CN109301681A - A kind of high efficiency terahertz-wave parametric oscillator - Google Patents
A kind of high efficiency terahertz-wave parametric oscillator Download PDFInfo
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Abstract
A kind of high efficiency terahertz-wave parametric oscillator, including pumping source and periodic reversal GaP crystal, including pumping source, reflecting mirror, periodic reversal GaP crystal.Pump light circulation pumping periodic reversal GaP crystal, generates multi beam Stokes (Stokes) light and multi beam Terahertz (THz) wave through quasi-phase matched optical parameter effect.The multi beam Stokes light of generation is collinearly propagated with pump light, and the multi beam THz wave of generation is emitted perpendicular to periodic reversal GaP plane of crystal.During optical parameter, Stokes light and pump light can be recycled, and effectively improve pump light utilization ratio.The THz wave of generation is emitted perpendicular to periodic reversal GaP plane of crystal, is not needed any output coupler, is effectively reduced THz wave output loss.A branch of pump light can produce multi beam THz wave, effectively improve optical conversion efficiencies.
Description
Technical field
The present invention relates to a kind of high efficiency terahertz-wave parametric oscillators, belong to THz wave technology application field.
Background technique
Terahertz (THz) wave refers to that frequency is in 0.1-10THz, 1THz=1012Electromagnetic wave within the scope of Hz is located at millimeter
Between wave and infrared waves.THz wave spectral detection, imaging, remote sensing, communication, biomedicine, in terms of have it is wide
Application prospect.Up to now, the terahertz emission that still weary high power, high efficiency, relevant, tunable, miniaturization, room temperature operate
Source.GaP crystal has great second order nonlinear coefficient, and GaP crystal is smaller to the absorption coefficient of THz wave, so with
Periodic reversal GaP crystal is gain media, can produce high power THz wave by optical parameter effect.
Summary of the invention
The object of the present invention is to provide a kind of high efficiency terahertz-wave parametric oscillators, to solve existing terahertz emission
The technical problems such as the low, low efficiency of source power.
To achieve the above object, the invention adopts the following technical scheme:
A kind of high efficiency terahertz-wave parametric oscillator, it is characterised in that: including pumping source and periodic reversal GaP crystal, period
Reversion GaP crystal include the period 1 reversion GaP crystal, second round reversion GaP crystal, the period 3 reversion GaP crystal and
Period 4 inverts GaP crystal, inverts in the period 1 and sets gradually the first reflection from the front to the back between GaP crystal and pumping source
The second resonator mirror is arranged in period 1 reversion GaP crystal side in mirror, the second reflecting mirror and the first resonator mirror；
The pump light that pumping source issues is after the first reflecting mirror and the second reflecting mirror, partially by vertically entering after the first resonator mirror
After penetrating period 1 reversion GaP crystal, vertically into second after the reflecting surface of period 1 reversion GaP crystal is totally reflected
Periodic reversal GaP crystal, pump light is after the reflecting surface of second round reversion GaP crystal is totally reflected vertically into third week
Phase inverts GaP crystal, and pump light is after the reflecting surface of period 3 reversion GaP crystal is totally reflected vertically into the period 4
GaP crystal is inverted, pump light is anti-vertically into the period 1 after the reflecting surface of period 4 reversion GaP crystal is totally reflected
Turn GaP crystal, forms first cycle period of pump light；The pump light vertical incidence period 1 inverts GaP crystal, first
The reflecting surface of periodic reversal GaP crystal be totally reflected after vertically into second round invert GaP crystal, pump light is in second week
Phase reversion GaP crystal reflecting surface be totally reflected after vertically into the period 3 reversion GaP crystal, pump light is in the period 3
The reflecting surface of reversion GaP crystal be totally reflected after vertically into period 4 reversion GaP crystal, pump light is anti-in the period 4
Turn GaP crystal reflecting surface be totally reflected after vertically into the period 1 invert GaP crystal, second for forming pump light follow
The ring period；And so on, pump light inverts GaP crystal, second round reversion GaP crystal, period 3 reversion in the period 1
