CN106207717B - A kind of multi beam terahertz radiation source based on optical difference frequency effect - Google Patents
A kind of multi beam terahertz radiation source based on optical difference frequency effect Download PDFInfo
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- CN106207717B CN106207717B CN201610820304.1A CN201610820304A CN106207717B CN 106207717 B CN106207717 B CN 106207717B CN 201610820304 A CN201610820304 A CN 201610820304A CN 106207717 B CN106207717 B CN 106207717B
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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 invention discloses a kind of multi beam terahertz radiation source based on optical difference frequency effect, the pump light incidence KTP optical parametric oscillators being emitted from pumping source generate two beam polarized orthogonal difference frequency lights through optical parameter effect；Two beam polarized orthogonal difference frequency lights become the parallel difference frequency light of two beams polarization after quarter-wave plate and Glan prism；Two beams polarize parallel difference frequency light vertical incidence PPLN crystal after optical beam scanner, and are emitted from crystal after multiple total reflection occurs respectively for crystal left-half and right half part；Meet quasi-phase matched in each two beam difference frequency light of total reflection point and THz wave, generates THz wave through optical difference frequency effect, THz wave wave vector is emitted perpendicular to crystal and from crystal；Multiple total reflection points can be set in PPLN crystal, so as to generate multi beam THz wave.Two beam difference frequency lights can generate multi beam THz waves, effectively improve difference frequency light utilization ratio and THz wave conversion quantum efficiencies.
Description
Technical field
The invention belongs to THz wave technology application fields, and in particular to a kind of multiple beam based on optical difference frequency effect is too
Hertz wave radiation source.
Background technology
Terahertz（Terahertz, abbreviation THz, 1THz=1012Hz）Wave refers to electricity of the frequency within the scope of 0.1-10 THz
Magnetic wave, wave band is between millimeter wave and infrared waves.This wave band is not only to be considered only as traditional microwave wave band and optics wave
The region that section is mutually connected, and it is also considered as the transition section of both macro and micro.With two adjacent wave band differences because lack
The generation of weary effective THz wave and Detection Techniques, terahertz wave band do not obtain more systematic research for a long time.Cause
It is very limited to the understanding of terahertz wave band various characteristics for people, so terahertz wave band is also referred to as electromagnetic spectrum
" Terahertz gap ".
THz wave between microwave band and light-wave band has many special properties.First, many organic
The vibration of macromolecular and rotational frequency are concentrated mainly on terahertz wave band, thus they can generate strongly corresponding THz wave
Absorption and resonance.This characteristic, which can be used in, examines certain special compounds, such as drugs.Secondly, THz wave
Some substances opaque in visible light and infrared band can be penetrated, such as：Clothing, timber, paper and plastics etc..Therefore, I
Terahertz emission detection of concealed can be utilized in these entrainments in the substance that terahertz wave band is transparent, defect, damage
Wound etc..Again, compared with X-ray, THz wave has longer wavelength.So, in the energy of terahertz wave band single photon
Amount will be more much lower than the photon energy in X-ray wave band.Then, in the application in terms of medicine and biology, Terahertz
Bobbi X-ray shows higher safety.Finally, it compares with microwave, the wavelength of THz wave is shorter.Therefore,
In the application of imaging, THz wave imaging has spatial resolution more higher than microwave imaging so that formed image is more
Clearly.And in the communications field, terahertz wave band has broader bandwidth than microwave band.
What is lacked can generate high power, high quality, efficient THz wave, and low cost and can operate at room temperature
THz source be the main problem faced at present.The production method of THz wave mainly has electronics method and photonic propulsion 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 one
The process that frequency becomes larger, but prodigious obstacle can be encountered when frequency is more than 1THz, so that efficiency becomes very low, while electricity
The terahertz radiation source that sub- 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 spokes generated
Penetrating 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 multiple beam terahertz radiation sources based on optical difference frequency effect, to solve
The problems such as existing 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 multi beam terahertz radiation source based on optical difference frequency effect, including pumping source, KTP optical parametric oscillators
Device, filter mirror, quarter-wave plate, Glan prism, optical beam scanner and PPLN crystal；
The pump light incidence KTP optical parametric oscillators being emitted from pumping source generate two beams polarization through optical parameter effect
Orthogonal difference frequency light；Two beam polarized orthogonal difference frequency lights become the parallel difference frequency of two beams polarization after quarter-wave plate and Glan prism
Light；Two beams polarize parallel difference frequency light vertical incidence PPLN crystal after optical beam scanner, and in crystal left-half and right side
Divide after multiple total reflection occurs respectively and is emitted from crystal；Meet quasi- phase in each two beam difference frequency light of total reflection point and THz wave
Position matching generates THz wave through optical difference frequency effect, and THz wave wave vector is emitted perpendicular to crystal and from crystal；In PPLN crystalline substances
Multiple total reflection points can be set in vivo, so as to generate multi beam THz wave.
