CN106451032B - A kind of inner cavity tera wave parametric oscillator of THz wave enhancing - Google Patents
A kind of inner cavity tera wave parametric oscillator of THz wave enhancing Download PDFInfo
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- CN106451032B CN106451032B CN201610883231.0A CN201610883231A CN106451032B CN 106451032 B CN106451032 B CN 106451032B CN 201610883231 A CN201610883231 A CN 201610883231A CN 106451032 B CN106451032 B CN 106451032B
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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 discloses a kind of inner cavity tera wave parametric oscillators of THz wave enhancing, including pumping source, the first MgO:LiNbO3Crystal, the 2nd MgO:LiNbO3Crystal, the 3rd MgO:LiNbO3Crystal, third speculum, the 4th speculum and the 5th speculum.The two beam THz waves that the present invention is generated through optical parameter effect then can effectively amplify another beam THz wave wherein a branch of THz wave can enhance optical parameter effect as seed light.During optical parameter, the Stokes light and pump light of intracavitary can recycle, and effectively improve pumping light utilization ratio.THz wave is perpendicular to MgO:LiNbO3Crystal is emitted, and is not needed any output coupler, is effectively reduced THz wave output loss.By changing the angle between pump light and Stokes light, the THz wave of frequency tuning can be obtained, tuning manner is simple, and operation is flexible.
Description
Technical field
The invention belongs to THz wave technology fields, and in particular to a kind of inner cavity tera wave parameter of THz wave enhancing
Oscillator.
Background technology
THz wave（THz）, refer to that frequency is in 0.1-10THz（1THz=1012Hz）Electromagnetic wave in range is located at micro-
It between wave and infra-red radiation, is overlapped with millimeter wave in long wave strong point, is overlapped with infrared waves in shortwave strong point, be electronics and photon
Learn, transitional region from macroscopic theory to microscopic theory.THz wave between microwave band and infrared band has many
Special property：
（1）A large amount of organic molecules, the subband of semiconductor and micro-strip, rotation and vibrational transition energy are all in THz wave model
It encloses, the spectrally resolved characteristic of THz wave makes THz wave Detection Techniques, especially THz wave spectral imaging technology, in addition to
It can distinguish outside the pattern of substance, moreover it is possible to differentiate the constituent of substance.
（2）From the point of view of it is through the spectrum of different materials and imaging, terahertz radiation can penetrate nonmetallic and nonpolar
Material, such as textile, cardboard, plastics, timber packing material.
（3）Another distinguishing feature of THz wave is its safety, and energy only has milli electron-volt, compared with X-ray
With low energy, the light ionization of biological tissue will not be caused, so as to be applied to human body safety inspection or biomedical imaging etc.
Aspect.
（4）Terahertz radiation has good space, temporal coherence.
（5）THz wave bandwidth is very wide, can work except the wave band that current stealth technology can be fought, so available
It detects Stealthy Target, can obtain the image of stealth aircraft as the ULTRA-WIDEBAND RADAR of radiation source using it.
To lack can generate high power, high quality, efficient THz wave, and low cost and can operate at room temperature
THz source is the main problem faced at present.The production method of THz wave mainly has electronics method and photonic propulsion side at present
Method.Electronics method is that the wavelength generally by electromagnetic radiation extends to terahertz wave band from millimeter wave, is also equivalent to a frequency
The process that rate becomes larger, but prodigious obstacle can be encountered when frequency is more than 1THz, so that efficiency becomes very low, while electronics
The terahertz radiation source that method generates is bulky, limits its application in many fields.And photonic propulsion method its
Main way is exactly that visible light or infrared light are converted to terahertz wave band.The advantage of the method is the THz wave generated
Radiation source has very high coherence and directionality, but the THz wave power and efficiency that generate at this stage are all relatively low.
Invention content
The object of the present invention is to provide a kind of inner cavity tera wave parametric oscillators of THz wave enhancing, existing to solve
There is the problems such as THz wave power is low, efficiency is low.
