CN109326950A - Ring cavity structure optically erasing device - Google Patents
Ring cavity structure optically erasing device Download PDFInfo
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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
- H01S3/10—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
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- G—PHYSICS
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- 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
- G02F1/355—Non-linear optics characterised by the materials used
- G02F1/3551—Crystals
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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
- H01S3/083—Ring lasers
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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
- G02F1/392—Parametric amplification
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Abstract
A kind of ring cavity structure optically erasing device, including the first guide-lighting mirror, N block hysteroscope, N block nonlinear crystal, N block group velocity compensating shim, the reflection light mirror and color separation mirror being made of two pieces of reflecting mirrors, one aspect of the present invention is because setting light principle using for amusement, more traditional parametric amplification, monolithic crystal is short, and coupling bandwidth is bigger；On the other hand because compensating using group velocity step by step, transfer efficiency is greatly improved.The ultrashort pulse parameter that the present invention is suitable for nanosecond domain, picosecond domain and femtosecond domain amplifies.
Description
Technical field
The present invention relates to optically erasing, especially a kind of combination sets light thought and mismatching of group velocity compensation thought using for amusement
Ultrashort laser pulse parameter amplifying device, can be in femtosecond to nanosecond time domain scale, for high conversion efficiency, high-gain times
The miniaturization photoparametric amplifier of rate, high stable.
Background technique
Main path one of of the optically erasing (referred to as OPA) as current ultrashort pulse amplifying technique, in broadband arteries and veins
It is widely used, has a high potential in impulse electro-optical device.Especially in conjunction with the optical parameter chirped pulse of chirped pulse amplification technique (CPA)
Amplifying technique (OPCPA) has the advantages that high-gain, low-heat deposition, high s/n ratio, high gain-bandwidth.In the several optics of pulsewidth
In the chirp long pulse flushing device of hundred nanometer scale of ultrashort pulse or spectrum width of period magnitude, existing main problem include:
Realize > 106Coupling bandwidth reduces under the conditions of gain (crystal is longer)；Transfer efficiency needs to be further increased with stability；For
The OPA of picosecond magnitude and more short pulse, mismatching of group velocity problem is serious, restricts gain multiplying power and coupling bandwidth.
The quasi- parameter amplifying technique (Quasi- that document [Optica.2015,2 (11): 1006-1009] proposes
Parametric Amplification, referred to as QPA) main thought be by parameter amplify crystal in adulterate so that
The idle light generated in amplification process maintains in low intensity level due to being doped particle and largely absorbing, so that parameter be inhibited to put
Big-and-middle Energy Reversal is changed to improve energy conversion efficiency.But text is insufficient there are 3 points by the QPA method of doping method: first,
It realizes that equal gain multiplying power requires crystal longer, coupling bandwidth is caused to decline；Second, idle light be absorbed in crystals and
Heat is converted to, fuel factor can lead to phase mismatch or transmission wavefront distortion；Third, for the OPA of non-colinear structure, crystal
Longer to cause the offset of three wave Space Couplings bigger, walk-off effect influences serious.
Summary of the invention
The present invention provides a kind of ring cavity structure optically erasing device, and the problems in OPA of solution mainly includes following
Four aspects: first, high-gain OPA gain bandwidth reduces problem；Second, output energy stability problem；Third, OPA is converted
The relatively low problem of efficiency；Fourth, mismatching of group velocity (referred to as GVM) problem in ultrashort pulse OPA within pulsewidth picosecond domain.
