CN103811990B - Terahertz parameter source and application thereof on the basis of potassium titanium oxide arsenate crystals - Google Patents
Terahertz parameter source and application thereof on the basis of potassium titanium oxide arsenate crystals Download PDFInfo
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- CN103811990B CN103811990B CN201410064072.2A CN201410064072A CN103811990B CN 103811990 B CN103811990 B CN 103811990B CN 201410064072 A CN201410064072 A CN 201410064072A CN 103811990 B CN103811990 B CN 103811990B
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Abstract
Disclosed is a terahertz parameter source on the basis of potassium titanium oxide arsenate crystals. The terahertz parameter source comprises a laser pumping system, a terahertz parametric device and a cooling system, wherein the terahertz parametric device comprises the potassium titanium oxide arsenate crystals, pumped laser emitted by the laser pumping system illuminates along the terahertz parametric device, and the terahertz parameter source is formed by scattering process of stimulated excitons of the potassium titanium oxide arsenate crystals. The output frequency range of terahertz waves is from 3.5THz to 6.5THz. The terahertz parametric device further comprises a rear cavity mirror and an output mirror, and the laser pumping system emits the laser sequentially along the rear cavity mirror of the terahertz parametric device, the potassium titanium oxide arsenate crystals and the output mirror of the terahertz parametric device. According to the terahertz parameter source and the application thereof on the basis of the potassium titanium oxide arsenate crystals, nonlinear crystals of potassium titanium oxide arsenate are used, the nonlinearity gain of the crystals is high, meanwhile, high damage threshold is achieved, and tunable terahertz radiation waves in the frequency range from 3.5THz to 6.5THz can be obtained through an angle tuning mode.
Description
Technical field
The present invention relates to a kind of Terahertz parameter source based on arsenic acid titanyl potassium crystal and application thereof, belong to Terahertz
The technical field in parameter source.
Background technology
Be excited exciton scattering be a kind of important technology producing terahertz emission, by the exciton of being excited of some crystal
Scattering can obtain visible, near-infrared, and the tunable laser of terahertz wave band.Terahertz with other technologies
Hereby source, the THz source such as optical rectification, QCL and electricity is compared, this based on being excited to swash
The Terahertz parameter source of son scattering have can encapsulate integrated, working and room temperature, easy to use, be easy to tuning, live width
The advantage such as narrow.Terahertz parameter source is always one of Terahertz study hotspot producing field.The most the most now
There are the report in a large number about Terahertz parameter source, the crystal LiNbO that they all utilize3Or MgO:LiNbO3Make
For the working media of non-linear conversion, tunable terahertz emission in 0.6-3THz frequency range can be obtained
Source.The minimum A1 symmetric vibration mould of arsenic acid titanyl potassium crystal is 233.8cm-1, this vibration mould has red simultaneously
Outer and Raman active, by angle tuning can obtain in 3.5THz to 6.5THz frequency range adjustable
Humorous terahertz emission source, extends based on LiNbO3The Terahertz frequency range in the Terahertz parameter source of crystal,
The most do not find the Terahertz parameter source realized with this crystal.
Summary of the invention
The present invention provides a kind of Terahertz parameter source based on arsenic acid titanyl potassium crystal.The present invention utilizes arsenic acid titanyl
Potassium crystal be excited exciton scattering process constitute Terahertz parameter source.
The present invention also provides for the application in above-mentioned Terahertz parameter source based on arsenic acid titanyl potassium crystal.This Terahertz is joined
Amount source is the output of tunable THz wave in achieving 3.5-6.5THz frequency range.
Technical scheme is as follows:
A kind of Terahertz parameter source based on arsenic acid titanyl potassium crystal, including laser pump (ing) system, Terahertz parameter
Device and cooling system；Described Terahertz parametric device includes arsenic acid titanyl potassium crystal, described laser pump (ing) system
Send pumping laser to irradiate along Terahertz parametric device, described arsenic acid titanyl potassium crystal be excited exciton scattering process
The Terahertz parameter source constituted.
According to currently preferred, the THz wave reference frequency output in described Terahertz parameter source is
3.5-6.5THz。
According to currently preferred, described Terahertz parametric device also include Terahertz parametric device Effect of Back-Cavity Mirror,
The outgoing mirror of Terahertz parametric device, the laser that described laser pump (ing) system sends is along after Terahertz parametric device
The outgoing mirror of chamber mirror, arsenic acid titanyl potassium crystal and Terahertz parametric device penetrates successively.
According to currently preferred, described arsenic acid titanyl potassium crystal is nonlinear crystal arsenic acid titanyl potassium.By laser
The laser beam that pumping system produces nonlinear crystal arsenic acid titanyl potassium in Terahertz parametric device, described non-
Linear crystal arsenic acid titanyl potassium has Raman and infrared active and vibrates mould, produces and is excited exciton scattering, produces non-thread
Property parametric process, change pump light by angle turntable in described Terahertz parametric device and incide arsenic acid
Angle in titanyl potassium, can obtain the tunable Terahertz parameter in 3.5THz to 6.5THz frequency range
Source.
According to currently preferred, the cut direction of the crystal of described nonlinear crystal arsenic acid titanyl potassium
θ=90 °, φ is arbitrarily angled, and described θ is the angle of pumping laser and nonlinear crystal z-axis, and φ is
Nonlinear crystal x-axis and the angle of nonlinear crystal side, a length of l of nonlinear crystal, nonlinear crystal
Width be d.
According to currently preferred, cut direction such as Fig. 1 of the crystal of described nonlinear crystal arsenic acid titanyl potassium
Shown in, x, y, z represent the x-axis of arsenic acid titanyl potassium crystal, y-axis and z-axis direction, Terahertz outgoing respectively
The cutting angle φ of the crystal x-axis of face and nonlinear crystal arsenic acid titanyl potassium1In the range of-45 ° to-15 °.
Incident pump laser and the Stokes light being excited in exciton scattering process to produce occur on Terahertz exit facet entirely
Reflection, and THz wave can vertically or be bordering on be perpendicular to this surface export, crystal length is l, and width is
D, thickness is that the size of h, l and d meets l+d/tan φ1<-d/tanφ1< l, the width d of crystal and thickness
H can select according to pump spot size.