N number of period is recycled between GaP crystal and period 4 reversion GaP crystal, N is positive integer, until pump light is anti-in the period 4
Turn GaP crystal reflecting surface be totally reflected after do not re-shoot period 1 reversion GaP crystal, and incident second resonator mirror,
Circulation terminates, and is totally reflected after the second resonator mirror of pump light vertical incidence, along backtracking；
The plane for pumping light propagation is plane determined by X-axis and Y-axis, plane of the Z axis perpendicular to beam propagation, X-axis and pumping
The direction of the pump light of source outgoing is parallel, and the direction of the pump light of pumping source outgoing is that X-axis is positive；
The pump light of roundtrip propagation passes through quasi-phase matched light in the total reflection point of period 1 reversion GaP crystal along the x axis
It learns parametric effect and generates Stokes light and the first THz wave, the Stokes light of generation and collinearly propagated with pump light, the of generation
One THz wave is emitted perpendicular to the fully reflecting surface of period 1 reversion GaP crystal；The pump light of roundtrip propagation exists along the y axis
The total reflection point that period 1 inverts GaP crystal generates Stokes light and the first terahertz by quasi-phase matched optical parameter effect
Hereby wave；The Stokes light of generation is collinearly propagated with pump light, and the first THz wave of generation is brilliant perpendicular to period 1 reversion GaP
The fully reflecting surface of body is emitted, and in N number of cycle period of pump light, generates N beam first too in period 1 reversion GaP crystal
Hertz wave；
The pump light of roundtrip propagation passes through quasi-phase matched light in the total reflection point of second round reversion GaP crystal along the x axis
It learns parametric effect and generates Stokes light and the second THz wave, the Stokes light of generation and collinearly propagated with pump light, the of generation
Two THz waves are emitted perpendicular to the fully reflecting surface of second round reversion GaP crystal；The pump light of roundtrip propagation exists along the y axis
The total reflection point that second round inverts GaP crystal generates Stokes light and the second terahertz by quasi-phase matched optical parameter effect
The Stokes light of hereby wave, generation is collinearly propagated with pump light, and the second THz wave of generation is brilliant perpendicular to second round reversion GaP
The fully reflecting surface of body is emitted, and in N number of cycle period of pump light, generates N beam second too in second round reversion GaP crystal
Hertz wave；
The pump light of roundtrip propagation passes through quasi-phase matched light in the total reflection point of period 3 reversion GaP crystal along the x axis
It learns parametric effect and generates Stokes light and third THz wave, the Stokes light of generation and collinearly propagated with pump light, the of generation
Three THz waves are emitted perpendicular to the fully reflecting surface of period 3 reversion GaP crystal；The pump light of roundtrip propagation exists along the y axis
The total reflection point that period 3 inverts GaP crystal generates Stokes light and third terahertz by quasi-phase matched optical parameter effect
The Stokes light of hereby wave, generation is collinearly propagated with pump light, and the third THz wave of generation is brilliant perpendicular to period 3 reversion GaP
The fully reflecting surface of body is emitted, and in N number of cycle period of pump light, generates N beam third too in period 3 reversion GaP crystal
Hertz wave；
The pump light of roundtrip propagation passes through quasi-phase matched light in the total reflection point of period 4 reversion GaP crystal along the x axis
It learns parametric effect and generates Stokes light and the 4th THz wave, the Stokes light of generation and collinearly propagated with pump light, the of generation
Four THz waves are emitted perpendicular to the fully reflecting surface of period 4 reversion GaP crystal；The pump light of roundtrip propagation exists along the y axis
The total reflection point that period 4 inverts GaP crystal generates Stokes light and the 4th terahertz by quasi-phase matched optical parameter effect
The Stokes light of hereby wave, generation is collinearly propagated with pump light, and the 4th THz wave of generation is brilliant perpendicular to period 4 reversion GaP
The fully reflecting surface of body is emitted, and in N number of cycle period of pump light, generates N beam the 4th too in period 4 reversion GaP crystal
Hertz wave.
