CN109103740A - A method of ultra-wideband-light radiation is generated based on chirped pulse optical parametric oscillator - Google Patents
A method of ultra-wideband-light radiation is generated based on chirped pulse optical parametric oscillator 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
Abstract
The invention discloses a kind of methods for generating ultra-wideband-light radiation based on chirped pulse optical parametric oscillator；It include: the pump light and corresponding second order nonlinear crystal that corresponding wave band is determined according to the wavelength of required ultra-wideband-light radiation；The length of second order nonlinear crystal is determined according to the bandwidth that required ultra-wideband-light radiates, and the pulse width of pump light is determined according to second order nonlinear crystal；Ensure that there are self phase modulations in optical parameter resonant cavity by the element of the intracavitary third-order non-linear of setting optical parametric oscillator, to obtain spectrum widening.The present invention makes optical parametric oscillator work under the mode of chirped pulse by introducing enough Third-order nonlinearities in resonant cavity, and the dispersion adjustment element in transit chamber carries out accurate control to intracavitary net dispersion, so that the ultra-wideband-light of optical parametric oscillator output close to second order nonlinear crystal phase matched bandwidth radiates.
Description
Technical field
The invention belongs to mid-infrared light source domains, are produced more particularly, to one kind based on chirped pulse optical parametric oscillator
The method of raw ultra-wideband-light radiation.
Background technique
The ultra broadband light source of spatial coherence is in scientific research, component measurement, Matter Composition detection, medical diagnosis, imaging
Equal fields are widely used.For example, the ultra wide band mid-infrared light source of spatial coherence can be used for realizing the high sensitivity to molecule
Identification and quantitative detection.
Thermal light source based on black body radiation is most common wideband light source；However, black body radiation thermal light source is non-phase
Dry light source, spectral luminance factor is low, thus noise is relatively low, and efficiency is relatively low for can be obtained when spectral measurement.Based on non-linear
The difference frequency generator and optical parametric oscillator of frequency conversion can be used for generating broad band laser output.But its instantaneous output bandwidth is limited
In the bandwidth of pump laser, need to realize using wavelength tuning broader output wavelength coverage area [F.Adler,
K.C.Cossel, M.J.Thorpe, I.Hartl, M.E.Fermann, and J.Ye, ' Phase-stabilized, 1.5W
Frequency comb at 2.8-4.8microm, ' Opt.Lett.34 (9), 1330-1332 (2009)].Therefore, instantaneous band
The wide ultra-wide-band emission equipment for being far wider than pump-bandwidth is a research hotspot in nonlinear frequency conversion.In recent years, pass through
Using degeneracy optical parametric oscillator, realize close to 60THz instantaneous spectrum coverage area [M.Jankowski, A.Marandi,
C.R.Phillips, R.Hamerly, K.A.Ingold, R.L.Byer and M.M.Fejer, ' Temporal Simultons
In Optical Parametric Oscillators, ' Phys.Rev.Lett.120,053904 (2018)]；However, the light
Parametric oscillator works under same step (Simultons) this special state, it is difficult to be generalized to any other wavelength.It mentions recently
Having gone out the method based on the generation broadband light radiation of intracavitary spectrum beam combination, [Zhang Zhaowei, Liu Pei, a kind of generation ultra-wideband-light radiation are set
Standby and method, patent of invention, publication number 106405974A], but since this method is relative complex.It 2015, thanks to Guoqiang et al. and mentions
Go out by the way that Third-order nonlinearity is added in optical parametric oscillator, and the intracavitary net dispersion of optical parametric oscillator is made to be positive value
When, it can use narrowband pump light generation broadband signal light and [thank to Guoqiang, Wang Fuyong, Qin Zhipeng, Qian Liejia, Yuan Peng are based on dispersion
With the impulse compression method of non-linear management optical parametric oscillator, patent of invention, publication number 104362503A].