The KTP optical parametric oscillators include the first plane mirror, the first ktp crystal, the second ktp crystal and the second plane
Mirror, the pump light being emitted from pumping source is inputted by the first plane mirror, and passes through the first ktp crystal and the second ktp crystal successively, most
It is exported eventually by the second plane mirror.
The pump light that the pumping source is sent out is through incident two pieces of identical first ktp crystals and second of the first plane mirror
Ktp crystal, using II type-Ⅱphase matchings（o→e+o）Mode generates two beam difference frequency lights through optical parameter effectλ 1Withλ 2, first
Ktp crystal and the second ktp crystal are symmetrically placed, i.e. the first ktp crystal rotates 180 ° along Z axis and obtains the second ktp crystal, puts in this way
Difference frequency light can be eliminated by settingλ 1Withλ 2Walking off in ktp crystal；Difference frequency lightλ 1Withλ 2By the first plane mirror and the second plane mirror
Amplification is vibrated in the resonant cavity of composition, and is exported through the second plane mirror.
First plane mirror is high to 532nm light thoroughly, and high to 900-1200nm light anti-, the second plane mirror is to 900-1200nm
Light transmission rate is 20%.
The size of first ktp crystal and the second ktp crystal is 15mm（X-axis）×7mm（Y-axis）×8mm（Z axis）.
It is provided with the first polyethylene lens on the right side of the PPLN crystal, the second polyethylene is provided on the left of PPLN crystal
Lens, the multi beam THz wave that PPLN crystal right side is emitted are focused by the first polyethylene lens, and what is be emitted on the left of PPLN crystal is more
Beam THz wave is focused by the second polyethylene lens.
The pumping source is 532nm green light continuous wave lasers, and line width is in 1MHz, power 20W.
The filter mirror is to 532nm pump light 45° angle high reflections, to difference frequency lightλ 1Withλ 2It is highly transmissive.
The PPLN crystal is parallelogram in X-Y plane, is divided into left-half and right half part, optical axis is parallel to
It is poor that the polarization cycle vector of the polarization direction of two beam difference frequency lights, PPLN crystal left-half and right half part is respectively perpendicular to upper left
Frequency light wave resultant upper right difference frequency light wave vector.
It is coated with difference frequency light total reflection film on the THz wave exit facet of the PPLN crystal.
The present invention is based on the multiple beam terahertz radiation source of optical difference frequency effect with it is existing based on beat effect too
Hertzion radiation source is compared, and is had the following advantages：
（1）Two beam difference frequency lights can generate multi beam THz waves, effectively improve difference frequency light utilization ratio and the conversion of THz wave quantum
Efficiency.
（2）Difference frequency process uses quasi-phase matched mode, and two beam difference frequency lights and THz waves collinearly interact, effectively improve
Three-wave interaction volume.
（3）THz waves wave vector is directly emitted from plane of crystal perpendicular to crystal, does not need other output couplers, reduces
THz wave coupling-out losses.
（4）The two beam difference frequency lights that wavelength tuning is obtained using ktp crystal optical parametric oscillator, may be implemented THz waves
Frequency tuning exports, and tuning manner is simple, and operation is flexible.
Description of the drawings
Fig. 1 is the structure principle chart of the embodiment of the present invention.
Fig. 2 is the k in figure for two beam difference frequency lights in PPLN crystal and THz wave phase matched schematic diagram1、k2、kT、kΛPoint
It Wei not difference frequency lightλ 1, difference frequency lightλ 2, THz wave, the wave vector in PPLN Crystal polarization periods, the angles θ be difference frequency light wave vector k1With THz waves
Wave vector kTBetween angle.
