CN101599610B - Precise active synchronization unit of different ultrashort pulse lasers - Google Patents
Precise active synchronization unit of different ultrashort pulse lasers Download PDFInfo
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Abstract
The invention discloses a precise active synchronization unit of different ultrashort pulse lasers, comprising a picoseconds laser, a femto-second laser, a synchronous control system and a light path adjusting system, wherein the picoseconds laser is used for generating picoseconds laser; the femto-second laser is used for generating femto-second laser; the synchronous control system is used for converting light signals of two beams of laser into electric signals and outputting a control signal of the light path adjusting device to realize the active synchronization of the two lasers and comprises a plurality of high-speed electrophotonic detectors and at least one phase-locked loop circuit; and the light path adjusting system comprises a platform in the femto-second laser and a piezoelectric actuator and is used for adjusting the length of an oscillating cavity of the femto-second laser so as to be matched with the picoseconds laser. The invention can solve the problem of low synchronization precision of the active synchronization unit of the prior ultrashort pulse laser by improving a synchronization control system in the active synchronization unit of the prior ultrashort pulse laser.
Description
Technical field
The present invention relates to a kind of synchronizer of laser, particularly a kind of precise active synchronization unit of different ultrashort pulse lasers.
Background technology
Ultrafast laser has important use and is worth in fields such as physics, chemistry, biology, information and advanced manufacturing industries.Because the time response that it is extremely short, therefore the transient performance " record " of the inner atom of material, molecule can be got off, so be not only the important means that people obtain new discovery at " time " category, set up new theory, and can also be accurate, exactly material is carried out processing on atom, the molecular level.1999, U.S. scientist A.H.Zewail because of the initiative work of adopting femto-second laser pulse research Chemical Kinetics obtained should year Nobel chemistry Prize [document 1, A.H.Zewail, " Femtochemistry-Atomic-scale dynamics of the chemicalbond using ultrafast laserg ", Angewandte chemie, Invited, InternationalEdition 39 2586 (2000) Nobel paper].But, for the application study on this basis, class forward position on the broad sense more, the effect of single bundle ultrafast laser be have very much circumscribed.Such as a typical ultrafast pumping-detection is tested [document 2, G.M.Gale, G.Gallot, F.Hache, N.Lascoux, S.Bratos and J-Cl.Leicknam, " Femtosecond Dynamics ofHydrogen Bonds in Liquid Water:A Real Time Study " Phys.Rev.Lett.821068 (1999)], just need the synchronous ultrafast laser pulse of two bundles to finish, wherein a branch of (pump light) is used for the pump excitation research object, and another bundle (detection light) is used for surveying this research object transient performance that the back shown that is excited.Generally speaking, characteristic requirement to the synchronous ultrafast laser pulse of this two bundle is different, but owing to often do not possess desirable synchronous laser in the reality, so people often adopt the alternative scheme that single bundle ultrafast laser is divided into two bundles, wherein a branch of as pump light, another Shu Zuowei surveys light.The two-beam that even now obtains is synchronous, power may be also different, but the parameter of keys such as its centre wavelength, pulsewidth is identical, therefore resulting experimental phenomena has only reflected the local rule of material, and can not disclose comprehensive essence, so have great importance for the synchronous research of the different ultrafast laser of characteristic.This synchronous laser all has application aspect a lot of at present, for example to the coherent control of atom, molecule, needs the acting in conjunction of two bundles or the synchronous ultrafast laser of multi beam; The ultrafast electromagnetic radiation of infrared and even THz wave band in needed in national defense applications such as atmospheric environment measurement, electrooptical countermeasures and guidance, a feasible program is to adopt two bundle wavelength different synchronous ultrafast laser pulse carrying out difference frequencies; The attitude of tangling that needs in the quantum cryptography communication also can be by synchronous femtosecond laser acquisition; Two bundle femtosecond lasers are carried out phase-locked, can realize the relevant synthetic of laser.This shows that ultrafast laser is with a wide range of applications synchronously.