To realize that above-mentioned target, technical solution of the invention are as follows:
A kind of ring cavity structure optically erasing device, it is characterized in that, including the first guide-lighting mirror, N block hysteroscope, N block be non-
Linear crystal, N block group velocity compensating shim, the reflection light mirror and color separation mirror being made of two pieces of reflecting mirrors, the N block hysteroscope
The equal composition equilateral polygon annular chamber of spacing, be level-one optically erasing grade between adjacent two pieces of hysteroscopes, it is non-comprising one piece
Linear crystal and one piece of group velocity compensating shim, the nonlinear crystal and group velocity compensating shim are in signal pulse central wavelength and pump
Pu light wave strong point realizes group-velocity mismatch compensation；It the position of the first hysteroscope of laser injection end can be to the center of circle of equal polygons circumscribed circle
It is mobile, amplify logical number to change；It is reflection light mirror after last block hysteroscope of the annular chamber, to realize letter in the vertical direction
Number light is moved down with pump light space drop point, and is inversely returned, and realizes that the multiplication of number is led in amplification；Signal light and pump light are with conllinear side
Formula is in intracavitary transmission；In nonlinear crystal, the optically erasing of collinear structure is realized, be successively described along laser injection direction
Color separation mirror, the first guide-lighting mirror, the first hysteroscope, N >=3.
The hysteroscope is the dichroscope of plated film, and film layer is high reflectance to signal light and pump light, for the light that leaves unused
For high-transmission rate, idle light be totally disappeared between realizing amplifying stage；The broadband coated reflection angle of the dichroscope is 90 ° of (N-2)/N,
N is hysteroscope quantity.
The cut direction of the nonlinear crystal is to realize that signal light and pumping center wavelength of light matching direction, crystal are long
The selection of degree is advisable within the allowable range with that can control three wave central wavelength mismatching of group velocity amounts；It is even-numbered polygons for N
Chamber, adjacent two blocks of nonlinear crystals are to rotate 180 ° of placements around transmission direction, are odd number polygon chamber for N, last block is non-
Linear crystal is replaced by the mutual inverted crystal combinations of two pieces of equal lengths, to realize that total system extraordinary ray walk-off effect is complete
Compensation.
The characteristic and length of the group velocity compensating material thin slice, need to realize to flashlight centre wavelength and pump wavelength
The mismatching of group velocity amount of transmission is definite value, and flashlight centre wavelength and pump wavelength group in the value and the nonlinear crystal
Fast amount of mismatch symbol equal in magnitude is on the contrary, to realize the static compensation of parameter amplifier mismatching of group velocity amounts at different levels.
Last described block compensation material sheet is placed among temperature controlling stove, controls its mismatching of group velocity amount using temperature, real
The now dynamic compensation of full amplifying device remnants mismatching of group velocity amount.
Technical effect of the invention is as follows:
Apparatus of the present invention give full play to the advantage for amusement for setting light thought and mismatching of group velocity compensation thought, substantially transmission optical path
Are as follows: constitute regular polygon annular chamber using dichroscope as hysteroscope, signal light and pump light with collinear manner it is intracavitary step by step
Transmission；One block of nonlinear crystal is set between every two pieces of hysteroscopes, the amplification of signal pulse parameter is realized with conllinear matching way；Every piece
One piece of group velocity compensating shim of postposition of crystal realizes mismatching of group velocity static compensation.
Hysteroscope of the invention, i.e. dichroscope are high reflectance for signal light and pumping optical band, for the light wave that leaves unused
Section is high-transmission rate, and broadband coated reflection angle is 90 ° of (N-2)/N, and N is hysteroscope quantity, when signal light and polarization of pumping beams
It is identical, and when being mutually perpendicular to idle light polarization, dichroscope can be replaced by polarization spectroscope, realize idle light from annular chamber
It transmits and goes out, stick signal light and pump light continue to transmit amplification intracavitary.
The hysteroscope of the annular chamber, quantity N.When N is even number, always lead to number and first piece of hysteroscope of chamber incidence end
Reflecting surface and annular chamber circumcenter distance, i.e. insertion is related, and under the premise of not blocking light beam, and amplifying total logical number can
It adjusts, exists with there is no respectively NM when reflection light mirror and 2NM (N >=4, M=1,2,3 ...), the bigger M of insertion is smaller；Work as N
When for odd number, it is non-adjustable to amplify total logical number, exists and there is no respectively 2N and 4N when reflection light mirror.