Above-mentioned high efficiency terahertz-wave parametric oscillator, first resonator mirror are humorous to pump light fractional transmission, second
Hysteroscope of shaking to Stokes light total reflection, constitutes Stokes light to pumping light total reflection, the first resonator mirror, the second resonator mirror
Resonant cavity.
Above-mentioned high efficiency terahertz-wave parametric oscillator, the period 1 reversion GaP crystal, second round invert GaP
Crystal, period 3 reversion GaP crystal and period 4 reversion GaP crystal are isosceles right triangle in X-Y plane；First
Periodic reversal GaP crystal, second round reversion GaP crystal, period 3 reversion GaP crystal and period 4 invert GaP crystal
Reflecting surface plate the total reflection film of pump light and Stokes light；Period 1 inverts GaP crystal and period 3 reversion GaP is brilliant
The period polarized wave vector direction of body inverts GaP crystal, the 4th in X-Y plane two, four-quadrant and X-axis angle at 45 °, second round
The period polarized wave vector direction of periodic reversal GaP crystal is in X-Y plane one, three quadrant and X-axis angle at 45 °；Period 1 is anti-
Turn the reversion of GaP crystal, second round reversion GaP crystal, period 3 reversion GaP crystal and period 4 reversion GaP crystal
Period is equal；The position of period 4 reversion GaP crystal is lower than the position of period 1 reversion GaP crystal in the Y-axis direction,
Guarantee from the pump light of resonator mirror just without the period 4 invert GaP crystal and directly vertical incidence to first week
Phase inverts GaP crystal.
Above-mentioned high efficiency terahertz-wave parametric oscillator, the first terahertz that the pump light of roundtrip propagation generates along the x axis
Hereby wave is identical as the first THz wave direction of propagation that the pump light of roundtrip propagation along the y axis generates and frequency is equal.
Above-mentioned high efficiency terahertz-wave parametric oscillator, the second terahertz that the pump light of roundtrip propagation generates along the x axis
Hereby wave is identical as the second THz wave direction of propagation that the pump light of roundtrip propagation along the y axis generates and frequency is equal.
Above-mentioned high efficiency terahertz-wave parametric oscillator, the third terahertz that the pump light of roundtrip propagation generates along the x axis
Hereby wave is identical as the third THz wave direction of propagation that the pump light of roundtrip propagation along the y axis generates and frequency is equal.
Above-mentioned high efficiency terahertz-wave parametric oscillator, the 4th terahertz that the pump light of roundtrip propagation generates along the x axis
Hereby wave is identical as the 4th THz wave direction of propagation that the pump light of roundtrip propagation along the y axis generates and frequency is equal.
The wavelength of above-mentioned high efficiency terahertz-wave parametric oscillator, the Stokes light is equal, first Terahertz
Wave, the second THz wave, third THz wave, the 4th THz wave frequency be equal.
A kind of high efficiency terahertz-wave parametric oscillator of the present invention and the existing Terahertz spoke based on optical parameter effect
The source of penetrating is compared, and is had the advantage that
1. a branch of pump light can produce multi beam THz wave, optical conversion efficiencies are effectively increased.
2. Stokes light and pump light can be recycled during optical parameter, pump light is effectively improved using effect
Rate.
3. THz wave is emitted perpendicular to periodic reversal GaP crystal, any output coupler is not needed, is effectively reduced too
Hertz wave output loss.
4. pump light and Stokes light collinearly interact, effectively increase between pump light, Stokes light and THz wave
Interaction volume.
Detailed description of the invention
Fig. 1 is the structure principle chart of the embodiment of the present invention.
Fig. 2 is pump light, Stokes light and THz wave phase matched schematic diagram in periodic reversal GaP crystal.K in figurep、
Ks、KTThe respectively wave vector of pump light, Stokes light, THz wave, KΛFor the period polarized wave vector of periodic reversal GaP crystal.Figure
In 8,9,10,11 to respectively indicate period 1 reversion GaP crystal in Fig. 1, reversion GaP crystal, period 3 second round anti-
Turn GaP crystal, period 4 reversion GaP crystal.
Specific embodiment
The present invention will be further described in detail with reference to the accompanying drawing.