Summary of the invention
In view of the drawbacks of the prior art, the purpose of the present invention is to provide one kind is produced based on chirped pulse optical parametric oscillator
The method of raw ultra-wideband-light radiation, it is intended to which wide spectrum output and EO-1 hyperion brightness can not be provided simultaneously with by solving current mid-infrared light source
The problem of.
The present invention provides a kind of methods for generating ultra-wideband-light radiation based on chirped pulse optical parametric oscillator, including under
State step:
S1: the pump light and corresponding second nonlinear of corresponding wave band are determined according to the wavelength that required ultra-wideband-light radiates
Crystal；
S2 determines the length of the second order nonlinear crystal according to the bandwidth that required ultra-wideband-light radiates, and according to described two
Rank nonlinear crystal determines the pulse width of pump light；
S3: ensure to exist in optical parameter resonant cavity by the element of the intracavitary third-order non-linear of setting optical parametric oscillator
Self phase modulation, to obtain spectrum widening.
Accurate dispersion adjustment element is added in the present invention in optical parametric oscillator, by fine adjustment dispersion adjustment element,
Optimal intra-cavity dispersion is obtained, so that optical parametric oscillator keeps steady operation, and institute's output signal light spectrum is most wide.
Further, when the third-order non-linear deficiency of the intracavitary second order nonlinear crystal of optical parametric oscillator in beche-de-mer without spike
It measures and is inserted into third-order non-linear material in oscillator chamber.
Further, positive and negative the one of the positive and negative and third-order non-linear phase shift of the intracavitary net dispersion of the optical parametric oscillator
It causes.
Further, when the intracavitary nonlinear phase shift of optical parametric oscillator be timing, control the optical parametric oscillator chamber
Interior net dispersion is positive；When the intracavitary nonlinear phase shift of optical parametric oscillator is negative, it is intracavitary to control the optical parametric oscillator
Net dispersion symbol is negative.
Further, the net dispersion is ensured by adjusting the intracavitary dispersion adjustment element of the optical parametric oscillator
It is positive and negative positive and negative identical with the third-order non-linear phase shift.
Further, the dispersion adjustment element intracavitary by optical parametric oscillator described in fine adjustment obtains optimal
Intra-cavity dispersion, so that optical parametric oscillator keeps steady operation, and institute's output signal light spectrum is most wide.
Further, in step sl, the central wavelength radiated according to required ultra-wideband-light selects wavelength to be less than in this
The pump light and can realize phase matched to pump light, signal light and ideler frequency light and transparent second nonlinear that cardiac wave is grown
Crystal.
Further, in step s 2, the length of corresponding second order nonlinear crystal is determined by G=sinc (Δ kL/2)
Degree；Wherein G represents gain bandwidth, and Δ k represents phase bit mismatch, and L represents crystal length.
Further, in step s 2, the pulse width of pump light is determined by τ=L/GVM；Wherein L represents crystal
Length, GVM represent the group velocity mispairing of pump light and signal light, and τ represents pumping pulse width.
It is provided by the invention that ultra-wideband-light is generated based on the chirped pulse optical parametric oscillator of accurate intra-cavity dispersion adjusting
In the method for radiation, according to the wavelength that required ultra-wideband-light radiates, select the pump light of corresponding wave band and corresponding second order non-
Linear crystal；According to the bandwidth that required ultra-wideband-light radiates, the length of corresponding second order nonlinear crystal is determined, then determine pump
The pulse width of Pu light；The element of the intracavitary third-order non-linear of optical parametric oscillator is set, to ensure optical parameter resonant cavity memory
In enough self phase modulations, to obtain enough spectrum widenings.If second order nonlinear crystal itself has bigger three
When rank is non-linear, the Third-order nonlinearity can be provided by nonlinear crystal.If intracavitary second order nonlinear crystal itself
Third-order non-linear it is insufficient, can be by being inserted into additional third-order non-linear material, the third-order non-linear effect in resonant cavity
It can be provided by the material additionally inserted.
