CN110086076A - A kind of wide spectrum optical parametric oscillator - Google Patents
A kind of wide spectrum optical parametric oscillator Download PDFInfo
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- CN110086076A CN110086076A CN201910386032.2A CN201910386032A CN110086076A CN 110086076 A CN110086076 A CN 110086076A CN 201910386032 A CN201910386032 A CN 201910386032A CN 110086076 A CN110086076 A CN 110086076A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 33
- 238000001228 spectrum Methods 0.000 title claims abstract description 24
- 239000013078 crystal Substances 0.000 claims abstract description 47
- 229910003327 LiNbO3 Inorganic materials 0.000 claims abstract description 42
- 230000005540 biological transmission Effects 0.000 claims abstract description 19
- 230000000694 effects Effects 0.000 claims abstract description 16
- 238000005086 pumping Methods 0.000 claims abstract description 15
- 238000004064 recycling Methods 0.000 claims abstract description 14
- 230000003321 amplification Effects 0.000 claims description 12
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 12
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- 239000000203 mixture Substances 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 238000000862 absorption spectrum Methods 0.000 description 2
- 238000005842 biochemical reaction Methods 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
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- 239000002360 explosive Substances 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
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- 230000000644 propagated effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/0813—Configuration of resonator
- H01S3/0816—Configuration of resonator having 4 reflectors, e.g. Z-shaped resonators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/1083—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering using parametric generation
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
- G02F1/392—Parametric amplification
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- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
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- General Physics & Mathematics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a kind of wide spectrum optical parametric oscillators, including pumping source, MgO:LiNbO3Crystal, pump light recycling box, Stokes light recycling box, and be arranged in MgO:LiNbO3Reflecting mirror around crystal；Incident 5th reflecting mirror of the N-1 grade Stokes light exported from resonant cavity, the N-1 grade Stokes light of transmission becomes the first N-1 grades of Stokes light, the N-1 grade Stokes light of reflection becomes the 2nd N-1 grades of Stokes light, the 2nd N-1 grades of Stokes light after the 6th reflecting mirror and the reflection of the 7th reflecting mirror withθ 2Angle incidence MgO:LiNbO3Crystal generates N grades of Stokes light and N grades of THz waves through optical parameter effect；Generate N beam Stokes light simultaneously in this way, N is integer and is greater than 1；The wavelength of N grades of Stokes light is greater than the wavelength of (N-1) grade Stokes light, and a branch of pump light generates wide spectrum Stokes light；By changing angleθ 1The angle andθ 2, the Stokes light at different levels of available broad tuning.Tuning manner is simple, flexible operation.
Description
Technical field
The invention belongs to THz wave applied technical fields, and in particular to a kind of wide spectrum optical parametric oscillator.
Background technique
THz wave (Terahertz, abbreviation THz) refers to frequency in 0.1-10THz (1THz=1012THz) in range
Electromagnetic wave, wave band are located in electromagnetic spectrum between millimeter wave and infrared ray, are photonics with electronics, macroscopic theory to microcosmic
Theoretical transitional region.Specific position locating for THz wave makes it in physics, chemistry, astronomy, molecular spectrum, life science
With basic research field and medical imaging, environmental monitoring, material tests, food inspection, radio astronomy, the shifting such as medical science
Before the Applied research fields such as dynamic communication, satellite communication and military radar have great scientific research value and wide application
Scape.THz wave is mainly used in following field:
(1) imaging field
Transient electromagnetic field caused by Terahertz electromagnetic pulse, Ke Yizhi can be directly measured using terahertz time-domain spectroscopic technology
Connect the dielectric constant for measuring sample.
(2) technological field of biochemistry
Since the rotation absorption spectra of many large biological molecules is in Terahertz frequency range, using to biochemical reaction Terahertz absorption spectra
Study the molecular motion condition information in available reaction.Strong means are provided for further studying biochemical reaction.
(3) astronomy field
In universe, a large amount of substance is issuing terahertz electromagnetic wave.Carbon (C), water (H2O), carbon monoxide (CO), nitrogen (N2)、
Oxygen (O2) etc. a large amount of molecule can be detected in Terahertz frequency range.