So-called being meant synchronously locks two repetition rates of restrainting ultrafast mode-locked laser pulse.Free-running its repetition rate of ultrafast laser pulse is changing usually, the constant or variation simultaneously with regard to the repetition rate locking that needs to adopt certain mode to make two bundle laser synchronously.
Realize that the synchronous mode of ultrafast mode-locked laser is divided into passive and synchronous and active synchronization, two passive and synchronous stand lock mode lasers are coupled by a nonlinear crystal, this crystal is placed in the chamber, their laser beams separately all pass through this crystal and overlap, and two beam pulses are realized the passive and synchronous of two lasers by mutual position modulation (XPM) in crystal.This piece bimorph crystal both can be the gain media of a laser wherein, also can be to remove gain media the 3rd crystal in addition, the latter can make two more stable synchronizing pulse train (documents 3 of laser output, patent name: high accuracy femtosecond laser simultaneous techniques and device, publication number: CN1555112, the open date: 2004.12.15).Because the response speed of bimorph crystal nonlinear interaction is fast, modulation accuracy height to the laser pulse time error, thereby passive and synchronous technology has very high synchronization accuracy from the beginning, one of advantage of this technology is that the method for acquisition high-precise synchronization is simple and reliable, the 2nd, the time of keeping synchronously long (can keep reaching 24 hours high-precise synchronization), these two advantages all are that the active synchronization technology is incomparable.Yet passive and synchronously also exist certain defective: two at first passive and synchronous lasers can not independently be opened from the space fully, and this has limited their many application; Secondly, two passive and synchronous lasers be owing to must be coupled by a crystal, thereby light path is complicated and be difficult to regulate, if want synchronous mode-locked laser more than three or three, just become very difficult with passive and synchronous mode.
The active synchronization mode be utilize the chamber long (being pulse repetition frequency) of electronics phase-locked loop (PLL) locked laser thus realize more than two or two mode-locked laser synchronously.The pulse repetition frequency information of laser (being chamber long letter breath) is received and is converted into the signal of telecommunication by photodetector and is input in the phase-locked loop circuit, providing feedback control signal by it then, to go to lock the chamber of two lasers long, thus realize their output laser pulses synchronously.The locking control that laser chamber is long is finished by piezo-activator (PZT), and the phase-locked loop circuit output voltage signal is carried on the PZT, can change its elongation, thereby realizes the adjusting long to laser chamber.But the synchronization accuracy of active synchronization is relatively low.
Summary of the invention
At the problem that prior art exists, the purpose of this invention is to provide the active synchronization device of the high different ultrashort pulse lasers of a kind of synchronization accuracy.
For achieving the above object, the invention provides a kind of precise active synchronization unit of different ultrashort pulse lasers, comprise a picosecond laser, a femto-second laser, synchronous control system and light path regulating device, described picosecond laser is used to produce picosecond laser, described femto-second laser is used to produce femtosecond laser, described synchronous control system is used for the light signal of two bundle laser is converted into the signal of telecommunication and exports the active synchronization that the control signal that drives described light path regulating device realizes two lasers, described synchronous control system comprises first high-speed photodetector, second high-speed photodetector, at least one phase-locked loop circuit, described light path regulating device comprises translation stage and the piezo-activator that is positioned at femto-second laser, and the chamber length in vibration chamber that is used for regulating described femto-second laser is to cooperate described picosecond laser.
Further, described synchronous control system comprises that first phase-locked loop circuit and described first phase-locked loop circuit of second phase-locked loop circuit comprise first bandpass amplifier, second bandpass amplifier, first frequency divider, second frequency divider, adjustable time delay, first digital phase discriminator, first second-order filter circuit, and described first high-speed photodetector connects first bandpass amplifier, first frequency divider, adjustable time delay, first digital phase discriminator, first second-order filter circuit, piezo-activator successively; Described second high-speed photodetector connects second bandpass amplifier, second frequency divider, first digital phase discriminator successively;
Described second phase-locked loop circuit comprises first band pass filter, second band pass filter, standard-frequency signal generator, first frequency mixer, second frequency mixer, the 3rd bandpass amplifier, the logical amplifier of the four-tape, second digital phase discriminator, second second-order filter circuit; Described first high-speed photodetector connects first band pass filter, first frequency mixer, the 3rd bandpass amplifier, second digital phase discriminator, second second-order filter circuit, piezo-activator successively; Described second high-speed photodetector connects second band pass filter, second frequency mixer, the logical amplifier of the four-tape, second digital phase discriminator successively; Described standard-frequency signal generator connects first frequency mixer, second frequency mixer respectively.