Simultaneously, it is desirable that the symbol of the intracavitary net dispersion of optical parametric oscillator is consistent with the symbol of third-order non-linear phase shift, with true
Optical parametric oscillator work is protected in chirped pulse mode.Intracavitary net dispersion by second order nonlinear crystal, third-order non-linear crystal and
Dispersion adjustment element provides jointly, when intracavitary nonlinear phase shift be timing, answer net dispersion symbol in control chamber to be positive；If intracavitary
When nonlinear phase shift is negative, then net dispersion symbol in control chamber is answered to be negative.It can be protected by the dispersion adjustment element in adjusting cavity
It is identical as the symbol of third-order non-linear phase shift to hinder intracavitary net dispersion symbol.
Wherein, the intracavitary net dispersion amount of fine tune optical parametric oscillator is ensuring optical parametric oscillator work in chirp
Make intracavitary net dispersion as low as possible under conditions of pulse mode, to obtain the light pulse of wider band.By to intracavitary net dispersion
Fine tune, to optimize the output bandwidth of optical parametric oscillator.
And intracavitary accurate dispersion adjustment element can by prism to, grating to, optical material splitter, chirped mirror or optics
The composition such as material windows piece.By adjusting the spacing of dispersion adjustment element, material category and thickness or coating designs, so that chamber
Interior net dispersion shows lesser value as far as possible, finally makes the signal light bandwidth of output close to the phase of second order nonlinear crystal
Position coupling bandwidth.
Relative to infrared blackbody source in existing, since present invention employs laser as pumping source, in generation
Infrared radiation spectrum brightness is higher.Relative to existing single-resonant optical parametric oscillator, although the phase of second order nonlinear crystal
Coupling bandwidth is very wide, and the signal light bandwidth of output is finally limited by pump light bandwidth, can not efficiently use second nonlinear
The wider phase matched bandwidth of crystal, by the present invention in that signal light work eliminates pump light under the mode of chirped pulse
Limitation of the bandwidth to signal light, it is thus possible to the wider phase matched bandwidth of second order nonlinear crystal is efficiently used, it can be in office
Wave band of anticipating realizes ultra-wideband-light radiation.Relative to existing degeneracy optical parametric oscillator, since long pulse can be used in the present invention
It is pumped, and carries out the structure of single resonance, it is lower to the synchronism requirement of pumping pulse and signal pulse, thus its stability
Also more preferable.It is generated relative to existing difference frequency and parameter amplifying technique, due to present invention employs cavity resonator structure, thus efficiency
Height, beam quality are more preferable.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of infrared ultra-wideband-light parametric oscillator provided in an embodiment of the present invention.
Fig. 2 is a kind of structural schematic diagram for the intra-cavity dispersion regulating element that present example provides.
Fig. 3 is another structural schematic diagram for the intra-cavity dispersion regulating element that present example provides.
Fig. 4 is the phase matched bandwidth figure of second nonlinear provided in an embodiment of the present invention.
Fig. 5 is the relationship of output bandwidth provided in an embodiment of the present invention Yu intracavitary net dispersion value.
Fig. 6 is ultra-wideband-light spectral radiance map provided in an embodiment of the present invention.
Wherein, 1 is pumping source, and 2 be second order nonlinear crystal, and 3 be third-order non-linear crystal, and 4 adjust member for intra-cavity dispersion
Part, 5-8 are curved reflector, and 9 be output coupling mirror, and 10 be prism group, and 11 be the first reflecting mirror, and 12 be splitter, and 13 be second
Reflecting mirror.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The purpose of the present invention is to provide it is a kind of based on accurate intra-cavity dispersion adjust chirped pulse optical parametric oscillator come
The method for generating ultra-wideband-light radiation, by introducing enough third-order non-linears in optical parametric oscillator, so that traditional light
Parametric oscillator works under the mode of chirped pulse, and further dispersion adjustment element makes optical parametric oscillator in adjusting cavity
It realizes ultra-wideband-light radiation, the ultra-wide of different-waveband can be effectively generated using the phase matched bandwidth of second order nonlinear crystal
Band light radiation.