It is as shown in Figure 1 a kind of structure principle chart of high efficiency terahertz-wave parametric oscillator embodiment of the present invention.By scheming
It is found that the terahertz emission source includes: pumping source 1, the first reflecting mirror 3, the second reflecting mirror 4, the first resonator mirror 5, second is humorous
Vibration hysteroscope 6, period 1 invert GaP crystal 8, second round reversion GaP crystal 9, period 3 reversion GaP crystal the 10, the 4th
Periodic reversal GaP crystal 11.
The pumping source 1 that the present embodiment uses is quasi-continuous laser, wavelength 536.5nm, pulse width 30ns, repeats
Frequency is 100KHz, power density 50MW/cm2。
The pump light 2 that pumping source 1 issues partially passes through the first resonance after the first reflecting mirror 3, the reflection of the second reflecting mirror 4
The vertical incidence period 1 inverts GaP crystal 8 after hysteroscope 5, is totally reflected in the reflecting surface of period 1 reversion GaP crystal 8
GaP crystal 9 is inverted vertically into second round afterwards, pump light 2 is all-trans in the reflecting surface of second round reversion GaP crystal 9
GaP crystal 10 is inverted vertically into the period 3 after penetrating, pump light 2 occurs in the reflecting surface of period 3 reversion GaP crystal 10
GaP crystal 11, reflecting surface of the pump light 2 in period 4 reversion GaP crystal 11 are inverted vertically into the period 4 after total reflection
GaP crystal 8 is inverted vertically into the period 1 after being totally reflected, forms the 1st cycle period of pump light 2.First is followed
The 2 vertical incidence period 1 of pump light that the ring period comes out inverts GaP crystal 8, in the reflection of period 1 reversion GaP crystal 8
Face be totally reflected after vertically into second round invert GaP crystal 9, pump light 2 second round reversion GaP crystal 9 it is anti-
The face of penetrating be totally reflected after vertically into the period 3 invert GaP crystal 10, pump light 2 the period 3 invert GaP crystal 10
Reflecting surface be totally reflected after vertically into the period 4 invert GaP crystal 11, pump light 2 is brilliant in period 4 reversion GaP
The reflecting surface of body 11 be totally reflected after vertically into the period 1 invert GaP crystal 8, formed pump light 2 the 2nd circulating cycle
Phase.And so on, pump light 2 inverts GaP crystal 8, second round reversion GaP crystal 9, period 3 reversion in the period 1
N number of period is recycled between GaP crystal 10 and period 4 reversion GaP crystal 11, N is positive integer, until pump light 2 is in 4th week
The reflecting surface of phase reversion GaP crystal 11 does not re-shoot period 1 reversion GaP crystal 8 after being totally reflected, and incidence second is humorous
Vibration hysteroscope 6, circulation terminates.It is totally reflected after 2 the second resonator mirror of vertical incidence 6 of pump light, along backtracking.Pump light 2,
Stokes light 7, the first THz wave 12, the second THz wave 13, third THz wave 14, the phase between the 4th THz wave 15
Position match condition is as shown in Figure 2.
The pump light 2 of roundtrip propagation passes through quasi- phase in the total reflection point of period 1 reversion GaP crystal 8 along the x axis
Matching optics parametric effect generates Stokes light 7 and the first THz wave 12, and the Stokes light 7 and pump light 2 of generation collinearly pass
It broadcasts, the first THz wave 12 of generation is emitted perpendicular to the fully reflecting surface of period 1 reversion GaP crystal 8；It is round-trip along the y axis
The pump light 2 of propagation is generated in the total reflection point of period 1 reversion GaP crystal 8 by quasi-phase matched optical parameter effect
Stokes light 7 and the first THz wave 12, the Stokes light 7 and pump light 2 of generation are collinearly propagated, the first THz wave of generation
12 fully reflecting surfaces for inverting GaP crystal 8 perpendicular to the period 1 are emitted.Along the x axis the pump light 2 of roundtrip propagation generate the
12 direction of propagation of the first THz wave that the pump light 2 of one THz wave 12 and roundtrip propagation along the y axis generates is identical and frequency
Rate is equal.In N number of cycle period of pump light 2, it can be inverted in the period 1 and generate the first Terahertz of N beam in GaP crystal 8
Wave 12.
