CN101598882A - Device with frequently different ultrashort laser pulses generation laser with new wavelength - Google Patents
Device with frequently different ultrashort laser pulses generation laser with new wavelength Download PDFInfo
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Abstract
The present invention discloses the device that a kind of and frequently different ultrashort laser pulses produce laser with new wavelength, comprise at least one picosecond laser, at least one femto-second laser, at least one nonlinear crystal and synchronous control system and light path regulating system, picosecond laser is used to produce picosecond laser, femto-second laser is used to produce femtosecond laser, synchronous control system is used to realize the active synchronization of each laser instrument, nonlinear crystal is used for synchronous laser and produces the non-linear frequency conversion each other, it is long that the light path regulating system is used to regulate the chamber in femto-second laser vibration chamber, and the beam Propagation of adjustment femtosecond laser and picosecond laser.The present invention makes up different ultrashort pulse lasers, utilize the stroke of electronics phase-locked loop feedback circuit control piezo-activator and the displacement of motorized precision translation stage, it is realized the high precision active synchronization, on this basis by in the nonlinear crystal of a phase matching, above-mentioned synchronous laser pulse being carried out and frequently, thereby produce new wavelength broadband ultra-short pulse laser.
Description
Technical field
The present invention relates to a kind of lasing device, be specifically related to a kind of device that produces laser with new wavelength by different ultrashort laser pulses with frequency.
Background technology
In laser technology research, ultra-short pulse laser discloses the dynamic (dynamical) unique property of material transient state as the human time period sign that can control and in microworld, be one of the most popular laser research contents, and an important content of ultra-short pulse laser research is exactly the wave band of expansion ultra-short pulse laser always.Because femtosecond commonly used, the optical maser wavelength that picosecond laser can produce only are limited in several fixed wave length scopes few in number, far can not satisfy the application demand of ubiquitous ultrashort laser pulse, so people often adopt optical parametric oscillator (OPO) and optical parameter to amplify technology such as (OPA) to expand its wavelength coverage.Though OPO, OPA technology have obtained significant progress in the time of last decade, do not have advantage at aspects such as technical costs, reliabilities.Although directly frequency multiplication can obtain reliability and the similar second harmonic of ultra-short pulse laser light source, the ultrashort laser pulse wavelength of generation is subjected to the restriction of first-harmonic light source like this, getable wavelength also be extremely limited.In recent years, the appearance of the ultra-short pulse laser high-precise synchronization technology of different wave length and development (document 1, J.Tian, Z.Wei, P.Wang, H Han, J.Zhang, L.Zhao, Z.Wang and J.Zhang, " Independently tunable 1.3W femtosecond Ti:sapphirelasers passively synchronized with attosecond timing jitter and ultrahighrobustness " Opt.Lett.30,2161 (2005), document 2, R.K.Shelton, S.M.Foreman, L.S.Ma, J.L.Hall, H.C.Kapteyn, M.M.Murnane, M.Notcutt, and J.Ye, " Sub-femtosecond timing jitter between two independent; activelysynchronized mode-locked lasers " Opt.Lett.27312 (2002)), for we by with frequently and the difference frequency technology ultra-short pulse laser that obtains new wavelength a kind of new feasible program is provided.People such as calendar year 2001 Wei Zhiyi are at passive and synchronous femto second titanium precious stone laser and mixing on the basis of chromium forsterite laser, by in the measurement of correlation with the frequency process, obtained the femto-second laser pulse (document 3 of 500nm wavelength, Z.Wei, Y.Kaboyashi, and K.Torizuka, " Passive synchronizationbetween femtosecond Ti:sapphire and Cr:forsterite lasers " Appl.Phys.B 74, S171 (2002)).In fact, except producing than the shorter laser with new wavelength of two fundamental wavelengths of synchronous laser with frequency and frequency multiplication process, difference frequency two synchronous laser can also obtain the longer new wavelength ultra-short pulse laser of wavelength, even the THz radiation.By the synchronous different laser of combination, might make us obtain the ultrashort laser pulse new technology that conversion efficiency, unfailing performance, technical costs even covering wavelength all are better than OPO, OPA like this.
