CN109119871A - A kind of annular chamber terahertz-wave parametric oscillator - Google Patents
A kind of annular chamber terahertz-wave parametric oscillator Download PDFInfo
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- CN109119871A CN109119871A CN201811184841.7A CN201811184841A CN109119871A CN 109119871 A CN109119871 A CN 109119871A CN 201811184841 A CN201811184841 A CN 201811184841A CN 109119871 A CN109119871 A CN 109119871A
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- reflecting mirror
- stokes light
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- thz wave
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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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- 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
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Abstract
The invention discloses a kind of annular chamber terahertz-wave parametric oscillators, and including pumping source, GaP crystal and the reflecting mirror being arranged in around GaP crystal, pumping source is by KD*P crystal, polarizing film, Nd:YAG laser pumping module, the first reflecting mirror and the second reflecting mirror composition；The pump light incidence GaP crystal vibrated back and forth, four beam Stokes light and four beam THz waves are generated through optical parameter effect, four beam Stokes light are respectively the first Stokes light, the 2nd Stokes light, the 3rd Stokes light and the 4th Stokes light, and four beam THz waves are respectively the first THz wave, the second THz wave, third THz wave and the 4th THz wave.During optical parameter, intracavitary Stokes light and pump light can be recycled, and effectively improve pumping light utilization ratio.
Description
Technical field
The invention belongs to THz wave technology application fields, and in particular to a kind of annular chamber terahertz-wave parametric oscillator.
Background technique
Terahertz (THz) wave refers to that frequency is in 0.1-10THz(1THz=1012Hz) the electromagnetic wave in range is located at milli
Between metric wave and infrared waves.THz wave is different from millimeter wave and infrared waves, has many peculiar properties:
(1) a large amount of organic molecules, the subband of semiconductor and micro-strip, rotation and vibrational transition energy be all in THz range, THz wave
Spectrally resolved characteristic makes THz Detection Techniques, especially THz spectral imaging technology, other than it can distinguish the pattern of substance, moreover it is possible to
Identify the constituent of substance.
(2) from the point of view of it is through the spectrum of different materials and imaging, THz radiation can penetrate nonmetallic and non-polar 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, has compared with X-ray
Low energy will not cause the light ionization of biological tissue, so as to be applied to human body safety inspection or biomedical imaging etc..
(4) THz radiation has good space, temporal coherence.
(5) THz wavestrip is wide very wide, can work except the wave band that current stealth technology can be fought, so it can be used
Stealthy Target is detected, can obtain the image of stealth aircraft as the ULTRA-WIDEBAND RADAR of radiation source using it.
At present limitation THz wave application critical issue be a lack of high power, high efficiency, it is relevant, tunable, minimize,
The terahertz emission source of room temperature operating.
Summary of the invention
The object of the present invention is to provide a kind of annular chamber terahertz-wave parametric oscillators, to solve existing terahertz emission
The problems such as source power is low, low efficiency.
The object of the present invention is achieved in the following manner:
A kind of annular chamber terahertz-wave parametric oscillator, including pumping source, GaP crystal and the reflection being arranged in around GaP crystal
Mirror, pumping source is by KD*P crystal, polarizing film, Nd:YAG laser pumping module, the first reflecting mirror and the second reflecting mirror composition；
The pump light incidence GaP crystal vibrated back and forth generates four beam Stokes light and four beam THz waves through optical parameter effect,
Four beam Stokes light are respectively the first Stokes light, the 2nd Stokes light, the 3rd Stokes light and the 4th Stokes light, and four beams are too
Hertz wave is respectively the first THz wave, the second THz wave, third THz wave and the 4th THz wave；
It is a branch of Stokes light that first Stokes light is photosynthetic with the 2nd Stokes after third reflecting mirror and the reflection of the 6th reflecting mirror,
It is overlapped after the 4th reflecting mirror and the reflection of the 5th reflecting mirror with the first Stokes light again, a closed annular chamber is formed, at this
In annular chamber, the first Stokes light and the 2nd Stokes light are exaggerated the second THz wave and third terahertz through optical parameter effect
Hereby wave；
It is a branch of Stokes light that 4th Stokes light is photosynthetic with the 3rd Stokes after the 6th reflecting mirror and the reflection of third reflecting mirror,
It is overlapped after the 5th reflecting mirror and the reflection of the 4th reflecting mirror with the 4th Stokes light again, a closed annular chamber is formed, at this
In annular chamber, the 3rd Stokes light and the 4th Stokes light are exaggerated the first THz wave and the 4th terahertz through optical parameter effect
Hereby wave；
First THz wave, the second THz wave, third THz wave and the 4th THz wave go out perpendicular to the surface of GaP crystal
It penetrates.