The pump light 2 of roundtrip propagation passes through quasi- phase in the total reflection point of second round reversion GaP crystal 9 along the x axis
Matching optics parametric effect generates Stokes light 7 and the second THz wave 13, and the Stokes light 7 and pump light 2 of generation collinearly pass
It broadcasts, the second THz wave 13 of generation is emitted perpendicular to the fully reflecting surface of second round reversion GaP crystal 9；It is round-trip along the y axis
The pump light 2 of propagation is generated in the total reflection point of second round reversion GaP crystal 9 by quasi-phase matched optical parameter effect
Stokes light 7 and the second THz wave 13, the Stokes light 7 and pump light 2 of generation are collinearly propagated, the second THz wave of generation
13 fully reflecting surfaces for inverting GaP crystal 9 perpendicular to second round are emitted；Along the x axis the pump light 2 of roundtrip propagation generate the
13 direction of propagation of the second THz wave that the pump light 2 of two THz waves 13 and roundtrip propagation along the y axis generates is identical and frequency
Rate is equal.In N number of cycle period of pump light 2, it can be inverted in second round and generate the second Terahertz of N beam in GaP crystal 9
Wave 13.
The pump light 2 of roundtrip propagation passes through quasi- phase in the total reflection point of period 3 reversion GaP crystal 10 along the x axis
Matching optics parametric effect generates Stokes light 7 and third THz wave 14, and the Stokes light 7 and pump light 2 of generation collinearly pass
It broadcasts, the third THz wave 14 of generation is emitted perpendicular to the fully reflecting surface of period 3 reversion GaP crystal 10；It is past along the y axis
The pump light 2 that back pass is broadcast is produced in the total reflection point of period 3 reversion GaP crystal 10 by quasi-phase matched optical parameter effect
Raw Stokes light 7 and third THz wave 14, the Stokes light 7 and pump light 2 of generation are collinearly propagated, the third Terahertz of generation
Wave 14 is emitted perpendicular to the fully reflecting surface of period 3 reversion GaP crystal 10；The pump light 2 of roundtrip propagation generates along the x axis
14 direction of propagation of third THz wave that generates of pump light 2 of third THz wave 14 and roundtrip propagation along the y axis it is identical
And frequency is equal.In N number of cycle period of pump light 2, it can be inverted in the period 3 and generate N beam third in GaP crystal 10
THz wave 14.
The pump light 2 of roundtrip propagation passes through quasi- phase in the total reflection point of period 4 reversion GaP crystal 11 along the x axis
Matching optics parametric effect generates Stokes light 7 and the 4th THz wave 15, and the Stokes light 7 and pump light 2 of generation collinearly pass
It broadcasts, the 4th THz wave 15 of generation is emitted perpendicular to the fully reflecting surface of period 4 reversion GaP crystal 11；It is past along the y axis
The pump light 2 that back pass is broadcast is produced in the total reflection point of period 4 reversion GaP crystal 11 by quasi-phase matched optical parameter effect
Raw Stokes light 7 and the 4th THz wave 15, the Stokes light 7 and pump light 2 of generation are collinearly propagated, the 4th Terahertz of generation
Wave 15 is emitted perpendicular to the fully reflecting surface of period 4 reversion GaP crystal 11；The pump light 2 of roundtrip propagation generates along the x axis
15 direction of propagation of the 4th THz wave that generates of pump light 2 of the 4th THz wave 15 and roundtrip propagation along the y axis it is identical
And frequency is equal.In N number of cycle period of pump light 2, it can be inverted in the period 4 and generate N beam the 4th in GaP crystal 11
THz wave 15.
The first reflecting mirror 3 that the present embodiment uses, the second reflecting mirror 4, the first resonator mirror 5, the second resonator mirror 6 are all
Plane mirror.First reflecting mirror 3, the second reflecting mirror 4 are totally reflected the pump light 2 that wavelength is 536.5nm.First resonator mirror 5 is right
2 transmitance of pump light is 50%, and the second resonator mirror 6 is totally reflected pump light 2.First resonator mirror 5, the second resonator mirror 6 are right
Stokes light 7 is totally reflected, and constitutes the resonant cavity of Stokes light 7.
