CN104269720B - A kind of terahertz emission source based on inner chamber optical parameter and beat effect - Google Patents
A kind of terahertz emission source based on inner chamber optical parameter and beat effect Download PDFInfo
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- CN104269720B CN104269720B CN201410454898.XA CN201410454898A CN104269720B CN 104269720 B CN104269720 B CN 104269720B CN 201410454898 A CN201410454898 A CN 201410454898A CN 104269720 B CN104269720 B CN 104269720B
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Abstract
The present invention relates to a kind of terahertz emission source based on inner chamber optical parameter and beat effect, including pump light source, the first ktp crystal 9, the second ktp crystal 10, periodical poled crystal 12.The optical parametric oscillator that pumping optical pumping is made up of double ktp crystals, produces two beam difference frequency lights, two beam difference frequency lights incidence periodical poled crystal 12 to produce THz wave based on optical difference frequency effect in difference frequency optical cavity.Two beam difference frequency lights can occur cascaded optical parametric effect generation THz wave respectively as pump light difference Energizing cycle polarized crystal 12 in difference frequency optical cavity again.During the generation of whole THz wave, difference frequency light can be with Energizing cycle polarized crystal 12 through cascaded optical parametric effect generation THz wave, and a pump photon can produce multiple Terahertz photons, effectively improve THz wave output energy and optical conversion efficiencies.
Description
Technical field
The present invention relates to a kind of terahertz emission source based on inner chamber optical parameter and beat effect, belong to THz wave skill
Art application field.
Background technology
Terahertz (Terahertz, abbreviation THz, 1THz=1012Hz) ripple refers to electricity of the frequency in the range of 0.1-10THz
Magnetic wave.The frequency range of THz ripples is in transitional region of the electronics to photonic propulsion, and in long wave direction, it has overlap with millimeter wave；
In shortwave direction, it has overlap with infrared ray.In frequency, THz ripples are in mistake of the macroscopic classical theories to Bcs Theory
Cross area.Because present position is special, THz ripples have broad application prospects：(1) THz photons have relatively low energy, are penetrated than X
The photon weak 10 of line7-108Times, will not in biological tissues cause light loss to injure photoionization；(2) many material macromoleculars, such as
The vibration of large biological molecule and speed are all in THz wave bands, so showing very strong absorption and resonance in THz frequency ranges；(3)
THz ripples are the electromagnetic wave with Quantum Properties, the penetration capacity with similar microwave, while also having the direction of similar light wave
Property；(4) typical pulse-widths of THz pulse are in subpicosecond magnitude, can to including liquid, semiconductor, superconductor, biological sample etc.
Interior various materials carry out the transient state spectral investigation of subpicosecond, femtosecond time resolution.
At present one of fast-developing major technology bottleneck of limitation THz wave technology be just a lack of high power, it is tunable,
Narrow linewidth, the coherent THz radiation source of room temperature operating.THz wave is produced based on optical parameter effect and optical difference frequency effect
Method have high power, high efficiency, tunable, narrow linewidth, room temperature operating etc. characteristic, but be currently based on optical parameter effect
Terahertz emission source with optical difference frequency effect mainly uses non-colinear phase matched mode, pump light, flashlight and ideler frequency light
It is spatially separated from, seriously limits three-wave interaction, the efficiency of the THz wave produced by pump light is very low, without height
Effect produces THz wave using pump light.And absorption of the nonlinear optical crystal to THz wave is larger, produced in crystal
THz wave by serious absorption, so the THz wave energy of output is severely limited.
The content of the invention
It is an object of the invention to provide a kind of terahertz emission source based on inner chamber optical parameter and beat effect, it is used to solve
THz wave output energy and the low problem of optical conversion efficiencies in certainly current terahertz emission source.
