization state of the laser of output is adjusted by polarization adjuster again, in the laser injection resonant cavity of output, laser frequency is converted to terahertz wave band by parametric oscillation, the thz laser of generation is collected by THz wave outgoing mirror and is exported by resonance intracavity reflecting.The utility model THz source reduces the volume of device by using optical fiber laser, can greatly reduce whole device size, and structure is simple, and design is convenient, has significant application value in portable and integrated Terahertz detection or imaging system.
Description
Technical field
The utility model belongs to Terahertz Technology field, is related to a kind of novel THz source, in particular to one kind is based on
The optical difference frequency Terahertz of Distributed Feedback Laser (Distributed Feedback Laser, distributed feedback laser) generates dress
It sets.
Background technique
Terahertz (Terahertz, THz, 1THz=1012Hz) radiation refers generally to wavelength at 30 ~ 3000 μm, i.e., frequency exists
Electromagnetic wave within the scope of 0.1 ~ 10THz, the wave band radiation have very big scientific research value and not yet completely exploitation, physics,
The basic fields such as chemistry, astronomy, molecular spectrum, life science and medical science and medical imaging, environmental monitoring, material
The Applied research fields such as detection, food inspection, radio astronomy, mobile communication, satellite communication and military radar all have great
Scientific research value and wide application prospect.Terahertz emission source receives extensive pass as the powerful of future application
Note obtains efficient THz source as Terahertz Technology and its key of application field.
In the electronics and optical means of various relevant terahertz generations, applied nonlinear optics difference frequency is generated
The second nonlinear interaction process of (difference frequency generation, DFG) technology can produce terahertz
Hereby radiate, because DFG have width it is tunable, it is inexpensive, compact-sized, at room temperature steady running, the good characteristics such as be easily achieved,
Gradually favor for researcher.About the selection of nonlinear crystal in nonlinear optical conversion, have 3-5 mu m waveband is the most frequently used
MgO:LN and PPLN etc. has many advantages, such as high-gain, without escaping, and grow skill since periodic structure PPLN crystal is at low cost
Art is very mature, therefore is widely used in continuous and high duplicate DFG infrared light supply system.In the art, as
The tera-hertz parametric oscillator of THz source usually using the pulse Nd:YAG laser of big energy as pumping source, utilizes niobic acid
Lithium (LiNbO3) or mix magnesia lithium niobate (MgO:LiNbO3) it is used as nonlinear crystal, pass through non-colinear phase in resonant cavity
Matching generates Terahertz parametric oscillation, and exports THz wave by silicon prism-coupled or vertical crystal surface, adjusts incident light
The tuning of THz wave may be implemented in angle or resonator parameter, and the relevant technologies content can refer to Jun-ichi Shikat etc.
It is published within 2000 the article of IEEE Transactions on Microwave Theory and TechniquesTunable terahertz-wave parametric oscillators using LiNbO 3 and MgO:LiNbO 3 crystals；For
It further decreases the threshold value of tera-hertz parametric oscillator and reduces the volume of device, delivered with reference to T.J.Edwards etc. 2006
In the article of Optics ExpressCompact source of continuously and widely-tunable terahertz radiation, using PPLN as nonlinear crystal, and it is intracavitary to place it in laser resonance, by laser
With parametric oscillator common resonant chamber, that is, inner cavity pump mode is used, realizes the THz wave output of high repetition frequency.
Shortcomings and deficiency are still had in the existing Terahertz generation technique using DFG.For in nonlinear crystal
The scheme for carrying out difference frequency not can guarantee as needing laser light source similar in two wavelength and utilize solid-state laser dual wavelength
In the case where operating, it can also make the high stability of output wavelength, line width is relatively narrow, and can not fundamentally realize miniaturization, i.e.,
It is that tera-hertz parametric oscillator is pumped for more compact inner cavity, due to generating the crystal of laser and realizing frequency transformation
Crystal is not one piece of crystal, and resonant cavity also and non-common, can not be effectively compressed the volume of whole device to a certain extent；It is existing
Tera-hertz parametric oscillator phase matched mode mostly use non-colinear phase matched greatly, but the output of THz wave needs to use
The output of silicon prism-coupled needs to design complicated plane of crystal export structure；Meanwhile the tuning of tera-hertz parametric oscillator needs
Change the angle of pumping direction or entire parametric oscillator resonant cavity, the adjustment of mechanical structure is also unfavorable for the steady of integral device
It is qualitative.