Fig. 3 is the relationship between phase matching angle θ, THz wave frequency, PPLN polarization cycles Λ, assumes λ in figure1For
1064nm。
Wherein, 1 is pumping source；2 be the first plane mirror；3 be the first ktp crystal；4 be the second ktp crystal；5 be second flat
Face mirror；6 be filter mirror；7 be quarter-wave plate；8 be Glan prism；9 be optical beam scanner；10 be PPLN crystal；11 be
One polyethylene lens；12 be the second polyethylene lens.
Specific implementation mode
As shown in Fig. 1, a kind of multi beam terahertz radiation source based on optical difference frequency effect, it is characterised in that：Including
Pumping source 1, KTP optical parametric oscillators, filter mirror 6, quarter-wave plate 7, Glan prism 8, optical beam scanner 9 and PPLN are brilliant
Body 10；Wherein, PPLN crystal 10 is periodically poled lithium niobate crystal.
The pump light incidence KTP optical parametric oscillators being emitted from pumping source 1 generate two beams polarization through optical parameter effect
Orthogonal difference frequency light；Two beam polarized orthogonal difference frequency lights become the parallel difference frequency of two beams polarization after quarter-wave plate 7 and Glan prism 8
Light；Two beams polarize parallel difference frequency light vertical incidence PPLN crystal 10 after optical beam scanner 9, and in crystal left-half and right half
Part is emitted after multiple total reflection occurs respectively from crystal；Meet in each two beam difference frequency light of total reflection point and THz wave accurate
Phase matched generates THz wave through optical difference frequency effect, and THz wave wave vector is emitted perpendicular to crystal and from crystal；In PPLN
Multiple total reflection points can be set in crystal 10, so as to generate multi beam THz wave.
KTP optical parametric oscillators include the first plane mirror 2, the first ktp crystal 3, the second ktp crystal 4 and the second plane
Mirror 5, the pump light being emitted from pumping source 1 are inputted by the first plane mirror 2, and pass through the first ktp crystal 3 and the 2nd KTP crystalline substances successively
Body 4 is finally exported by the second plane mirror 5.
The pump light that pumping source 1 is sent out is through incident two pieces of identical first ktp crystals 3 and second of the first plane mirror 2
Ktp crystal 4, using II type-Ⅱphase matchings（o→e+o）Mode generates two beam difference frequency lights through optical parameter effectλ 1Withλ 2, first
Ktp crystal 3 and the second ktp crystal 4 are symmetrically placed, i.e. the first ktp crystal 3 rotates 180 ° along Z axis and obtains the second ktp crystal 4, this
Sample placement can eliminate difference frequency lightλ 1Withλ 2Walking off in ktp crystal；Difference frequency lightλ 1Withλ 2By the first plane mirror 2 and second
Amplification is vibrated in the resonant cavity that plane mirror 5 forms, and is exported through the second plane mirror 5.By being adjusted in synchronism 3 He of the first ktp crystal
The azimuth of second ktp crystal 4 can obtain the difference frequency light of wavelength tuningλ 1Withλ 2。
First plane mirror 2 is high to 532nm light thoroughly, and high to 900-1200nm light anti-, the second plane mirror 5 is to 900-1200nm light
Transmitance is 20%.
The size of first ktp crystal 3 and the second ktp crystal 4 is 15mm（X-axis）×7mm（Y-axis）×8mm（Z axis）.
The right side of PPLN crystal 10 is provided with the first polyethylene lens 11, and the left side of PPLN crystal 10 is provided with the second poly- second
Alkene lens 12, the multi beam THz wave that 10 right side of PPLN crystal is emitted are focused by the first polyethylene lens 11, and PPLN crystal 10 is left
The multi beam THz wave of side outgoing is focused by the second polyethylene lens 12.
Pumping source 1 is 532nm green light continuous wave lasers, and line width is in 1MHz, power 20W.
Filter mirror 6 is to 532nm pump light 45° angle high reflections, to difference frequency lightλ 1Withλ 2It is highly transmissive.
PPLN crystal 10 is parallelogram in X-Y plane, is divided into left-half and right half part, optical axis is parallel to two
It is poor that the polarization cycle vector of the polarization direction of beam difference frequency light, 10 left-half of PPLN crystal and right half part is respectively perpendicular to upper left
Frequency light wave resultant upper right difference frequency light wave vector.
Difference frequency light total reflection film, i.e. 900-1200nm light total reflections are coated on the THz wave exit facet of PPLN crystal 10
Film.