Further, described synchronous control system also comprises the 3rd phase-locked loop circuit, the 3rd photodetector, described the 3rd phase-locked loop circuit comprises D.C. regulated power supply, voltage stabilizing chip, potentiometer, subtracter, accurate amplifier, loop filter, adjustable potentiometer, and described D.C. regulated power supply connects second second-order filter circuit in voltage stabilizing chip, potentiometer, subtracter, accurate amplifier, loop filter, adjustable potentiometer, second phase-locked loop circuit successively; Described the 3rd photodetector connects described subtracter.
Further, described light path regulating device also comprises electronic computer, and the translation stage in described electronic computer and the described femto-second laser is electrically connected, is used for controlling the mobile of translation stage.
The present invention is by the synchronous control system in the active synchronization device that has improved existing ultra-short pulse laser, specifically phase-locked loop circuit has wherein been made improvement, increase a plurality of phase-locked loop circuits, made the precise active synchronization unit of the different ultrashort pulse lasers that the present invention proposes to overcome the low problem of synchronization accuracy of the active synchronization device of existing ultra-short pulse laser.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail:
Fig. 1 is the schematic diagram of the embodiment of the invention 1;
Fig. 2 is the principle assumption diagram of the femto-second laser of the embodiment of the invention 1;
Fig. 3 is the principle assumption diagram of first phase-locked loop circuit of the embodiment of the invention 1;
Fig. 4 is the principle assumption diagram of second phase-locked loop circuit of the embodiment of the invention 1;
Fig. 5 is the schematic diagram of the embodiment of the invention 2;
Fig. 6 is the principle assumption diagram of the 3rd phase-locked loop circuit of the embodiment of the invention 2;
Fig. 7 is the schematic diagram of the embodiment of the invention 3;
Fig. 8 is for after the present invention starts synchronously with first phase-locked loop circuit, the sync waveform that oscilloscope collects;
Fig. 9 spectral intensity curve that collect for spectrometer and frequency laser.
Embodiment
Embodiment 1:
As shown in Figures 1 to 4, the precise active synchronization unit of a kind of different ultrashort pulse lasers that present embodiment provides, comprise a picosecond laser 1, a femto-second laser 2, synchronous control system and light path regulating device, picosecond laser 1 is used to produce picosecond laser, femto-second laser 2 is used to produce femtosecond laser, synchronous control system is used for the light signal of two bundle laser is converted into the signal of telecommunication and exports the active synchronization that the control signal that drives light path regulating device realizes two lasers, synchronous control system comprises first high-speed photodetector 101, second high-speed photodetector 102, first phase-locked loop circuit 3, second phase-locked loop circuit 4, light path regulating device comprises the translation stage 9 and piezo-activator 6 that is positioned at femto-second laser 2, and the chamber length in vibration chamber that is used for regulating femto-second laser 2 is to cooperate picosecond laser 1.The first glass substrate a, the second glass substrate b among Fig. 1 are the glass substrate that does not have plated film.