First reflecting mirror, the second reflecting mirror, third reflecting mirror, the 4th reflecting mirror, the 5th reflecting mirror and the 6th reflection
Mirror is plane mirror.
First reflecting mirror reflects pump light part pumping light total reflection, the second reflecting mirror, third reflecting mirror, the
Four reflecting mirrors, the 5th reflecting mirror and the 6th reflecting mirror are to pump light and four beam Stokes light total reflections.
The third reflecting mirror, the 4th reflecting mirror, the 5th reflecting mirror and the 6th reflecting mirror adjustable angle.
The GaP crystal is hexagon in X-Y plane, and the plane of beam propagation is plane determined by X-axis and Y-axis, Z
For axis perpendicular to the plane of beam propagation, X-axis is parallel with the direction for the pump light that pumping source is emitted.
The first Stokes light, the 2nd Stokes light, the 3rd Stokes light and the 4th Stokes light wavelength be equal,
First THz wave, the second THz wave, third THz wave and the 4th THz wave frequency be equal.
Compared with the existing technology, the present invention has compared with the existing terahertz emission source based on optical parameter effect
Following advantages:
(1) the four beam Stokes light generated vibrate back and forth in ring resonator, can effectively be amplified by optical parameter effect
THz wave.
(2) four beam THz waves can produce by a branch of pump light, optical conversion efficiencies effectively increase.
(3) during optical parameter, intracavitary Stokes light and pump light can be recycled, and effectively improve pump light
Utilization efficiency.
(4) four beam THz waves are emitted perpendicular to GaP crystal, are not needed any output coupler, are effectively reduced terahertz
Hereby wave output loss.
Detailed description of the invention
Fig. 1 is the structure principle chart of the embodiment of the present invention.
Fig. 2 is pump light in GaP crystal, Stokes light and THz wave phase matched schematic diagram.K in figurep、Ks、KTRespectively
For the wave vector of pump light, Stokes light, THz wave, the angle θ is pump light wave vector KpK is sweared with Stokes light wavesBetween angle.
Fig. 3 is GaP crystalline size figure in embodiment.
Specific embodiment
The present invention will be further described in detail with reference to the accompanying drawing.
As shown in Figure 1, a kind of annular chamber terahertz-wave parametric oscillator, including pumping source, GaP crystal 7 and setting are in GaP
Reflecting mirror around crystal 7, pumping source is by KD*P crystal 1, polarizing film 2, Nd:YAG laser pumping module 3, the first reflecting mirror 5
It is formed with the second reflecting mirror 6；The pump light 4 that pumping source issues is in the resonant cavity being made of the first reflecting mirror 5 and the second reflecting mirror 6
Interior resonance amplification.The pumping source that the present embodiment uses is Nd:YAG pulse laser, wavelength 1064nm, and pulse width is
10ns, repetition rate 10Hz, beam diameter 5mm, power density 20MW/cm2。
The 4 incidence GaP crystal 7 of pump light vibrated back and forth generates four beam Stokes light and four beams too through optical parameter effect
Hertz wave, four beam Stokes light are respectively the first Stokes light 8, the 2nd Stokes light 9, the 3rd Stokes light 10 and the 4th
Stokes light 11, four beam THz waves are respectively the first THz wave 16, the second THz wave 17, third THz wave 18 and
Four THz waves 19；The direction of propagation of four beam Stokes light and four beam THz waves is as shown in Figure 1, four beam Stokes light and four beams
The phase matched situation of THz wave is as shown in Figure 2.
