CN102879969A - Optical frequency comb on basis of spectral shaping self difference frequency generation technology - Google Patents
Optical frequency comb on basis of spectral shaping self difference frequency generation technology Download PDFInfo
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- CN102879969A CN102879969A CN201210369642XA CN201210369642A CN102879969A CN 102879969 A CN102879969 A CN 102879969A CN 201210369642X A CN201210369642X A CN 201210369642XA CN 201210369642 A CN201210369642 A CN 201210369642A CN 102879969 A CN102879969 A CN 102879969A
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Abstract
The invention discloses an optical frequency comb with high stability and high repetition frequency on the basis of a spectral shaping self difference frequency generation technology. The optical frequency comb comprises a pumping source, a period-magnitude femtosecond titanium sapphire oscillator, a self difference frequency generation measuring device and a feedback circuit. Pumping light generated by the pumping source is transmitted into the period-magnitude femtosecond titanium sapphire oscillator, the period-magnitude femtosecond titanium sapphire oscillator is used for generating approximately M-shaped femtosecond spectral pulses, and two sides of each femtosecond spectral pulse are high while the middle of the femtosecond spectral pulse is low; a part of the femtosecond spectral pulses is transmitted to the self difference frequency generation measuring device so that carrier-envelope phase offset frequency (CEO frequency) of the spectral pulses can be measured; and another part of the femtosecond spectral pulses forms repetition frequency signals, and the repetition frequency signals are transmitted to the period-magnitude femtosecond titanium sapphire oscillator via the repetition frequency feedback circuit. The optical frequency comb has the advantages of compact structure, long locking time, high repetition frequency and output available power, low phase noise and the like, and can be mainly applied to scientific research for absolute measurement for optical frequency, optical clock formation, attosecond generation and the like.
Description
Technical field
The present invention relates to the femtosecond laser technology field, particularly a kind of based on the optical frequency com of light spectrum reshaping from the difference frequency technology.
Background technology
The femtosecond laser frequency comb technology is one of research contents of present ultra-short pulse laser science forefront, people propose and realize femtosecond laser carrier envelope phase drift (Carrier-Envelope phase Offset in several years of last century end, CEO) since the phase-locked control of frequency, the development of this technology has not only caused the revolutionary character progress of optical frequency measurement research, and realized that like never before optical frequency is connected with the direct of microwave frequency, and promoted the fast development of Ah second's laser physics and ultrafast science.
It is pointed out that the control of femtosecond laser CEO and the realization of optical frequency com, mainly have benefited from first appearance and the employing of photonic crystal fiber (Photon Crystal Fiber, PCF).The core of the optical frequency com that extensively adopts in the world at present is just take PCF as the basis, because PCF can be with Femtosecond laser spectroscopy broadening to more than the octave, therefore so that people might realize measurement to the CEO frequency by so-called self-reference technology for the first time.But the core diameter that PCF is minimum (1～2 μ m) and intrinsic high loss (〉 70%), the skew that not only incident laser is fine all can cause the marked change of output spectrum, and limited getable output power, particularly PCF is under the laser incident of high focus strength, and the surface is very easily damaged.Because these factors, so that usually can only steady operation about half an hour based on the femtosecond laser CEO of self-reference technology locking, output power also only has tens mW, and complex structure, bulky, maintenance cost is high, thereby has greatly limited the practicality of optical frequency com.
2004, the scientist of Germany horse general quantum optical research institute (MPQ) has proposed a kind of by difference frequency (Difference Frequency Generation, DFG) the different spectral components of super wide laser pulse self and the method for measuring and control CEO are (referring to Fuji T, et al.2005 Opt.Lett.30 (332)), this technology is owing to adopting the difference frequency that produces in the lithium columbate crystal (PPLN) in accurate phase matching electric polarization cycle, from nonlinear effects such as phase-modulations and realize measurement to the CEO frequency, therefore can not require spectrum widening to an octave, the low-power and the stability problem that have so also brought with regard to having avoided necessary employing PCF, but at present the deficiency that exists of this technology be stable femtosecond laser repetition frequency less than 100MHz, and the output available horsepower only has tens milliwatts.Because light is combed needed desirable repetition frequency General Requirements greater than 200MHz, the peak power of femtosecond pulse will descend when but repetition frequency was too high, cause from difference frequency can't realize or obtain excessively low from the difference frequency spectral energy, thereby can not get the CEO signal of enough signal to noise ratio (S/N ratio)s, the control of CEO signal is not just known where to begin yet.Therefore, need a kind of high repetition optical frequency com based on the difference frequency technology.