The selection of the monolithic nonlinear crystal length is being permitted with that can control three wave central wavelength mismatching of group velocity amounts
Perhaps in range, the too long influence that can aggravate mismatching of group velocity to single-stage amplification spectrum of crystal, crystal is too short, can reduce single-stage
Gain multiplying power always leads to the requirement of number to increase to full amplifier.
Adjacent two blocks of nonlinear crystals go away collocation structure using extraordinary ray, and inhibition walk-off effect is to transfer efficiency and surely
Qualitatively influence.
Annular chamber single cycle period final stage GVM compensating shim can utilize temprature control method, control GVM compensation rate size,
Realize the whole remaining mismatching of group velocity amount of dynamic compensation amplifying device, group velocity v in materialg, mismatching of group velocity GVM and fast mismatch lead
The time of signal pulse (s) and pumping pulse (p) is caused to go away Δ τspIt is respectively as follows:
GVM=1/vg(λs0)-1/vg(λp0) and Δ τsp=L × GVM, wherein L is material thickness, and k is the wave vector in material, and k=
2n π/λ, n are Refractive Index of Material, and λ is wavelength, λ0For center wavelength, λs0For flashlight centre wavelength, λp0To pump light center wave
It is long.
The reflection light mirror realizes that signal light is moved down with pump light space drop point in the vertical direction, and will be above-mentioned double
Light becomes anti-clockwise loops for example transmission from annular delivery clockwise, and guide-lighting mirror integrally includes two reflectings surface, and plated film requirement is 45 °
Signal light and pumping light total reflection, wherein at least one face are that idle light is highly transmissive, amplify logical number not in the unidirectional loop period
It is used in the case where foot, it can be achieved that the total logical number of full device amplification is multiplied.
In general, ring cavity structure optically erasing device of the present invention has the following advantages compared with prior art: benefit
Light, the escaping compensation method of adjacent two pieces of crystal are set with completely for amusement between the small length crystal of monolithic, grade, is realized in conjunction with ring cavity structure
The coupling bandwidth of the scheme of tens of logical amplifications, full amplifier is equal to monolithic crystal bandwidth, inhibits walk-off effect to influence, significantly mentions
High conversion efficiency and amplification stability；For the ultrashort pulse OPA within picosecond magnitude, due to using single-stage amplification crystal and benefit
Thin slice scheme is repaid, it can be achieved that the quantitative dynamic compensation of full device GVM, improves coupling bandwidth and transfer efficiency；The big width of single-stage low gain
Band OPA scheme, can give full play to competitive effect, inhibit noise amplification, improve signal-to-noise ratio.
One aspect of the present invention is because setting light principle using for amusement, and more traditional parametric amplification, monolithic crystal is short, coupling bandwidth
It is bigger；On the other hand because compensating using group velocity step by step, transfer efficiency is greatly improved.The present invention be suitable for nanosecond domain, picosecond domain with
And the ultrashort pulse parameter amplification in femtosecond domain.
Detailed description of the invention
Fig. 1 is 1 four hysteroscope ring structure optically erasing schematic device of the embodiment of the present invention
Fig. 2 is 1 four hysteroscope ring structure optically erasing device top view of the embodiment of the present invention
Fig. 3 is reflection light mirror side view in ring structure optically erasing device of the present invention
Fig. 4 is 2 three hysteroscope ring structure optically erasing device top view of the embodiment of the present invention
Fig. 5 is ring cavity structure OPA device of the present invention and common OPA device transfer efficiency comparative simulation curve graph
Fig. 6 is ring cavity structure OPA device amplification spectral simulation curve graph of the present invention
Fig. 7 is common OPA device amplification spectral simulation curve graph
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing and annular chamber knot
The embodiment of structure optically erasing device, the present invention is described in more detail.It is described herein to represent even numbered blocks hysteroscope knot
Four hysteroscope devices of structure and representative include three hysteroscope devices of odd number block hysteroscope structure, and specific embodiment is only to explain this hair
It is bright, do not limit the annular hysteroscope quantity and the logical number of amplification of apparatus of the present invention, as long as meet hysteroscope plated film service band with enter
The dichroscope characteristic requirements of firing angle degree etc., the present invention may be implemented any amount hysteroscope composition, the logical number of amplification is adjustable
, based on for amusement parameter amplifying device for setting light principle, be applicable to nanosecond domain to femtosecond domain laser amplifier system.