As shown in Figure 2, condenser lens 001 places on the adjusting bracket of scalable lifting and position, the left and right sides, and adjusting bracket is placed on the translation stage of 40 * 40mm.The first plano-concave total reflective mirror 003 is positioned on the adjustable micropositioning stage of the bidimensional of scalable pitching and angle, and the second plano-concave total reflective mirror 004 is positioned on the translation stage of the adjustable micropositioning stage of bidimensional and 40 * 40mm, and the relative distance of two plano-concave total reflective mirrors is about 105mm.Gain media is a titanium gem crystal 002, be positioned on the horizontal rotating table, and rotating platform is placed on the translation stage of 40 * 40mm, the water-cooled circulation is inserted with rubber tube in the two ends of rotating platform, and titanium gem crystal 002 is placed on the focus of the first plano-concave total reflective mirror 003, the second plano-concave total reflective mirror 004 with Brewster's angle.The position of regulating condenser lens 001 guarantees that pumping laser just focuses on the center of titanium gem crystal 002.The first plane total reflective mirror 005, the second plane total reflective mirror 006, the 3rd plane total reflective mirror 007 and flat output mirror 009 are placed respectively on the adjustable micropositioning stage of bidimensional, total reflective mirror 8 usefulness ultraviolet glue in small-bore plane are fixed in the femto-second laser 2 on the piezo-activator 6, the other end of piezo-activator 6 is fixed on the adjustable micropositioning stage of bidimensional with ultraviolet glue, micropositioning stage places on the motorized precision translation stage 9, and the maximum displacement of motorized precision translation stage 9 is 2cm.The galianconism that the position of the first plane total reflective mirror 005, small-bore plane total reflective mirror 8 is used to regulate the vibration chamber is about and is 85cm, and long-armed being about that the position of the second plane total reflective mirror 006, the 3rd plane total reflective mirror 007 and flat output mirror 009 is used to regulate the vibration chamber is 135cm.First quartz prism 010, second quartz prism 011 are placed with Brewster's angle, they are opposite on the translation stage of horizontal rotating table and 40 * 40mm, and insertion vibration chamber is long-armed, optical path length between the prism is about 70cm, and the insertion amount that changes first quartz prism 010, second quartz prism 011 can change the output pulse width and the spectrum of femtosecond laser.The whole light height of femto-second laser is 6cm.
Regulate small-bore plane total reflective mirror 8 and flat output mirror 009, incident ray is returned along former road, can realize the continuous oscillation of titanium precious stone laser, further optimize the focal position of the second plano-concave total reflective mirror 004 in titanium gem crystal 002, can realize the locked mode running, laser can be realized by means of laterally moving of second quartz prism 011 from continuous redirect to locked mode.
As shown in Figure 1, synchronous control system comprises first phase-locked loop circuit 3 and second phase-locked loop circuit 4.As shown in Figure 3, first phase-locked loop circuit 3 comprises that first bandpass amplifier 103, second bandpass amplifier 104, first frequency divider 105, second frequency divider 106, adjustable time delay 107, first digital phase discriminator 108, first second-order filter circuit, 109, the first high-speed photodetectors 101 connect first bandpass amplifier 103, first frequency divider 105, adjustable time delay 107, first digital phase discriminator 108, first second-order filter circuit 109, piezo-activator 6 successively; Second high-speed photodetector 102 connects second bandpass amplifier 104, second frequency divider 106, first digital phase discriminator 108 successively.
First high-speed photodetector 101, second high-speed photodetector 102 receives the locked mode signal of picosecond laser and femtosecond laser, the output electric pulse sequence, respectively through two identical bandpass amplifiers, first bandpass amplifier 103, second bandpass amplifier 104, only amplify 68MHz fundamental frequency signal wherein, signal after the amplification is then respectively by first frequency divider 105, second frequency divider 106 changes the low-frequency square-wave signal of 265.6kHz into through 256 frequency divisions, wherein from that road signal of picosecond laser through an adjustable time delay 107, output signal with import first digital phase discriminator 108 simultaneously from the signal of femtosecond laser, amplify through first second-order filter circuit, 109 back integrations from the error signal of its output, be loaded at last on the piezo-activator 6 in the femto-second laser 2.
As shown in Figure 4, second phase-locked loop circuit comprises first band pass filter 203, second band pass filter 204, standard-frequency signal generator 205, first frequency mixer 206, second frequency mixer 207, the 3rd bandpass amplifier 208, the logical amplifier 209 of the four-tape, second digital phase discriminator 210, second second-order filter circuit 211; First high-speed photodetector 101 connects first band pass filter 203, first frequency mixer 206, the 3rd bandpass amplifier 208, second digital phase discriminator 210, second second-order filter circuit 211, piezo-activator 6 successively; Second high-speed photodetector 102 connects second band pass filter 204, second frequency mixer 207, the logical amplifier 209 of the four-tape, second digital phase discriminator 210 successively; Standard-frequency signal generator 205 connects first frequency mixer 206, second frequency mixer 207 respectively.