To achieve the above object, the solution of the present invention includes a kind of Terahertz based on inner chamber optical parameter and beat effect
Radiation source, including pump light source, pump light source include the first level crossing 1, KD for setting gradually*P crystal 2, polarizer 3, Nd:
YAG laser pump module 4, the second level crossing 14.Terahertz emission source is additionally included in Nd:YAG laser pump module 4 and
The first ktp crystal 9 and the 2nd KTP crystalline substances for producing difference frequency light set gradually in pump light light path between two level crossings 14
Body 10, period 1 polarized crystal 12；First ktp crystal 9 and the second ktp crystal 10 can be by vertical with pump light light path
The synchronous opposite rotation of axis, the first parabolic is respectively arranged with pump light light path at the two ends of period 1 polarized crystal 12
The paraboloidal mirror 13 of face mirror 11 and second；Polarized towards the period 1 brilliant in the concave surface of the first paraboloidal mirror 11 and the second paraboloidal mirror 13
Body 12.
Further, the first ktp crystal 9 is identical with the second ktp crystal 10 and is symmetrical arranged.
Further, in Nd:Set in pump light light path between the ktp crystal 9 of YAG laser pump module 4 and first
There is a harmonic wave mirror 8 for transmiting pump light.
Further, harmonic wave mirror 8 is additionally operable to reflect the difference frequency light.
Further, in Nd:Second is provided with pump light light path between YAG laser pump module 4 and harmonic wave mirror 8
Periodical poled crystal 6, the He of the 3rd paraboloidal mirror 5 is provided with pump light light path at the two ends of second round polarized crystal 6
4th paraboloidal mirror 7；The concave surface of the 3rd paraboloidal mirror 5 and the 4th paraboloidal mirror 7 is towards second round polarized crystal 6.
Further, each paraboloidal mirror opens an aperture with the point of intersection of pump light light path.
It is an object of the invention to provide a kind of terahertz emission source based on inner chamber optical parameter and beat effect, compared to
Existing terahertz emission source, with advantages below：
(1) fundamental frequency pump light Energizing cycle polarized crystal is utilized, it is conllinear to produce too by inner chamber cascaded optical parametric effect
Hertz wave a, pump photon can produce multiple Terahertz photons, improve THz wave optical conversion efficiencies.
(2) using difference frequency light λ 1 and the Energizing cycle polarized crystals of λ 2, THz wave, one are collinearly produced through optical difference frequency effect
Individual difference frequency photon λ 1 can produce multiple Terahertz photons, effectively improve THz wave optical conversion efficiencies.By being adjusted in synchronism
The light wave λ 1 and λ 2 of wavelength tuning are realized in the azimuth of double ktp crystals, such that it is able to realize the THz wave of wavelength tuning output.
(3) whole cascaded nonlinear optical process uses collinear phase matching, improves pump light, Stokes light and Terahertz
The interaction volume of ripple, effectively improves the optical conversion efficiencies of THz wave.Cascaded nonlinear optical process is all double humorous using inner chamber
Shake, the THz wave of preceding back-propagating can be obtained, effectively improve the utilization ratio of difference frequency light, and then improve THz wave output
Energy and conversion efficiency.
(4) simple structure of the present invention, cost is relatively low.Package unit only needs to a homemade pumping source, and two pieces common
Ktp crystal, periodical poled crystal and some optical mirror slips.
Brief description of the drawings
Fig. 1 is the structural representation of the specific embodiment of the invention one；
Fig. 2 is the structural representation of the specific embodiment of the invention two；
Fig. 3 is λ1, the polarization cycle length of periodical poled crystal 12, the relation schematic diagram of THz wave frequency three；
Fig. 4 is the relation schematic diagram of THz wave frequency and the polarization cycle length of periodical poled crystal 6.
Specific embodiment
The present invention will be further described in detail below in conjunction with the accompanying drawings.
A kind of terahertz emission source based on inner chamber optical parameter and beat effect, including pump light source, pump light source bag
Include the first level crossing 1, KD for setting gradually*P crystal 2, polarizer 3, Nd:YAG laser pump module 4, the second level crossing 14.