(4) communications field
THz wave is good wide-band-message carrier, can carry audio frequency or vision signal is transmitted.THz wave is used
The wireless transmission speed of 10GB/s can be obtained in communication, this several hundred to more than 1,000 times faster than current super-broadband tech.
(5) Homeland Security field
In Homeland Security field, unionized and strong penetrability due to THz wave, so it can be at airport, station etc.
Ground provides remote, large-scale early warning to dangerous goods such as hiding explosive, contraband, weapon, drugs.
What is lacked can generate high power, high quality, efficient THz wave, and low cost and can operate at room temperature
THz source be the main problem faced at present.The production method of THz wave mainly has electronics method and photonics at present
Method.Electronics method is that the wavelength of electromagnetic radiation is generally extended to terahertz wave band from millimeter wave, is also equivalent to one
The process that frequency becomes larger, but very big obstacle can be encountered when frequency is greater than 1THz, so that efficiency becomes very low, while electricity
The terahertz radiation source that sub- method generates is bulky, limits its application in many fields.And photonics method
Its Main way is exactly that visible light or infrared light are converted to terahertz wave band.The advantage of the method is the Terahertz generated
Radiation source has very high coherence and directionality, but the THz wave power and efficiency that generate at this stage are all lower.
Summary of the invention
The object of the present invention is to provide a kind of wide spectrum optical parametric oscillators, to solve existing THz wave power
The problems such as low, low efficiency.
The object of the present invention is achieved in the following manner:
A kind of wide spectrum optical parametric oscillator, including pumping source, MgO:LiNbO3Crystal, pump light recycling box, Stokes light
Recycling box, and be arranged in MgO:LiNbO3Reflecting mirror around crystal；
The pump light being emitted from pumping source is after the first reflecting mirror and the reflection of the second reflecting mirror with θ1Angle incidence MgO:LiNbO3It is brilliant
Body generates level-one Stokes light and level-one THz wave through optical parameter effect, level-one Stokes light by third reflecting mirror and
Amplification is vibrated in the resonant cavity of 4th reflecting mirror composition, and is partially exported from resonant cavity；From MgO:LiNbO3Crystal outgoing
Pump light is recycled by pump light recycling box；
Incident 5th reflecting mirror of the level-one Stokes light exported from resonant cavity, the level-one Stokes light of transmission become the first level-one
Stokes light, the level-one Stokes light of reflection become the second level-one Stokes light；Second level-one Stokes light is through the 6th reflecting mirror
With θ after being reflected with the 7th reflecting mirror2Angle incidence MgO:LiNbO3Crystal generates second level Stokes light and two through optical parameter effect
Grade THz wave；Second level Stokes light vibrates amplification in the resonant cavity being made of third reflecting mirror and the 4th reflecting mirror, and from
It is partially exported in resonant cavity；
Incident 5th reflecting mirror of the second level Stokes light exported from resonant cavity, the second level Stokes light of transmission become the first second level
Stokes light, the second level Stokes light of reflection become the second second level Stokes light, and the second second level Stokes light is through the 6th reflecting mirror
With θ after being reflected with the 7th reflecting mirror2Angle incidence MgO:LiNbO3Crystal generates three-level Stokes light and three through optical parameter effect
Grade THz wave；Three-level Stokes light vibrates amplification in the resonant cavity being made of third reflecting mirror and the 4th reflecting mirror, and from
It is partially exported in resonant cavity；
Incident 5th reflecting mirror of the three-level Stokes light exported from resonant cavity, the three-level Stokes light of transmission become the first three-level
Stokes light, the three-level Stokes light of reflection become the second three-level Stokes light, and the second three-level Stokes light is through the 6th reflecting mirror
With θ after being reflected with the 7th reflecting mirror2Angle incidence MgO:LiNbO3Crystal generates level Four Stokes light and four through optical parameter effect
Grade THz wave；Level Four Stokes light vibrates amplification in the resonant cavity being made of third reflecting mirror and the 4th reflecting mirror, and from
It is partially exported in resonant cavity；
……
Incident 5th reflecting mirror of the N-1 grade Stokes light exported from resonant cavity, the N-1 grade Stokes light of transmission become the first N-1
Grade Stokes light, the N-1 grade Stokes light of reflection become the 2nd N-1 grades of Stokes light, and the 2nd N-1 grades of Stokes light are anti-through the 6th
It penetrates after mirror and the reflection of the 7th reflecting mirror with θ2Angle incidence MgO:LiNbO3Crystal, through optical parameter effect generate N grade Stokes light with
N grades of THz waves；Generate N beam Stokes light simultaneously in this way, N is integer and is greater than 1；The wavelength of N grades of Stokes light is greater than (N-1)
The wavelength of grade Stokes light, a branch of pump light generate wide spectrum Stokes light；
The plane of beam propagation is plane determined by X-axis and Y-axis, and Z axis is emitted perpendicular to the plane of beam propagation from pumping source
The direction of propagation of pump light be that X-axis is positive, the direction of propagation of the second level-one Stokes light is Y-axis negative sense；
θ1For the angle of pump light and X-axis negative sense after the reflection of the second reflecting mirror, θ2It is incident after the reflection of the 7th reflecting mirror
MgO:LiNbO3The Stokes light of crystal and the angle of X-axis negative sense.