According to currently preferred, the both ends of the surface of described nonlinear crystal arsenic acid titanyl potassium are all coated with anti-reflection film.
The wave-length coverage of anti-reflection film can determine according to the wavelength of the pumping source selected；Polish at THz wave exit facet
Process.
According to currently preferred, the Effect of Back-Cavity Mirror of described Terahertz parametric device is coated with at Stokes wave band
High-reflecting film.The plated film making the outgoing mirror of described Terahertz parametric device has certain saturating at Stokes wave band
Cross rate.
According to currently preferred, the cut direction of the crystal of described nonlinear crystal arsenic acid titanyl potassium
θ=90 °, the span of φ is-10 ° to+10 °, and described θ is pumping laser and nonlinear crystal z-axis
Angle, φ is the angle of nonlinear crystal x-axis and nonlinear crystal side, a length of l of nonlinear crystal,
The width of nonlinear crystal is d；Thickness is h, crystal length l, width d, and thickness h can be according to the actual requirements
Select with the area of pumping laser hot spot.
Described Terahertz parametric device also includes THz wave coupling unit, described THz wave coupling unit
Silicon materials prisms, described silicon materials prism and nonlinear crystal xz face seamless contact.The number of prism
Amount and size can determine according to the size of nonlinear crystal.
According to currently preferred, the both ends of the surface of described nonlinear crystal arsenic acid titanyl potassium, i.e. yz all plates in face
There is anti-reflection film；Polishing is done at THz wave exit facet (xz face).The wave-length coverage of described anti-reflection film can
Wavelength according to the pumping source selected determines.
According to currently preferred, the Effect of Back-Cavity Mirror of described Terahertz parametric device is coated with at Stokes wave band
High-reflecting film.The plated film of the outgoing mirror of described Terahertz parametric device has certain passing through at Stokes wave band
Rate.
According to currently preferred, described laser pump (ing) system is the continuous laser system of LD pumping, quasi-continuous
Repetition rate be the low heavy of the pulse laser system of 100Hz-100kHz, flash lamp pumping or LD pumping
The laser system of the 1-100Hz of frequency；Described laser pump (ing) system provides in arsenic acid titanyl potassium nonlinear crystal
Power density be not less than 10MW/cm2；Described cooling system is circulating water cooling system or semiconductor refrigerating
System.Described circulating water crystal on side face all encases with the metal derby with pipeline, the pipeline of metal derby
The most persistently it is connected with recirculated cooling water, is used for reducing temperature to crystal；Described semiconductor refrigerating crystal on side face quilt
Semiconductor refrigerating block surrounds.
The method of work in a kind of Terahertz parameter source based on arsenic acid titanyl potassium crystal is as follows:
The arsenic acid titanyl potassium that the pump light that laser pump (ing) origin system sends enters into described Terahertz parametric device is non-
In linear crystal, in arsenic acid titanyl potassium crystal, there is Raman and infrared-active crystal vibration mould phase interaction simultaneously
With, produce be excited exciton scattering, in Terahertz parametric device formed Stokes laser, produce terahertz simultaneously
Hereby radiated wave, and utilize silicon prism-coupled array coupled modes or obtain too by the way of vertical surface is launched
Hertzion radiation exports.
Present invention have an advantage that
A kind of Terahertz parameter source based on arsenic acid titanyl potassium crystal of the present invention, employs a kind of new non-
Linear crystal arsenic acid titanyl potassium, this crystal non-linear gain is higher, has high damage threshold simultaneously, passes through angle
The mode of degree tuning can obtain the tunable terahertz emission ripple in 3.5THz to 6.5THz frequency range.
Accompanying drawing explanation
Fig. 1 is the cut direction schematic diagram of the crystal of heretofore described nonlinear crystal arsenic acid titanyl potassium；
Fig. 2 is the light in the arsenic acid titanyl potassium Terahertz parameter source being the exocoel pumping of the present invention, vertical surface transmitting
Line structure schematic diagram；
The exocoel pumping of Fig. 3 present invention, vertical surface launch arsenic acid titanyl potassium Terahertz parameter source in non-linear
The overall dimensions of crystal arsenic acid titanyl potassium；
Fig. 4 is the exocoel pumping of the present invention, the arsenic acid titanyl potassium Terahertz parameter source of silicon prism array coupling output
Light channel structure schematic diagram；
Fig. 5 be the q-operation of LD end pumping of the present invention, inner chamber pumping, silicon prism array coupling defeated
The light channel structure schematic diagram in Terahertz parameter source that go out, based on arsenic acid titanyl potassium crystal；
Fig. 6 be the q-operation of LD profile pump of the present invention, inner chamber pumping, vertical surface launch arsenic
The light channel structure schematic diagram in acid titanyl potassium Terahertz parameter source；
Fig. 7 is exocoel pumping of the present invention, the arsenic acid titanyl potassium Terahertz parameter source of silicon prism array coupling output
Light channel structure schematic diagram；
Wherein: 1. laser pumped by pulsed laser source, 2. device, 3. half-wave plate, 4. Terahertz are restrainted in beam expander or contracting
The Effect of Back-Cavity Mirror of parametric device, 5. the nonlinear crystal arsenic acid titanyl potassium of Terahertz parametric device, 6. Terahertz ginseng
The outgoing mirror of metering device, 7, angle turntable, 8. Terahertz silicon prism-coupled parts, 9. laser diode
LD, 10. optical fiber, 11. coupled lens groups, 12. pumped laser system resonator cavity Effect of Back-Cavity Mirror, 13. cooling perseverances
Temperature system, 14. gain mediums, 15. Q-switch, 16. polarizers, 17. pumped laser systems are humorous
Shake chamber outgoing mirror, 18.LD side pumping module.
Detailed description of the invention
Now for Figure of description and embodiment, the present invention is described in detail, but is not limited to this.
Embodiment 1,
A kind of Terahertz parameter source based on arsenic acid titanyl potassium crystal, including laser pump (ing) system, Terahertz parameter
Device and cooling system；Described Terahertz parametric device includes arsenic acid titanyl potassium crystal, described laser pump (ing) system
Send pumping laser to irradiate along Terahertz parametric device, described arsenic acid titanyl potassium crystal be excited exciton scattering process
The Terahertz parameter source constituted.