Summary of the invention
For the problem that prior art exists, the present invention proposes a kind of device that produces high repetition frequency femtosecond laser frequency comb based on light spectrum reshaping from the difference frequency technology.
The present invention is achieved through the following technical solutions above-mentioned purpose:
According to the present invention, a kind of optical frequency com is provided, comprise: pumping source, cycle magnitude femto second titanium jewel oscillator, from difference frequency measurement mechanism and feedback circuit, wherein, the pump light that is produced by pumping source enters described cycle magnitude femto second titanium jewel oscillator, and this cycle magnitude femto second titanium jewel oscillator is the femtosecond spectrum pulse of the cardinal principle M shape that both sides are high, the centre is low for generation of shape; The part of this femtosecond spectrum pulse be transported to described from the difference frequency measurement mechanism measuring the carrier envelope phase shift frequency (CEO frequency) of this spectrum pulse, another part forms the repetition frequency signal and is transferred back cycle magnitude femto second titanium jewel oscillator through described repetition frequency feedback circuit.
In technique scheme, be provided with the output coupling mirror of plated film in the described cycle magnitude femto second titanium jewel oscillator, export the femtosecond spectrum pulse of described cardinal principle M shape through the output coupling mirror of this plated film, it is 10% deielectric-coating that described plated film is designed in 750nm ~ 850nm wave band transmitance.
In technique scheme, described repetition frequency feedback circuit is made of PIN pipe, the first phase lock circuitry and the piezoelectric ceramics that is arranged in the cycle magnitude femto second titanium jewel oscillator, wherein received by the PIN pipe by described a part of spectrum pulse of cycle magnitude femto second titanium jewel oscillator output and feed back in the cycle magnitude femto second titanium jewel oscillator by the first phase lock circuitry, the flexible change chamber length by being installed in the piezoelectric ceramics in the cycle magnitude femto second titanium jewel oscillator is to control this repetition frequency.
In technique scheme, optical frequency com also can comprise and is arranged on described CEO frequency feedback circuit after difference frequency measurement mechanism light path, wherein the infrared light by described spectrum pulse from difference frequency measurement mechanism output partly forms the CEO frequency signal, and this signal feeds back to the acoustooptical modulator that is arranged between pumping source and the cycle magnitude femto second titanium jewel oscillator to control this CEO frequency through CEO frequency feedback circuit.
In technique scheme, described CEO frequency feedback circuit is made of infrared avalanche photodide, the second phase lock circuitry and acoustooptical modulator, and wherein said infrared light part is received by infrared avalanche photodide and feeds back to acoustooptical modulator by the second phase lock circuitry.
In technique scheme, by the available light pulse output as the light comb of the visible light part of described spectrum pulse from difference frequency measurement mechanism output.
In technique scheme, describedly comprise two concave surface silver mirrors and a nonlinear crystal from the difference frequency measurement mechanism, the part of the spectrum pulse after the described shaping focuses on by concave surface silver mirror wherein and is coupled in the nonlinear crystal, and then through another piece concave surface silver mirror collimation output.
In technique scheme, described nonlinear crystal is selected the lithium columbate crystal in accurate phase matching electric polarization cycle.
In technique scheme, described repetition frequency feedback circuit and CEO frequency feedback circuit are locked onto external microwave reference source simultaneously, and this external microwave reference source for example is microwave atomic clock or light clock.
Compared with prior art, because the innovative design that the present invention has adopted the cycle magnitude femto second titanium jewel oscillator with light spectrum reshaping to combine with beat measurement CEO frequency technique, thereby cause having following outstanding feature:
1. degree of stability is high, and locking time is long; Because need not to use the photonic crystal fiber chamber outside, thereby greatly improved the stability of frequency comb, compared self-reference frequency comb common halfhour locking time, monolithic light of the present invention is combed and is brought up to more than 9 hours locking time.