The pumping source uses pulse laser, wavelength 1064nm, repetition rate 10Hz, and single pulse energy is
100mJ, beam diameter 5mm, polarization direction are Z axis.
First reflecting mirror, the second reflecting mirror, third reflecting mirror, the 4th reflecting mirror, the 5th reflecting mirror, the 6th reflecting mirror
It is plane mirror with the 7th reflecting mirror, and adjustable angle.
The pumping light total reflection that first reflecting mirror and the second reflecting mirror are 1064nm to wavelength, third reflecting mirror, the
The Stokes light total reflections at different levels of six reflecting mirrors and the 7th reflecting mirror to wave-length coverage in 1064-2000nm, the 4th reflecting mirror pair
Wave-length coverage is 60% in the Stokes light transmission rates at different levels of 1064-2000nm, the biography of the 5th reflecting mirror and N-1 grades of Stokes light
The angle for broadcasting direction is 45 °, the 5th reflecting mirror to wave-length coverage 1064-2000nm Stokes light 50% at different levels reflection,
50% transmission.
The MgO:LiNbO3Crystal is cuboid, is rectangle in X-Y plane；MgO doping concentration is 5mol%, crystal
Optical axis along Z axis.
The MgO:LiNbO3Size X × Y × Z of crystal is 40mm × 30mm × 8mm.
The level-one Stokes light, second level Stokes light ... N grades of Stokes light by third reflecting mirror and the 4th reflect
Microscope group at resonant cavity in collinearly propagate.
The MgO:LiNbO3The level-one THz wave that is generated in crystal, second level THz wave ... N grades of THz waves are equal
It does not export.
From MgO:LiNbO3Second level-one Stokes light of crystal outgoing, the second second level Stokes light ... the 2nd N-1 grades
Stokes light is recycled by Stokes light recycling box.
Compared with the existing technology, the present invention is had the advantage that by a kind of wide spectrum optical parametric oscillator
(1) by changing angle θ1With angle θ2, the Stokes light at different levels of available broad tuning.Tuning manner is simple, flexible operation.
(2) (N-1) grade Stokes light can produce N grades of Stokes light, and Stokes light at different levels can be recycled.
Detailed description of the invention
Fig. 1 is the structure principle chart of the embodiment of the present invention.
Fig. 2 is MgO:LiNbO3Pump light, Stokes light and THz wave phase matched schematic diagram in crystal.K in figurep、
ks1、kT1The respectively wave vector of pump light, level-one Stokes light, level-one THz wave, ksN、ks(N+1)、kT(N+1)Respectively N grades
The wave vector of Stokes light, (N+1) grade Stokes light, (N+1) grade THz wave.θ1Angle is pump light wave vector kpWith level-one
Stokes light wave swears ks1Between angle, θ2Angle is that N grades of Stokes light waves swear ksNIt is sweared with (N+1) grade Stokes light wave
ks(N+1)Between angle.
Specific embodiment
The present invention will be further described in detail with reference to the accompanying drawing.