Terahertz emission source is additionally included in Nd:In pump light light path between the level crossing 14 of YAG laser pump module 4 and second successively
The first ktp crystal 9, the second ktp crystal 10, the period 1 polarized crystal 12 for setting；First ktp crystal 9 and the second ktp crystal
10 are used to produce difference frequency light, and the first ktp crystal 9 and the second ktp crystal 10 can be same by the axis vertical with pump light light path
Step is opposite to be rotated, and the first paraboloidal mirror 11 is respectively arranged with the two ends of period 1 polarized crystal 12 in pump light light path
With the second paraboloidal mirror 13；The concave surface of the first paraboloidal mirror 11 and the second paraboloidal mirror 13 is towards period 1 polarized crystal 12.
Based on above technical scheme, with reference to accompanying drawing, detailed description below is provided.
Implementation method one
The technical scheme is that a kind of terahertz emission source based on inner chamber optical parameter and beat effect is provided, such as
Shown in Fig. 1, including pump light source, pump light source is by level crossing 1, KD*P crystal 2, polarizer 3, Nd:YAG laser pumping
Module pump module 4, level crossing 14 are constituted.In Nd:In pump light light path after YAG laser pump module pump module 4
It is disposed with for transmiting pump light, the harmonic wave mirror 8 of reflected difference frequency light, ktp crystal 9, ktp crystal 10, periodical poled crystal
12, it is provided with paraboloidal mirror 11 and paraboloidal mirror 13, parabola at the two ends of periodical poled crystal 12 in pump light light path
The concave surface of mirror 11 and paraboloidal mirror 13 is towards periodical poled crystal 12.Above-mentioned all constituents are arranged on level crossing 1 and plane
Between mirror 14.
The orientation of present embodiment is set as shown in figure 1, pump light source is by level crossing 1,14, KD*P crystal 2, polarizer 3
And Nd:YAG laser pump module pump module 4 is constituted, and in the range of 10-1000mJ, repetition rate is in 1- for single pulse energy
In the range of 200Hz, pulsewidth is in the range of 1-100ns.Present embodiment uses electric-optically Q-switched pulse Nd:YAG laser pumping mould
Block, single pulse energy is 150mJ, and wavelength is 1064nm, and pulsewidth is 10ns, and repetition rate is 10Hz, a diameter of 2mm of pump light,
Polarization direction is along Z-direction.
Pump light source produces the pump light of 1064nm brilliant through the incident two pieces of identical ktp crystals 9 of harmonic wave mirror 8 and KTP
Body 10, using II type-Ⅱphase matching modes.Pumping light stimulus ktp crystal can obtain two beam difference frequency light λ near nearly degeneracy point1
And λ2.Ktp crystal 9 and ktp crystal 10 are symmetrically placed, i.e., ktp crystal 9 rotates 180 ° of orientation for obtaining ktp crystal 10 along Z axis,
It is positioned such that eliminating difference frequency light λ1And λ2Walking off in ktp crystal.Ktp crystal 9 and 10 is by vertical with pump light light path
Axis it is synchronous opposite rotate, by the azimuth for being adjusted in synchronism ktp crystal 9 and 10The difference frequency of tunable wave length can be obtained
Light λ1And λ2, λ1Wave-length coverage in 1.82-2.128 μm, λ2Wave-length coverage at 2.128-2.56 μm.Difference frequency light λ1And λ2By
Vibrated in the resonator of the composition of eyeglass 8 and 14 and amplified, Energizing cycle polarized crystal 12 produces Terahertz by optical difference frequency effect
Ripple, because two beam difference frequency lights vibrate back and forth in resonator, so being passed to forward direction after being produced in periodical poled crystal 12
The THz wave broadcast, couples through paraboloidal mirror 11 and 13 export respectively.Difference frequency light λ1And λ2Terahertz is produced through optical difference frequency effect
During ripple, light wave λ1Energy reduces, light wave λ2Energy is exaggerated, because a λ1Photon, a λ2Photon, a terahertz
Hereby the photon energy relation between the sub- three of the glistening light of waves is a λ1The energy of photon is equal to a λ2The energy of photon and one are too
Hertz wave photon energy sum, that is, consume a λ1Photon will produce a λ2Photon and a THz wave photon.Energy is put
Big light wave λ2Continue Energizing cycle polarized crystal 12, the THz wave and single order of back-propagating before being produced through optical parameter effect
Stokes light, and first Stokes light can produce the THz wave and second order of preceding back-propagating through Second-Order effect
Stokes light, such cascade process can continue always, a λ1Photon can produce multiple Terahertz photons, and generation is too
Hertz wave is all coupled by paraboloidal mirror 11 and 13 and exported, and effectively improves THz wave energy and optical conversion efficiencies.It is whole at this
During, the light wave λ of wavelength tuning can be realized by the azimuth for being adjusted in synchronism ktp crystal 9 and ktp crystal 101And λ2, from
And the THz wave of tunable wave length output can be realized.