In conclusion development system is simple, the THz source of Miniaturizable and function admirable has become researcher urgently
Practical problem to be solved.
Summary of the invention
The technical problems to be solved in the utility model is for overcome the deficiencies in the prior art, to solve existing using terahertz
Hereby structure is complicated, system is difficult to the problem of minimizing for the THz source of parametric oscillator, provides a kind of based on Distributed Feedback Laser
Optical difference frequency Terahertz generating means, can effectively reduce plant bulk, be conducive to portable application and integrated, and have structure letter
Single, steady operation and other merits.
In order to solve the above technical problems, the embodiments of the present invention provide a kind of optical difference frequency based on Distributed Feedback Laser
Terahertz generating means, including the first optical fiber laser, the second optical fiber laser, resonant cavity, optical-fiber bundling device, isolator, guarantor
Polarisation fiber amplifier, output coupling mirror and polarization adjuster；First optical fiber laser and second optical fiber laser are locked
Phase, dual-laser device are narrow linewidth semiconductor DFB, and the output of polarization-maintaining tail optical fiber, the difference frequency for exporting laser is terahertz wave band；
The resonant cavity includes front cavity mirror and Effect of Back-Cavity Mirror, further includes the nonlinear crystal and Terahertz being set in the resonator optical axis
Wave outgoing mirror；Wherein:
First optical fiber laser and two beam seed lasers of second optical fiber laser output pass through the optical fiber
Bundling device is amplified using the isolator into the polarization maintaining optical fibre amplifier after closing beam, and amplified laser beam is through institute
Output coupling mirror shaping output is stated, then adjusts the spatial polarization state of the laser exported by the polarization adjuster, expires polarization state
The laser of the condition of the foot nonlinear crystal quasi-phase matched, output is injected in the resonant cavity by the front cavity mirror, in institute
It states in resonant cavity and is converted laser frequency to terahertz wave band by parametric oscillation, the thz laser direction of propagation of generation and swash
Light generation is identical, and thz laser is collected by the THz wave outgoing mirror and reflects the resonant cavity.
Preferably, the output coupling mirror front and fiber coupling, rear portion are provided with shaping lens, carry out to laser whole
Shape makes the shaping of the laser of output is with a tight waist to be located at the nonlinear crystal center by front position.
Preferably, the front cavity mirror and Effect of Back-Cavity Mirror are respectively any in plane mirror, plano-concave mirror and biconcave mirror.
Preferably, the front cavity mirror two sides is coated with to first optical fiber laser and second optical fiber laser outgoing
The anti-reflection film of laser wavelength, the Effect of Back-Cavity Mirror are coated with the reflectance coating of corresponding wave band on the inside of the resonant cavity, and usual reflectivity is
90% or so.
Preferably, the THz wave outgoing mirror is off axis paraboloidal mirror, and central shaft is consistent with the resonator optical axis,
The off axis paraboloidal mirror is provided with the light hole of 1 ~ 3mm of diameter in optical axis position, and the reflecting surface of the off axis paraboloidal mirror is coated with
Reflectance coating.It is further preferred that the off axis paraboloidal mirror off-axis angle is 45 °, the thz laser of reflection is vertically described
The optical axis of resonant cavity exports.
The utility model embodiment above-mentioned technical proposal has the beneficial effect that
Using the DFB optical fiber laser Injection seeded laser of two locking phases, the stability of wavelength, optical fiber laser ensure that
Use reduce the volume of device, can greatly reduce whole device size, solve in the prior art because of Terahertz parameter
The problem of pump laser and parametric oscillator of oscillator are system complex caused by discrete part and can not minimize；This reality
The THz source structure provided with new embodiment is simple, and design is convenient, can adjust output wave by changing crystal operating temperature
Long without changing mechanical structure, stability is good, may be implemented collinear phase matching, and can according to different configurations with continuous wave or
Impulse form operating has significant application value in portable and integrated Terahertz detection or imaging system.