The first smooth high-speed photodetector 101 receives the locked mode signal of picosecond laser, the output electric pulse sequence, through first band pass filter 203, (12 * 68MHz=816MHz) signal extractions are come out with its 12nd subharmonic, be input to RF (the radio frequency of first frequency mixer 206, radio frequency) end, the 816MHz standard-frequency signal that while standard-frequency signal generator 205 sends is input to LO (the local oscillator of this frequency mixer, local oscillator) end, IF (intermediate frequency from this frequency mixer, intermediate frequency) low frequency signal about end output 300kHz, this signal is back as importing second digital phase discriminator 210 with reference to signal through the 3rd bandpass amplifier 208.Second high-speed photodetector 102 receives the locked mode signal of femtosecond laser, the output electric pulse sequence, be input in second digital phase discriminator 210 through after the same signal processing, the error signal of second digital phase discriminator, 210 outputs is amplified through second second-order filter circuit, 211 back integrations again, is loaded at last on the piezo-activator 6.
The repetition rate of first phase-locked loop circuit 3 is 68MHz, the repetition rate of second phase-locked loop circuit 4 is 816MHz, they contrast the pulse repetition frequency of two lasers simultaneously, all can produce the voltage signal of drive pressure electric actuator 6, thereby regulate the repetition rate of femto-second laser.But the same time only has a kind of signal loading on piezo-activator 6, comes the output laser pulse of synchronous two lasers.The synchronization accuracy that the phase-locked loop circuit of this two cover is realized has very big difference, plays a different role in synchronizing process, complements each other.
If only adopt the phase-locked loop circuit of 68MHz to carry out synchronously, synchronization accuracy is lower, and tens psecs are arranged approximately.But this PLL has an advantage, exactly when drive with it PZT realize two lasers synchronously after, the adjustable time delay in the regulation loop can change the relative time position of femtosecond and picosecond laser pulse, adjustable range can reach for tens nanoseconds; And after utilizing this PLL to start synchronously, relative time position between two kinds of laser pulses is fixed basically, this is very favorable for utilizing synchronous laser to produce and testing frequently, because need to regulate the relative time position of two bundle laser pulses in the experimentation.
If only adopt the phase-locked loop circuit of 816MHz to carry out synchronously, synchronization accuracy can reach a hundreds of femtosecond.But, though this PLL has the higher synchronous precision, but it but has a shortcoming, be exactly utilize at every turn it drive PZT start two lasers synchronously after, relative time position between two laser output laser pulses is uncertain, will inevitably give like this to utilize synchronous laser to produce and adjusting frequently bring certain difficulty.
Two cover PLL respectively have pluses and minuses, in experiment, should be used in combination, we find, if drive PZT with 68MHz PLL earlier, after starting synchronously, rapidly the drive signal of switching PZT is to 816MHz PLL, after starting once more synchronously, and the drive signals of relative time position on PZT of two bundle laser pulses can change hardly before and after switching (is that the oscilloscope of 5GHz does not observe variation with sample frequency).Therefore when utilizing synchronous laser to carry out and frequently to test, just can determine that with 68MHz PLL two restraint the cardinal principle relative time position between the laser pulses earlier, keep high-precise synchronization between the pulse with 816MHz PLL again.
Embodiment 2:
As shown in Figure 5 and Figure 6, the synchronous control system of the precise active synchronization unit of the different ultrashort pulse lasers that present embodiment provides removes first phase-locked loop circuit 3 with embodiment 1, outside second phase-locked loop circuit 4, also comprise the 3rd phase-locked loop circuit 5, the 3rd photodetector 301, the 3rd phase-locked loop circuit 5 comprises D.C. regulated power supply 306, voltage stabilizing chip 307, potentiometer 308, subtracter 302, accurate amplifier 303, loop filter 304, adjustable potentiometer 305, D.C. regulated power supply 306 connects voltage stabilizing chip 307 successively, potentiometer 308, subtracter 302, accurate amplifier 303, loop filter 304, adjustable potentiometer 305, on second second-order filter circuit 211 of second phase-locked loop circuit 4; The 3rd photodetector connects subtracter 302.