The purpose of the present invention is what is realized in the following manner：
A kind of inner cavity tera wave parametric oscillator of THz wave enhancing, including pumping source, the first MgO:LiNbO3It is brilliant
Body（6）, the 2nd MgO:LiNbO3Crystal（7）, the 3rd MgO:LiNbO3Crystal（8）, third speculum（10）, the 4th speculum
（11）With the 5th speculum（14）；
Pumping source is by the first speculum（1）,KD*P crystal（2）, polarizing film（3）,Nd:YAG laser pump module（4）With
Second speculum（9）Composition, the pump light that pumping source is sent out（5）By the first speculum（1）With the second speculum（9）Composition
Resonant cavity interior resonance amplifies；
In the first speculum（1）With the second speculum（9）Between the pump light that vibrates back and forth（5）The first MgO of incidence successively:
LiNbO3Crystal（6）, the 3rd MgO:LiNbO3Crystal（8）With the 2nd MgO:LiNbO3Crystal（7）, generated through optical parameter effect
Stokes light（15）, the first THz wave（12）With the second THz wave（13）, Stokes light（15）By third speculum
（10）With the 4th speculum（11）It is vibrated in the resonant cavity of composition, the first THz wave（12）Perpendicular to the 3rd MgO:LiNbO3It is brilliant
Body（8）It is emitted along Y-axis forward direction, the second THz wave（13）Perpendicular to the 3rd MgO:LiNbO3Crystal（8）It is emitted along Y-axis negative sense；
Second THz wave（13）Through the 5th speculum（14）The 3rd MgO of incidence again after reflection:LiNbO3Crystal（8）, as seed
Light enhances optical parameter effect, effectively amplifies Stokes light（15）With the first THz wave（12）.
The pumping source is Nd:YAG pulse lasers, wavelength 1064nm, repetition rate 15Hz, single pulse energy are
120mJ, polarization direction are Z axis.
First speculum（1）, the second speculum（9）, third speculum（10）, the 4th speculum（11）It is anti-with the 5th
Penetrate mirror（14）It is plane mirror, the first speculum（1）With the second speculum（9）To pump light（5）Total reflection, third speculum
（10）With the 4th speculum（11）To Stokes light（15）Total reflection, the 5th speculum（14）THz wave is totally reflected.
First speculum（1）,KD*P crystal（2）, polarizing film（3）,Nd:YAG laser pump module（4）With second
Speculum（9）Adjustable angle.
First MgO:LiNbO3Crystal（6）, the 2nd MgO:LiNbO3Crystal（7）, the 3rd MgO:LiNbO3Crystal（8）
Optical axis along Z axis, MgO doping concentrations are 5mol%, and three pieces of crystal are close together, symmetrically placed along Y-axis.
First MgO:LiNbO3Crystal（6）With the 2nd MgO:LiNbO3Crystal（7）It is identical, crystal is in X-Y
Plane is right-angled trapezium.
3rd MgO:LiNbO3Crystal（8）It is rectangle in X-Y plane.
A kind of inner cavity tera wave parametric oscillator of THz wave enhancing disclosed by the invention is based on optics with existing
The terahertz emission source of parametric effect is compared, and is had the following advantages：
（1）The two beam THz waves generated through optical parameter effect, wherein a branch of THz wave can increase as seed light
Strong optical parameter effect, then can effectively amplify another beam THz wave.
（2）During optical parameter, the Stokes light and pump light of intracavitary can recycle, and effectively improve pump light
Utilization ratio.
（3）THz wave is perpendicular to MgO:LiNbO3Crystal is emitted, and is not needed any output coupler, is effectively reduced too
Hertz wave output loss.
（4）By changing the angle between pump light and Stokes light, the THz wave of frequency tuning can be obtained, is tuned
Mode is simple, and operation is flexible.
Description of the drawings
Fig. 1 is the structure principle chart of the present invention.
Fig. 2 is MgO:LiNbO3Pump light in crystal, Stokes light and THz wave phases match schematic diagram, k in figurep、ks、kT
The respectively wave vector of pump light, Stokes light, THz waves, the angles θ are that pump light waves swear kpK is sweared with Stokes light wavessBetween angle.
Wherein, 1 is the first speculum；2 be KD*P crystal；3 be polarizing film；4 be Nd:YAG laser pump module；5 are
Pump light；6 be the first MgO:LiNbO3Crystal；7 be the 2nd MgO:LiNbO3Crystal；8 be the 3rd MgO:LiNbO3Crystal；9 be
Two-mirror；10 be third speculum；11 be the 4th speculum；12 be the first THz wave；13 be the second THz wave；14 are
5th speculum；15 be Stokes light.