A kind of high efficiency terahertz-wave parametric oscillator, the period 1 reversion GaP crystal 8, second round invert GaP
Crystal 9, period 3 reversion GaP crystal 10, period 4 reversion GaP crystal 11 are isosceles right triangle in X-Y plane, directly
Arm of angle side length is 1.5cm.Period 1 inverts GaP crystal 8, second round reversion GaP crystal 9, period 3 reversion GaP crystal
10, the period 4 reversion GaP crystal 11 reflecting surface plating total reflection film, reflectance coating to wave-length coverage 520-560nm pumping
Light 2 and Stokes light 7 are totally reflected.Period 1 inverts the period polarized wave vector of GaP crystal 8, period 3 reversion GaP crystal 10
Direction is in X-Y plane two, four-quadrant and X-axis angle at 45 °, and second round inverts GaP crystal 9, the period 4 inverts GaP crystal
11 period polarized wave vector direction is in X-Y plane one, three quadrant and X-axis angle at 45 °.Period 1 inverts GaP crystal 8, the
Two cycles invert GaP crystal 9, the period 3 inverts GaP crystal 10, the returing cycle of period 4 reversion GaP crystal 11 is equal,
It is equal to 28.81 μm.The position of period 4 reversion GaP crystal 11 is lower than period 1 reversion GaP crystal 8 in the Y-axis direction
Position, guarantee to invert GaP crystal 11 and direct without the period 4 just from the pump lights 2 of the first resonator mirror 5s
Vertical incidence to the period 1 inverts GaP crystal 8.
In the present embodiment, the wavelength of Stokes light 7 is equal, and is equal to 536.98nm.First THz wave 12,
Two THz waves 13, third THz wave 14, the 4th THz wave 15 frequency be equal, be equal to 0.5THz.
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 (8)
1. a kind of high efficiency terahertz-wave parametric oscillator, it is characterised in that: including pumping source (1) and periodic reversal GaP crystal,
Periodic reversal GaP crystal includes period 1 reversion GaP crystal (8), second round reversion GaP crystal (9), period 3 reversion
GaP crystal (10) and period 4 reversion GaP crystal (11), between period 1 reversion GaP crystal (8) and pumping source (1)
The first reflecting mirror (3), the second reflecting mirror (4) and the first resonator mirror (5) are set gradually from the front to the back, are inverted in the period 1
The second resonator mirror (6) are arranged in GaP crystal (8) side；
The pump light (2) that pumping source (1) issues partially passes through the first resonance after the first reflecting mirror (3) and the second reflecting mirror (4)
Hysteroscope (5) after vertical incidence period 1 reversion GaP crystal (8), is sent out afterwards in the reflecting surface of period 1 reversion GaP crystal (8)
GaP crystal (9) are inverted vertically into second round after raw total reflection, pump light (2) is in second round reversion GaP crystal (9)
Reflecting surface be totally reflected after vertically into the period 3 invert GaP crystal (10), pump light (2) the period 3 invert GaP
The reflecting surface of crystal (10) be totally reflected after vertically into the period 4 invert GaP crystal (11), pump light (2) is in 4th week
Phase reversion GaP crystal (11) reflecting surface be totally reflected after vertically into the period 1 invert GaP crystal (8), formed pump
First cycle period of light (2)；Pump light (2) the vertical incidence period 1 inverts GaP crystal (8), inverts in the period 1
The reflecting surface of GaP crystal (8) be totally reflected after vertically into second round invert GaP crystal (9), pump light (2) is second
The reflecting surface of periodic reversal GaP crystal (9) be totally reflected after vertically into the period 3 invert GaP crystal (10), pump light
(2) GaP crystal is inverted vertically into the period 4 after the reflecting surface of period 3 reversion GaP crystal (10) is totally reflected
(11), pump light (2) is anti-vertically into the period 1 after the reflecting surface of period 4 reversion GaP crystal (11) is totally reflected
Turn GaP crystal (8), forms second cycle period of pump light (2)；And so on, pump light (2) is inverted in the period 1
GaP crystal (8), second round reversion GaP crystal (9), period 3 reversion GaP crystal (10) and period 4 reversion GaP are brilliant
N number of period is recycled between body (11), N is positive integer, until the reflection of pump light (2) in period 4 reversion GaP crystal (11)
Face does not re-shoot period 1 reversion GaP crystal (8) after being totally reflected, and incident second resonator mirror (6), circulation terminate,
Pump light (2) the second resonator mirror of vertical incidence (6) is totally reflected afterwards, along backtracking；
