CN104503183B - Self frequency-changing's tera-hertz parametric oscillator - Google Patents
Self frequency-changing's tera-hertz parametric oscillator Download PDFInfo
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- CN104503183B CN104503183B CN201410757225.1A CN201410757225A CN104503183B CN 104503183 B CN104503183 B CN 104503183B CN 201410757225 A CN201410757225 A CN 201410757225A CN 104503183 B CN104503183 B CN 104503183B
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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
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Abstract
The present invention relates to solid state laser and and correlation technique, it is complicated to solve tera-hertz parametric oscillator, system is difficult to the problem of miniaturization, the present invention adopts the technical scheme that, self frequency-changing's tera-hertz parametric oscillator, including pumping source (1), self frequency-changing's crystal (2), resonator (3), THz wave outgoing mirror (4)；Pump light that pumping source (1) is sent injection self frequency-changing's crystal (2), the activation particle absorption pump light in self frequency-changing's crystal (2) produce population inversion, laser generation are produced under the feedback of resonator (3)；Simultaneously, self frequency-changing's crystal (2) has nonlinear effect, frequency transformation is carried out to oscillating laser, laser is transformed into by terahertz wave band by parametric oscillation under same resonator (3) effect, the caused THz wave direction of propagation is identical with laser generation, is collected and is reflected outside output cavity by THz wave outgoing mirror (4).Present invention is mainly applied to solid state laser and nonlinear optical frequency conversion occasion.
Description
Technical field
The present invention relates to solid state laser and nonlinear optical frequency conversion, and in particular to one kind was both produced using one piece of crystal
Raw laser produces the device of terahertz emission by frequency transformation simultaneously again.
Technical background
Terahertz (Terahertz or THz) radiation is frequency in 0.1-10THz, and representative center frequency is 1THz electromagnetism
Ripple, its wave band are important electromagnetic wave band of the macroelectronics to microcosmic photonic propulsion transition between microwave and infrared ray.Terahertz
Hereby ripple is in the basic research such as physics, chemistry, astronomy, molecular spectrum, life science and medical science field, and medical science into
Picture, safety inspection, environmental monitoring, material analysis, food inspection, radio astronomy, mobile communication, satellite communication and military radar etc.
Applied research fields have great scientific research value and wide application prospect.
Tera-hertz parametric oscillator (TPO) is a kind of important terahertz emission source, has tunable, line width, room temperature
The advantages that operating, extensive both at home and abroad pay attention to has been obtained in recent years.At present, tera-hertz parametric oscillator generally utilizes big energy
Pulse Nd:YAG laser using lithium niobate (LiNbO3) or mixes magnesia lithium niobate (MgO as pumping source:LiNbO3) conduct
Nonlinear crystal produces parametric oscillation in resonator by non-colinear phase matched, and passes through silicon prism-coupled or vertical crystal
Surface exports THz wave, and adjusting incident angle of light or resonator can realize that the tuning of THz wave (refers to Jun-ichi
Shikat etc. is published in IEEE Transactions on Microwave Theory and Techniques text for 2000
Chapter Tunable terahertz-wave parametric oscillators using LiNbO3and MgO:
LiNbO3crystals).Further to reduce the threshold value of tera-hertz parametric oscillator and reducing the volume of device, someone utilizes
PPLN is placed on laser resonance intracavitary as nonlinear crystal, laser and parametric oscillator common resonant chamber, that is, uses
Inner chamber pump mode, the THz wave output for realizing high repetition frequency (are published in for 2006 with reference to T.J.Edwards etc.
Optics Express article Compact source of continuously and widely-tunable
terahertz radiation).Domestic more units have also been made in terms of the tera-hertz parametric oscillator of pulse laser pumping
Substantial amounts of theoretical and experimental study work (is published in the article of " laser and optoelectronics progress " for 2012 " too with reference to Liu Lei etc.
Hertz wave parametric oscillator progress ").
At least have the following disadvantages in the prior art and insufficient：Due to the pumping needed for existing tera-hertz parametric oscillator
Laser and parametric oscillator are two systems in itself, miniaturization can not be fundamentally realized, even for more compact
Inner chamber pumping tera-hertz parametric oscillator, because the crystal for producing laser and the crystal for realizing frequency transformation are not one piece of crystal,
Resonator also and non-common, can not be effectively compressed the volume of whole device to a certain extent；Existing traditional Terahertz parameter
Oscillator phase matching way uses non-colinear phase matched mostly, and THz wave is needed using the output of silicon prism-coupled or needs
The plane of crystal export structure of complex designing；The tuning of tera-hertz parametric oscillator needs to change pumping direction or whole parameter shakes
The angle of device resonator is swung, the adjustment of mechanical structure is unfavorable for the stability of integral device.
