CN208806465U - A kind of nonlinear crystal based on multicycle structure obtains the device of THz source - Google Patents
A kind of nonlinear crystal based on multicycle structure obtains the device of THz source Download PDFInfo
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- CN208806465U CN208806465U CN201821371103.9U CN201821371103U CN208806465U CN 208806465 U CN208806465 U CN 208806465U CN 201821371103 U CN201821371103 U CN 201821371103U CN 208806465 U CN208806465 U CN 208806465U
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Abstract
The utility model provides a kind of device of nonlinear crystal acquisition THz source based on multicycle structure, it includes laser, for generating two beam infrared pump lights；Beam splitter and high reflection mirror, for keeping two beam high and low frequency pump lights conllinear；Filter plate, for making the tunable pump light of two beams become continuous sinusoidal light wave；Optical resonator includes the nonlinear crystal and high-reflecting film of multicycle structure in optical resonator, the physical process of Terahertz is generated for realizing collinear phase matching cascade difference frequency.The utility model utilizes polarization cycle, effective nonlinear coefficient under crystalline phase matching condition, and nonlinear crystal three couple waves interaction length is equal to periodic structure crystal length, increases transfer efficiency.
Description
Technical field
The utility model relates to Terahertz Technology fields, and in particular to obtain the device of THz source.
Background technique
Terahertz (Terahertz, THz, 1THz=1012THz) radiation refers generally to 30-3000 μm of wavelength (frequency 0.1-
10THz) the electromagnetic wave of range, the wave band are the electromagnetic wave bands not yet developed completely with very big scientific research value.
THz radiation the basic fields such as physics, chemistry, astronomy, molecular spectrum, life science and medical science and medical imaging,
The Applied research fields such as environmental monitoring, material tests, food inspection, radio astronomy, mobile communication, satellite communication and military radar
There are great scientific research value and wide application prospect.Under general scenario, microwave electron technology frequency is lower than 200GHz, light
Sub- technology frequency is higher than 10THz, this makes THz radiation source become the key and bottleneck that THz technology develops.Therefore, how to develop
The THz radiation source of function admirable has become researcher practical problem urgently to be resolved out.
THz radiation source as future application powerful have received widespread attention, be THz technology most critical field it
One；Obtain high efficiency (energy) THz radiation source, it has also become the key of THz technology and its application field.It is produced in many relevant THz
In raw electronics and optical means, nonlinear difference frequency generation generates (difference frequency generation, DFG)
It is tunable with width, inexpensive, compact-sized, at room temperature steady running, the characteristics such as be easily achieved, be gradually researcher
Favor.In DFG, by second nonlinear interaction process to generate THz radiation.In nonlinear optical conversion, crystal is inhaled
Receipts cause difference frequency conversion quantum efficiency low, select nonlinear crystal to be considered as following factors: broadband range pump light；THz wave
Section absorption coefficient is small；Nonlinear factor is big；Broadband phase matched；Easy growing large-size, high quality crystal；Light injury threshold
It is high；Preferable physicochemical characteristics；Suitable for processing, plated film etc..There are MgO:LN, PPLN etc. 3-5 mu m waveband is the most frequently used, period knot
Structure PPLN crystal is at low cost, and domestic growing technology is very mature, reaches advanced world standards, high-gain, without escaping etc. it is excellent
Point is widely used in continuous and high repetition DFG infrared light supply system.
In order to improve low quantum efficiency, Manley-Rowe be overcome to limit, cascade difference frequency is a kind of effective ways.Work as input
When pumping light power 1MW, compared to difference frequency process, in the case of wavelength 1mm, THz exports peak power and improves nearly 8 times.