2. repetition frequency is high; Compare the light comb of similar technology in the world, the present invention brings up to repetition frequency more than the 400MHz, and this is the high repetition frequency of at present international similar light comb, is conducive to the application of frequency measurement.
3. output power is high; The typical output power of the present invention can reach more than the 200mW, compares the self-reference light comb system that only has tens milliwatts that the high loss because of photonic crystal fiber causes, and the present invention has obvious advantage aspect output power.
Description of drawings
Embodiments of the present invention is further illustrated referring to accompanying drawing, wherein:
Fig. 1 is the general structure theory diagram of the embodiment of the invention;
Fig. 2 is the light channel structure schematic diagram of the embodiment of the invention;
Fig. 3 be obtain behind the difference frequency in the embodiment of the invention in infrared curve map;
Fig. 4 is the beat measurement CEO frequency spectrum figure of the embodiment of the invention;
Fig. 5 is the Alan's variance curve after the repetition frequency of the embodiment of the invention locks;
Fig. 6 is the Alan's variance curve behind the CEO Frequency Locking of the embodiment of the invention.
Embodiment
Fig. 1 is theory diagram according to an embodiment of the invention.As shown in Figure 1, adopt the 532nm single-frequency entirely to solidify continuously frequency multiplication Yttrium Orthovanadate laser instrument as pumping source, enter periodic quantity level Ti∶Sapphire oscillator behind the pump light process acousto-optic modulator (AOM), then the femtosecond pulse of oscillator output is told sub-fraction, receive the repetition frequency signal by the PIN pipe, and major part enters CEO from difference frequency measuring system (difference frequency crystal) measurement CEO frequency.Be divided into two parts through the light pulse after the beat measurement system, its mid-infrared light part is received by infrared avalanche photo diode (APD) and obtains the CEO frequency signal again, and visible light part is as the available light pulse output of light comb.In order to obtain the output of absolute stable light comb, the CEO electrical signal of the frequency that the repetition frequency signal that the PIN pipe is received and infrared APD receive is sent into respectively phase lock circuitry I and phase lock circuitry II, the 10MHz signal of external reference source output obtains suitable reference signal and also enters respectively phase lock circuitry I and phase lock circuitry II behind frequency synthesizer, through obtaining control signal after the phase demodulation filtering, and then reach the purpose of control CEO frequency by control AOM, and be installed in the purpose that a piezoelectric ceramics on the end mirror reaches the control repetition frequency by control.
In the present embodiment, the cycle magnitude femto second titanium jewel oscillator that is used for light spectrum reshaping is a kind of device that can directly export femtosecond pulse, the spectral width of the femtosecond pulse of its output is near an optical frequency-doubling journey, can cover the scope of 600nm-1000nm, spectral shape through shaping is M shape, repetition frequency is greater than 300MHz, carry out dispersion compensation through some chirped mirrors outside the chamber and a pair of wedge after, the pulsewidth of cycle magnitude femtosecond pulse is below 7fs.In an embodiment of the present invention, adopt the cycle magnitude femto second titanium jewel oscillator of light spectrum reshaping, and then by the CEO frequency from difference frequency commercial measurement femtosecond pulse, control on this basis repetition frequency and CEO frequency and obtain high repetition optical frequency com.Because above-mentioned oscillator is on the Chinese patent application basis of " the linear cavity titanium-doped sapphire laser of generation high repetition frequency few-cycle femtosecond pulses " (200810115910.9) (this application comprises in this application by reference in full), output coupling mirror is carried out unique plated film design, make through the transmitted spectrum behind the cycle magnitude femto second titanium jewel oscillator to be high, the middle low curve in both sides, thereby the wide light spectrum reshaping of directly the 7fs Ti∶Sapphire oscillator being exported is M shape.Thisly creatively the spectrum of femtosecond pulse is carried out shaping, the spectral component that participates in from difference frequency is enhanced, guaranteed to produce from difference frequency the acquisition of high s/n ratio CEO signal, thereby can will bring up to greater than more than the 400MHz based on the optical frequency com repetition frequency of difference frequency.