The THz wave reference frequency output in described Terahertz parameter source is 3.5-6.5THz.
Described Terahertz parametric device also include the Effect of Back-Cavity Mirror of Terahertz parametric device, Terahertz parametric device defeated
Appearance, the laser that described laser pump (ing) system sends is brilliant along Effect of Back-Cavity Mirror, the arsenic acid titanyl potassium of Terahertz parametric device
The outgoing mirror of body and Terahertz parametric device penetrates successively.
Described arsenic acid titanyl potassium crystal is nonlinear crystal arsenic acid titanyl potassium.The laser produced by laser pump (ing) system
Bundle nonlinear crystal arsenic acid titanyl potassium in Terahertz parametric device, described nonlinear crystal arsenic acid titanyl potassium
There is Raman and infrared active and vibrate mould, produce and be excited exciton scattering, produce non-linear parameter process, by institute
Angle turntable in the Terahertz parametric device stated changes pump light and incides the angle in arsenic acid titanyl potassium, can
Obtain the tunable Terahertz parameter source in 3.5THz to 6.5THz frequency range.
Cut direction θ=90 ° of the crystal of described nonlinear crystal arsenic acid titanyl potassium, φ is arbitrarily angled, institute
Stating the angle that θ is pumping laser and nonlinear crystal z-axis, φ is nonlinear crystal x-axis and nonlinear crystal
The angle of side, a length of l of nonlinear crystal, the width of nonlinear crystal is d.
The cut direction of the crystal of described nonlinear crystal arsenic acid titanyl potassium is as it is shown in figure 1, x, and y, z distinguish table
Show the x-axis of arsenic acid titanyl potassium crystal, y-axis and z-axis direction, Terahertz exit facet and nonlinear crystal arsenic acid titanium
The cutting angle φ of the crystal x-axis of oxygen potassium1In the range of-45 ° to-15 °.Incident pump laser and be excited to swash
The Stokes light produced in sub-scattering process is totally reflected on Terahertz exit facet, and THz wave is permissible
Vertical or be bordering on and be perpendicular to the output of this surface, crystal length is l, and width is d, and thickness is h, l and d
Size meets l+d/tan φ1<-d/tanφ1< l, the width d of crystal and thickness h can be according to pump spot sizes
Select.
The both ends of the surface of described nonlinear crystal arsenic acid titanyl potassium are all coated with anti-reflection film.The wave-length coverage of anti-reflection film can
Wavelength according to the pumping source selected determines；Polishing is done at THz wave exit facet.
The Effect of Back-Cavity Mirror of described Terahertz parametric device is coated with the high-reflecting film at Stokes wave band.Make described too
The plated film of the outgoing mirror of hertz parametric device has certain transmitance at Stokes wave band.
2 pairs of the present embodiment are described in detail below in conjunction with the accompanying drawings: as in figure 2 it is shown, one is based on arsenic acid titanyl
The Terahertz parameter source of potassium crystal includes laser pumped by pulsed laser source 1, beam expander or contracting bundle device 2, half-wave plate 3
The polarization state adjusting pumping laser is parallel with the z-axis of nonlinear crystal arsenic acid titanyl potassium 5, Terahertz parametric device
Effect of Back-Cavity Mirror 4 and Terahertz parametric device outgoing mirror 6 constitute the resonator cavity of tera-hertz parametric oscillator, and and non-thread
Property crystal arsenic acid titanyl potassium 5 be jointly fixed on angle turntable 7, constitute Terahertz parametric device；Pulse swashs
Optical pumping source 1, beam expander or contracting bundle device 2 and half-wave plate 3 collectively constitute the pumping source in Terahertz parameter source
System.
The method of work in a kind of Terahertz parameter source based on arsenic acid titanyl potassium crystal is as follows: laser pumped by pulsed laser source
1 laser sent adjusts laser facula size by beam expander or contracting bundle device 2, is then adjusted by half-wave plate 8
Enter after whole polarization state in Terahertz parametric device, owing to the A1 of arsenic acid titanyl potassium crystal therein vibrates mould
233.8cm-1 has Raman and an infrared active simultaneously, thus can produce and be excited exciton scattering, produces Stokes
Light, occurs the position of total reflection to produce Terahertz output at Stokes simultaneously.Arsenic acid titanyl potassium crystal 5 conduct
Nonlinear dielectric, can effectively be produced Stokes and Terahertz conversion, be changed by anglec of rotation turntable
Become the incident angle of incident illumination, i.e. pump light and Stokes light angle, θ outside arsenic acid titanyl potassium crystalext, can
With the tunable Terahertz output in the range of acquisition 3.5-6.5THz.
The described Nd:YAG adjusting Q pulse laser that laser pumped by pulsed laser source 1 is flash lamp pumping or LD pumping,
Wavelength is 1064.2nm, and repetition rate is 1-100Hz adjustable ns level pulse laser, maximum pumping energy
Amount is 1J, and pulse width is 8ns.
Described nonlinear crystal arsenic acid titanyl potassium 5, the cutting method of described nonlinear crystal as it is shown on figure 3, x,
Y, z are the x-axis of crystal, y-axis, z-axis direction, cut direction θ=90 °, φ=-30 °, and described θ is
Pumping laser and the angle of nonlinear crystal z-axis, φ is nonlinear crystal x-axis and nonlinear crystal side
Angle, nonlinear crystal is along a length of l=30mm of x-axis, along a length of d=15mm of y-axis, along
The thickness of z-axis is 8mm, and the size cut direction of described nonlinear crystal is not limited to this, and φ can be to appoint
Meaning angle, the size of crystal can be as desired to determine.
The both ends of the surface of described nonlinear crystal arsenic acid titanyl potassium 5 are all coated with 1000nm-1100nm wavelength
Anti-reflection film, side polishes.
The frequency of the terahertz emission ripple of described Terahertz parameter source output is tunable, by adjusting pumping
Light and Stokes laser exiting angle range outside nonlinear crystal are 1.7-6.9 °, to obtain tuning range
For 3.5-6.5THz.Described Stokes laser be excited in exciton scattering process to produce with pump light frequency
Close light beam.