The 3rd phase-locked loop circuit 5 utilizes and the frequency light signal is done feedback, receive by the 3rd photodetector 301 through the 3rd glass substrate c reflection back that does not have plated film with frequency laser, the signal of telecommunication of output produces in subtracter 302 with by D.C. regulated power supply 306, after the 307 further voltage stabilizings of voltage stabilizing chip, a direct current voltage signal that obtains through potentiometer 308 dividing potential drops subtracts each other again, input loop filter 304 after amplifying 5 times approximately through accurate amplifier 303 again, input second phase-locked loop circuit 4 after voltage signal process adjustable potentiometer 305 dividing potential drops of its output is carried on second second-order filter circuit 211 wherein.
First phase-locked loop circuit and second phase-locked loop circuit are opened simultaneously, receive the two-way laser pulse simultaneously with a photodetector (not shown), are observed the light signal that receives by the oscilloscope (not shown).Earlier with first phase-locked loop circuit, 3 drive pressure electric actuators, after starting synchronously, waveform as shown in Figure 8 can appear on the oscilloscope, the height wave sequence is represented two bundle laser pulses respectively, if two pulses do not overlap, then regulate the adjustable time delay 107 in this phase-locked loop circuit, till two row impulse waveforms on the oscilloscope coincide together.Thereafter, switch driving voltage on the piezo-activator 6 rapidly to second phase-locked loop circuit 4, after starting once more synchronously, two row pulses on the oscilloscope still can keep overlapping.
Utilize synchronous femto-second laser 2 and picosecond laser 1 generation and each element frequently as shown in Figure 5, concrete parameter and installation requirement that element is selected are as follows:
Two plane total reflective mirrors are formed the device 400 of climbing, and are coated with the deielectric-coating that under 45 ° of incidence angles 1064nm is all-trans, and after the laser of picosecond laser 1 output reflected via the device of climbing, the light height was increased to 6cm.The focal length of second condenser lens 401, the 3rd condenser lens 402 is 10cm, places on the adjusting bracket of scalable lifting and position, the left and right sides, and adjusting bracket is placed on the translation stage of 40 * 40mm.Second condenser lens 401 is coated with the anti-reflection film of 1064nm, and the 3rd condenser lens 402 is coated with the anti-reflection film of 750nm-850nm wave band.Siping City's face total reflective mirror 403, the 5th plane total reflective mirror 404, the 6th plane total reflective mirror 405, the 7th plane total reflective mirror 406 are positioned on the adjustable micropositioning stage of bidimensional, the 8th plane total reflective mirror 407, the 9th plane total reflective mirror 408 are positioned on the adjustable micropositioning stage of bidimensional, and micropositioning stage are placed on the translation stage.Wherein Siping City's face total reflective mirror 403 is coated with the deielectric-coating that under 45 ° of incidence angles 1064nm is all-trans, and the 5th plane total reflective mirror 404, the 6th plane total reflective mirror 405, the 7th plane total reflective mirror 406, the 8th plane total reflective mirror 407, the 9th plane total reflective mirror 408 are coated with the deielectric-coating that under 45 ° of incidence angles the 750nm-850nm wave band is all-trans.Nonlinear crystal 10 is BBO (β-barium borate, a beta barium borate) crystal, by 25.4 ° of cuttings of a class phase matching angle, is of a size of 4 * 4 * 2mm, and nonlinear crystal 10 is positioned on the horizontal rotating table.Regulate the 6th plane total reflective mirror 405, the 8th plane total reflective mirror 407, the 9th plane total reflective mirror 408 and make that the direction of femtosecond laser transmission is parallel with the direction of translation stage displacement, regulate Siping City's face total reflective mirror 403 and make the laser of picosecond laser 1 output incide the center of nonlinear crystal 10, regulate the 5th plane total reflective mirror 404, the 7th plane total reflective mirror 406 makes the laser of femto-second laser output incide the center of nonlinear crystal 10.The position of regulating second condenser lens 401 guarantees that picosecond laser just focuses on the center of nonlinear crystal 10, the position of regulating the 3rd condenser lens 402 guarantees that femtosecond laser just focuses on the center of nonlinear crystal 10, and makes the focus of two bundle laser overlap in nonlinear crystal 10.After realizing two bundle laser high-precision active synchronization by the road 4 of first phase-locked loop circuit 3 and second phase-locked loop, displacement and the frequency laser of regulating translation stage will produce, and the spectral intensity curve that is collected by spectrometer as shown in Figure 9.Produce and frequency laser after start that 5, two lasers of the 3rd phase-locked loop circuit still keep synchronously and increase with the power stability of frequency laser.