According to one embodiment of present invention, CEO comprises the monolithic nonlinear crystal from the difference frequency measuring system, and such as the PPLN crystal of doped with magnesia, this crystal is measured CEO frequency (f by the following method
Ceo): wide range cycle magnitude femto-second laser pulse is focused in the nonlinear crystal, and the long wave of femtosecond pulse part and shortwave part occur from the difference frequency effect in crystal, produce new f
CeoBe 0 infrared spectrum district, with the infrared spectrum composition mutual beat frequency of femtosecond pulse first-harmonic at this area overlapping, just can obtain the f of stable high s/n ratio
CeoSignal.In one embodiment, this CEO comprises from the difference frequency measuring system: two concave surface silver mirrors, a nonlinear crystal and an infrared fileter.Wherein, nonlinear crystal for example is the lithium niobate PP-MgO-LN of the accurate phase matching doped with magnesia in electric polarization cycle, and it is of a size of: 3 * 2 * 1mm, polarization cycle are 17.84 μ m or 11.21 μ m; Described infrared fileter for example is the long-pass infrared fileter that 1000nm or the above wavelength of 2000nm see through; The focal length of two concave surface silver mirrors is identical, and place with low-angle respectively, laser is all incided on the two concave surface silver mirrors with low-angle, and the spacing of two concave surface silver mirrors is the two focus length of the first concave surface silver mirror, nonlinear crystal is arranged on the focus place of the first concave surface silver mirror and the second concave surface silver mirror, and infrared fileter is arranged on the reflection output light path of nonlinear crystal to the second concave surface silver mirror output light path.Infrared APD is placed in the transmitted light path of infrared fileter.In one embodiment, the focal length of the first concave surface silver mirror and the second concave surface silver mirror is 25mm or 30mm or 35mm.
In above-mentioned light path, adopt based on phase-locked principle and make control f
RepAnd f
CeoThe circuit feedback system, to repetition frequency signal (f
Rep) and CEO frequency signal (f
Ceo) realize respectively feeding back.Particularly, the feedback circuit of repetition frequency signal is made of PIN pipe, phase lock circuitry and piezoelectric ceramics, a part of spectrum pulse by cycle magnitude femto second titanium jewel oscillator output is fed back to cycle magnitude femto second titanium jewel oscillator by the reception of PIN pipe by the phase lock circuitry I, can control f by the flexible change chamber length that is installed in the piezoelectric ceramics PZT on chamber mirror of oscillator like this
RepThe feedback circuit of CEO frequency signal is made of infrared APD, phase lock circuitry II and AOM, fed back to AOM by infrared APD reception by the phase lock circuitry II through a part of light pulse after the beat measurement system, can control f with the acousto-optic modulator AOM change pump light power that is installed in the pumping light path like this
CeoIn another embodiment, described optical frequency com also comprises a stable external reference source, described repetition frequency feedback circuit and CEO frequency feedback circuit are locked onto on this external reference source simultaneously, this reference source can for microwave atomic clocks such as caesium clock, hydrogen clock or rubidium clocks, also can be stable light clock.