THz radiation is to interact to generate between two incident lights, and in cascade DFG, high and low frequency mid-infrared laser beam is in nonlinear optical
It learns interaction in medium and generates different frequency light, cascade DFG process consumes high frequency pump light ωmAnd amplify low frequency pump light
ωm+1, ω laterm+1Continue to pump as high frequency, it amplifies THz radiation and generates lower frequencies omegam+2.In cascade DFG process
In, the interaction of stokes light will generate THz radiation.Meanwhile anti-Stokes light can also consume THz radiation.From a left side to
The right side is Stokes interaction (generation of THz wave), is anti-Stokes interaction from right to left (THz wave exhausts).Si Tuo
The interaction of Ke Si light is better than anti-Stokes light, finally enhances THz radiation.High and low pump light is generated based on same PPLN
And terahertz light, strong terahertz generation that PPLN is compact-sized and nonlinear factor increases.Establish being total to based on Nd:YAG laser
Line quasi-phase matched model, pump light, Terahertz frequency are greater than 1THz, and the absorption coefficient of PPLN crystal is rapid with frequency increase
Increase, Terahertz output be reduced rapidly, therefore pump light, Terahertz frequency be lower than 1THz when can effectively improve terahertz generation
Efficiency.According to Manley-Rowe relationship, the transfer efficiency for cascading difference frequency process depends primarily on periodic structure under Terahertz frequency
The polarization cycle of nonlinear crystal and absorption, the method based on periodic structure PPLN Cascaded crystals difference frequency by Stokes and it is anti-this
Lentor process mutually determines that conversion quantum efficiency is more than 100%, breaks through Manley-Rowe limitation.
Summary of the invention
To solve the problems, such as to mention in background technique, the utility model provides a kind of non-linear crystalline substance based on multicycle structure
Body obtains the device of THz source, and the apparatus structure is simple.
Difference frequency is limited by many factors, and major defect is that transfer efficiency is low, these factors are divided into two classes: nonlinear dielectric
Characteristic and quantum defect.High and low pump light and terahertz light are generated based on same PPLN, and PPLN is compact-sized and nonlinear factor
The strong terahertz that increases generates.According to Manley-Rowe relationship, difference frequency maximum conversion efficiency is lower than 1%.Two methods can be used
To overcome difference frequency to limit: being based on cascade process or longer polarization cycle.Based on above-mentioned, it is proposed that waveguiding structure cascade is poor
Frequency generates Terahertz scheme.
A kind of nonlinear crystal based on multicycle structure of the utility model obtains the device of THz source, comprising:
Laser, for generating two beam infrared pump lights；
Beam splitter and high reflection mirror, for keeping two beam high and low frequency pump lights conllinear；
Filter plate, for making the tunable pump light of two beams become continuous sinusoidal light wave；
Optical resonator includes the nonlinear crystal and high-reflecting film of multicycle structure in optical resonator, for realizing altogether
Phase of line matching cascade difference frequency generates the physical process of Terahertz.
Further, laser includes first laser device and second laser, and beam splitter setting is sent out in second laser
In the optical path of low frequency pump light (second laser) out；High reflection mirror includes the first high reflection mirror, the second high reflection mirror, third height
The high frequency pump light (first laser) that first laser device is issued is arranged in reflecting mirror and the 4th high reflection mirror, the first high reflection mirror
Optical path on, and be configured to for first laser being reflected on beam splitter；Beam splitter is configured to transmission first laser device and is issued
High frequency pump light (first laser), the low frequency pump light (second laser) that is issued of reflected second laser device, and make first
The low frequency pump light (second laser) that the high frequency pump light (first laser) and second laser that laser is issued are issued is altogether
Line；Second high reflection mirror, third high reflection mirror and the 4th high reflection mirror are configured to the tunable pumping that two beams are conllinear
Light is reflected on filter plate；Filter plate includes the first filter plate, the second filter plate, third filter plate, the 4th filter plate and the 5th
Filter plate, five filter plates are arranged to successively transmit the sinusoidal light in the conllinear infrared pump light of two beams
Wave；Optical resonator is arranged in the optical path of the conllinear infrared pump light of two beams, and the conllinear infrared pump light of two beams exists
The intracavitary physical process realized collinear phase matching cascade difference frequency and generate Terahertz of optical resonance.
Further, the nonlinear crystal of multicycle structure is multicycle structure PPLN crystal.