The purpose of adding the 3rd phase-locked loop circuit 5 is in order further to improve the time error resolution of 210 pairs of laser pulses of digital phase discriminator.After the phase-locked loop circuit of three covers was all realized running well, synchronization accuracy can be brought up to tens femtoseconds by a hundreds of femtosecond.
Embodiment 3:
As shown in Figure 7, the precise active synchronization unit of the different ultrashort pulse lasers that present embodiment provides is except that the structure with embodiment 2, light path regulating device also comprises electronic computer 7, and the translation stage 9 in electronic computer 7 and the femto-second laser is electrically connected, is used for controlling the mobile of translation stage 9.Electronic computer 7 is monitoring the long variation in the relative chamber of two lasers constantly, it compensates the long change of laser chamber that causes because of factors such as external environment variations at any time by the displacement of accurate control translation stage 9, synchronously in case start, two lasers can keep synchronously stable exporting with frequency laser being arranged all the time always.
Adding electronic computer control in real time is the time of keeping synchronously in order to improve.If there is not electronic computer to control in real time, the time of keeping synchronously is that dozens of minutes is to several hrs; After realizing real time computer control, the time of keeping synchronously can reach more than tens of hours.
In the various embodiments described above, picosecond laser can be any commercial ultrashort pulse laser or any self-built ultrashort pulse laser that is operated in stable state; Femto-second laser can be the self-built arbitrarily long controlled ultrashort pulse laser in chamber; Nonlinear crystal can be arbitrarily to the nonlinear crystal of above-mentioned two-way optical maser wavelength with frequency or beat frequency phase coupling; Realizing synchronously and carry out and frequently or the laser of difference frequency, can have only two, also can be many arbitrarily.
The precise active synchronization unit of different ultrashort pulse lasers proposed by the invention, can make up the ultrashort pulse laser that has arbitrarily the different wave length distinct pulse widths, utilize the stroke of electronics phase-locked loop feedback circuit control piezo-activator and the displacement that electronic computer is controlled motorized precision translation stage in the laser instrument in real time, it is realized the high accuracy active synchronization, on this basis by in the nonlinear crystal of a phase matched, above-mentioned synchronous laser pulse being carried out and frequency, and utilization and frequency laser feed back, and further improved synchronization accuracy. End is got up, and main feature of the present invention has:
1. the present invention has realized the active synchronization of a femto-second laser and a picosecond laser, has filled up the in the world technological gap of active synchronization femtosecond laser and picosecond laser.
2. realize among the present invention that two synchronous ultrafast laser are spatially separate, can be by changing any laser instrument wherein, perhaps add more ultrafast laser, realize the synchronous output of different ultrashort pulse lasers, can utilize further on this basis that synchronous laser produces different wave length with frequency laser or difference frequency Laser output.
3. the phase-locked loop circuit of many covers and real time computer control have been adopted among the present invention, improved synchronization accuracy and holding time synchronously, and the determining of relative time position between the two bundle laser pulses after having realized synchronously, for the application that utilizes nonlinear frequency transformation between the synchronous laser to produce laser with new wavelength provides the foundation.