The Effect of Back-Cavity Mirror 4 of described Terahertz parametric device is coated with anti-reflection film and the 1000nm-of pump light wave band
The high-reflecting film of 1100nm wave band；Outgoing mirror 5 is coated with transmittance at 1000-1100nm wave band.Herein
Described high-reflecting film, its reflectance is more than 95%, and transmittance scope described herein is 0.01%～99.99%.
Described cooling system is that circulating water crystal on side face all encases with the metal derby with pipeline, gold
Persistently it is connected with recirculated cooling water in belonging to the pipeline of block, is used for reducing temperature to crystal.
Workflow: the 1064.2nm laser that Nd:YAG adjusting Q pulse laser pumping source 1 sends passes through beam expander
Or it is 2.5mm that contracting bundle device 2 adjusts laser spot diameter, then adjusts laser polarization state by half-wave plate 8
It is parallel to the z-axis of arsenic acid titanyl potassium crystal, enters in Terahertz parametric device, due to arsenic acid titanyl potassium crystal
A1 vibration mould 233.8cm-1 has Raman and an infrared active simultaneously, thus can produce and be excited exciton scattering, produces
Stokes light near raw 1080nm, occurs the position of total reflection to produce Terahertz output at Stokes simultaneously.
Arsenic acid titanyl potassium crystal 5, as nonlinear dielectric, can effectively produce Stokes and Terahertz conversion, logical
Cross anglec of rotation turntable to change the incident angle of incident illumination, i.e. pump light with Stokes light at arsenic acid titanyl
Angle, θ outside potassium crystalext, it is possible to obtain the tunable Terahertz output in the range of 3.5-6.5THz.Work as pump
When Pu energy is 100mJ, it is thus achieved that maximum Terahertz output be about 627nJ.
Embodiment 2,
As shown in Figure 4.
A kind of Terahertz parameter source based on arsenic acid titanyl potassium crystal, including laser pump (ing) system, Terahertz parameter
Device and cooling system；Described Terahertz parametric device includes arsenic acid titanyl potassium crystal, described laser pump (ing) system
Send pumping laser to irradiate along Terahertz parametric device, described arsenic acid titanyl potassium crystal be excited exciton scattering process
The Terahertz parameter source constituted.
The THz wave reference frequency output in described Terahertz parameter source is 3.5-6.5THz.
Described Terahertz parametric device also includes the Effect of Back-Cavity Mirror of Terahertz parametric device, the outgoing mirror of Terahertz parametric device, institute
State laser that laser pump (ing) system sends Effect of Back-Cavity Mirror, arsenic acid titanyl potassium crystal and the Terahertz parametric device along Terahertz parametric device
Outgoing mirror penetrate successively.Described arsenic acid titanyl potassium crystal is nonlinear crystal arsenic acid titanyl potassium.
Cut direction θ=90 ° of the crystal of described nonlinear crystal arsenic acid titanyl potassium, the span of φ is
-10 ° to+10 °, described θ is the angle of pumping laser and nonlinear crystal z-axis, and φ is nonlinear crystal x
Axle and the angle of nonlinear crystal side, a length of l of nonlinear crystal, the width of nonlinear crystal is d；
Thickness is h, crystal length l, width d, and thickness h can be next with the area of pumping laser hot spot according to the actual requirements
Select.
Described Terahertz parametric device also includes THz wave coupling unit, described THz wave coupling unit
Silicon materials prisms, described silicon materials prism and nonlinear crystal xz face seamless contact.The number of prism
Amount and size can determine according to the size of nonlinear crystal.
The both ends of the surface of described nonlinear crystal arsenic acid titanyl potassium, i.e. yz face is all coated with anti-reflection film；At Terahertz
Ripple exit facet (xz face) does polishing.The wave-length coverage of described anti-reflection film can be according to the pumping source selected
Wavelength determines.
The Effect of Back-Cavity Mirror of described Terahertz parametric device is coated with the high-reflecting film at Stokes wave band.Described terahertz
Hereby the plated film of the outgoing mirror of parametric device has certain transmitance at Stokes wave band.
4 pairs of the present embodiment are described in detail below in conjunction with the accompanying drawings:
As shown in Figure 4, a kind of Terahertz parameter source based on arsenic acid titanyl potassium crystal includes laser pumped by pulsed laser source
The ns level pulse laser of the 1-100Hz of the low repetition of 1(flash lamp pumping or LD pumping), beam expander
Or contracting bundle device 2, half-wave plate 3 adjusts the polarization state of pumping laser and the z of nonlinear crystal arsenic acid titanyl potassium 5
Axle is parallel, and Effect of Back-Cavity Mirror 4 and the outgoing mirror 6 of Terahertz parametric device constitute the resonator cavity of Terahertz parametric device,
And jointly it is fixed on angle rotation with nonlinear crystal arsenic acid titanyl potassium 5 and Terahertz silicon prism-coupled parts 8
On platform 7, constitute Terahertz parametric device, nonlinear crystal arsenic acid titanyl potassium 5 and Terahertz silicon prism-coupled portion
The zox face intimate contact of part 8；Impulse optical pumping source 1, beam expander or contracting bundle device 2 and half-wave plate 3
Collectively constitute the pumping source system in Terahertz parameter source.A kind of Terahertz parameter source based on arsenic acid titanyl potassium crystal
Method of work as follows: the laser that laser pumped by pulsed laser source 1 sends by beam expander or contracting bundle device 2 adjust swash
Light spot size, enters Terahertz parametric device, due to arsenic acid titanium after then adjusting polarization state by half-wave plate 8
The A1 vibration mould 233.8cm-1 of oxygen potassium crystal has Raman and infrared active simultaneously, thus can produce and be excited to swash
Son scattering, produces Stokes light, produces terahertz emission ripple simultaneously, and defeated by silicon prism-coupled parts 8
Go out.Arsenic acid titanyl potassium crystal 5, as nonlinear dielectric, can effectively produce Stokes and Terahertz conversion,
The incident angle of incident illumination, i.e. pump light is changed with Stokes light at arsenic acid titanium by anglec of rotation turntable
Angle, θ outside oxygen potassium crystalext, it is possible to obtain the tunable Terahertz output in the range of 3.5-6.5THz.