Detailed description of the invention
Fig. 1 is a kind of optical difference frequency Terahertz generating means based on Distributed Feedback Laser provided by the embodiment of the utility model
Structural schematic diagram；
Fig. 2 is one in the optical difference frequency Terahertz generating means provided by the embodiment of the utility model based on Distributed Feedback Laser
The structural schematic diagram of kind polarization maintaining optical fibre amplifier.
[ main element symbol description ]
1-1: the first optical fiber laser；1-2: the second optical fiber laser；1-3: optics phase locking unit；2: optical-fiber bundling device；
3: isolator；4: polarization maintaining optical fibre amplifier；4-1: wavelength division multiplexer；4-2: optical pump source；4-3: detection coupling follower；4-4: it mixes
Miscellaneous polarization maintaining optical fibre；4-5: extra pumping source outgoing mirror；5: output coupling mirror；6: polarization adjuster；7: resonant cavity；7-1: front cavity mirror；
7-2: Effect of Back-Cavity Mirror；7-3: nonlinear crystal；7-4: THz wave outgoing mirror.
Specific embodiment
In order to make the technical problems, technical solutions and advantages to be solved by the utility model clearer, below in conjunction with attached drawing
And specific embodiment is described in detail.Term " first ", " second " are only used for description mesh in the description of the present invention,
, it is not understood to indicate or imply relative importance.
The utility model is directed to existing problem, provides a kind of optical difference frequency Terahertz generation dress based on Distributed Feedback Laser
It sets, as shown in Figure 1, the THz source is by the first optical fiber laser 1-1, the second optical fiber laser 1-2, resonant cavity 7, optical-fiber bundling
Device 2, isolator 3, polarization maintaining optical fibre amplifier 4, output coupling mirror 5 and polarization adjuster 6 form, wherein resonant cavity 7 includes ante-chamber
The nonlinear crystal 7-3 that is set gradually in optical path between mirror 7-1 and Effect of Back-Cavity Mirror 7-2 and front cavity mirror 7-1 and Effect of Back-Cavity Mirror 7-2 and
THz wave outgoing mirror 7-4.
As shown in Figure 1, exporting two beam seeds by the first optical fiber laser 1-1 and with its locking phase the second optical fiber laser 1-2
Laser, two beam seed lasers first pass through optical-fiber bundling device 2 and close beam, are put using isolator 3 into polarization maintaining optical fibre amplifier 4
Greatly, coupled 5 shaping of the outgoing mirror output of amplified laser beam, then it is inclined by the space that polarization adjuster 6 adjusts the laser of output
Polarization state, the laser of output is by being converted laser frequency by parametric oscillation in resonant cavity 7 in front cavity mirror 7-1 injection resonant cavity 7
To terahertz wave band, the thz laser direction of propagation of generation is identical as laser generation, and thz laser is exported by THz wave
Mirror 7-4 is collected and is reflected resonant cavity 7.
Each component is specifically provided that
First optical fiber laser 1-1 and the second optical fiber laser 1-2 is narrow linewidth semiconductor DFB, polarization-maintaining tail
Fibre output, selects the output frequency of two optical fiber lasers, guarantees that the difference frequency of output laser is terahertz wave band；It is usually common
The central wavelength of two optical fiber lasers is 1550nm or 1064nm wave band nearby.
First optical fiber laser 1-1 needs and the second optical fiber laser 1-2 locking phase is so that the two beam kinds that dual-laser device exports
Sub- laser keeps same phase after closing beam, as a kind of method of locking phase, as shown in Figure 1, optics phase locking unit 1- can be used
3, the laser that acquisition bundling device 2 exports is reference light, and controls the second optical fiber laser 1-2 by electric feedback link and export laser
The frequency of signal makes the second optical fiber laser 1-2 track the output frequency of the first optical fiber laser 1-1, and two beam seeds is kept to swash
Constant difference on the frequency between light.