Embodiment 1
Four hysteroscope ring structure optically erasing devices as shown in Figure 1, its top view as shown in Fig. 2, device includes: leaded light
Mirror 1, hysteroscope, that is, dichroscope 2,5,8,11,14,15, nonlinear crystal 3,6,9,12, group velocity compensating shim 4,7,10,13, color
Separate mirror 16.
The guide-lighting mirror 1, as signal light and pumping combiner/beam splitter, substrate is plate (or small angle of wedge) glass
Glass, plated film require to show as high-transmission rate to 45 ° of incident broad band signal lights, show as high reflectance to 45 ° of incident pump lights,
Its function is that signal light and pump light is made collinearly to transmit injection annular chamber, keeps amplified signal light and residual pump light defeated in annular chamber
Separation is realized after out.
The dichroscope 2,5,8,11 is used as ring cavity structure hysteroscope, and dichroscope 14 and 15 is used as ring cavity structure
Reflection light mirror, above-mentioned dichroscope plating membrane property having the same shows as 45 ° of height in signal light and pump light wave band
Reflectivity shows as 45 ° of high-transmission rates in idle optical band, and function is to completely eliminate idle light between realizing amplifying stage, is prevented
The phase mismatch factor is accumulated between grade, so that all-pass number amplification system coupling bandwidth be maintained to be equal to single-stage crystal match bandwidth.
It, can be along the normal of reflecting surface as it is further preferred that the first hysteroscope, dichroscope 2 are placed on guide rail
Make centripetal translation, realizes that the logical number of full device clockwise/counterclockwise transmission amplification is adjusted with this, total logical number is also limited to light beam mouth
Diameter, nonlinear crystal bore, dichroscope bore.
As it is further preferred that 14 and 15 combination functions can replace reflection light mirror, plated film by monolithic corner cube mirror
It is required that one of corner cube mirror face has plating membrane property identical with hysteroscope, another corner cube mirror face at least needs to meet
Signal light and pumping light total reflection, in an implementation, bevel edge reflecting surface can not do plated film requirement, but injecting three wave impulses must be with small
Inclination angle is incident, to prevent surface reflection from returning along original optical path.
The nonlinear crystal 3,6,9,12, cut direction are both needed to meet signal light and pump light collinear manner broadband
Matching requires, crystal 3 and 6, two of crystal 9 and 12 combine to go away compensation way and place, i.e., if non-in crystal 3 and 9 seek
The escaping direction of ordinary light is in principal plane below wave vector direction, then crystal 6 and 12 must be rotated relative to 3 and 9 around wave vector
180 °, guarantee that walk-off effect compensation is realized in every two-stage amplification.
As it is further preferred that nonlinear crystal surface can plated film, realize signal light and pump light high-transmission rate.
The group velocity compensating shim 4,7,10,13, material and length requirement have in nonlinear crystal in signal
Light and pump light group-velocity mismatch amount equivalence and symbol are on the contrary, realize the signal light and pump light mismatching of group velocity in single amplifying stage
Static compensation, the plated film in terms of light-transmission characteristics require identical as nonlinear crystal plated film requirement；If sheeting is to letter
Number light or pumping optical transport there are walk-off effect, then thin slice 4 and 10, two of thin slice 7 and 13 combine, combined with nonlinear crystal
It is identical, to go away compensation way placement.
It is realized as it is further preferred that group velocity compensating shim 13 can be placed in temperature-controlled oven, passing through temperature and changing
Signal light and pump light mismatching of group velocity amount are adjusted in thin slice 13, so that the dynamic for accurately controlling full amplifying device mismatching of group velocity amount is mended
It repays.