So far, at home and abroad there is no any report and collection is produced into laser and nonlinear optical frequency conversion function is one
The self frequency-changing Nd of body:PPLN crystal is used for the generation of THz ripples.Using self frequency-changing's crystal and Terahertz parametric oscillation skill in the present invention
Art combines, and will greatly reduce the size of tera-hertz parametric oscillator, and its is simple in construction, and design is easy, and tuning manner is not
Change mechanical structure, stability is good, has important application valency in portable and integrated Terahertz detection or imaging system
Value.
The content of the invention
For overcome the deficiencies in the prior art, solution tera-hertz parametric oscillator is complicated, and system is difficult to what is minimized
Problem.Therefore, the present invention adopts the technical scheme that, self frequency-changing's tera-hertz parametric oscillator, including：Pumping source (1), self frequency-changing
Crystal (2), resonator (3), THz wave outgoing mirror (4)；Pump light injection self frequency-changing's crystal (2) that pumping source (1) is sent, from
Activation particle absorption pump light in frequency-changer crystal (2) produces population inversion, and laser is produced under the feedback of resonator (3) and is shaken
Swing；Meanwhile self frequency-changing's crystal (2) has nonlinear effect, frequency transformation is carried out to oscillating laser, made in same resonator (3)
Laser is transformed into by terahertz wave band by parametric oscillation with lower, the caused THz wave direction of propagation is identical with laser generation,
Collected and reflected outside output cavity by THz wave outgoing mirror (4).
The pumping source (1) is specially：Direct output semiconductor laser or fiber coupling output with condenser lens
Semiconductor laser, 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, self frequency-changing's crystal
(2) it is specially Nd:PPLN crystal, Nd3+ doping concentrations are 0.1%-3%, and the polarization cycle of crystal is 20~120 μm, thang-kng side
It is 10~50mm to length, both ends of the surface are coated with 800~820nm and 1050~1100nm anti-reflection films.
The resonator (3) is made up of two hysteroscopes, and two hysteroscope inner cavity surfaces are coated with 1084nm high-reflecting films, close to pumping
The hysteroscope two sides in source (1) also needs to be coated with 809~813nm anti-reflection films；Two optic formations of the resonator (3) can be plane
Mirror, plano-concave mirror or biconcave mirror, host material can be K9 glass, quartz, sapphire, YAG, CaF2 etc..
Insertion polarizer in the resonator (3), operates laser linear polarization.
Actively or passively Q-switching device is inserted inside the resonator (3), laser is operated with impulse form and produces pulse
THz wave.
The THz wave outgoing mirror (4) is off axis paraboloidal mirror, central shaft is consistent with light path and with diameter 1~
3mm light holes, reflecting surface are coated with aluminium or golden reflectance coating, and off-axis angle is 45 degree, the THz wave vertical optical path output cavity of reflection
Outside.
Meet collinear phase matching condition in self frequency-changing's crystal (2) of tera-hertz parametric oscillator, and export THz wave
Length is adjustable, by controlling the wavelength of temperature, angle or polarization cycle change output THz wave of self-frequency-doubling crystal achievable
Tuning range is 0.1~3THz.
Compared with the prior art, technical characterstic of the invention and effect：
Self frequency-changing's tera-hertz parametric oscillator of the present invention is by one piece of self frequency-changing's crystal and shared resonator by laser
Produce and be combined together with the frequency conversion process of parametric oscillation, solve the pump laser of existing tera-hertz parametric oscillator
It is discrete part with parametric oscillator, system complex and the problem of can not minimize.Self frequency-changing's Terahertz parametric oscillation of the present invention
Device, only with one piece of crystal, integrate and produce laser and frequency transformation, greatly reduce plant bulk, and the letter of its structure
Single, design is convenient, can adjust output wavelength without changing mechanical structure by changing crystal operating temperature, and stability is good, can be with
Realize collinear phase matching, and can continuous wave or impulse form operating, portable and integrated Terahertz detection or into
As there is significant application value in system.