The described Nd:YAG adjusting Q pulse laser that laser pumped by pulsed laser source 1 is flash lamp pumping or LD pumping,
Wavelength is 1064.2nm, and repetition rate is 1-100Hz adjustable ns level pulse laser, maximum pumping energy
Amount is 1J, and pulse width is 8ns.
Described nonlinear crystal arsenic acid titanyl potassium, cut direction θ=90 ° of described nonlinear crystal, φ=0 °,
Described θ is the angle of pumping laser and nonlinear crystal z-axis, and φ is nonlinear crystal x-axis and non-linear crystalline substance
The angle of body side surface, nonlinear crystal is along a length of l=30mm of x-axis, along a length of d=5mm of y-axis,
Thickness along z-axis is 5mm, and the size cut direction of described nonlinear crystal is not limited to this, crystal
Size can be as desired to determine.
The both ends of the surface of described nonlinear crystal arsenic acid titanyl potassium are all coated with the increasing of 1000nm-1100nm wavelength
Permeable membrane, side polishes.
The frequency of the terahertz emission ripple of described tera-hertz parametric oscillator output is tunable, by adjusting
Pump light and Stokes laser exiting angle range outside nonlinear crystal are 1.8-6.9 °, to obtain tuning
Scope is 3.5-6.5THz.Described Stokes laser be excited in exciton scattering process to produce with pumping optical frequency
The light beam that rate is close.
Described Effect of Back-Cavity Mirror 4 is coated with the anti-reflection film of pump light wave band and the high anti-of 1000nm-1100nm wave band
Film；Outgoing mirror 6 is coated with transmittance at 1000-1100nm wave band.High-reflecting film described herein, its reflection
Rate is more than 95%, and transmittance scope described herein is 0.01%～99.99%.
Described THz wave coupling unit 8 is the coupled modes of Terahertz silicon prism array.
Described cooling system is that circulating water crystal on side face all encases with the metal derby with pipeline, gold
Persistently it is connected with recirculated cooling water in belonging to the pipeline of block, is used for reducing temperature to crystal.
Workflow: the 1064.2nm laser that Nd:YAG adjusting Q pulse laser pumping source 1 sends passes through beam expander
Or it is 2.5mm that contracting bundle device 2 adjusts laser spot diameter, then adjusts laser polarization state by half-wave plate 8
It is parallel to the z-axis of arsenic acid titanyl potassium crystal, enters in Terahertz parametric device, due to arsenic acid titanyl potassium crystal
A1 vibration mould 233.8cm-1 has Raman and an infrared active simultaneously, thus can produce and be excited exciton scattering, produces
Stokes light near raw 1080nm, produces terahertz emission ripple simultaneously, and by Terahertz silicon prism battle array
Row 8 obtain output.Arsenic acid titanyl potassium crystal 5 as nonlinear dielectric, can effectively produce Stokes and
Terahertz is changed, and is changed the incident angle of incident illumination, i.e. pump light and Stokes by anglec of rotation turntable
Light angle, θ outside arsenic acid titanyl potassium crystalext, it is possible to obtain the tunable terahertz in the range of 3.5-6.5THz
Hereby export.
Embodiment 3,
As shown in Figure 6, a kind of Terahertz parameter source based on arsenic acid titanyl potassium crystal,
Wherein Terahertz parametric device by the Effect of Back-Cavity Mirror 4 of Terahertz parametric device, the outgoing mirror 6 of Terahertz parametric device,
Angle turntable 7, Terahertz coupling unit 8 silicon prism array and nonlinear crystal arsenic acid titanyl potassium 5 form,
Nonlinear crystal arsenic acid titanyl potassium 5 and the zox face intimate contact of Terahertz silicon prism-coupled parts 8, terahertz
The hereby Effect of Back-Cavity Mirror 4 of parametric device, nonlinear crystal arsenic acid titanyl potassium 5, the outgoing mirror 6 of Terahertz parametric device
It is fixed on angle turntable 7 together with Terahertz silicon prism-coupled parts 8；After pumped laser system resonator cavity
Chamber mirror 12, pumped laser system resonator cavity outgoing mirror 17 form pumping laser resonator cavity, pumping laser resonator cavity
In placement be followed successively by gain medium 14Nd:YAG laser crystal, acousto-optic Q modulation switch 15, the polarizer
16, half-wave plate 3 and Terahertz parametric device, collectively constitutes Terahertz parameter source based on arsenic acid titanyl potassium crystal.
The pumped laser system in Terahertz parameter source includes laser diode LD 9, optical fiber 10, coupled lens group 11,
Pumped laser system resonator cavity Effect of Back-Cavity Mirror 12 and the pumping laser of pumped laser system resonator cavity outgoing mirror 17 composition
The gain medium 14 being sequentially placed in resonator cavity and pumping laser resonator cavity is neodymium-doped yttrium-aluminum garnet
(Nd:YAG) laser crystal, Q-switch 15, the polarizer 16, half-wave plate 3 collectively constitute.A kind of based on
The Terahertz parameter source of arsenic acid titanyl potassium crystal is by above-mentioned pumped laser system and pumping laser resonator cavity
The Terahertz parametric device composition placed.The working method in Terahertz parameter source based on arsenic acid titanyl potassium crystal is such as
Under: the coupling pump light produced by LD end pumping system enters gain medium 14, produced fundamental frequency
Light enters into Terahertz parametric device, owing to the A1 oscillation mode of arsenic acid titanyl potassium crystal therein has red simultaneously
Outer and Raman effect, thus can produce and be excited exciton scattering, produce Stokes light and terahertz emission ripple, too
Hertz wave obtains output by Terahertz silicon prism-coupled parts 8.Above-mentioned Q-switch 15, laser gain are situated between
Matter 14 and nonlinear crystal arsenic acid titanyl potassium 5 all carry out temperature control by cooling constant temperature system 13, keep temperature
Degree is 20 DEG C.
Described laser diode LD 9 end face pumping system is to be the LD end pumping source near 808nm by wavelength
(peak power 75W) and corresponding optical fiber 14(core diameter 400 microns, numerical aperture 0.22) and coupling
Close battery of lens 15(1:1 imaging, operating distance 50mm) composition.