Further, absorber is equipped with by filter plate, the veiling glare reflected for absorbing part by these filter plates.
Further, first laser device and second laser are Nd:YAG laser.
Content according to the present utility model realizes Terahertz output according to following operating procedure:
Step 1 generates two beam infrared pump lights, the wavelength model of two beam infrared pump lights using tunable Nd:YAG laser
Enclose 0.213 μm~1.064 μm and frequency phase-difference 1THz；
Step 2 keeps two beam infrared pump lights conllinear；
Multicycle structure PPLN crystal is placed in pump beam optical path by step 3, and the polarization cycle of the nonlinear crystal connects
Continuous variation, nonlinear crystal are fabricated to multicycle structure using returing cycle, effective nonlinear system under crystalline phase matching condition
Number, nonlinear crystal three couple waves interaction length are equal to periodic structure crystal length；
Step 4, variation Nd:YAG laser pumping optical wavelength, continuous translation periodic structure crystal is to change the polarization of crystal
Period realizes the tunable output of Terahertz.
The utility model establishes the conllinear quasi-phase matched model based on Nd:YAG laser, pump light, Terahertz frequency
Greater than 1THz, the absorption coefficient of PPLN crystal increases with frequency and is increased sharply, and Terahertz output is reduced rapidly, therefore pump light,
Terahertz frequency can effectively improve terahertz generation efficiency when being lower than 1THz.The transfer efficiency of cascade difference frequency process mainly takes
The certainly polarization cycle in Terahertz frequency lower period structural nonlinear crystal and absorption, it is poor based on periodic structure PPLN Cascaded crystals
The method of frequency is mutually determined that conversion quantum efficiency is more than 100% by Stokes and anti-Stokes process, breaks through Manley-
Rowe limitation.
The utility model is exported tunable pump light using two Nd:YAG lasers and is cascaded based on multicycle structure crystal
Difference frequency, translation change the polarization cycle of periodic structure nonlinear crystal, realize tunable output.The utility model has excellent under it
Point:
(1) it realizes that tunable Terahertz exports using two Nd:YAG lasers, is changed by translation cycle structure crystal
Polarization cycle length obtains wide scope THz source.
(2) using periodic structure maximum Crystal polarization period, maximum effective nonlinear coefficient, transfer efficiency is proportional to pumping
Square of optical power, effective nonlinear coefficient and three couple waves interaction length obtains high efficiency THz source.
(3) high and low pump light and terahertz light are generated based on same PPLN, PPLN is compact-sized and nonlinear factor increases
Strong terahertz generates.
(4) the conllinear quasi-phase matched model based on Nd:YAG laser is established, pump light, Terahertz frequency are greater than
The absorption coefficient of 1THz, PPLN crystal increases with frequency and is increased sharply, and Terahertz output is reduced rapidly, therefore pump light, terahertz
Terahertz generation efficiency can be effectively improved when hereby frequency is lower than 1THz.
(5) transfer efficiency for cascading difference frequency process depends primarily on the pole of Terahertz frequency lower period structural nonlinear crystal
Change the period and absorption, the method based on periodic structure PPLN Cascaded crystals difference frequency are mutual by Stokes and anti-Stokes process
It determines, conversion quantum efficiency is more than 100%, breaks through Manley-Rowe limitation.
(6) THz source that tunable technology based on the utility model generates, can be widely applied to high-speed radiocommunication,
The fields such as nondestructive evaluation and medical diagnosis.
Detailed description of the invention
Fig. 1 is the reality that the nonlinear crystal based on multicycle structure of the utility model obtains the device of THz source
Apply the structural schematic diagram of example.
Fig. 2 is the schematic illustration of the Nd:YAG laser device of the utility model.
Fig. 3 is the structural schematic diagram of the multicycle structure PPLN crystal of the utility model.
Fig. 4 is the principle signal that the collinear phase matching cascade difference frequency of the utility model generates the physical process of Terahertz
Figure.
Fig. 5 is the polarization cycle of the utility model with the variation relation figure of pump wavelength.