Fig. 2 is light channel structure schematic diagram according to the above embodiment of the present invention.As shown in Figure 2, the monolithic optical frequency com of high stable high repetition frequency comprises cycle magnitude femto second titanium jewel oscillator, measures f from difference frequency
CeoDevice.Pump light is through AOM 01, through the mirror 02 of climbing light path is raised again, and then through one the turnover silver mirror 03 incide in the cycle magnitude femto second titanium jewel oscillator, wherein the electrical modulation frequency of AOM is 80MHz, make laser vertical incident plane of crystal during placement, fine setting AOM change incident angle in the strongest position of first-order diffraction light fixing AOM.Cycle, magnitude femto second titanium jewel oscillator was by pumping mirror 04, two plano-concave chirped mirrors 05,06, a titanium gem crystal 07, two plane chirped mirrors 08,09, a pair of wedge 10,11 and plane output coupling mirrors 12 consist of, wherein the focal length of pumping mirror 04 is 50mm, and bore is 25.4mm; Crystal 07 is the ti sapphire crystal of cut at Brewster angle, is of a size of 3*2.8*1.85mm; Plano-concave chirped mirror 05,06 for radius-of-curvature be 50mm, bore is 12.7mm, thickness is the fused quartz glass material of 6.35mm, filming parameter is: concave surface is coated with the double-colored deielectric-coating of and 700-950nm wave band anti-reflection to the 503-535nm wave band high anti-(so-called " high anti-" is reflectivity〉99%), and 680-940nm wave band 2nd order chromatic dispersion (GVD)-50fs2 is provided, and the back side is coated with the anti-reflection film of 503-535nm wave band; Plane chirped mirror 08,09 filming parameter are identical, all high anti-to the 650-980nm wave band, the 650-980nm wave band provides 2nd order chromatic dispersion-40fs2, chirped mirror 08 is thickness 6.35mm, the fused silica chip of bore 25.4mm, but chirped mirror 09 thickness 2mm, bore is 6mm, be installed in a column and be about on the PZT of 5cm, be used for changing the long control in chamber repetition frequency; A pair of wedge 10,11 is 30*20mm, and top angle is 2 ° 48 ', and thinnest part is the fused silica chip of 200 μ m.Above-mentioned cycle magnitude femto second titanium jewel oscillator is from structure, component parameters is all identical with " producing the titanium-doped sapphire laser of high repetition frequency few-cycle femtosecond pulses " (application number is 200810115910.9) of patent applied for control method to installation method, but in order to obtain the shaping spectrum of M shape, output coupling mirror has been made particular design.Output coupling mirror 12 is the fused silica chip of bore 12.7mm, thickness 1mm, and it is 10% deielectric-coating that plated film is designed to transmitance in 750nm ~ 850nm wave band.Be installed in the chirped mirror 09 on the PZT, for the bearing load that cooperates PZT has adopted all less eyeglass of size and thickness with weight reduction, simultaneously a wedge is installed on the translation stage, can help the position of coarse adjustment locking Ex-CEO frequency, receive a small amount of transmitted light at PIN of chirped mirror 08 rear placement and obtain the repetition frequency signal.
The laser pulse that transmits from output coupling mirror 12 is again through a turnover silver mirror 13, be reflected to outside a pair of chamber chirped mirror on 14,15 and carry out three low-angles reflections, to obtain enough chromatic dispersion compensation quantities, chirped mirror is coated with 580-1020nm wave band high-reflecting film to 14,15, and the 620-1000nm wave band provides 2nd order chromatic dispersion-50fs
2Then laser is reflected to outside a pair of chamber on the wedge 16,17, wedge 10 in wedge parameter and the chamber, 11 identical, wedge 16,17 inserts in the laser optical path with Brewster angle, and two parallel placements of wedge, top relative, one of them wedge 16 is fixing, another one wedge 17 is contained on the one dimension translation stage, the translation stage moving direction is vertical with light path, can change the insertion amount of wedge 17 by mobile translation stage, and then regulates dispersion measure.Incide on first concave surface silver mirror 19 through turnover silver mirror 18 through the laser behind the wedge, concave surface silver mirror 19 focal lengths are 25mm, assurance is incided the first concave surface silver mirror 19 from the laser that wedge penetrates with low-angle, and its concave surface is on wedge 17 output light paths, the focal length of the second concave surface silver mirror 20 also is 25mm, the concave surface of its concave surface and the first concave surface silver mirror 19 is staggered relatively, distance between two minute surfaces is approximately 50mm, the PPLN crystal 21 of a rectangular parallelepiped doped with magnesia is placed on the focus place between the first concave surface silver mirror 19 and the second concave surface silver mirror 20, the polarization cycle of crystal 21 is 17.84 μ m, logical optical thickness is 2mm, logical light face size is 3*1mm, the Laser Focusing that reflects with low-angle from the first concave surface silver mirror 19 is on crystal 21, position for the fine tuning crystal, crystal can be installed on the one dimension translation stage, translation stage moving direction and light path parallel, one chirped mirror 22 is set on the reflection output light path of the second concave surface silver mirror 20, it is coated with 580-1020nm wave band high-reflecting film, vertical reflection light is as the available output light of optical frequency com, place a level crossing 23 that is coated with the 700nm-800nm high-reflecting film at transmitted light path, place PIN24 pipe on the reflected light path, be used for monitoring repetition frequency signal, the transmitted light that sees through level crossing 23 incides the silver mirror 25 that pair of parallel is placed, the light path of transferring on 26, infrared fileter 27, condenser lens 28 and infrared APD29 are successively placed in the turnover, the parameter of described infrared fileter is to pass through more than the 1100nm, below cut-off, condenser lens 28 focal lengths are 30mm, and material adopts the good calcium fluoride of infrared light permeability.