First Stokes light 8 is combined into one with the 2nd Stokes light 9 after third reflecting mirror 12 and the reflection of the 6th reflecting mirror 15
Beam Stokes light, then be overlapped after the 4th reflecting mirror 13 and the reflection of the 5th reflecting mirror 14 with the first Stokes light 8, it forms one and closes
Annular chamber is closed, in this annular chamber, the first Stokes light 8 and the 2nd Stokes light 9 are exaggerated second through optical parameter effect
THz wave 17 and third THz wave 18；
4th Stokes light 11 is combined into after the 6th reflecting mirror 15 and third reflecting mirror 12 reflect with the 3rd Stokes light 10 a branch of
Stokes light, then be overlapped after the 5th reflecting mirror 14 and the reflection of the 4th reflecting mirror 13 with the 4th Stokes light 11, it forms one and closes
Annular chamber is closed, in this annular chamber, the 3rd Stokes light 10 and the 4th Stokes light 11 are exaggerated the through optical parameter effect
One THz wave 16 and the 4th THz wave 19；
First THz wave 16, the second THz wave 17, third THz wave 18 and the 4th THz wave 19 are perpendicular to GaP crystal
7 surface outgoing；
The plane of beam propagation is plane determined by X-axis and Y-axis, plane of the Z axis perpendicular to beam propagation, X-axis and pumping source
The direction of the pump light of outgoing is parallel, and the direction of the pump light of the first reflecting mirror 5 of direction of pumping source outgoing is X-axis negative sense,
And the direction of the 4th THz wave 19 being emitted from the surface of GaP crystal 7 and the angle of Y-axis forward direction are acute angle.
First reflecting mirror 5, the second reflecting mirror 6, third reflecting mirror 12, the 4th reflecting mirror 13, the 5th reflecting mirror 14 and the 6th
Reflecting mirror 15 is plane mirror.
First reflecting mirror 5 is totally reflected pump light 4, and the second reflecting mirror 6 reflects 4 part of pump light, third reflecting mirror 12,
4th reflecting mirror 13, the 5th reflecting mirror 14 and the 6th reflecting mirror 15 are to pump light 4 and four beam Stokes light total reflections.
First reflecting mirror 5 is totally reflected 1064nm pump light 4, and the second reflecting mirror 6 is to the reflectivity of 1064nm pump light 4
95%, third reflecting mirror 12, the 4th reflecting mirror 13, the 5th reflecting mirror 14 and the 6th reflecting mirror 15 constitute Stokes light annular resonance
Chamber, third reflecting mirror 12, the 4th reflecting mirror 13, the 5th reflecting mirror 14 and the 6th reflecting mirror 15 are to wave-length coverage in 1064-
The light 100% of 1100nm reflects.
Third reflecting mirror 12, the 4th reflecting mirror 13, the 5th reflecting mirror 14 and the 6th reflecting mirror 15 adjustable angle, by changing
Become the angle of third reflecting mirror 12, the 4th reflecting mirror 13, the 5th reflecting mirror 14 and the 6th reflecting mirror 15, thus it is possible to vary first
Angle theta between Stokes light 8, the 2nd Stokes light 9, the 3rd Stokes light 10, the 4th Stokes light 11 and pump light 4.This
The angle θ is 0.4 ° in embodiment.
GaP crystal 7 is hexagon in X-Y plane.
The side length on two sides perpendicular to X-direction of hexagon is 2cm, and the side length of other four edges is 5cm, six sides
Two acute interior angles of shape are 33.44 °, GaP crystal 7 in Z-direction with a thickness of 1cm, as shown in Figure 3.Crystal ruler in Fig. 3
It is very little that pump light 4 can be guaranteed in the positive and negative both direction vertical incidence GaP crystal 7 of X-axis, the first THz wave 16, the second Terahertz
Wave 17, third THz wave 18 and the 4th THz wave 19 are emitted perpendicular to the surface of GaP crystal 7.