Specific implementation mode
The present invention will be further described in detail below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of inner cavity tera wave parametric oscillator of THz wave enhancing, including pumping source, first
MgO:LiNbO3Crystal 6, the 2nd MgO:LiNbO3Crystal 7, the 3rd MgO:LiNbO3Crystal 8, third speculum the 10, the 4th reflect
Mirror 11 and the 5th speculum 14；
Pumping source is by the first speculum 1, KD*P crystal 2, polarizing film 3, Nd:YAG laser pump module 4 and second reflects
Mirror 9 forms, and the pump light 5 that pumping source is sent out is put in the resonant cavity interior resonance being made of the first speculum 1 and the second speculum 9
Greatly；
The pump light 5 vibrated back and forth between the first speculum 1 and the second speculum 9 the first MgO of incidence successively:LiNbO3
Crystal 6, the 3rd MgO:LiNbO3Crystal 8 and the 2nd MgO:LiNbO3Crystal 7 generates Stokes light 15, the through optical parameter effect
One THz wave 12 and the second THz wave 13, Stokes light 15 be made of third speculum 10 and the 4th speculum 11 it is humorous
It shakes and vibrates in chamber, the first THz wave 12 is perpendicular to the 3rd MgO:LiNbO3Crystal 8 is emitted along Y-axis forward direction, the second THz wave
13 perpendicular to the 3rd MgO:LiNbO3Crystal 8 is emitted along Y-axis negative sense；Second THz wave 13 through the 5th speculum 14 reflection after again
Secondary incident 3rd MgO:LiNbO3Crystal 8 enhances optical parameter effect as seed light, effectively amplifies Stokes light 15 and first
THz wave 12.
Pumping source is Nd:YAG pulse lasers, wavelength 1064nm, repetition rate 15Hz, single pulse energy are
120mJ, polarization direction are Z axis.
First speculum 1, the second speculum 9, third speculum 10, the 4th speculum 11 and the 5th speculum 14 are flat
Face mirror, the first speculum 1 and the second speculum 9 are totally reflected pump light 5, and third speculum 10 and the 4th speculum 11 are right
Stokes light 15 is totally reflected, and the 5th speculum 14 is totally reflected THz wave.
First speculum 1, KD*P crystal 2, polarizing film 3, Nd:The angle of YAG laser pump module 4 and the second speculum 9
It spends adjustable, you can the direction of propagation for changing pump light 5 obtains frequency association to change the angle of pump light 5 and Stokes light 15
The first THz wave 12 and the second THz wave 13 adjusted.During frequency tuning, the first THz wave 12 and the second terahertz
Hereby the frequency of wave 13 is equal always.
As shown in Fig. 2, changing the angle theta of pump light 5 and Stokes light 15, the first Terahertz of frequency coordination can be obtained
Wave 12 and the second THz wave 13 can obtain frequency range when the range at the angles θ changes between 0.3356 ° -1.4686 °
In the THz wave of 0.8-3.2THz, at the same can obtain wave-length coverage 1067-1076.2nm Stokes light 15.
First MgO:LiNbO3Crystal 6, the 2nd MgO:LiNbO3Crystal 7, the 3rd MgO:LiNbO3The optical axis of crystal 8 is along Z
Axis, MgO doping concentrations are 5mol%, and three pieces of crystal are close together, symmetrically placed along Y-axis.
First MgO:LiNbO3Crystal 6 and the 2nd MgO:LiNbO3Crystal 7 is identical, and crystal is straight in X-Y plane
Angle is trapezoidal, and the acute angle of right-angled trapezium is 64.2 °, and right-angled trapezium is respectively 20mm and 28.7mm along two right angle edge lengths of X-axis,
Right-angled trapezium is 18mm along the right angle edge lengths of Y-axis, and the length of the hypotenuse of right-angled trapezium is 20mm.
3rd MgO:LiNbO3Crystal 8 X-Y plane be rectangle, the size of X-axis and Y direction be respectively 6mm and
2mm。
Specific embodiment is presented above, but the present invention is not limited to described embodiment.The base of the present invention
This thinking is above-mentioned basic scheme, and for those of ordinary skill in the art, various changes are designed in introduction according to the present invention
The model of shape, formula, parameter do not need to spend creative work.It is right without departing from the principles and spirit of the present invention
The change, modification, replacement and modification that embodiment carries out are still fallen in protection scope of the present invention.