Fig. 6 is the wave vector amount of mismatch of the utility model with the variation relation figure of pumping light frequency.
Fig. 7 is the wave vector amount of mismatch of the utility model with the partial enlarged view of pumping light frequency variation relation.
1- first laser device in the figure, the first high reflection mirror of 2-, 3- second laser, 4- beam splitter, the second high reflection of 5-
Mirror, 6- third high reflection mirror, the 4th high reflection mirror of 7-, the first filter plate of 8-, the second filter plate of 9-, 10- third filter plate, 11-
4th filter plate, the 5th filter plate of 12-, 13- absorber, 14- high-reflecting film, 15- nonlinear crystal, 16- optical resonator, 17-
Terahertz lens, 18-Golay detector.
Specific embodiment
The utility model is described in more detail below by embodiment, following embodiment is only illustrative, the utility model guarantor
Shield range is not limited by these embodiments.
The device that THz source is obtained using the nonlinear crystal as shown in Figure 1 based on multicycle structure, utilizes Nd:
YAG laser model generates tunable Terahertz device based on multicycle structure PPLN Cascaded crystals difference frequency.As shown in Figure 1,
High and low two beams pump light, two beams are generated using two Nd:YAG lasers (labeled as first laser device 1 and second laser 3)
0.213 μm to 1.064 μm, pump energy 100mJ of tunable pump wavelength range, by changing outside Nd:YAG laser chamber
The angulation change wavelength of grating.The first high reflection mirror 2 is placed in the left side of first laser device 1, and the left side of second laser 3, which is placed, to be divided
Beam mirror 4, also, the high frequency pump light (first laser) for issuing the first high reflection mirror 2 reflection first laser device 1 arrives beam splitter 4
On, the low frequency pump light (second laser) for issuing 4 reflected second laser device 3 of beam splitter, first laser is through beam splitter 4 and the
Dual-laser is conllinear.Conllinear first laser and second laser (conllinear light) are irradiated on the second high reflection mirror 5, are re-reflected into
On three high reflection mirrors 6, finally it is reflected on the 4th high reflection mirror 7；The position of third high reflection mirror 6 is more than the 4th high reflection mirror 7
It is low, it is reflected into conllinear fairing benefit on the 4th high reflection mirror 7 and is reflected by the 4th high reflection mirror 7.It is reflected by the 4th high reflection mirror 7
Conllinear light sequentially pass through the first filter plate 8, the second filter plate 9, third filter plate 10, the 4th filter plate 11 and the 5th filter plate
12, into optical resonator 16.First filter plate 8, the second filter plate 9, third filter plate 10, the 4th filter plate 11 and the 5th filter
Absorber 13 is equipped with by wave plate 12, the veiling glare reflected for absorbing part by these filter plates.It is equipped in optical resonator 16 more
Two pieces of high-reflecting films 14 of periodic structure PPLN crystal 15 and left and right, conllinear light realize collinear phase matching grade in optical resonator 16
Join the physical process that difference frequency generates Terahertz.The Terahertz of generation is concentrated through Terahertz lens 17, passes through Golay detector 18
It is detected.
Operation material is the periodic structure nonlinear crystal of calculating cycle, as being multicycle structure PPLN crystalline substance in the present embodiment
Body.Multicycle PPLN crystal refers to that the crystal of multiple and different polarization cycles (0.25 μm, 0.5 μm, 1 μm etc.) is horizontally arranged in one piece of crystalline substance
On body, Fig. 3 is the structural schematic diagram of multicycle structure PPLN crystal.By variation Crystal polarization period or control temperature to output
Wavelength is tuned, and multicycle structure PPLN crystal can be placed on controllable translation platform, by translating controllable translation platform,
Period of the consecutive variations based on the incident conllinear light of periodic structure nonlinear crystal, the conllinear light of two beams are generated by the effect of PPLN crystal
Terahertz.