As shown in figure 3, working as λ1Wavelength in 2.05-2.125 μ ms, the polarization cycle of periodical poled crystal 12 is in 8.1-
During 2527 μ m, THz wave of the scope in 0.4-10.7THz can be obtained.λ in the present embodiment1Wavelength is 2113nm, λ2Ripple
A length of 2143.2nm, correspondingly the polarization cycle of periodical poled crystal 12 is 487 μm, can produce the Terahertz that frequency is 2THz
Ripple.
Implementation method two
As shown in Fig. 2 in Nd:Cycle pole is additionally provided between YAG laser pump module pump module 4 and harmonic wave mirror 8
Change crystal 6, paraboloidal mirror 5 and paraboloidal mirror 7, parabolic are provided with the two ends of periodical poled crystal 6 in pump light light path
The concave surface of face mirror 5 and paraboloidal mirror 7 is towards periodical poled crystal 6.The terahertz emission source remainder of present embodiment sets
Put identical with implementation method one.
The 1064nm pump light Energizing cycles polarized crystal 6 sent by pump light source, terahertz is produced through optical parametric oscillator
Hereby ripple and first Stokes light.Because first Stokes light and pump wavelength are very close to produced from periodical poled crystal 6
Rank Stokes light can vibrate as pump light in the resonator being made up of eyeglass 1 and 14, so this optical parameter process is
The conllinear double resonance in inner chamber, can produce along the rear THz wave to propagated forward, respectively through paraboloidal mirror 5 and 7 in crystal 6
Coupling output.First Stokes light continues Energizing cycle polarized crystal 6, to biography before and after being produced through Second-Order effect
The THz wave and second Stokes broadcast, the THz wave of generation are coupled through paraboloidal mirror 5 and 7 and exported.Second Stokes
With first Stokes optical wavelength very close to, it is also possible to vibrated in resonator, continued before Energizing cycle polarized crystal 6 can produce
The THz wave of back-propagating and three rank Stokes light, similarly three rank Stokes light also can be higher by the generation of optical parameter effect
The Stokes light of rank, parametric process can be sustained.So by cascaded optical parametric effect, pump photon can be with
Multiple Terahertz photons are produced, Terahertz output energy and optical conversion efficiencies are effectively improved.
Fig. 4 simulates THz wave frequency and the polarization cycle length of periodical poled crystal 6 when pumping wavelength is 1064nm
Relation, can be drawn from figure by change the polarization cycle length of periodical poled crystal 6 can obtain frequency tuning export
THz wave.The polarization cycle of periodical poled crystal 6 is 526 μm, can produce the THz wave that frequency is 2THz.