The course of work of the present invention is as follows：Incident two pieces of identical first ktp crystals of pump light that pumping source 1 is sent out
3 and second ktp crystal 4, using II type-Ⅱphase matchings（o→e+o）Mode generates two beam difference frequency lights through optical parameter effectλ 1
Withλ 2.First ktp crystal 3 and the second ktp crystal 4 are symmetrically placed, i.e. the first ktp crystal 3 rotates 180 ° along Z axis and obtains second
Ktp crystal 4, it is positioned such that eliminating difference frequency lightλ 1Withλ 2Walking off in the first ktp crystal 3 and the second ktp crystal 4.Difference frequency
Lightλ 1Withλ 2Amplification is vibrated in the resonant cavity being made of the first plane mirror 2 and the second plane mirror 5, is exported through the second plane mirror 5,
Pump light 1 is filtered out via filter mirror 6.The difference frequency light λ that ktp crystal parametric process generates1And λ2Polarization direction is orthogonal, warp
Cross quarter-wave plate 7 becomes parallel with polarization direction both after Glan prism 8, and polarization direction is parallel to the light of PPLN crystal 10
Axis.Two beams polarize parallel difference frequency light vertical incidence PPLN crystal 10 after optical beam scanner 9, in the THz wave of PPLN crystal 10
Difference frequency light total reflection film is plated on exit facet.Difference frequency light occurs repeatedly to be all-trans respectively in 10 left-half of PPLN crystal and right half part
It is emitted from PPLN crystal 10 after penetrating.Meet quasi-phase matched in each two beam difference frequency light of total reflection point and THz wave, through light
It learns beat effect and generates THz wave, THz wave wave vector is emitted perpendicular to PPLN crystal 10 and from PPLN crystal 10, difference frequency light
It is as shown in Figure 2 with the phase matched of THz wave.The multiple total reflection points of setting, can generate multi beam terahertz in PPLN crystal 10
Hereby wave radiation.The right multi beam THz wave is focused by the first polyethylene lens 11, and left side multi beam THz wave is by the second polyethylene
Lens 12 focus.Change ktp crystal optical parametric oscillator phase-matching condition, obtains two beam difference frequency lights of wavelength tuning, it can
To obtain the THz wave of frequency tuning.As shown in figure 3, working as difference frequency lightλ 1Wavelength be 1064nm when, pass through change difference frequency lightλ 2
Wavelength can obtain frequency tuning range in the THz wave of 0.5-6THz ranges, the model of corresponding PPLN Crystal polarization periods lambdas
It is 140.4-7.1 μm to enclose, ranging from 63.6 ° -72.6 ° of phase matching angle θ.
What has been described above is only a preferred embodiment of the present invention, it is noted that for those skilled in the art,
Under the premise of not departing from general idea of the present invention, several changes and improvements can also be made, these should also be considered as the present invention's
Protection domain.
Claims (9)
1. a kind of multi beam terahertz radiation source based on optical difference frequency effect, it is characterised in that：Including pumping source（1）, KTP light
Learn parametric oscillator, filter mirror（6）, quarter-wave plate（7）, Glan prism（8）, optical beam scanner（9）With PPLN crystal
（10）；
From pumping source（1）The pump light incidence KTP optical parametric oscillators of outgoing are generating two beams polarization just through optical parameter effect
Hand over difference frequency light；Two beam polarized orthogonal difference frequency lights are through quarter-wave plate（7）And Glan prism（8）After become two beams polarization parallel error
Frequency light；Two beams polarize parallel difference frequency light through optical beam scanner（9）Vertical incidence PPLN crystal afterwards（10）, and in crystal left-half
It is emitted from crystal after multiple total reflection occurs respectively with right half part；In each two beam difference frequency light of total reflection point and THz wave
Meet quasi-phase matched, generates THz wave through optical difference frequency effect, THz wave wave vector is emitted perpendicular to crystal and from crystal；
In PPLN crystal（10）It is interior that multiple total reflection points can be set, so as to generate multi beam THz wave；
The PPLN crystal（10）It is parallelogram in X-Y plane, is divided into left-half and right half part, optical axis is parallel to
The polarization direction of two beam difference frequency lights, PPLN crystal（10）The polarization cycle vector of left-half and right half part is respectively perpendicular to a left side
Upper difference frequency light wave vector and upper right difference frequency light wave vector.