Polarization maintaining optical fibre amplifier 4 be used as a separate modular, for amplify input conjunction beam seed laser, amplifier can
Think single-stage amplification or multistage MOPA(master oscillation power amplification, Master Oscillator Power-
Amplifier) structure.As a kind of specific embodiment, as shown in Fig. 2, polarization maintaining optical fibre amplifier 4 by wavelength division multiplexer 4-1,
Optical pump source 4-2, detection coupling follower 4-3, doping polarization maintaining optical fibre 4-4 and extra pumping source outgoing mirror 4-5 composition, optical pump source 4-2
The pump light of output is coupled into doping polarization maintaining optical fibre 4-4 through wavelength division multiplexer 4-1 and detection coupling follower 4-3 and amplifies,
It is exported again through extra pumping source outgoing mirror 4-5 to next stage, doping particle therein and two optical fiber laser central wavelength phases
Match；It as more preferably embodiment, can also increase Q-switch in polarization maintaining optical fibre amplifier 4, AOM(Acousto- is such as set
Optical Modulators, acousto-optic modulator), make the output pulse thz laser of THz source.
5 front of output coupling mirror and fiber coupling, rear portion are provided with shaping lens, for carrying out shaping to laser, make defeated
Front position is leaned at the shaping of the laser out center nonlinear crystal 7-3 with a tight waist that is located at.
Polarization adjuster 6 is usually to be made of the polarization splitting prism of a half slide and small size High Extinction Ratio
Small modular device, for adjust output laser spatial polarization state, make output polarization state meet nonlinear crystal 7-3
The required polarization state of quasi-phase matched.
Resonant cavity 7 is made of front cavity mirror 7-1 and Effect of Back-Cavity Mirror 7-2；Front cavity mirror 7-1 and Effect of Back-Cavity Mirror 7-2 shape do not limit especially
System, may respectively be it is any in plane mirror, plano-concave mirror and biconcave mirror, host material can for K9 glass, quartz, sapphire,
YAG、CaF2Deng；As more preferably embodiment, the two sides front cavity mirror 7-1 close to polarization adjuster 6 is coated with to the first optical fiber
The anti-reflection film of laser 1-1 and the second optical fiber laser 1-2 shoot laser wave band, and Effect of Back-Cavity Mirror 7-2 is towards one in resonant cavity 7
Side is coated with the reflectance coating of same wave band, and reflectivity is usually 90% or so；Multicycle PPLN crystal can be used in nonlinear crystal 7-3；Too
Off axis paraboloidal mirror can be used in Hertz wave outgoing mirror 7-4, and central shaft is consistent with 7 optical axis of resonant cavity, and off axis paraboloidal mirror is in light
Shaft position is provided with the light hole of 1 ~ 3mm of diameter, and the reflecting surface of off axis paraboloidal mirror is coated with reflecting surface and is coated with the anti-of aluminium or golden material
Penetrate film；As more preferably embodiment, off axis paraboloidal mirror off-axis angle is 45 °, and the thz laser for reflecting it is vertically humorous
The optical axis output of vibration chamber 7.
Above-described embodiment is put by using narrow linewidth Semiconductor DFB optical fiber laser Injection seeded laser similar in wavelength
It is used as dual wavelength difference frequency light source after big, the parametric oscillation frequency conversion process of pumping laser and THz wave is combined together,
The size of traditional tera-hertz parametric oscillator is greatly reduced, structure is simple, and design is convenient, can not change mechanical structure
Under the premise of by change nonlinear crystal operating temperature adjust output wavelength, while can also pass through adjust DFB optical fiber laser
Wavelength realize the tuning of Terahertz wavelength, device stability is good.