As shown in attached drawing 1-2, a kind of wide spectrum optical parametric oscillator, including pumping source 1, MgO:LiNbO3Crystal 5, pump
Pu light recycling box 9, Stokes light recycling box 16, and be arranged in MgO:LiNbO3Reflecting mirror around crystal 5；
The pump light 2 being emitted from pumping source 1 is after the first reflecting mirror 3 and the reflection of the second reflecting mirror 4 with θ1Angle incidence MgO:
LiNbO3Crystal 5 generates level-one Stokes light 6S1 through optical parameter effect and level-one THz wave, level-one Stokes light 6S1 exists
Amplification is vibrated in the resonant cavity for be made of third reflecting mirror 7 and the 4th reflecting mirror 8, and partially being exported from resonant cavity；From MgO:
LiNbO3The pump light 2 that crystal 5 is emitted is recycled by pump light recycling box 9；
Incident 5th reflecting mirror 13 of the level-one Stokes light 6S1 exported from resonant cavity, the level-one Stokes light 6S1 of transmission become the
One level-one Stokes light 6S11, the level-one Stokes light 6S1 of reflection become the second level-one Stokes light 6S12；Second level-one
Stokes light 6S12 is after the 6th reflecting mirror 14 and the reflection of the 7th reflecting mirror 15 with θ2Angle incidence MgO:LiNbO3Crystal 5, through optics
Parametric effect generates second level Stokes light 6S2 and second level THz wave；Second level Stokes light 6S2 is by third reflecting mirror 7 and
Amplification is vibrated in the resonant cavity of four reflecting mirrors 8 composition, and is partially exported from resonant cavity；
Incident 5th reflecting mirror 13 of the second level Stokes light 6S2 exported from resonant cavity, the second level Stokes light 6S2 of transmission become the
One second level Stokes light 6S21, the second level Stokes light 6S2 of reflection become the second second level Stokes light 6S22, the second second level
Stokes light 6S22 is after the 6th reflecting mirror 14 and the reflection of the 7th reflecting mirror 15 with θ2Angle incidence MgO:LiNbO3Crystal 5, through optics
Parametric effect generates three-level Stokes light 6S3 and three-level THz wave；Three-level Stokes light 6S3 is by third reflecting mirror 7 and
Amplification is vibrated in the resonant cavity of four reflecting mirrors 8 composition, and is partially exported from resonant cavity；
Incident 5th reflecting mirror 13 of the three-level Stokes light 6S3 exported from resonant cavity, the three-level Stokes light 6S3 of transmission become the
One three-level Stokes light 6S31, the three-level Stokes light 6S3 of reflection become the second three-level Stokes light 6S32, the second three-level
Stokes light 6S32 is after the 6th reflecting mirror 14 and the reflection of the 7th reflecting mirror 15 with θ2Angle incidence MgO:LiNbO3Crystal 5, through optics
Parametric effect generates level Four Stokes light 6S4 and level Four THz wave；Level Four Stokes light 6S4 is by third reflecting mirror 7 and
Amplification is vibrated in the resonant cavity of four reflecting mirrors 8 composition, and is partially exported from resonant cavity；
……
Incident 5th reflecting mirror 13 of the N-1 grade Stokes light 6S (N-1) exported from resonant cavity, the N-1 grade Stokes light 6S of transmission
(N-1) become the first N-1 grades of Stokes light 6S (N-1) 1, the N-1 grade Stokes light 6S (N-1) of reflection becomes the 2nd N-1 grades
Stokes light 6S (N-1) 2, the 2nd N-1 grades of Stokes light 6S (N-1) 2 are after the 6th reflecting mirror 14 and the reflection of the 7th reflecting mirror 15
With θ2Angle incidence MgO:LiNbO3Crystal 5 generates 6SN and N grades of THz waves of N grades of Stokes light through optical parameter effect；It is same in this way
When generate N beam Stokes light, N be integer and be greater than 1；The wavelength of N grades of Stokes light is greater than the wavelength of (N-1) grade Stokes light,
A branch of pump light 2 generates wide spectrum Stokes light 11；
The plane of beam propagation is plane determined by X-axis and Y-axis, and Z axis goes out perpendicular to the plane of beam propagation from pumping source 1
The direction of propagation for the pump light 2 penetrated is that X-axis is positive, and the direction of propagation of the second level-one Stokes light 6S12 is Y-axis negative sense；
θ1For the angle of pump light 2 and X-axis negative sense after the reflection of the second reflecting mirror 4, θ2For after the reflection of the 7th reflecting mirror 15
Incident MgO:LiNbO3The Stokes light of crystal 5 and the angle of X-axis negative sense.