The mechanism that the signal light of ultra wide band generates in single-resonant optical parametric oscillator is as follows.The gain of nonlinear crystal makes
Signal light is amplified；Third-order non-linear element broadens signal light spectrum as far as possible so that optical parametric oscillator work exists
The mode of chirped pulse；Dispersion adjustment element makes intracavitary net dispersion sufficiently small so that the chirp of intracavitary signal pulse is sufficient
Enough big, i.e., the spectrum widening of intracavitary signal light is sufficiently wide.When gain, dispersion and third-order non-linear meet certain relationship, letter
The spectral bandwidth of number light can be close to the phase matched bandwidth of second order nonlinear crystal.Present invention firstly provides chirped pulses
The signal light spectrum output of ultra wide band is obtained in optical parametric oscillator by suitably dispersion management.The major advantage of this method is
The ultra-wideband-light radiation of different-waveband can be effectively generated using the phase matched bandwidth of second order nonlinear crystal.
The present invention utilizes the single resonance parametric oscillator of synchronous pump, non-according to required signal light bandwidth selection second order
Linear crystal is pump light strobe pulse width according to the second order nonlinear crystal length selected, and only signal pulse is in chamber
Interior resonance.Pump light provides positive gain, the nonlinear phase shift that third-order non-linear element provides to the conversion of the parameter of signal light
Broadened signal light spectrum, intra-cavity dispersion regulating element make intracavitary net dispersion symbol identical with third-order non-linear phase shifted symbols and
When sufficiently small, signal light is in the intracavitary spectrum that can be formed close to second order nonlinear crystal phase matched bandwidth, to obtain
Ultra-wideband-light radiation.Since nonlinear crystal usually supports wider phase matched bandwidth in optical parametric oscillator, at the same it is intracavitary
Third-order non-linear element can realize the broadening of effective signal spectrum, therefore may be implemented through the invention close to second order non-linear
Property crystalline phase coupling bandwidth ultra-wideband-light radiation.
Concrete thought of the invention be met by designing system parameter it is intracavitary have enough third-order non-linear phase shifts,
Intracavitary net dispersion symbol is consistent and sufficiently small with third-order non-linear phase shift simultaneously, realizes that the signal light of broadband spectral generates, from
And the ultra-wideband-light obtained close to second order nonlinear crystal phase matched bandwidth radiates, and specifically includes the following steps:
(1) according to required ultra-wideband-light radiate central wavelength, select wavelength be less than the central wavelength pump light and
Phase matched can be realized to pump light, signal light and ideler frequency light and transparent second order nonlinear crystal, specifically, if should
Central wavelength is 1.5 μm, then may be selected 1 μm and be used as pump light, the period polarized phosphoric acid crystalline lithium of simultaneous selection is non-as second order
Linear crystal.
(2) according to required ultra-wideband-light radiate bandwidth, by G=sinc (Δ kL/2) (wherein G represents gain bandwidth,
Δ k represents phase bit mismatch, and L represents crystal length) determine the length of corresponding second order nonlinear crystal, then pass through τ=L/GVM
(wherein L represents crystal length, and GVM represents the group velocity mispairing of pump light and signal light, and τ represents pumping pulse width) determines pump
The pulse width of Pu light.
(3) the intracavitary third-order non-linear element of setting optical parametric oscillator, to ensure to exist in optical parameter resonant cavity from phase
Position mudulation effect, to obtain spectrum widening, (nonlinear refractive index of third-order non-linear element is bigger, and self phase modulation is got over
Greatly, thus spectrum can to broaden amplitude bigger, numerical simulation can be passed through calculate carry out experimental verification).The third-order non-linear effect
It can be provided by the third-order non-linear material being inserted into.