The specific component of THz source and parameter setting as an example is as follows:
First optical fiber laser of narrow linewidth Semiconductor DFB type and the second optical fiber laser central wavelength are respectively
1528.72nm and 1559.39nm, band polarization-maintaining tail optical fiber export, power 80mW, line width 20MHz；By optical-fiber bundling device and every
From device, then by MOPA type polarization maintaining optical fibre amplifier by power amplification to continuous optical power 150W；Before resonant cavity is by plano-concave mirror-type
Hysteroscope and Effect of Back-Cavity Mirror composition, a length of 120mm of resonator, hysteroscope concave curvature radius are 100mm, and lens substrate is K9 glass material
Matter, the front cavity mirror two sides close to polarization adjuster side are coated with 1528 ~ 1560nm anti-reflection film, and the Effect of Back-Cavity Mirror two sides of the other side is coated with
The reflectance coating of 1528 ~ 1560nm wave band 90%；The nonlinear crystal of intracavitary setting selects MgO:PPLN crystal, crystalline size 1mm
× 5mm × 20mm, crystal both ends of the surface are coated with 1528 ~ 1560nm anti-reflection film, and MgO doping concentration is 5mol%, and polarization cycle is 96 μ
M, polarization direction is along crystal z-axis；It is exported through the amplified laser of polarization maintaining optical fibre amplifier by output coupling mirror shaping, output swashs
Light is converted into 320 μm of diameter of hot spot, is incident on focus point when on the nonlinear crystal in resonant cavity and is located in crystal at 8mm,
Adjusting Laser Beam Polarization direction by polarization adjuster keeps it consistent with the polarization direction of PPLN crystal in resonant cavity, realizes e+
The conllinear matching of the quasi- phase of e → e eliminates non-colinear vertical surface output bring somewhat complex design；Laser is inputted in resonance
Parametric oscillation effect is generated under the action of chamber, by laser frequency conversion to terahertz wave band, the Terahertz wave frequency that is generated under room temperature
Rate is 1.5THz；Arrange that paraboloidal mirror, off-axis angle are 45 °, focal length 100mm on resonator optical axis, reflecting surface plating is anti-oxidation
Golden reflectance coating, center have through-hole of the diameter for 1.5mm to guarantee that dual-wavelength laser passes through, which collects resonant cavity
Interior THz wave and the direction for being reflexed to 7 optical axis of vertical cavity export thz laser.
For above-mentioned the embodiments of the present invention, the common sense such as well known specific structure and characteristic are not made excessively in scheme
Description；Each embodiment is described in a progressive manner, and involved technical characteristic is not constituted between each other in each embodiment
It can be combined with each other under the premise of conflict, same and similar part may refer to each other between each embodiment.
The above is preferred embodiments of the present invention, it is noted that for the ordinary skill of the art
For personnel, under the premise of not departing from principle described in the utility model, it can also make several improvements and retouch, these improvement
It also should be regarded as falling into the protection scope of the utility model with retouching.
Claims (7)
1. a kind of optical difference frequency Terahertz generating means based on Distributed Feedback Laser, including the first optical fiber laser (1-1), second
Optical fiber laser (1-2) resonant cavity (7), which is characterized in that first optical fiber laser (1-1) and second optical fiber swash
Light device (1-2) locking phase, dual-laser device are narrow linewidth semiconductor DFB, and polarization-maintaining tail optical fiber exports, and the difference frequency for exporting laser is
Terahertz wave band；The resonant cavity (7) includes front cavity mirror (7-1) and Effect of Back-Cavity Mirror (7-2), further includes being set to the resonant cavity
(7) nonlinear crystal in optical axis (7-3) and THz wave outgoing mirror (7-4)；The Terahertz generating means further include optical fiber
Bundling device (2), isolator (3), polarization maintaining optical fibre amplifier (4), output coupling mirror (5) and polarization adjuster (6), in which:
Described in the two beam seed lasers warp of first optical fiber laser (1-1) and second optical fiber laser (1-2) output
Optical-fiber bundling device (2) closes beam, and the laser beam after closing beam enters the polarization maintaining optical fibre amplifier (4) using the isolator (3)
It amplifies, amplified laser beam is exported through the output coupling mirror (5) shaping, then is adjusted by the polarization adjuster (6)
The spatial polarization state of the laser of output makes polarization state meet the condition of the nonlinear crystal quasi-phase matched, the laser of output
It is injected in the resonant cavity (7) by the front cavity mirror (7-1), passes through parametric oscillation in the resonant cavity (7) for laser frequency
Conversion is to terahertz wave band, and the thz laser direction of propagation of generation is identical as laser generation, and thz laser is by the terahertz
Hereby wave outgoing mirror (7-4) is collected and reflects the resonant cavity (7).