Pumping source 1 use pulse laser, wavelength 1064nm, repetition rate 10Hz, single pulse energy 100mJ,
Beam diameter is 5mm, and polarization direction is Z axis.
First reflecting mirror 3, the second reflecting mirror 4, third reflecting mirror 7, the 4th reflecting mirror 8, the reflection of the 5th reflecting mirror the 13, the 6th
Mirror 14 and the 7th reflecting mirror 15 are plane mirror, and adjustable angle.
First reflecting mirror 3 and the second reflecting mirror 4 are totally reflected the pump light 2 that wavelength is 1064nm, third reflecting mirror 7, the
The Stokes light total reflections at different levels of six reflecting mirrors 14 and the 7th reflecting mirror 15 to wave-length coverage in 1064-2000nm, the 4th reflection
Mirror 8 is 60% in the Stokes light transmission rates at different levels of 1064-2000nm to wave-length coverage, the 5th reflecting mirror 13 with N-1 grades
The angle of the direction of propagation of Stokes light 6S (N-1) is 45 °, and the 5th reflecting mirror 13 is to wave-length coverage in each of 1064-2000nm
Grade Stokes light 50% reflects, 50% transmits.
MgO:LiNbO3Crystal 5 is cuboid, is rectangle in X-Y plane；MgO doping concentration is 5mol%, crystal
Optical axis is along Z axis.
MgO:LiNbO3Size X × Y × Z of crystal 5 is 40mm × 30mm × 8mm.
In the present embodiment, level-one Stokes light 6S1, second level Stokes light 6S2 ... N grades of Stokes light 6SN are by third
It is collinearly propagated in the resonant cavity of reflecting mirror 7 and the 4th reflecting mirror 8 composition.
In the present embodiment, as shown in Fig. 2, θ1Angle of the angle between pump light 2 and level-one Stokes light 6S1, θ2Angle is warp
The angle between the second level-one Stokes light 6S12 and level-one Stokes light 6S1 after the reflection of 7th reflecting mirror 15.Change θ1Angle
It can change the wavelength of Stokes light at different levels, change angle θ2It can change the Stokes at different levels in addition to level-one Stokes light 6S1
The wavelength of light.
According to principle of conservation of energy ωP=ωS+ωTAnd phase matching relationshipIt can
To calculate the wavelength of Stokes light at different levels and the frequency of THz wave at different levels.Wherein, ωP、ωS、ωTRespectively pump light
Angular frequency, the angular frequency of Stokes light, THz wave angular frequency, angle of the θ between pump light and Stokes light, kP、kS、
kTThe respectively wave vector of pump light, Stokes light, THz wave in crystal,niRespectively pump
The refractive index of Pu light, Stokes light, THz wave in crystal, c are the light velocity in vacuum.
As N=4, angle θ1It is 1 ° and angle θ2When being 1.1 °, calculate: level-one Stokes light 6S1 wavelength is 1072.7nm,
Second level Stokes light 6S2 wavelength is 1082.2nm, and three-level Stokes light 6S3 wavelength is 1091.8nm, level Four Stokes light 6S4 wave
A length of 1101.5nm.
MgO:LiNbO3The N grades of THz waves of level-one THz wave, second level THz wave ... generated in crystal 5 are not defeated
Out.
From MgO:LiNbO3The second level-one Stokes light 6S12, the second second level Stokes light 6S22 ... that crystal 5 is emitted
2nd N-1 grades of Stokes light 6S (N-1) 2 are recycled by Stokes light recycling box 16.
The present invention does not export THz wave, is only used for generating the near infrared light of wide spectrum.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.Base of the invention
This thinking is above-mentioned basic scheme, and for those of ordinary skill in the art, various changes are designed in introduction according to the present invention
The model of shape, formula, parameter do not need to spend creative work.It is right without departing from the principles and spirit of the present invention
The change, modification, replacement and modification that embodiment carries out are still fallen in protection scope of the present invention.