The size of described laser crystal Nd:YAG crystal 14 is φ 4mm × 5mm, and its doping content is 1-at.
Two end faces of % be all coated with 808nm and 1000nm-1100nm wavelength anti-reflection film (transmitance be more than 99.8
%).
Described Q-modulating device 15 is made up of radio frequency input equipment and acousto-optic adjusting Q crystal, the length of adjusting Q crystal
For 38mm, both ends of the surface are all coated with the anti-reflection film to 1000nm-1100nm wavelength, and (transmitance is more than 99.8
%)；Modulating frequency is that 1-60kHz is adjustable, is changed the density of adjusting Q crystal by input radio frequency ripple, realizes
The purpose of periodically-varied laserresonator threshold value, plays Q-switch effect.
The size of described arsenic acid titanyl potassium crystal 5 is 30 (x) × 5 (y) × 5 (z) mm3, both ends of the surface are all coated with 1000
The anti-reflection film (transmitance is more than 99.8%) of nm-1100nm wave band, zox plane polishing processes
Described resonant cavity mirror: the Effect of Back-Cavity Mirror 4 of Terahertz parametric device, the outgoing mirror of Terahertz parametric device
6, pumped laser system resonator cavity Effect of Back-Cavity Mirror 12, pumped laser system resonator cavity outgoing mirror 17 are all flat mirrors,
It is coated with the high-reflecting film (reflectance is more than 99.8%) of 1000nm-1100nm wavelength.
Workflow: LD sends the pump light of 808nm and enters neodymium-doped yttrium through optical fiber 10 and coupled lens group 11
Aluminium garnet Nd:YAG crystal 14, when acousto-optic Q modulation switch 15 closedown, pump light transfers reversion particle to and deposits
Storage is got up；When Q-switch 15 is opened, a large amount of reversion particles saved bit by bit transfer 1064.2 to by stimulated radiation moment
Nm fundamental frequency light；There is the fundamental frequency light of the high peak power arsenic acid titanyl potassium in Terahertz parametric device brilliant
During body, producing Stokes light and terahertz emission ripple owing to being excited the effect of exciton scattering, THz wave passes through
Terahertz silicon prism-coupled parts 8 obtain output, are changed the angle of incidence of incident illumination by anglec of rotation turntable
Degree, i.e. pump light and Stokes light angle, θ outside arsenic acid titanyl potassium crystalext, it is possible to obtain 3.5-6.5THz
In the range of tunable Terahertz output.
Embodiment 4,
As shown in Figure 6.Wherein Terahertz parametric device is by the Effect of Back-Cavity Mirror 4 of Terahertz parametric device, Terahertz ginseng
The outgoing mirror 6 of metering device, nonlinear crystal arsenic acid titanyl potassium 5, angle turntable 7 and cooling constant temperature system
13 compositions, the Effect of Back-Cavity Mirror 4 of Terahertz parametric device, nonlinear crystal arsenic acid titanyl potassium 5, Terahertz parametron
The outgoing mirror 6 of part is fixed on angle turntable 7 together with cooling constant temperature system 13；Pumped laser system is humorous
Chamber Effect of Back-Cavity Mirror 12 of shaking and pumped laser system resonator cavity outgoing mirror 17 form pumping laser resonator cavity, pumping laser
Placement in resonator cavity is followed successively by acousto-optic Q modulation switch 15, the polarizer 16, laser diode LD profile pump mould
Block 18, gain medium 14Nd:YAG laser crystal, half-wave plate 3 and above-mentioned Terahertz parametric device,
Collectively constitute Terahertz parameter source based on arsenic acid titanyl potassium crystal.The pumped laser system bag in Terahertz parameter source
Include chamber mirror 12,17, acousto-optic Q modulation switch 15, the polarizer 16, laser diode LD side pumping module 18,
Gain medium 14Nd:YAG laser crystal and half-wave plate 3 collectively constitute；A kind of brilliant based on arsenic acid titanyl potassium
The Terahertz parameter source of body is by the Terahertz placed in above-mentioned pumped laser system and pumping laser resonator cavity
Parametric device forms.The method of work in a kind of Terahertz parameter source based on arsenic acid titanyl potassium crystal is as follows: by
The 808nm coupling pump light that LD profile pump system produces enters gain medium 14, produced fundamental frequency
Light enters into Terahertz parametric device, owing to the A1 oscillation mode of arsenic acid titanyl potassium crystal therein has red simultaneously
Outer and Raman effect, thus can produce and be excited exciton scattering, produce Stokes light, occur at Stokes simultaneously
The position of total reflection produces Terahertz output.Arsenic acid titanyl potassium crystal 5, can be effective as nonlinear dielectric
Produce Stokes and Terahertz conversion, changed the incident angle of incident illumination, i.e. pump by anglec of rotation turntable
Pu light and Stokes light angle, θ outside arsenic acid titanyl potassium crystalext, it is possible to obtain in the range of 3.5-6.5THz
Tunable Terahertz output.Above-mentioned Q-switch 15, arsenic acid titanyl potassium crystal 5 are all by cooling constant temperature system
System 13 carries out temperature control, and keeping temperature is 20 DEG C.
Described laser diode LD side pumping module 18 is to be that the LD side near 808nm is pumped by wavelength
Shaven head (peak power 180W), driving power supply and water cooling box composition.
The size of described neodymium-doped yttrium-aluminum garnet Nd:YAG crystal 5 is Φ 3mm × 68mm, its doping content
For two end faces of 1-at.% be all coated with 1000nm-1100nm wave band anti-reflection film (transmitance be more than 99.8
%).
Described Q-modulating device 15 is made up of radio frequency input equipment and acousto-optic adjusting Q crystal, the length of adjusting Q crystal
For 46mm, both ends of the surface are all coated with the anti-reflection film to 1000nm-1100nm wave band, and (transmitance is more than 99.8
%)；Modulating frequency is that 1-50kHz is adjustable, is changed the density of adjusting Q crystal by input radio frequency ripple, realizes
The purpose of periodically-varied laserresonator threshold value, plays Q-switch effect.