The remaining pump light projected after reaction generation THz wave in periodical poled crystal 6 is through the incidence two of harmonic wave mirror 8
The identical ktp crystal 9 of block and ktp crystal 10, using II type-Ⅱphase matching modes.Pumping light stimulus ktp crystal can be obtained
Two beam difference frequency light λ near to nearly degeneracy point1And λ2.Ktp crystal 9 and ktp crystal 10 are symmetrically placed, i.e., ktp crystal 9 revolves along Z axis
Turn 180 ° of orientation for obtaining ktp crystal 10, it is positioned such that eliminating difference frequency light λ1And λ2Walking off in ktp crystal.KTP is brilliant
Body 9 and 10 is rotated in opposite directions by synchronous with the axis that pump light light path is vertical, by the orientation for being adjusted in synchronism ktp crystal 9 and 10
AngleThe difference frequency light λ of tunable wave length can be obtained1And λ2, λ1Wave-length coverage in 1.82-2.128 μm, λ2Wave-length coverage exist
2.128-2.56μm.Difference frequency light λ1And λ2Vibrated in the resonator being made up of eyeglass 8 and 14 and amplified, Energizing cycle polarized crystal
12, THz wave is produced by optical difference frequency effect, because two beam difference frequency lights vibrate back and forth in resonator, so in cycle pole
The THz wave of backward and propagated forward can be produced in change crystal 12, is coupled through paraboloidal mirror 11 and 13 export respectively.Difference frequency light
λ1And λ2During THz wave being produced through optical difference frequency effect, light wave λ1Energy reduces, light wave λ2Energy is exaggerated, because
One λ1Photon, a λ2Photon energy relation between photon, a THz wave photon three is a λ1The energy of photon
Amount is equal to a λ2The energy of photon and a THz wave photon energy sum, that is, consume a λ1Photon will produce one
λ2Photon and a THz wave photon.The light wave λ that energy amplifies2Continue Energizing cycle polarized crystal 12, through optical parameter effect
The THz wave and first Stokes light of back-propagating before producing, and first Stokes light can be through Second-Order effect
The THz wave and second Stokes of back-propagating before producing, such cascade process can continue always, a λ1Photon
Multiple Terahertz photons, the THz wave of generation can be produced all to be coupled by paraboloidal mirror 11 and 13 and exported, effectively improve terahertz
Hereby wave energy and optical conversion efficiencies.In this whole process, by the azimuth for being adjusted in synchronism ktp crystal 9 and ktp crystal 10
The light wave λ of wavelength tuning can be realized1And λ2, such that it is able to realize the THz wave of tunable wave length output.
Present embodiment can simultaneously produce THz wave by periodical poled crystal 6 and 12, increased THz wave
Power, improves the utilization rate and optical conversion efficiencies of pump light.
The periodical poled crystal that two above implementation method is used is PPGaP crystal, is formed by stacking by 5 GaP chips, phase
Adjacent GaP chips form the second nonlinear optic constant array with positive and negative periodic reversal, and wafer thickness is equal to the relevant of crystal
Length is the half in Crystal polarization cycle.The wafer thickness of PPGaP crystal 6 is that the half of polarization cycle is 263 μm, wafer size
It is 263 μm of (X) × 20mm (Y) × 20mm (Z).The wafer thickness of PPGaP crystal 12 is that the half of polarization cycle is 243.5 μm,
Wafer size is 243.5 μm of (X) × 20mm (Y) × 20mm (Z), and pump light and two beam difference frequency lights are along GaP crystal<110>Direction is
X-direction is propagated.
The size of the ktp crystal 9 and 10 for using is 20mm (X-axis) × 8mm (Y-axis) × 8mm (Z axis), and cutting angle θ is equal to
49.5 °,Equal to 0 °.
The level crossing 1 of use and the 14 pairs of 1064nm light are high anti-, and harmonic wave mirror 8 is high to 1064nm, harmonic wave mirror 8 and level crossing 14
It is high to 1800-2500nm light anti-.
The paraboloidal mirror 5 and 7 of use is positioned over the both sides of crystal 6, and an aperture, hole diameter are opened in the center of paraboloidal mirror 5 and 7
It is 2mm, is only capable of by pump light.Paraboloidal mirror 11 and 13 is positioned over the both sides of crystal 12, and the center of paraboloidal mirror 11 and 13 opens one
Aperture, hole diameter is 2mm, is only capable of by pump light and two beam difference frequency lights.