Claims (9)
1. a kind of wide spectrum optical parametric oscillator, it is characterised in that: including pumping source (1), MgO:LiNbO3Crystal (5), pumping
Light recycling box (9), Stokes light recycling box (16), and be arranged in MgO:LiNbO3Reflecting mirror around crystal (5)；
The pump light (2) being emitted from pumping source (1) is after the first reflecting mirror (3) and the second reflecting mirror (4) reflection with θ1Angle is incident
MgO:LiNbO3Crystal (5) generates level-one Stokes light (6S1) and level-one THz wave, level-one through optical parameter effect
Stokes light (6S1) vibrates amplification in the resonant cavity being made of third reflecting mirror (7) and the 4th reflecting mirror (8), and from resonance
It is partially exported in chamber；From MgO:LiNbO3The pump light (2) of crystal (5) outgoing is recycled by pump light recycling box (9)；
Incident 5th reflecting mirror (13) of the level-one Stokes light (6S1) exported from resonant cavity, the level-one Stokes light (6S1) of transmission
Become the first level-one Stokes light (6S11), the level-one Stokes light (6S1) of reflection becomes the second level-one Stokes light (6S12)；
Second level-one Stokes light (6S12) is after the 6th reflecting mirror (14) and the reflection of the 7th reflecting mirror (15) with θ2Angle incidence MgO:
LiNbO3Crystal (5) generates second level Stokes light (6S2) and second level THz wave through optical parameter effect；Second level Stokes light
(6S2) vibrates amplification, and the part from resonant cavity in the resonant cavity being made of third reflecting mirror (7) and the 4th reflecting mirror (8)
Output；
Incident 5th reflecting mirror (13) of the second level Stokes light (6S2) exported from resonant cavity, the second level Stokes light (6S2) of transmission
Becoming the first second level Stokes light (6S21), the second level Stokes light (6S2) of reflection becomes the second second level Stokes light (6S22),
Second second level Stokes light (6S22) is after the 6th reflecting mirror (14) and the reflection of the 7th reflecting mirror (15) with θ2Angle incidence MgO:
LiNbO3Crystal (5) generates three-level Stokes light (6S3) and three-level THz wave through optical parameter effect；Three-level Stokes light
(6S3) vibrates amplification, and the part from resonant cavity in the resonant cavity being made of third reflecting mirror (7) and the 4th reflecting mirror (8)
Output；
Incident 5th reflecting mirror (13) of the three-level Stokes light (6S3) exported from resonant cavity, the three-level Stokes light (6S3) of transmission
Becoming the first three-level Stokes light (6S31), the three-level Stokes light (6S3) of reflection becomes the second three-level Stokes light (6S32),
Second three-level Stokes light (6S32) is after the 6th reflecting mirror (14) and the reflection of the 7th reflecting mirror (15) with θ2Angle incidence MgO:
LiNbO3Crystal (5) generates level Four Stokes light (6S4) and level Four THz wave through optical parameter effect；Level Four Stokes light
(6S4) vibrates amplification, and the part from resonant cavity in the resonant cavity being made of third reflecting mirror (7) and the 4th reflecting mirror (8)
Output；
And so on,
Incident 5th reflecting mirror (13) of the N-1 grade Stokes light (6S (N-1)) exported from resonant cavity, the N-1 grade Stokes of transmission
Light (6S (N-1)) becomes the first N-1 grades of Stokes light (6S (N-1) 1), and the N-1 grade Stokes light (6S (N-1)) of reflection becomes
Two N-1 grades of Stokes light (6S (N-1) 2), the 2nd N-1 grades of Stokes light (6S (N-1) 2) are anti-through the 6th reflecting mirror (14) and the 7th
It penetrates after mirror (15) reflection with θ2Angle incidence MgO:LiNbO3Crystal (5), through optical parameter effect generate N grades of Stokes light (6SN) and
N grades of THz waves；Generate N beam Stokes light simultaneously in this way, N is integer and is greater than 1；The wavelength of N grades of Stokes light is greater than (N-1)
The wavelength of grade Stokes light, a branch of pump light (2) generate wide spectrum Stokes light (11)；
The plane of beam propagation is plane determined by X-axis and Y-axis, Z axis perpendicular to beam propagation plane, from pumping source (1)
The direction of propagation of the pump light (2) of outgoing is that X-axis is positive, and the direction of propagation of the second level-one Stokes light (6S12) is Y-axis negative sense；
θ1For the angle of pump light (2) and X-axis negative sense after the second reflecting mirror (4) reflection, θ2It is anti-through the 7th reflecting mirror (15)
Incidence MgO:LiNbO after penetrating3The Stokes light of crystal (5) and the angle of X-axis negative sense.