Described arsenic acid titanyl potassium crystal 5 is identical with the nonlinear crystal arsenic acid titanyl potassium 5 in embodiment 1.
The Effect of Back-Cavity Mirror 4 of described Terahertz parametric device, the outgoing mirror 6 of Terahertz parametric device, pumping laser
System resonance chamber Effect of Back-Cavity Mirror 12, pumped laser system resonator cavity outgoing mirror 17 are all flat mirrors, are coated with 1000nm
The high-reflecting film (reflectance is more than 99.8%) of-1100nm wavelength.
Workflow: LD side pumping source sends the pump light of 808nm and incides neodymium-doped yttrium-aluminum garnet Nd:YAG
Crystal 14, when acousto-optic Q modulation switch 15 when closed, pump light transfers reversion particle to and stores；When Q opens
When pass 15 is opened, a large amount of reversion particles saved bit by bit transfer 1064.2nm fundamental frequency light to by stimulated radiation moment；
There is the fundamental frequency light of the high peak power arsenic acid titanyl potassium crystal in Terahertz parametric device, owing to being subject to
The effect swashing exciton scattering produces Stokes light, occurs the position of total reflection to produce Terahertz at Stokes simultaneously
Output, changes the incident angle of incident illumination, i.e. pump light with Stokes light at arsenic by anglec of rotation turntable
Angle, θ outside acid titanyl potassium crystalext, it is possible to obtain the tunable Terahertz output in the range of 3.5-6.5THz.
Embodiment 5,
A kind of Terahertz parameter source based on arsenic acid titanyl potassium crystal, its difference is,
Simply remove Q-switch 15, it is thus achieved that continuous print terahertz emission ripple operates.
Workflow: LD sends the pump light of 808nm and enters neodymium-doped yttrium through optical fiber 10 and coupled lens group 11
Aluminium garnet Nd:YAG crystal 14, transfers 1064.2nm fundamental frequency light to by stimulated radiation；Fundamental frequency light is through too
During arsenic acid titanyl potassium crystal in hertz parametric device, produce continuously run owing to being excited the effect of exciton scattering
Stokes light and terahertz emission ripple, THz wave obtains output by Terahertz silicon prism-coupled parts 8,
The incident angle of incident illumination, i.e. pump light is changed with Stokes light at arsenic acid titanium by anglec of rotation turntable
Angle, θ outside oxygen potassium crystalext, it is possible to obtain the tunable Terahertz output in the range of 3.5-6.5THz.
Embodiment 6,
A kind of Terahertz parameter source based on arsenic acid titanyl potassium crystal, its difference is,
Nonlinear crystal arsenic acid titanyl potassium 5 is with the nonlinear crystal arsenic acid titanyl potassium 5 in embodiment 2.
Embodiment 7,
As it is shown in fig. 7, a kind of Terahertz parameter source based on arsenic acid titanyl potassium crystal,
Including the 1(flash lamp pumping of laser pumped by pulsed laser source or the ns level of the 1-100Hz of the low repetition of LD pumping
Pulse laser), beam expander or contracting bundle device 2, half-wave plate 3 adjusts the polarization state of pumping laser with non-linear
The z-axis of crystal arsenic acid titanyl potassium 5 is parallel, nonlinear crystal arsenic acid titanyl potassium 5 and Terahertz silicon prism-coupled portion
Part 8 constitutes Terahertz parametric device, the nonlinear crystal arsenic acid titanyl potassium 5 of Terahertz parametric device and Terahertz
The zox face intimate contact of silicon prism-coupled parts 8；Laser pumped by pulsed laser source 1, beam expander or contracting bundle device
2 and half-wave plate 3 collectively constitute the pumping source system in Terahertz parameter source.A kind of based on arsenic acid titanyl potassium crystal
The method of work in Terahertz parameter source as follows: the laser that laser pumped by pulsed laser source 1 sends by beam expander or
Contracting bundle device 2 adjusts laser facula size, enters Terahertz parametron after then adjusting polarization state by half-wave plate 3
Part, has Raman and infrared active owing to the A1 of arsenic acid titanyl potassium crystal vibrates mould 233.8cm-1 simultaneously, because of
And can produce and be excited exciton scattering, produce Stokes light, produce terahertz emission ripple simultaneously, and pass through terahertz
Hereby silicon prism-coupled parts 8 export.Arsenic acid titanyl potassium crystal 5, as nonlinear dielectric, can effectively produce
Stokes and Terahertz conversion, it is possible to obtain the Terahertz output in the range of 3.5-6.5THz.
The described Nd:YAG adjusting Q pulse laser that laser pumped by pulsed laser source 1 is flash lamp pumping or LD pumping,
Wavelength is 1064.2nm, and repetition rate is 1-100Hz adjustable ns level pulse laser, maximum pumping energy
Amount is 1J, and pulse width is 8ns.
Described nonlinear crystal arsenic acid titanyl potassium, cut direction θ=90 ° of described nonlinear crystal, φ=0 °,
Described θ is the angle of pumping laser and nonlinear crystal z-axis, and φ is nonlinear crystal x-axis and non-linear crystalline substance
The angle of body side surface, nonlinear crystal is along a length of l=30mm of x-axis, along a length of d=5mm of y-axis,
Thickness along z-axis is 5mm, and the size cut direction of described nonlinear crystal is not limited to this, crystal
Size can be as desired to determine.
The both ends of the surface of described nonlinear crystal arsenic acid titanyl potassium are all coated with the increasing of 1000nm-1100nm wavelength
Permeable membrane, side polishes.
Described THz wave coupling unit 8 is the coupled modes of Terahertz silicon prism array.
Described cooling system is that circulating water crystal on side face all encases with the metal derby with pipeline, gold
Persistently it is connected with recirculated cooling water in belonging to the pipeline of block, is used for reducing temperature to crystal.
Workflow: the 1064.2nm laser that Nd:YAG adjusting Q pulse laser pumping source 1 sends passes through beam expander
Or it is 2.5mm that contracting bundle device 2 adjusts laser spot diameter, then adjusts laser polarization state by half-wave plate 8
It is parallel to the z-axis of arsenic acid titanyl potassium crystal, enters in Terahertz parametric device, due to arsenic acid titanyl potassium crystal
A1 vibration mould 233.8cm-1 has Raman and an infrared active simultaneously, thus can produce and be excited exciton scattering, produces
Stokes light near raw 1080nm, produces the terahertz emission ripple in the range of 3.5-6.5THz simultaneously,
And obtain output by Terahertz silicon prism-coupled parts 8.