The utility model is based on high and low two beams pump light and is based on multicycle structure crystal cascade difference frequency generation Terahertz.This
In the process, in order to realize that cascade process effectively exports, high and low pump light and terahertz light meet the quasi- phase of three couple waves process
Matching condition.The physics mistake of Terahertz is generated based on the collinear phase matching cascade difference frequency of multicycle polarization nonlinear crystal structure
Journey such as Fig. 4.The present embodiment uses first-order quasi-phase-matching, and multicycle structure crystal is PPLN crystal.Based on the cascade quasi- phase of difference frequency
Position matching condition such as formula (1), (2), (3), in conllinear quasi-phase matched, the wave of 3 formula calculating cycle structure PPLN crystal of simultaneous
Swear amount of mismatch, polarization cycle such as formula (4), (5):
km-km+1-kT=kΛ (2)
λm、λm+1And λTIt is high and low pump light (ω respectivelym、ωm+1) and Terahertz (ωT) wavelength, km=2 π nm/λm,
km+1=2 π nm+1/λm+1It is the wave vector of two beam pump lights, kT=2 π nT/λTIt is the wave vector of Terahertz, kΛ=2 π/λΛIt is periodic structure
The reciprocal lattice vector of crystal, nm、nm+1And nTIt is the refractive index of two beam pump lights and Terahertz respectively.Terahertz output is by adjusting pumping
Optical wavelength, by (3), (4) formula it is found that wavelength change polarization cycle changes therewith, the period consecutive variations of periodic structure crystal.Cause
This, exports the high and low pump light collinear incident of two beams to periodic structure crystal using Nd:YAG laser, i.e., acquisition high efficiency, can
Tune Terahertz.Difference frequency is limited by many factors, and major defect is that transfer efficiency is low, these factors are divided into two classes: non-linear
Dielectric property and quantum defect.High and low pump light is generated based on same PPLN and terahertz light, PPLN are compact-sized and non-thread
Property coefficient increase strong terahertz generation.Establish the conllinear quasi-phase matched model of Nd:YAG laser, pump light, Terahertz frequency
Greater than 1THz, the absorption coefficient of PPLN crystal increases with frequency and is increased sharply, and Terahertz output is reduced rapidly, therefore pump light,
Terahertz frequency can effectively improve terahertz generation efficiency when being lower than 1THz.According to Manley-Rowe relationship, difference frequency is most
Big transfer efficiency is lower than 1%.Two methods can be used to overcome difference frequency to limit: based on cascade process or longer polarization week
Phase.Based on above-mentioned, it is proposed that waveguiding structure cascade difference frequency generates Terahertz scheme, the model include Stokes and it is anti-this
The interaction of lentor light.It is brilliant that the transfer efficiency of cascade difference frequency process depends primarily on Terahertz frequency lower period structural nonlinear
The polarization cycle of body and absorption, the method based on periodic structure PPLN Cascaded crystals difference frequency is by Stokes and anti-Stokes mistake
Journey mutually determines that conversion quantum efficiency is more than 100%, breaks through Manley-Rowe limitation.
Fig. 4 is cascade process schematic diagram.Single order difference frequency process, high and low frequency pump light and Terahertz pass through standard in PPLN
Phase matched interaction generates Terahertz and improves by longer polarization cycle and high pump power to realize cascading
Difference frequency generates the efficiency of Terahertz, carries out theory analysis to Terahertz process is generated based on PPLN cascade difference frequency.
Fig. 5,6 are the embodiment situation, and pump wavelength, 0.213 μm to 1.064 μm of frequency, 281.955THz are arrived
1408.451THz generates the polarization length of Terahertz and the wave vector mismatch of Terahertz by changing pump wavelength (frequency)
Measure curve graph.0.5THz, 1THz theory tune PPLN Crystal polarization cycle length from 7.103mm, 3.581mm consecutive variations to
3712mm, 1558mm, Fig. 4 can be seen that be tuned as nonlinear crystal is translated to polarization cycle augment direction, generates Terahertz
It is tuned along wavelength augment direction.0.5THz, 1THz theory tune PPLN crystal wave vector amount of mismatch from -98.496 cm-1、-
196.797cm-1Consecutive variations are to 9034cm-1、17925cm-1, Fig. 5 can be seen that low frequency pump light tuning range is wide, and wave vector is lost
The variation range matched is small to be made to generate Terahertz decaying slowly, and Terahertz output tuning is big.