The plane for pumping light propagation is plane determined by X-axis and Y-axis, plane of the Z axis perpendicular to beam propagation, X-axis and pumping
The direction of the pump light of source outgoing is parallel, and the direction of the pump light of pumping source outgoing is that X-axis is positive；
The pump light (2) of roundtrip propagation passes through quasi- phase in the total reflection point of period 1 reversion GaP crystal (8) along the x axis
Matching optics parametric effect generates Stokes light (7) and the first THz wave (12), the Stokes light (7) and pump light of generation
(2) conllinear to propagate, the first THz wave (12) of generation is emitted perpendicular to the fully reflecting surface of period 1 reversion GaP crystal (8)；
The pump light (2) of roundtrip propagation passes through quasi-phase matched in the total reflection point of period 1 reversion GaP crystal (8) along the y axis
Optical parameter effect generates Stokes light (7) and the first THz wave (12), and the Stokes light (7) of generation and pump light (2) are altogether
Line is propagated, and the first THz wave (12) of generation is emitted perpendicular to the fully reflecting surface of period 1 reversion GaP crystal (8), is being pumped
In N number of cycle period of Pu light (2), the period 1 inverts in GaP crystal (8) and generates the first THz wave of N beam (12)；
The pump light (2) of roundtrip propagation passes through quasi- phase in the total reflection point of second round reversion GaP crystal (9) along the x axis
Matching optics parametric effect generates Stokes light (7) and the second THz wave (13), the Stokes light (7) and pump light of generation
(2) conllinear to propagate, the second THz wave (13) of generation is emitted perpendicular to the fully reflecting surface of second round reversion GaP crystal (9)；
The pump light (2) of roundtrip propagation passes through quasi-phase matched in the total reflection point of second round reversion GaP crystal (9) along the y axis
Optical parameter effect generates Stokes light (7) and the second THz wave (13), and the Stokes light (7) of generation and pump light (2) are altogether
Line is propagated, and the second THz wave (13) of generation is emitted perpendicular to the fully reflecting surface of second round reversion GaP crystal (9), is being pumped
In N number of cycle period of Pu light (2), second round inverts in GaP crystal (9) and generates the second THz wave of N beam (13)；
The pump light (2) of roundtrip propagation passes through quasi- phase in the total reflection point of period 3 reversion GaP crystal (10) along the x axis
Matching optics parametric effect generates Stokes light (7) and third THz wave (14), the Stokes light (7) and pump light of generation
(2) conllinear to propagate, the third THz wave (14) of generation goes out perpendicular to the fully reflecting surface of period 3 reversion GaP crystal (10)
It penetrates；The pump light (2) of roundtrip propagation passes through quasi- phase in the total reflection point of period 3 reversion GaP crystal (10) along the y axis
Matching optics parametric effect generates Stokes light (7) and third THz wave (14), the Stokes light (7) and pump light of generation
(2) conllinear to propagate, the third THz wave (14) of generation goes out perpendicular to the fully reflecting surface of period 3 reversion GaP crystal (10)
It penetrates, in N number of cycle period of pump light (2), N beam third THz wave is generated in period 3 reversion GaP crystal (10)
(14)；
The pump light (2) of roundtrip propagation passes through quasi- phase in the total reflection point of period 4 reversion GaP crystal (11) along the x axis
Matching optics parametric effect generates Stokes light (7) and the 4th THz wave (15), the Stokes light (7) and pump light of generation
(2) conllinear to propagate, the 4th THz wave (15) of generation goes out perpendicular to the fully reflecting surface of period 4 reversion GaP crystal (11)
It penetrates；The pump light (2) of roundtrip propagation passes through quasi- phase in the total reflection point of period 4 reversion GaP crystal (11) along the y axis
Matching optics parametric effect generates Stokes light (7) and the 4th THz wave (15), the Stokes light (7) and pump light of generation
(2) conllinear to propagate, the 4th THz wave (15) of generation goes out perpendicular to the fully reflecting surface of period 4 reversion GaP crystal (11)
It penetrates, in N number of cycle period of pump light (2), the 4th THz wave of N beam is generated in period 4 reversion GaP crystal (11)
(15).