The color separation mirror 16, as the separation mirror of output amplified signal light and idle light, substrate is (or small for plate
The angle of wedge) glass, the plated film light light that requires to leave unused to 45 ° of incidences shows as high reflectance, to 45 ° of incoming signal light show as it is high thoroughly
Penetrate rate.
The device optic path can be described as with total process is amplified: Injection Signal light and pump light are through guide-lighting mirror 1 with conllinear
Mode injects crystal 3, realizes that the first order is amplified into compensating shim 4, crystal 3 and thin slice 4 in signal light and pumping optical band
Mismatching of group velocity amount summation close to 0, three waves of outgoing are reflected with 45 ° by dichroscope 5, and signal light is reflected into pump light
Crystal 6, leave unused light transmission to chamber outside；Signal light and pump light successively pass through 7~13 clockwise in the same manner as described above, into
Enter dichroscope 2, equally passes through 3~13 with clock-wise order, after three periods clockwise, into guide-lighting mirror 14 and 15,
It realizes translation in signal light and pumping optical transport perpendicular, and inversely returns in annular chamber, through same three periods counterclockwise
Afterwards, the guide-lighting mirror 1 of return, pump light is by high reflection, and signal light and idle light enter color separation mirror 16, realizes signal light and leaves unused
Light separation.Full device realizes 24 logical amplifications altogether, wherein clockwise transmission and is enlarged into 12 logical, counterclockwise transmission and is enlarged into 12
It is logical, if the logical amplification of real system 12 can meet demand without guide-lighting mirror 14 and 15 be directly output to three wavelength-division optical elements realities
The separation of existing signal light and pump light and idle light.
Embodiment 2
For three hysteroscope ring device top views as shown in figure 4, device includes: guide-lighting mirror 1, dichroscope 2,5,8,11,12 is non-
Linear crystal 3,6,9, group velocity compensating shim 4,7,10, color separation mirror 13.The guide-lighting mirror 1, dichroscope 11,12 are non-thread
Property crystal 3,6,9, group velocity compensating shim 4,7,10 and color separation mirror 13 and four hysteroscope device provided as one homogeneous element property having the same
Matter, and dichroscope 11 and 12 constitutes reflection light mirror, structure is as shown in Figure 3.Three hysteroscope structures and four hysteroscope structural differences exist
In two aspects: first, 2,5, the 8 plated film incident direction of dichroscope of three hysteroscopes requires to be 30 °；Second, three hysteroscopes are at most real
Existing 12 logical amplification.
The calculation method citing of group velocity compensation:
For when 532nm, 808nm conllinear o+o=e, in the DKDP crystal of 20mm length amount containing deuterium 98%,
Coupling bandwidth may be implemented on 36.33 ° of direction and reach 63nm, then mismatching of group velocity in this direction be GVM=-1.31 ×
10-11Signal light caused by the DKDP crystal of s/m=-131fs/cm, 20mm length and pump light pulse envelope time delay are Δ
τsp=-2.62 × 10-13S=-262fs.
To compensate the time delay, can choose and place the amount containing deuterium that cutting angle is 90 ° at rear is 98%
DKDP crystal.On the angle direction, the mismatching of group velocity of signal light and pump light is GVM=8.05 × 10-11S/m=805fs/
Cm, then when crystal length is 3.3mm, pulse envelope delay is 262fs.
In addition, may be selected to place the KDP crystal progress group-velocity mismatch compensation that cutting angle is 90 ° at rear.In the angle
On direction, the mismatching of group velocity of signal light and pump light is GVM=1048fs/cm, then when crystal length is 2.5mm, pulse packet
Network delay is 262fs.