In the present embodiment, the first Stokes light 8, the 2nd Stokes light 9, the 3rd Stokes light 10, the 4th Stokes light 11
Wavelength be equal, be equal to 1087.1nm, the first THz wave 16, the second THz wave 17, third THz wave 18 and
The frequency of four THz waves 19 is equal, and is equal to 6THz.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.Base of the 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 (6)
1. a kind of annular chamber terahertz-wave parametric oscillator, it is characterised in that: exist including pumping source, GaP crystal (7) and setting
Reflecting mirror around GaP crystal (7), pumping source is by KD*P crystal (1), polarizing film (2), Nd:YAG laser pumping module (3),
First reflecting mirror (5) and the second reflecting mirror (6) composition；
Pump light (4) the incidence GaP crystal (7) vibrated back and forth generates four beam Stokes light and four beams too through optical parameter effect
Hertz wave, four beam Stokes light are respectively the first Stokes light (8), the 2nd Stokes light (9), the 3rd Stokes light (10) and
Four Stokes light (11), four beam THz waves are respectively the first THz wave (16), the second THz wave (17), third Terahertz
Wave (18) and the 4th THz wave (19)；
First Stokes light (8) closes after third reflecting mirror (12) and the reflection of the 6th reflecting mirror (15) with the 2nd Stokes light (9)
For a branch of Stokes light, then it is overlapped with the first Stokes light (8) after the 4th reflecting mirror (13) and the reflection of the 5th reflecting mirror (14),
A closed annular chamber is formed, in this annular chamber, the first Stokes light (8) and the 2nd Stokes light (9) are through optical parameter
Effect is exaggerated the second THz wave (17) and third THz wave (18)；
4th Stokes light (11) through the 6th reflecting mirror (15) and third reflecting mirror (12) reflection after with the 3rd Stokes light (10)
It is combined into a branch of Stokes light, then is weighed after the 5th reflecting mirror (14) and the reflection of the 4th reflecting mirror (13) with the 4th Stokes light (11)
It closes, forms a closed annular chamber, in this annular chamber, the 3rd Stokes light (10) and the 4th Stokes light (11) are through optics
Parametric effect is exaggerated the first THz wave (16) and the 4th THz wave (19)；
First THz wave (16), the second THz wave (17), third THz wave (18) and the 4th THz wave (19) are vertical
It is emitted in the surface of GaP crystal (7).
2. annular chamber terahertz-wave parametric oscillator according to claim 1, it is characterised in that: first reflecting mirror
(5), the second reflecting mirror (6), third reflecting mirror (12), the 4th reflecting mirror (13), the 5th reflecting mirror (14) and the 6th reflecting mirror
It (15) is plane mirror.
3. annular chamber terahertz-wave parametric oscillator according to claim 1, it is characterised in that: first reflecting mirror
(5) pump light (4) are totally reflected, the second reflecting mirror (6) reflects pump light (4) part, third reflecting mirror (12), the 4th reflection
Mirror (13), the 5th reflecting mirror (14) and the 6th reflecting mirror (15) are to pump light (4) and four beam Stokes light total reflections.
4. annular chamber terahertz-wave parametric oscillator according to claim 1, it is characterised in that: the third reflecting mirror
(12), the adjustable angle of the 4th reflecting mirror (13), the 5th reflecting mirror (14) and the 6th reflecting mirror (15).
5. annular chamber terahertz-wave parametric oscillator according to claim 1, it is characterised in that: the GaP crystal (7) exists
It is hexagon in X-Y plane, the plane of beam propagation is plane determined by X-axis and Y-axis, and Z axis is perpendicular to the flat of beam propagation
Face, X-axis are parallel with the direction for the pump light that pumping source is emitted.
6. annular chamber terahertz-wave parametric oscillator according to claim 1, it is characterised in that: the first Stokes light
(8), the wavelength of the 2nd Stokes light (9), the 3rd Stokes light (10) and the 4th Stokes light (11) is equal, the first Terahertz
Wave (16), the second THz wave (17), third THz wave (18) and the 4th THz wave (19) frequency be equal.
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| CN201811184841.7A CN109119871B (en) | 2018-10-11 | 2018-10-11 | Annular cavity terahertz wave parametric oscillator |
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| CN201811184841.7A CN109119871B (en) | 2018-10-11 | 2018-10-11 | Annular cavity terahertz wave parametric oscillator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110034482A (en) * | 2019-05-09 | 2019-07-19 | 华北水利水电大学 | A kind of multiple beam terahertz-wave parametric oscillator |
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| CN110034482B (en) * | 2019-05-09 | 2020-08-04 | 华北水利水电大学 | Multi-beam terahertz wave parametric oscillator |
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