2. Terahertz generating means according to claim 1, which is characterized in that output coupling mirror (5) front and light
Fine coupling, rear portion are provided with shaping lens, carry out shaping to laser, keep the shaping of the laser of output with a tight waist positioned at described non-linear
Front position is leaned at the crystal center (7-3).
3. Terahertz generating means according to claim 1, which is characterized in that the front cavity mirror (7-1) and Effect of Back-Cavity Mirror (7-
It 2) is respectively any in plane mirror, plano-concave mirror and biconcave mirror.
4. Terahertz generating means according to claim 1, which is characterized in that front cavity mirror (7-1) two sides is coated with increasing
Permeable membrane.
5. Terahertz generating means according to claim 1, which is characterized in that the Effect of Back-Cavity Mirror (7-2) is in the resonance
Reflectance coating is coated on the inside of chamber (7).
6. Terahertz generating means according to any one of claims 1 to 5, which is characterized in that the THz wave output
Mirror (7-4) is off axis paraboloidal mirror, and central shaft is consistent with the resonant cavity (7) optical axis, and the off axis paraboloidal mirror is in optical axis
Position is provided with the light hole of 1 ~ 3mm of diameter, and the reflecting surface of the off axis paraboloidal mirror is coated with reflectance coating.
7. Terahertz generating means according to claim 6, which is characterized in that the off axis paraboloidal mirror off-axis angle is
45 °, reflection thz laser vertically the resonant cavity (7) optical axis output.
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Cited By (5)
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| CN110672548A (en) * | 2019-09-18 | 2020-01-10 | 雄安华讯方舟科技有限公司 | Terahertz multimode continuous wave amplitude spectrum system and terahertz signal generating device |
| CN110954497A (en) * | 2019-12-17 | 2020-04-03 | 山东大学 | Terahertz wave single photon detection and imaging system based on frequency conversion |
| US20220113606A1 (en) * | 2020-10-08 | 2022-04-14 | Electronics And Telecommunications Research Institute | Terahertz signal generation apparatus and terahertz signal generation method using the same |
| CN115390336A (en) * | 2022-09-14 | 2022-11-25 | 中国电子科技集团公司第四十一研究所 | Optical difference frequency terahertz wave generation device and method based on lithium niobate crystal |
| CN116417888A (en) * | 2021-12-31 | 2023-07-11 | 上海频准激光科技有限公司 | Multiband single-frequency laser output system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110672548A (en) * | 2019-09-18 | 2020-01-10 | 雄安华讯方舟科技有限公司 | Terahertz multimode continuous wave amplitude spectrum system and terahertz signal generating device |
| CN110954497A (en) * | 2019-12-17 | 2020-04-03 | 山东大学 | Terahertz wave single photon detection and imaging system based on frequency conversion |
| US20220113606A1 (en) * | 2020-10-08 | 2022-04-14 | Electronics And Telecommunications Research Institute | Terahertz signal generation apparatus and terahertz signal generation method using the same |
| US11609474B2 (en) * | 2020-10-08 | 2023-03-21 | Electronics And Telecommunications Research Institute | Terahertz signal generation apparatus and terahertz signal generation method using the same |
| CN116417888A (en) * | 2021-12-31 | 2023-07-11 | 上海频准激光科技有限公司 | Multiband single-frequency laser output system |
| CN115390336A (en) * | 2022-09-14 | 2022-11-25 | 中国电子科技集团公司第四十一研究所 | Optical difference frequency terahertz wave generation device and method based on lithium niobate crystal |
| CN115390336B (en) * | 2022-09-14 | 2024-05-24 | 中国电子科技集团公司第四十一研究所 | Optical difference frequency terahertz wave generation device and method based on lithium niobate crystal |
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