Claims (4)
1. a kind of inner cavity tera wave parametric oscillator of THz wave enhancing, it is characterised in that：Including pumping source, the first MgO:
LiNbO3Crystal（6）, the 2nd MgO:LiNbO3Crystal（7）, the 3rd MgO:LiNbO3Crystal（8）, third speculum（10）, the 4th
Speculum（11）With the 5th speculum（14）；
Pumping source is by the first speculum（1）,KD*P crystal（2）, polarizing film（3）,Nd:YAG laser pump module（4）With second
Speculum（9）Composition, the pump light that pumping source is sent out（5）By the first speculum（1）With the second speculum（9）The resonance of composition
Intracavitary resonance amplifies；
In the first speculum（1）With the second speculum（9）Between pump light（5）The first MgO of incidence:LiNbO3Crystal（6）,
Three MgO:LiNbO3Crystal（8）With the 2nd MgO:LiNbO3Crystal（7）, Stokes light is generated through optical parameter effect（15）, first
THz wave（12）With the second THz wave（13）, Stokes light（15）By third speculum（10）With the 4th speculum（11）
It is vibrated in the resonant cavity of composition, the first THz wave（12）Perpendicular to the 3rd MgO:LiNbO3Crystal（8）It is emitted along Y-axis forward direction,
Second THz wave（13）Perpendicular to the 3rd MgO:LiNbO3Crystal（8）It is emitted along Y-axis negative sense；Second THz wave（13）Through
Five speculums（14）The 3rd MgO of incidence again after reflection:LiNbO3Crystal（8）, enhance optical parameter effect as seed light, have
Effect amplification Stokes light（15）With the first THz wave（12）；
First MgO:LiNbO3Crystal（6）, the 2nd MgO:LiNbO3Crystal（7）, the 3rd MgO:LiNbO3Crystal（8）Light
For axis along Z axis, MgO doping concentrations are 5mol%, the first MgO:LiNbO3Crystal（6）, the 3rd MgO:LiNbO3Crystal（8）, second
MgO:LiNbO3Crystal（7）Three pieces of crystal are close together successively, symmetrically placed along Y-axis；
First MgO:LiNbO3Crystal（6）With the 2nd MgO:LiNbO3Crystal（7）It is identical, crystal is in X-Y plane
For right-angled trapezium；
3rd MgO:LiNbO3Crystal（8）It is rectangle in X-Y plane.
2. the inner cavity tera wave parametric oscillator of THz wave enhancing according to claim 1, it is characterised in that：It is described
Pumping source is Nd:YAG pulse lasers, wavelength 1064nm, repetition rate 15Hz, single pulse energy 120mJ, polarization side
To for Z axis.
3. the inner cavity tera wave parametric oscillator of THz wave enhancing according to claim 1, it is characterised in that：It is described
First speculum（1）, the second speculum（9）, third speculum（10）, the 4th speculum（11）With the 5th speculum（14）It is
Plane mirror, the first speculum（1）With the second speculum（9）To pump light（5）Total reflection, third speculum（10）With the 4th reflection
Mirror（11）To Stokes light（15）Total reflection, the 5th speculum（14）THz wave is totally reflected.
4. the inner cavity tera wave parametric oscillator of THz wave enhancing according to claim 1, it is characterised in that：It is described
First speculum（1）,KD*P crystal（2）, polarizing film（3）,Nd:YAG laser pump module（4）With the second speculum（9）'s
Adjustable angle.
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| CN109031853A (en) * | 2018-09-04 | 2018-12-18 | 中国电子科技集团公司第三十四研究所 | A kind of phase sensitive optical parametric amplifier and its operation method |
| CN109904714A (en) * | 2019-04-28 | 2019-06-18 | 天津市智慧物联信息技术研究院 | A kind of device and method generating high repetition frequency THz wave |
| CN110137779B (en) * | 2019-05-09 | 2020-10-27 | 华北水利水电大学 | Double-inner-cavity terahertz wave parametric oscillator |
| CN110783801B (en) * | 2019-10-31 | 2021-07-27 | 郑州轻工业学院 | THz wave parameter source for multi-wavelength pulse delay output |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6697186B2 (en) * | 2000-08-30 | 2004-02-24 | Riken | Method and apparatus for generating tera-hertz wave |
| CN103794293A (en) * | 2014-02-25 | 2014-05-14 | 山东大学 | Terahertz parameter source based on potassium titanyl phosphate crystal and application thereof |
| CN103944041A (en) * | 2014-04-09 | 2014-07-23 | 华北水利水电大学 | Terahertz radiation source based on optical parameter effect and optical difference frequency effect |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6697186B2 (en) * | 2000-08-30 | 2004-02-24 | Riken | Method and apparatus for generating tera-hertz wave |
| CN103794293A (en) * | 2014-02-25 | 2014-05-14 | 山东大学 | Terahertz parameter source based on potassium titanyl phosphate crystal and application thereof |
| CN103944041A (en) * | 2014-04-09 | 2014-07-23 | 华北水利水电大学 | Terahertz radiation source based on optical parameter effect and optical difference frequency effect |
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