Brief description of the drawings
A kind of structural representations of self frequency-changing's tera-hertz parametric oscillator output of Fig. 1.
A kind of self frequency-changing's tera-hertz parametric oscillator output pulse with polarizer and acousto-optic Q-switching in Fig. 2 resonators
THz wave embodiment.
Embodiment
The technical solution adopted in the present invention is：A kind of compact self frequency-changing tera-hertz parametric oscillator, including pumping source
(1), self frequency-changing's crystal (2), resonator (3), THz wave outgoing mirror (4).The pump light injection self frequency-changing that pumping source (1) is sent
Crystal (2), the activation particle absorption pump light in self frequency-changing's crystal (2) produces population inversion, under the feedback of resonator (3)
Produce laser generation.Meanwhile self frequency-changing's crystal (2) has nonlinear effect, frequency transformation is carried out to oscillating laser, same humorous
The chamber (3) that shakes effect is lower to be transformed into terahertz wave band, the caused THz wave direction of propagation and laser by parametric oscillation by laser
Oscillating phase is same, is collected and is reflected outside output cavity by THz wave outgoing mirror (4).
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is described in further detail.
As shown in Fig. 2 the pumping source (1) is the semiconductor laser that fiber coupling exported and carried condenser lens, it is defeated
The centre wavelength for going out laser is 809nm or 813nm, and the core diameter of energy-transmission optic fibre is 400 μm, numerical aperture 0.22, pump
The hot spot that the laser that optical fiber transmits is converted into 320 μm of diameter by Pu source (1) incidental condenser lens incides self frequency-changing's crystal
(2) in, focus point is located in self frequency-changing's crystal (2) surface at 1mm.Self frequency-changing's crystal (2) is Nd:PPLN crystal, Nd3+Mix
Miscellaneous concentration is 0.2%, and polarization cycle is 71 μm, and polarised direction is along crystal z-axis, and crystalline size is 1mm × 5mm × 20mm, both ends
Face is coated with 813nm and 1050~1100nm anti-reflection films.The resonator (3) is made up of two hysteroscopes, and two hysteroscopes are plano-concave mirror,
Concave curvature radius is 100mm, and lens substrate is K9 glass materials, and two eyeglass concave surfaces are coated with 1084nm high-reflecting films, pumping source
The hysteroscope two sides of side is also coated with 809~813nm anti-reflection films, a length of 120mm of resonator simultaneously.Insertion polarizer in resonator
(6), concrete form is Brewster piece, can operate the laser linear polarization of intracavitary, and Brewster piece is K9 glass materials, diameter
20mm, placed with optical axis into 56.6 °, the plane of incidence and Nd:The z-axis of PPLN crystal is consistent with the plane that optical direction is formed, delustring
Than more than 95%.Intracavitary also inserts acousto-optic Q-switching (5), and acousto-optic medium is fused quartz, medium length 30mm, ultrasonic wave work
Frequency is 27.14MHz, driving power 20W, effective work aperture 1.8mm, q-frequency 20kHz.Self frequency-changing's crystal
(2)Nd:PPLN absorptive pumping light, the energy state of particle is activated by ground state transition to excitation state, pump energy is stored in laser
In upper energy level, when acousto-optic Q-switching is closed, upper energy level population constantly accumulates and produces a large amount of inverted populations,
When acousto-optic Q is opened, meet laser oscillation condition, realize that violent stimulated radiation is amplified rapidly by the feedback of resonator,
Linear polarization giant-pulse laser generation, polarization direction and Nd are established in resonator:The polarised direction of PPLN crystal is consistent.The ripple of laser
A length of 1084nm, pulse recurrence frequency consistent with q-frequency is 20kHz.Meanwhile in self frequency-changing's crystal (2) Nd:PPLN's is non-thread
Property effect under, 1084nm laser produces parametric oscillation effect in the presence of the same resonator (3), by laser frequency conversion
To terahertz wave band, caused THz wave frequency is 1.5THz under normal temperature.Paraboloidal mirror is arranged in resonator optical axis direction, from
Shaft angle degree is 45 °, focal length 100mm, and reflecting surface plates anti-oxidation golden reflectance coating, and there is a diameter of 1.5mm through hole at center to ensure
1084nm laser generations.
Under the conditions of the dimension limit using part, such as the polarization cycle of crystal is 20 or 120 μm, optical direction length
For 10 or 50mm, both ends of the surface, which are coated with 800 or 820nm and 1050 or the 1100nm anti-reflection films present invention, can also obtain good result.