(4) symbol and third-order non-linear phase shift (γ P of the intracavitary net dispersion of optical parametric oscillator (GDD) are required0Leff) just
Minus symbol is consistent, to ensure optical parametric oscillator work in chirped pulse mode.Intracavitary net dispersion is by second order nonlinear crystal, and three
Rank nonlinear crystal and dispersion adjustment element provide jointly, when intracavitary nonlinear phase shift is timing, net dispersion are answered in control chamber to accord with
It number is positive；If intracavitary nonlinear phase shift is negative, net dispersion symbol in control chamber is answered to be negative.The color in adjusting cavity can be passed through
Scattered regulating element is identical as the symbol of third-order non-linear phase shift to ensure intracavitary net dispersion symbol.
(5) by the fine tune to intracavitary net dispersion, to optimize the output bandwidth of optical parametric oscillator.Intracavitary precision
Dispersion adjustment element can by prism to, grating to, optical material splitter, chirped mirror or optical material diaphragm etc. form.It is logical
Spacing, material category and the thickness or coating designs of adjustment dispersion adjustment element are crossed, so that intracavitary net dispersion is meeting three ranks
Nonlinear phase shift is consistent and optical parametric oscillator is made to keep steady operation, and institute's output signal light spectrum is most wide, finally makes
The signal light bandwidth that must be exported is equal to the phase matched bandwidth of second order nonlinear crystal.
Compared with prior art, the beneficial effects of the invention are as follows can completely utilize the wider phase of second order nonlinear crystal
Coupling bandwidth can realize ultra-wideband-light radiation in any wave band.
The long pulse that can be used of this system is pumped, low to synchronism requirement, thus stability is good, due to using
Cavity resonator structure, thus it is high-efficient, and beam quality is good.
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, the specific embodiments are only for explaining the present invention, not
For limiting the present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below that
Not constituting conflict between this can be combined with each other.
Below with reference to example and attached drawing, the present invention is described further.
It is the schematic diagram of the method for the present invention referring initially to Fig. 1, Fig. 1.The resonant cavity of optical parametric oscillator of the present invention is anti-by curved surface
Mirror, dispersion adjustment element and output coupling mirror composition are penetrated, has second order nonlinear crystal and third-order non-linear element in resonant cavity.It is logical
It crosses and focuses on the pumping pulse that the pumping source outside resonant cavity generates on second order nonlinear crystal, parameter transform occurs, generate letter
Number light simultaneously provides gain for its intracavitary oscillation；The signal pulse of generation generates third-order non-linear when passing through third-order non-linear element
Effect, to obtain spectrum widening；A part of signal pulse is exported by output coupling mirror, to obtain ultra-wideband-light spoke
It penetrates；Dispersion adjustment element by the dispersions of other elements in compensated cavity so that after third-order non-linear element in time by
The signal pulse of broadening is returned to pulse width identical with pumping pulse and position, so that gain next time is obtained, it is final logical
Accurate dispersion adjustment is crossed, so that signal light bandwidth reaches maximum value.
It is illustrated below with reference to the example of a numerical simulation.
The nonlinear crystal of selection is period polarized lithium columbate crystal.Pump light comes from mode locked fiber laser and amplification
Device system, central wavelength 1058nm, pulse width are 200fs or so, repetition rate 100MHz.Crystal length is about 500
Micron, polarization cycle are 29.98 microns, and phase matched bandwidth is as shown in Figure 4.Since three ranks of lithium columbate crystal itself are non-
Linear smaller (nonlinear refractive index n2=3 × 10-19m2/ W), intracavitary third-order non-linear element is by the ZnSe window that additionally inserts
Piece (nonlinear refractive index n2=3.2 × 10-18m2/ W) and a pair of of concave mirror composition.Intra-cavity dispersion regulating element can by such as Fig. 2 or
Structure composition shown in Fig. 3, by being adjusted and can control intracavitary net dispersion according to direction shown in black arrow.Work as pump
When Pu power is 2W, intra-cavity dispersion and the relationship of signal light radiation spectrum bandwidth are as shown in Figure 5.Dispersion adjustment element in transit chamber
Net second-order dispersion is to 200fs in adjusting cavity2The ultra-wideband-light radiation of signal light can be obtained, spectrogram is as shown in Figure 6.At this point,
Signal light spectrum -10dB bandwidth is 283nm, and -10dB phase matched the bandwidth of second order nonlinear crystal is 334nm.