2. the multi beam terahertz radiation source according to claim 1 based on optical difference frequency effect, it is characterised in that：It is described
KTP optical parametric oscillators include the first plane mirror（2）, the first ktp crystal（3）, the second ktp crystal（4）With the second plane mirror
（5）, from pumping source（1）The pump light of outgoing is by the first plane mirror（2）Input, and pass through the first ktp crystal successively（3）With second
Ktp crystal（4）, finally by the second plane mirror（5）Output.
3. the multi beam terahertz radiation source according to claim 2 based on optical difference frequency effect, it is characterised in that：It is described
Pumping source（1）The pump light sent out is through the first plane mirror（2）Incident two pieces of identical first ktp crystals（3）With the 2nd KTP
Crystal（4）, using II type-Ⅱphase matchings（o→e+o）Mode generates two beam difference frequency lights through optical parameter effectλ 1Withλ 2, first
Ktp crystal（3）With the second ktp crystal（4）It is symmetrically placed, i.e. the first ktp crystal（3）180 °, which are rotated, along Z axis obtains the 2nd KTP crystalline substances
Body（4）, it is positioned such that eliminating difference frequency lightλ 1Withλ 2Walking off in ktp crystal；Difference frequency lightλ 1Withλ 2By the first plane mirror
（2）With the second plane mirror（5）Amplification is vibrated in the resonant cavity of composition, and through the second plane mirror（5）Output.
4. the multi beam terahertz radiation source according to claim 2 based on optical difference frequency effect, it is characterised in that：It is described
First plane mirror（2）It is high to 532nm light saturating, high to 900-1200nm light anti-, the second plane mirror（5）900-1200nm light is penetrated
Rate is 20%.
5. the multi beam terahertz radiation source according to claim 2 based on optical difference frequency effect, it is characterised in that：It is described
First ktp crystal（3）With the second ktp crystal（4）Size be 15mm（X-axis）×7mm（Y-axis）×8mm（Z axis）.
6. the multi beam terahertz radiation source according to claim 1 based on optical difference frequency effect, it is characterised in that：It is described
PPLN crystal（10）Right side be provided with the first polyethylene lens（11）, PPLN crystal（10）Left side be provided with the second polyethylene
Lens（12）, PPLN crystal（10）The multi beam THz wave of right side outgoing is by the first polyethylene lens（11）It focuses, PPLN crystal
（10）The multi beam THz wave of left side outgoing is by the second polyethylene lens（12）It focuses.
7. the multi beam terahertz radiation source according to claim 1 based on optical difference frequency effect, it is characterised in that：It is described
Pumping source（1）For 532nm green light continuous wave lasers, line width is in 1MHz, power 20W.
8. the multi beam terahertz radiation source according to claim 1 based on optical difference frequency effect, it is characterised in that：It is described
Filter mirror（6）To 532nm pump light 45° angle high reflections, to difference frequency lightλ 1Withλ 2It is highly transmissive.
9. the multi beam terahertz radiation source according to claim 1 based on optical difference frequency effect, it is characterised in that：It is described
PPLN crystal（10）THz wave exit facet on be coated with difference frequency light total reflection film.
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| CN113078950A (en) * | 2021-03-23 | 2021-07-06 | 中国科学技术大学 | Single photon source and single photon preparation method |
| WO2023082189A1 (en) * | 2021-11-12 | 2023-05-19 | 中国科学院深圳先进技术研究院 | Terahertz on-chip integrated chip and control method therefor, and on-chip integrated system |
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| WO2010104489A1 (en) * | 2009-03-10 | 2010-09-16 | Bae Systems Information And Electronic Systems Integration Inc. | Pump recycling scheme for terahertz generation |
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| CN104237164A (en) * | 2014-08-28 | 2014-12-24 | 华北水利水电大学 | Device and method for measuring refractive index of nonlinear optical crystal in terahertz band |
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| WO2010104489A1 (en) * | 2009-03-10 | 2010-09-16 | Bae Systems Information And Electronic Systems Integration Inc. | Pump recycling scheme for terahertz generation |
| CN103427328A (en) * | 2013-08-23 | 2013-12-04 | 天津大学 | Broad-tuning waveguide terahertz radiation source |
| CN104237164A (en) * | 2014-08-28 | 2014-12-24 | 华北水利水电大学 | Device and method for measuring refractive index of nonlinear optical crystal in terahertz band |
| CN205122984U (en) * | 2015-11-17 | 2016-03-30 | 天津大学 | Compact optics difference frequency terahertz is source now |
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