In summary, the embodiments of the invention provide a kind of self frequency-changing's tera-hertz parametric oscillator light device, self frequency-changing is passed through
Nd:PPLN crystal and shared resonator are by the generation of pumping laser and from pumping laser to the parametric oscillation frequency of THz wave
Conversion process is combined together, and greatly reduces the size of traditional tera-hertz parametric oscillator, and its is simple in construction, design side
Just, output wavelength can be adjusted without changing mechanical structure by changing crystal operating temperature, stability is good, it is possible to achieve conllinear phase
Position matching, and being capable of continuous wave or impulse form operating
The specific embodiment of the present invention is the foregoing is only, is not intended to limit the invention, all spirit in the present invention
Within principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.
Claims (8)
1. a kind of self frequency-changing's tera-hertz parametric oscillator, it is characterized in that, including：Pumping source (1), self frequency-changing's crystal (2), resonator
(3), THz wave outgoing mirror (4)；Pump light injection self frequency-changing's crystal (2) that pumping source (1) is sent, self frequency-changing's crystal (2) are interior
Activation particle absorption pump light produce population inversion, produce laser generation under the feedback of resonator (3)；Meanwhile become certainly
Frequency crystal (2) has nonlinear effect, and frequency transformation is carried out to oscillating laser, passes through parameter under same resonator (3) effect
Laser is transformed into terahertz wave band by vibration, and the caused THz wave direction of propagation is identical with laser generation, defeated by THz wave
Appearance (4) is collected and 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, pumping source (1) tool
Body is：Direct output semiconductor laser or fiber coupling output semiconductor laser with condenser lens, semiconductor laser
The output wavelength of device is 809nm or 813nm.
3. self frequency-changing's tera-hertz parametric oscillator as claimed in claim 1, it is characterized in that, self frequency-changing's crystal (2) is specific
For Nd:PPLN crystal, Nd3+Doping concentration is 0.1%-3%, and the polarization cycle of crystal is 20~120 μm, and optical direction length is
10~50mm, both ends of the surface are coated with 800~820nm and 1050~1100nm anti-reflection films.
4. self frequency-changing's tera-hertz parametric oscillator as claimed in claim 1, it is characterized in that, the resonator (3) is by two chambers
Mirror is formed, and two hysteroscope inner cavity surfaces are coated with 1084nm high-reflecting films, also need to be coated with 809 close to the hysteroscope two sides of pumping source (1)~
813nm anti-reflection films；Two optic formations of the resonator (3) are level crossing, plano-concave mirror or biconcave mirror, and host material is K9 glass
Glass, quartz, sapphire, YAG or CaF2。
5. self frequency-changing's tera-hertz parametric oscillator as claimed in claim 1, it is characterized in that, insertion is inclined in the resonator (3)
Shake device, operates laser linear polarization.
6. self frequency-changing's tera-hertz parametric oscillator as claimed in claim 1, it is characterized in that, inserted inside the resonator (3)
Actively or passively Q-switching device, laser is operated 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 characterised in that the THz wave is defeated
Appearance (4) is off axis paraboloidal mirror, and central shaft is consistent with light path and has diameter 1~3mm light holes, reflecting surface be coated with aluminium or
Golden reflectance coating, off-axis angle are 45 degree, outside the THz wave vertical optical path output cavity of reflection.
A kind of 8. self frequency-changing's tera-hertz parametric oscillator according to claim 1, it is characterised in that Terahertz parametric oscillation
Meet collinear phase matching condition in self frequency-changing's crystal (2) of device, and export Terahertz Wavelength tunable, it is brilliant from frequency multiplication by control
The achievable tuning range of wavelength that temperature, angle or the polarization cycle of body change output THz wave is 0.1~3THz.
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Families Citing this family (6)
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| CN105048274B (en) * | 2015-08-24 | 2018-07-06 | 山东大学 | A kind of passive Q-adjusted pulsed is from frequency doubling green light laser |
| JP2017138461A (en) * | 2016-02-03 | 2017-08-10 | 澁谷工業株式会社 | Terahertz light generator |
| CN106898937B (en) * | 2017-02-16 | 2019-07-23 | 中国科学院电子学研究所 | Semiconductor laser side face couples the alkali metal laser axially pumped |
| 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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