The present invention is by the intracavitary net dispersion in management optical parametric oscillator with third-order non-linear, it can be achieved that second order non-linear
Property crystalline phase coupling bandwidth effective use to obtain ultra-wideband-light radiation, have important potential using value.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (9)
1. a kind of method for generating ultra-wideband-light radiation based on chirped pulse optical parametric oscillator, which is characterized in that including following
Step:
S1: determine that the pump light of corresponding wave band and corresponding second nonlinear are brilliant according to the wavelength that required ultra-wideband-light radiates
Body；
S2 determines the length of the second order nonlinear crystal according to the bandwidth that required ultra-wideband-light radiates, and non-according to the second order
Linear crystal determines the pulse width of pump light；
S3: ensure exist from phase in optical parameter resonant cavity by the element of the intracavitary third-order non-linear of setting optical parametric oscillator
Position mudulation effect, to obtain spectrum widening.
2. the method as described in claim 1, which is characterized in that when the three of the intracavitary second order nonlinear crystal of optical parametric oscillator
In the intracavitary insertion third-order non-linear material of optical parametric oscillator when rank is non-linear insufficient.
3. method according to claim 1 or 2, which is characterized in that the intracavitary net dispersion of optical parametric oscillator it is positive and negative with
Third-order non-linear phase shift it is positive and negative consistent.
4. method as claimed in claim 3, which is characterized in that when the intracavitary nonlinear phase shift of optical parametric oscillator is timing, control
The intracavitary net dispersion of the optical parametric oscillator is made to be positive；When the intracavitary nonlinear phase shift of optical parametric oscillator is negative, institute is controlled
The intracavitary net dispersion symbol of optical parametric oscillator is stated to be negative.
5. the method as claimed in claim 3 or 4, which is characterized in that by adjusting the intracavitary dispersion of the optical parametric oscillator
Regulating element ensures the positive and negative positive and negative identical with the third-order non-linear phase shift of the net dispersion.
6. the method as described in claim 3-5, which is characterized in that pass through the intracavitary color of optical parametric oscillator described in fine adjustment
Regulating element is dissipated, optimal intra-cavity dispersion is obtained, so that optical parametric oscillator keeps steady operation, and institute's output signal light light
It composes most wide.
7. as the method according to claim 1 to 6, which is characterized in that in step sl, according to required ultra-wideband-light spoke
The central wavelength penetrated, select wavelength be less than the central wavelength pump light and can be real to pump light, signal light and ideler frequency light
Existing phase matched and transparent second order nonlinear crystal.
8. the method according to claim 1 to 7, which is characterized in that in step s 2, pass through G=sinc (Δ kL/2)
Determine the length of corresponding second order nonlinear crystal；Wherein G represents gain bandwidth, and Δ k represents phase bit mismatch, and it is long that L represents crystal
Degree.
9. the method according to claim 1, which is characterized in that in step s 2, determined and pumped by τ=L/GVM
The pulse width of Pu light；Wherein L represents crystal length, and GVM represents the group velocity mispairing of pump light and signal light, and τ represents pumping
Pulse width.
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| CN112436369B (en) * | 2020-11-06 | 2022-05-27 | 上海交通大学 | Method for purifying spectrum and improving stability of synchronous pumping optical parametric oscillator |
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