2. wide spectrum optical parametric oscillator according to claim 1, it is characterised in that: the pumping source (1) uses arteries and veins
Rush laser, wavelength 1064nm, repetition rate 10Hz, single pulse energy 100mJ, beam diameter 5mm, polarization direction
For Z axis.
3. wide spectrum optical parametric oscillator according to claim 1, it is characterised in that: first reflecting mirror (3),
Two-mirror (4), third reflecting mirror (7), the 4th reflecting mirror (8), the 5th reflecting mirror (13), the 6th reflecting mirror (14) and the 7th are anti-
Penetrating mirror (15) is plane mirror, and adjustable angle.
4. wide spectrum optical parametric oscillator according to claim 3, it is characterised in that: first reflecting mirror (3) and
Second reflecting mirror (4) is totally reflected the pump light (2) that wavelength is 1064nm, third reflecting mirror (7), the 6th reflecting mirror (14) and the
Seven reflecting mirrors (15) are to wave-length coverage in the Stokes light total reflections at different levels of 1064-2000nm, and the 4th reflecting mirror (8) is to wavelength model
The Stokes light transmission rates at different levels for being trapped among 1064-2000nm are 60%, the 5th reflecting mirror (13) and N-1 grades of Stokes light (6S (N-
1) angle of the direction of propagation) is 45 °, the 5th reflecting mirror (13) to wave-length coverage 1064-2000nm Stokes light at different levels
50% reflection, 50% transmission.
5. wide spectrum optical parametric oscillator according to claim 1, it is characterised in that: the MgO:LiNbO3Crystal (5)
It is rectangle in X-Y plane for cuboid；MgO doping concentration is 5mol%, and the optical axis of crystal is along Z axis.
6. wide spectrum optical parametric oscillator according to claim 5, it is characterised in that: the MgO:LiNbO3Crystal (5)
Size X × Y × Z be 40mm × 30mm × 8mm.
7. wide spectrum optical parametric oscillator according to claim 1, it is characterised in that: the level-one Stokes light
N grades of Stokes light (6SN) of (6S1), second level Stokes light (6S2) ... are by third reflecting mirror (7) and the 4th reflecting mirror (8) group
At resonant cavity in collinearly propagate.
8. wide spectrum optical parametric oscillator according to claim 1, it is characterised in that: the MgO:LiNbO3Crystal (5)
N grades of THz waves of level-one THz wave, second level THz wave ... of middle generation do not export.
9. wide spectrum optical parametric oscillator according to claim 1, it is characterised in that: from MgO:LiNbO3Crystal (5) goes out
The second level-one Stokes light (6S12), the 2nd N-1 grades of Stokes light (6S (N- of the second second level Stokes light (6S22) ... penetrated
1) 2) it by Stokes light recycling box (16) is recycled.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007085859A1 (en) * | 2006-01-26 | 2007-08-02 | The University Court Of The University Of St. Andrews | Parametric generation using intersecting cavities |
| JP4958349B2 (en) * | 2001-09-26 | 2012-06-20 | 独立行政法人理化学研究所 | Ring resonator and its fast tuning method |
| CN104158077A (en) * | 2014-07-31 | 2014-11-19 | 天津大学 | Rapid tuning terahertz parametric oscillation radiation source device and method based on rowland circle |
| CN109167236A (en) * | 2018-10-11 | 2019-01-08 | 华北水利水电大学 | A kind of three-dimensional terahertz-wave parametric oscillator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4958349B2 (en) * | 2001-09-26 | 2012-06-20 | 独立行政法人理化学研究所 | Ring resonator and its fast tuning method |
| WO2007085859A1 (en) * | 2006-01-26 | 2007-08-02 | The University Court Of The University Of St. Andrews | Parametric generation using intersecting cavities |
| CN104158077A (en) * | 2014-07-31 | 2014-11-19 | 天津大学 | Rapid tuning terahertz parametric oscillation radiation source device and method based on rowland circle |
| CN109167236A (en) * | 2018-10-11 | 2019-01-08 | 华北水利水电大学 | A kind of three-dimensional terahertz-wave parametric oscillator |
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