Conllinear matched optical parametric amplification citing:
By taking the conllinear o+o=e matching way of 532nm, 808nm as an example, it is bent to provide OPCPA process conversion efficiency curve, spectrum
Line, it was demonstrated that hoisting power.After 10 grades of ring-like optically erasings, effect such as attached drawing 5 is promoted to shown in Fig. 7.Transfer efficiency compared with
Traditional OPA amplifier is promoted to 56%, and output spectrum bandwidth and gain bandwidth increase to 75nm by 50nm.
Experiment shows one aspect of the present invention because setting light principle, more traditional parametric amplification, monolithic crystal using for amusement
Short, coupling bandwidth is bigger；On the other hand because compensating using group velocity step by step, transfer efficiency is greatly improved.The present invention is suitable for nanosecond
The ultrashort pulse parameter in domain, picosecond domain and femtosecond domain amplifies.
Claims (5)
1. a kind of ring cavity structure optically erasing device, which is characterized in that non-thread including the first guide-lighting mirror, N block hysteroscope, N block
Property crystal, N block group velocity compensating shim, the reflection light mirror and color separation mirror being made of two pieces of reflecting mirrors, the N block hysteroscope
The equal composition equilateral polygon annular chamber of spacing is level-one optically erasing grade between adjacent two pieces of hysteroscopes, non-thread comprising one piece
Property crystal and one piece of group velocity compensating shim, the nonlinear crystal and group velocity compensating shim are in signal pulse central wavelength and pumping
Light wave strong point realizes group-velocity mismatch compensation；The position of the first hysteroscope of laser injection end can be moved to the center of circle of equal polygons circumscribed circle
It is dynamic, amplify logical number to change；It is reflection light mirror after last block hysteroscope of the annular chamber, to realize signal in the vertical direction
Light is moved down with pump light space drop point, and is inversely returned, and realizes that the multiplication of number is led in amplification；Signal light and pump light are with collinear manner
In intracavitary transmission；In nonlinear crystal, the optically erasing of collinear structure is realized, be successively described along laser injection direction
Color separation mirror, the first guide-lighting mirror, the first hysteroscope, N >=3.
2. ring cavity structure optically erasing device as described in claim 1, it is characterised in that the hysteroscope is plated film
Dichroscope, film layer are high reflectance to signal light and pump light, are high-transmission rate for idle light, leave unused between realization amplifying stage
Light totally disappeared；The broadband coated reflection angle of the dichroscope is 90 ° of (N-2)/N, and N is hysteroscope quantity.
3. ring cavity structure optically erasing device as described in claim 1, it is characterised in that the nonlinear crystal
Cut direction is to realize signal light and pumping center wavelength of light matching direction, and the selection of crystal length is with can be by cardiac wave in three waves
Long mismatching of group velocity amount control is advisable within the allowable range；It is even-numbered polygons chamber for N, adjacent two blocks of nonlinear crystals are around biography
Defeated direction rotates 180 ° of placements, is odd number polygon chamber for N, last block nonlinear crystal is mutually fallen by two pieces of equal lengths
The crystal combinations set replace, to realize that total system extraordinary ray walk-off effect is fully compensated.
4. ring cavity structure optically erasing device as described in claim 1, it is characterised in that the group velocity compensating material
The characteristic and length of thin slice, the mismatching of group velocity amount to flashlight centre wavelength and pump wavelength transmission that need to realize are definite value, and
Flashlight centre wavelength and pump wavelength mismatching of group velocity amount symbol equal in magnitude in the value and the nonlinear crystal on the contrary,
To realize the static compensation of parameter amplifier mismatching of group velocity amounts at different levels.
5. such as the described in any item ring cavity structure optically erasing devices of Claims 1-4, it is characterised in that described is last
One block compensation material sheet is placed among temperature controlling stove, is controlled its mismatching of group velocity amount using temperature, is realized full amplifying device remnants group
The dynamic of fast amount of mismatch compensates.
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| CN114089581A (en) * | 2021-11-24 | 2022-02-25 | 重庆邮电大学 | Compressed light control method based on coupling three-resonance optical parameter amplification cavity |
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