2. high efficiency terahertz-wave parametric oscillator according to claim 1, it is characterised in that: first resonator mirror
(5) to pump light fractional transmission, the second resonator mirror (6) is to pumping light total reflection, the first resonator mirror (5), the second resonant cavity
Mirror (6) is totally reflected Stokes light (7), constitutes the resonant cavity of Stokes light (7).
3. high efficiency tera-hertz parametric oscillator according to claim 1, it is characterised in that: the period 1 reversion
GaP crystal (8), second round reversion GaP crystal (9), period 3 reversion GaP crystal (10) and period 4 reversion GaP are brilliant
Body (11) is isosceles right triangle in X-Y plane；Period 1 inverts GaP crystal (8), second round inverts GaP crystal
(9), the period 3 reversion GaP crystal (10) and the period 4 invert GaP crystal (11) reflecting surface plate pump light (2) and
The total reflection film of Stokes light (7)；Period 1 inverts the period pole of GaP crystal (8) and period 3 reversion GaP crystal (10)
Change wave vector direction in X-Y plane two, four-quadrant and X-axis angle at 45 °, second round reversion GaP crystal (9), period 4 are anti-
Turn the period polarized wave vector direction of GaP crystal (11) in X-Y plane one, three quadrant and X-axis angle at 45 °；Period 1 reversion
GaP crystal (8), second round reversion GaP crystal (9), period 3 reversion GaP crystal (10) and period 4 reversion GaP are brilliant
The returing cycle of body (11) is equal；It is anti-that the position of period 4 reversion GaP crystal (11) is lower than the period 1 in the Y-axis direction
Turn the position of GaP crystal (8), guarantees that (pump light (2) of 5)s inverts GaP without the period 4 just from resonator mirror
Crystal (11) and directly vertical incidence to the period 1 invert GaP crystal (8).
4. high efficiency tera-hertz parametric oscillator according to claim 1, it is characterised in that: roundtrip propagation along the x axis
The first terahertz for generating of the pump light (2) of the first THz wave (12) and roundtrip propagation along the y axis that generates of pump light (2)
Hereby wave (12) direction of propagation is identical and frequency is equal.
5. high efficiency tera-hertz parametric oscillator according to claim 1, it is characterised in that: roundtrip propagation along the x axis
The second terahertz for generating of the pump light (2) of the second THz wave (13) and roundtrip propagation along the y axis that generates of pump light (2)
Hereby wave (13) direction of propagation is identical and frequency is equal.
6. high efficiency tera-hertz parametric oscillator according to claim 1, it is characterised in that: roundtrip propagation along the x axis
The third terahertz that generates of the pump light (2) of third THz wave (14) and roundtrip propagation along the y axis that generates of pump light (2)
Hereby wave (14) direction of propagation is identical and frequency is equal.
7. high efficiency tera-hertz parametric oscillator according to claim 1, it is characterised in that: roundtrip propagation along the x axis
The 4th terahertz that generates of the pump light (2) of the 4th THz wave (15) and roundtrip propagation along the y axis that generates of pump light (2)
Hereby wave (15) direction of propagation is identical and frequency is equal.
8. high efficiency tera-hertz parametric oscillator according to claim 1, it is characterised in that: the Stokes light (7)
Wavelength is equal, first THz wave (12), the second THz wave (13), third THz wave (14), the 4th Terahertz
The frequency of wave (15) is equal.
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