The utility model proposes utilize Nd:YAG laser-based by the translation period of change structural nonlinear Crystal polarization period
In the method that cascade difference frequency generates tunable Terahertz, crystalline substance is changed by continuous translation periodic structure nonlinear crystal on platform
The body period is to meet quasi-phase matched condition to obtain tunable THz source.The present embodiment not only overcomes infrared laser difference frequency brilliant
The major defect that bulk damage threshold value is low, terahertz wave band absorption coefficient is big also can produce more high conversion efficiency Terahertz.The implementation
The distinguishing features such as example tool room temperature operates, compact-sized and installation and debugging are simple.The utility model obtains THz source in high speed nothing
The fields such as line communication, nondestructive evaluation and medical diagnosis show broad prospect of application.
It needs exist for illustrating, the utility model is unfolded to be described in detail centered on embodiment.It is practical composition, construction and
The variation of details of use all should belong within the scope of the utility model.
Claims (5)
1. the device that a kind of nonlinear crystal based on multicycle structure obtains THz source, characterized in that include:
Laser, for generating two beam infrared pump lights；
Beam splitter and high reflection mirror, for keeping two beam high and low frequency pump lights conllinear；
Filter plate, for making the tunable pump light of two beams become continuous sinusoidal light wave；
Optical resonator includes the nonlinear crystal and high-reflecting film of multicycle structure in optical resonator, for realizing conllinear phase
Position matching cascade difference frequency generates the physical process of Terahertz.
2. the apparatus according to claim 1, it is characterized in that: laser includes first laser device and second laser, beam splitting
Mirror is arranged in the optical path for the low frequency pump light that second laser is issued；High reflection mirror includes the first high reflection mirror, second high
The high frequency pump that first laser device is issued is arranged in reflecting mirror, third high reflection mirror and the 4th high reflection mirror, the first high reflection mirror
In the optical path of Pu light, and it is configured to for first laser being reflected on beam splitter；Beam splitter is configured to transmission first laser device institute
The low frequency pump light that high frequency pump light, the reflected second laser device of sending are issued, and the height for issuing first laser device
The low frequency pump light that frequency pump light and second laser are issued is conllinear；Second high reflection mirror, third high reflection mirror and the 4th are high
Mirror arrangement is conllinear for the low frequency pump light that the high frequency pump light and second laser that are issued first laser device are issued
Light beam afterwards is reflected on filter plate；Filter plate includes the first filter plate, the second filter plate, third filter plate, the 4th filter plate
With the 5th filter plate, five filter plates are arranged to successively transmit in the conllinear infrared pump light of two beams just
String light wave；Optical resonator is arranged in the optical path of the conllinear infrared pump light of two beams, the conllinear infrared pumping of two beams
Light is in the intracavitary physical process realized collinear phase matching cascade difference frequency and generate Terahertz of optical resonance.
3. the apparatus according to claim 1, it is characterized in that: the nonlinear crystal of multicycle structure is multicycle structure PPLN
Crystal.
4. the apparatus according to claim 1, it is characterized in that: being equipped with absorber by filter plate.
5. the apparatus of claim 2, it is characterized in that: first laser device and second laser are Nd:YAG laser
Device.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113948944A (en) * | 2021-10-15 | 2022-01-18 | 复旦大学 | Method for generating coherent terahertz pulse based on resonance four-wave mixing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113948944A (en) * | 2021-10-15 | 2022-01-18 | 复旦大学 | Method for generating coherent terahertz pulse based on resonance four-wave mixing |
| CN113948944B (en) * | 2021-10-15 | 2024-04-09 | 复旦大学 | Method for generating coherent terahertz pulse based on resonance four-wave mixing |
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