Claims (3)
1. the precise active synchronization unit of a different ultrashort pulse lasers, comprise a picosecond laser, a femto-second laser, synchronous control system and light path regulating device, described picosecond laser is used to produce picosecond laser, described femto-second laser is used to produce femtosecond laser, described synchronous control system is used for the light signal of two bundle laser is converted into the signal of telecommunication and exports the active synchronization that the control signal that drives described light path regulating device realizes two lasers, described synchronous control system comprises at least one phase-locked loop circuit, described light path regulating device comprises translation stage and the piezo-activator that is positioned at femto-second laser, and the chamber length in vibration chamber that is used for regulating described femto-second laser is to cooperate described picosecond laser; It is characterized in that, described synchronous control system comprises first phase-locked loop circuit and second phase-locked loop circuit, first high-speed photodetector, second high-speed photodetector, described first phase-locked loop circuit comprises first bandpass amplifier, second bandpass amplifier, first frequency divider, second frequency divider, adjustable time delay, first digital phase discriminator, first second-order filter circuit, and described first high-speed photodetector, first bandpass amplifier, first frequency divider, adjustable time delay, first digital phase discriminator, first second-order filter circuit, piezo-activator connect successively; Described second phase-locked loop circuit comprises first band pass filter, second band pass filter, standard-frequency signal generator, first frequency mixer, second frequency mixer, the 3rd bandpass amplifier, the logical amplifier of the four-tape, second digital phase discriminator, second second-order filter circuit; Described second high-speed photodetector, second bandpass amplifier, second frequency divider, first digital phase discriminator connect successively; Described first high-speed photodetector, first band pass filter, first frequency mixer, the 3rd bandpass amplifier, second digital phase discriminator, second second-order filter circuit, piezo-activator connect successively; Described second high-speed photodetector, second band pass filter, second frequency mixer, the logical amplifier of the four-tape, second digital phase discriminator connect successively; Described standard-frequency signal generator connects first frequency mixer, second frequency mixer respectively.
2. the precise active synchronization unit of different ultrashort pulse lasers according to claim 1, it is characterized in that, described synchronous control system also comprises the 3rd phase-locked loop circuit, the 3rd photodetector, described the 3rd phase-locked loop circuit comprises D.C. regulated power supply, voltage stabilizing chip, potentiometer, subtracter, accurate amplifier, loop filter, adjustable potentiometer, and second second-order filter circuit in described D.C. regulated power supply, voltage stabilizing chip, potentiometer, subtracter, accurate amplifier, loop filter, adjustable potentiometer, second phase-locked loop circuit connects successively; Described the 3rd photodetector connects described subtracter.
3. the precise active synchronization unit of different ultrashort pulse lasers according to claim 2, it is characterized in that, described light path regulating device also comprises electronic computer, and described electronic computer is electrically connected with translation stage in the light path, is used for controlling automatically moving of translation stage.
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| CN102707651B (en) * | 2012-05-21 | 2014-07-23 | 天津大学 | Synchronous control system for millisecond laser and nanosecond laser |
| CN103887693B (en) * | 2014-03-07 | 2016-08-24 | 中国科学院上海光学精密机械研究所 | Ultrashort laser pulse femtosecond magnitude time delay synchronous method |
| CN103968960B (en) * | 2014-03-31 | 2017-04-12 | 中国科学院物理研究所 | Method for measuring synchronization precision of synchronous pulse laser |
| CN107611759A (en) * | 2017-10-13 | 2018-01-19 | 中国科学院上海应用物理研究所 | A kind of laser phase-locking device and method |
| CN111129936B (en) * | 2019-12-13 | 2021-04-02 | 北京无线电计量测试研究所 | Device and method for generating mode-locked pulse laser |
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| CN1917306A (en) * | 2006-08-10 | 2007-02-21 | 天津大学 | Adjustable femtosecond pulse generator in dual wavelengh synchronized accuratly |
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| Huan Zhao,et al..Sum-frequency generation between an actively synchronized ultrashort Ti:sapphire laser and a Nd:YVO4 laser.J.Opt.Soc.Am.B.2008,25(7),B39-B41. * |
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