The repetition frequency that at last PIN24 and APD29 is received and CEO frequency signal adopt respectively the phase-locked loop circuit system lock of two covers on same external microwave reference source, and the reference source that the present embodiment uses is that the 100s degree of stability is 10
-12Rubidium atomic clock, the repetition frequency after the locking is 350MHz, the CEO frequency is 20MHz.
Fig. 3 is the M shape curve of spectrum that cycle magnitude titanium precious stone laser oscillator is directly exported in the present embodiment, and wherein red dotted line is the plated film curve of the output coupling mirror of particular design.Fig. 4 is the CEO frequency signal that is recorded to by frequency spectrograph after APD receives in the present embodiment, and signal to noise ratio (S/N ratio) is up to 45dB.Fig. 5 is Alan's variance curve of the rear repetition frequency of locking in the present embodiment, 9 hours locking time.Fig. 6 is Alan's variance curve of the rear CEO frequency of locking in the present embodiment, 9 hours locking time.
In sum, optical frequency com of the present invention is mainly by the cycle magnitude Ti∶Sapphire oscillator of light spectrum reshaping, the feedback circuit installation composition that the monolithic nonlinear crystal is measured carrier envelope phase shift frequency device and controlled based on phase-locked principle from difference frequency.Wherein, use cycle magnitude femto second titanium jewel oscillator output high repetition frequency, wide range, the following pulsewidth femtosecond pulse of 7fs of light spectrum reshaping; Use the monolithic nonlinear crystal to measure femtosecond pulse carrier envelope phase shift frequency from difference frequency; Use the circuit feedback technique that repetition frequency and carrier envelope phase shift frequency are locked onto on stable external microwave reference source or the optics frequency marking simultaneously.The present invention has compact equipment; The characteristics such as locking time is long, repetition frequency is high, the output available horsepower is high, phase noise is little can be mainly used in the optical frequency absolute measurement, consist of in the scientific researches such as light clock, Ah second's generation.
Although the present invention is made specific descriptions with reference to the above embodiments, but for the person of ordinary skill of the art, should be appreciated that and to make amendment based on content disclosed by the invention within spirit of the present invention and the scope or improve not breaking away from, these modifications and improving all within spirit of the present invention and scope.
Claims (10)
1. optical frequency com, comprise: pumping source, cycle magnitude femto second titanium jewel oscillator, from difference frequency measurement mechanism and feedback circuit, wherein, the pump light that is produced by pumping source enters described cycle magnitude femto second titanium jewel oscillator, and this cycle magnitude femto second titanium jewel oscillator is the femtosecond spectrum pulse of the cardinal principle M shape that both sides are high, the centre is low for generation of shape; The part of this femtosecond spectrum pulse be transported to described from the difference frequency measurement mechanism measuring the carrier envelope phase shift frequency (CEO frequency) of this spectrum pulse, another part forms the repetition frequency signal and is transferred back cycle magnitude femto second titanium jewel oscillator through described repetition frequency feedback circuit.
2. optical frequency com according to claim 1, it is characterized in that, be provided with the output coupling mirror of plated film in the described cycle magnitude femto second titanium jewel oscillator, export the femtosecond spectrum pulse of described cardinal principle M shape through the output coupling mirror of this plated film, it is 10% deielectric-coating that described plated film is designed in 750nm ~ 850nm wave band transmitance.