Specific embodiment is presented above, but the present invention is not limited to described implementation method.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 teaching of the invention
The model of shape, formula, parameter simultaneously need not spend creative work.It is right without departing from the principles and spirit of the present invention
Change, modification, replacement and the modification that implementation method is carried out are still fallen within protection scope of the present invention.
Claims (4)
1. a kind of terahertz emission source based on inner chamber optical parameter and beat effect, including pump light source, pump light source includes
The first level crossing (1), the KD for setting gradually*P crystal (2), polarizer (3), Nd:It is YAG laser pump module (4), second flat
Face mirror (14)；Characterized in that, the terahertz emission source is additionally included in Nd:YAG laser pump module (4) and the second plane
The first ktp crystal (9) and the second ktp crystal for producing difference frequency light set gradually in pump light light path between mirror (14)
(10), period 1 polarized crystal (12)；First ktp crystal (9) and the second ktp crystal (10) can by with pump light
The synchronous opposite rotation of the vertical axis of light path, sets respectively in pump light light path at period 1 polarized crystal (12) two ends
It is equipped with the first paraboloidal mirror (11) and the second paraboloidal mirror (13)；First paraboloidal mirror (11) and the second paraboloidal mirror (13)
Concave surface towards period 1 polarized crystal (12)；In Nd:Between YAG laser pump module (4) and the first ktp crystal (9)
Pump light light path on be provided with one for transmiting the harmonic wave mirror (8) of pump light；In Nd:YAG laser pump module (4) with
Second round polarized crystal (6) is provided with pump light light path between harmonic wave mirror (8), near second week in pump light light path
The 3rd paraboloidal mirror (5) and the 4th paraboloidal mirror (7) are provided with phase polarized crystal (6) two ends；3rd paraboloidal mirror (5)
With the concave surface of the 4th paraboloidal mirror (7) towards second round polarized crystal (6).
2. the terahertz emission source based on inner chamber optical parameter and beat effect according to claim 1, it is characterised in that
First ktp crystal (9) is identical with the second ktp crystal (10) and is symmetrical arranged.
3. the terahertz emission source based on inner chamber optical parameter and beat effect according to claim 1, it is characterised in that
The harmonic wave mirror (8) is additionally operable to reflect the difference frequency light.
4. the terahertz emission source based on inner chamber optical parameter and beat effect according to claim 1, it is characterised in that
Each paraboloidal mirror opens an aperture with the point of intersection of pump light light path.
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| CN106159642B (en) * | 2016-09-13 | 2019-01-29 | 华北水利水电大学 | A kind of optical difference frequency terahertz radiation source of biparting shape crystal structure |
| CN106374323B (en) * | 2016-11-25 | 2023-05-05 | 中国科学院上海技术物理研究所 | Laser up-conversion terahertz difference frequency source detection system |
| CN110137780B (en) * | 2019-05-09 | 2021-02-26 | 华北水利水电大学 | Cascade terahertz wave parametric oscillator |
| CN112670796B (en) * | 2020-12-29 | 2023-03-21 | 华北水利水电大学 | Terahertz radiation source based on combination of resonant cavity and cascade difference frequency |
| CN112670801B (en) * | 2020-12-29 | 2023-05-02 | 华北水利水电大学 | Device for generating optical comb based on optimized cascade difference frequency |
| CN112670795A (en) * | 2020-12-29 | 2021-04-16 | 华北水利水电大学 | Multi-frequency terahertz radiation source based on waveguide |
| CN112670802B (en) * | 2020-12-29 | 2023-05-02 | 华北水利水电大学 | Device for generating middle infrared laser based on cascade optical difference frequency |
| CN114199813B (en) * | 2021-11-12 | 2022-12-23 | 中国科学院深圳先进技术研究院 | Terahertz on-chip integrated chip, control method thereof and on-chip integrated system |
| 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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