Embodiment 8,
A kind of Terahertz parameter source based on arsenic acid titanyl potassium crystal, its difference is,
Nonlinear crystal arsenic acid titanyl potassium 5 is with the nonlinear crystal arsenic acid titanyl potassium 5 in embodiment 1.
Claims (9)
1. a Terahertz parameter source based on arsenic acid titanyl potassium crystal, it is characterised in that this parameter source includes
Laser pump (ing) system, Terahertz parametric device and cooling system；Described Terahertz parametric device includes arsenic acid titanyl
Potassium crystal, described laser pump (ing) system sends pumping laser and irradiates along Terahertz parametric device, described arsenic acid titanyl
Potassium crystal be excited exciton scattering process constitute Terahertz parameter source；
The THz wave reference frequency output in described Terahertz parameter source is 3.5-6.5THz.
A kind of Terahertz parameter source based on arsenic acid titanyl potassium crystal the most according to claim 1, it is special
Levying and be, described Terahertz parametric device also includes the Effect of Back-Cavity Mirror of Terahertz parametric device, Terahertz parametric device
Outgoing mirror, the laser that described laser pump (ing) system sends is along the Effect of Back-Cavity Mirror of Terahertz parametric device, arsenic acid titanyl
The outgoing mirror of potassium crystal and Terahertz parametric device penetrates successively.
A kind of Terahertz parameter source based on arsenic acid titanyl potassium crystal the most according to claim 1, it is special
Levying and be, described arsenic acid titanyl potassium crystal is nonlinear crystal arsenic acid titanyl potassium.
A kind of Terahertz parameter source based on arsenic acid titanyl potassium crystal the most according to claim 3, it is special
Levy and be, cut direction θ=90 ° of the crystal of described nonlinear crystal arsenic acid titanyl potassium, φ is arbitrarily angled,
Described θ is the angle of pumping laser and nonlinear crystal z-axis, and φ is nonlinear crystal x-axis and non-linear crystalline substance
The angle of body side surface, a length of l of nonlinear crystal, the width of nonlinear crystal is d.
A kind of Terahertz parameter source based on arsenic acid titanyl potassium crystal the most according to claim 3, it is special
Levying and be, x, y, z represent the x-axis of arsenic acid titanyl potassium crystal, y-axis and z-axis direction respectively, and Terahertz goes out
Penetrate the cutting angle φ in face and the crystal x-axis of nonlinear crystal arsenic acid titanyl potassium1In the range of-45 ° to-15
°。
A kind of Terahertz parameter source based on arsenic acid titanyl potassium crystal the most according to claim 3, it is special
Levying and be, the both ends of the surface of described nonlinear crystal arsenic acid titanyl potassium are all coated with anti-reflection film；Described Terahertz ginseng
The Effect of Back-Cavity Mirror of metering device is coated with the high-reflecting film at Stokes wave band.
A kind of Terahertz parameter source based on arsenic acid titanyl potassium crystal the most according to claim 3, its feature
It is, cut direction θ=90 ° of the crystal of described nonlinear crystal arsenic acid titanyl potassium, the span of φ
For-10 ° to+10 °, described θ is the angle of pumping laser and nonlinear crystal z-axis, and φ is nonlinear crystal
X-axis and the angle of nonlinear crystal side, a length of l of nonlinear crystal, the width of nonlinear crystal is d；
Described Terahertz parametric device also includes THz wave coupling unit, and described THz wave coupling unit is silicon
Material prism, described silicon materials prism and nonlinear crystal xz face seamless contact.
A kind of Terahertz parameter source based on arsenic acid titanyl potassium crystal the most according to claim 7, it is special
Levying and be, the both ends of the surface of described nonlinear crystal arsenic acid titanyl potassium, i.e. yz face is all coated with anti-reflection film；Too
Hertz wave exit facet xz does polishing in face；The Effect of Back-Cavity Mirror of described Terahertz parametric device is coated with at Stokes
The high-reflecting film of wave band.
9. the work side in a Terahertz parameter source based on arsenic acid titanyl potassium crystal as claimed in claim 1
Method, it is characterised in that:
The arsenic acid titanyl potassium that the pump light that laser pump (ing) origin system sends enters into described Terahertz parametric device is non-
In linear crystal, in arsenic acid titanyl potassium crystal, there is Raman and infrared-active crystal vibration mould phase interaction simultaneously
With, produce be excited exciton scattering, in Terahertz parametric device formed Stokes laser, produce terahertz simultaneously
Hereby radiated wave, and utilize silicon prism-coupled array coupled modes or obtain too by the way of vertical surface is launched
Hertzion radiation exports.
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| CN105048280B (en) * | 2015-08-06 | 2018-06-22 | 山东大学 | A kind of Stokes light source and its method of work and application based on arsenic acid titanyl potassium crystal |
| CN106099625A (en) * | 2016-08-26 | 2016-11-09 | 山东大学 | A kind of Terahertz based on arsenic acid titanyl rubidium crystal produces system and method for work thereof |
| CN106229796B (en) * | 2016-10-10 | 2018-10-30 | 华北水利水电大学 | A kind of terahertz radiation source based on optical frequency mixing effect |
| CA3057518A1 (en) * | 2017-03-24 | 2018-09-27 | Macquarie University | Improvements in terahertz lasers and terahertz extraction |
| CN110768093A (en) * | 2019-10-31 | 2020-02-07 | 郑州轻工业学院 | Terahertz wave parameter source frequency selection and frequency tuning method and device |
| CN110768088A (en) * | 2019-10-31 | 2020-02-07 | 郑州轻工业学院 | Tunable terahertz wave parameter source with self-frequency-selective seed laser injection |
| CN112086848B (en) * | 2020-09-17 | 2023-08-11 | 河南顺博新能源科技有限公司 | High-power intracavity pump terahertz wave parametric oscillator for outputting uniform divergence angle round light spots |
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