3. optical frequency com according to claim 1, it is characterized in that, described repetition frequency feedback circuit is made of PIN pipe, the first phase lock circuitry and the piezoelectric ceramics that is arranged in the cycle magnitude femto second titanium jewel oscillator, wherein received by the PIN pipe by described a part of spectrum pulse of cycle magnitude femto second titanium jewel oscillator output and feed back in the cycle magnitude femto second titanium jewel oscillator by the first phase lock circuitry, the flexible change chamber length by being installed in the piezoelectric ceramics in the cycle magnitude femto second titanium jewel oscillator is to control this repetition frequency.
4. optical frequency com according to claim 1, also comprise and be arranged on described CEO frequency feedback circuit after difference frequency measurement mechanism light path, wherein the infrared light by described spectrum pulse from difference frequency measurement mechanism output partly forms the CEO frequency signal, and this signal feeds back to the acoustooptical modulator that is arranged between pumping source and the cycle magnitude femto second titanium jewel oscillator to control this CEO frequency through CEO frequency feedback circuit.
5. optical frequency com according to claim 4, it is characterized in that, described CEO frequency feedback circuit is made of infrared avalanche photodide, the second phase lock circuitry and acoustooptical modulator, and wherein said infrared light part is received by infrared avalanche photodide and feeds back to acoustooptical modulator by the second phase lock circuitry.
6. optical frequency com according to claim 4 is characterized in that, by the available light pulse output as the light comb of the visible light part of described spectrum pulse from difference frequency measurement mechanism output.
7. optical frequency com according to claim 1, it is characterized in that, describedly comprise two concave surface silver mirrors and a nonlinear crystal from the difference frequency measurement mechanism, the part of the spectrum pulse after the described shaping focuses on by concave surface silver mirror wherein and is coupled in the nonlinear crystal, and then through another piece concave surface silver mirror collimation output.
8. optical frequency com according to claim 7 is characterized in that, described nonlinear crystal is selected the lithium columbate crystal in accurate phase matching electric polarization cycle.
9. optical frequency com according to claim 4 is characterized in that, described repetition frequency feedback circuit and CEO frequency feedback circuit are locked onto external microwave reference source simultaneously,
10. optical frequency com according to claim 9 is characterized in that, described external microwave reference source is microwave atomic clock or light clock.
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| CN103424194B (en) * | 2013-08-13 | 2015-12-09 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of measuring method of frequency stability of femtosecond laser frequency comb and device |
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| WO2016029981A1 (en) * | 2014-08-25 | 2016-03-03 | Ludwig-Maximilians- Universität München | Method and device for cavity-enhanced broadband intrapulse difference frequency generation |
| EP2990866A1 (en) * | 2014-08-25 | 2016-03-02 | Ludwig-Maximilians-Universität München | Method and device for cavity-enhanced broadband intrapulse difference frequency generation |
| US10042231B2 (en) | 2014-08-25 | 2018-08-07 | Max-Planck-Gesellschaft Zur Foerderung Der Wissenschaften E.V. | Method and device for cavity-enhanced broadband intrapulse difference frequency generation |
| CN106019763A (en) * | 2016-05-10 | 2016-10-12 | 西北大学 | All-fiber continuous light and optical frequency comb locking device |
| CN106019763B (en) * | 2016-05-10 | 2018-10-16 | 西北大学 | A kind of locking device of all -fiber continuous light and optical frequency com |
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| CN107565360A (en) * | 2017-08-21 | 2018-01-09 | 华中科技大学 | A kind of kerr lens mode locking ti sapphire laser of diode-end-pumped |
| CN109193329A (en) * | 2018-10-17 | 2019-01-11 | 西安电子科技大学 | A kind of kerr lens Self-Mode-Locked Ti: Sapphire Laser based on blue light laser diode pumping |
| CN110120622A (en) * | 2019-05-20 | 2019-08-13 | 西安电子科技大学 | A kind of 10 femtosecond Ti:Sapphire oscillator of the Asia that laser diode directly pumps |
| CN111722450A (en) * | 2020-06-03 | 2020-09-29 | 华东师范大学 | Method for generating intermediate infrared optical frequency comb |
| WO2024011967A1 (en) * | 2022-07-13 | 2024-01-18 | 广东大湾区空天信息研究院 | Optical frequency comb generating device |
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