Ultrashort laser pulse can be divided into synchronously that passive and synchronous and two kinds of skills of active synchronization are not passive and synchronous normally to be realized by coupling two mode-locked laser pulses in the strong Kerr effect crystal intracavity, its advantage is the synchronization accuracy height, but light path complexity, be not easy to regulate, and two laser instruments spatially can not be independent; Active synchronization then is to utilize the repetition frequency of electronics phaselocked loop FEEDBACK CONTROL laser and realize that synchronously, though it can overcome above those unfavorable factors, synchronization accuracy is relatively low.Recently along with the development of femtosecond laser carrier envelope phase (CEP) and frequency comb research, the synchronization accuracy of active synchronization laser has reached and passive and synchronous close result, this is any wavelength of high precision active synchronization, any ultra-short pulse laser of pulsewidth, and obtains new wavelength ultra-short pulse laser by nonlinear frequency transformation on this basis feasible technological approaches is provided.
Summary of the invention
Problem at the prior art existence, the purpose of this invention is to provide on a kind of basis of the ultrashort pulse laser that has the different wave length distinct pulse widths in the high precision active synchronization arbitrarily, by in nonlinear crystal and the synchronous laser pulse of frequently above-mentioned two bundles produce the device of new wavelength broadband ultra-short pulse laser.
For achieving the above object, the invention provides the device that a kind of and frequently different ultrashort laser pulses produce laser with new wavelength, comprise at least one picosecond laser, at least one femto-second laser, at least one nonlinear crystal and synchronous control system and light path regulating system, 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 to realize the active synchronization of each laser instrument, described nonlinear crystal is used for synchronous laser and produces nonlinear frequency transformation each other, it is long that described light path regulating system is used to regulate the chamber in femto-second laser vibration chamber, and the beam Propagation of adjustment femtosecond laser and picosecond laser.
Further, described synchronous control system comprises first high-speed photodetector, second high-speed photodetector, at least one phase-locked loop circuit, described light path regulating system 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 bandpass filter, second bandpass 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 bandpass 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 bandpass 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 high-speed 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 voltage stabilizing chip, potentiometer, subtracter, accurate amplifier, loop filter, adjustable potentiometer, second phase-locked loop circuit successively; Described the 3rd high-speed photodetector connects described subtracter.
Further, described light path regulating system comprises uncoated first glass substrate, second glass substrate, the device of climbing, second condenser lens, the 3rd condenser lens, Siping City's face total reflective mirror, the 5th plane total reflective mirror, the 6th plane total reflective mirror, the 7th plane total reflective mirror, the 8th plane total reflective mirror, the 9th plane total reflective mirror, after the transmission and reflection of described picosecond laser through first glass substrate, be divided into two-way, the device of climbing is passed through in a road of transmission, behind second condenser lens, incide in the nonlinear crystal after the reflection through Siping City's face total reflective mirror, first high-speed photodetector is incided on another road of reflection again; After the transmission and reflection of described femtosecond laser through second glass substrate, be divided into two-way, a road successively after the reflection through the 6th plane total reflective mirror, the 9th plane total reflective mirror, the 8th plane total reflective mirror, the 7th plane total reflective mirror of transmission, then through the 3rd condenser lens, again through the reflection of the 5th plane total reflective mirror, incide in the nonlinear crystal, second high-speed photodetector is incided on another road of reflection.
Further, described light path regulating system also comprises uncoated the 3rd glass substrate, incides the 3rd high-speed photodetector after the described and reflection of light signal through the 3rd glass substrate frequently.
Further, described light path regulating system also comprises robot calculator, and described robot calculator is electrically connected with described translation stage, is used for controlling moving of translation stage.
Different ultrashort laser pulses with frequency proposed by the invention produce the devices of laser with new wavelength, can make up the ultrashort pulse laser that has the different wave length distinct pulse widths arbitrarily, utilize the stroke of electronics phase-locked loop feedback circuit control piezo-activator and the displacement that robot calculator is controlled motorized precision translation stage in real time, it is realized the high precision active synchronization, on this basis by in the nonlinear crystal of a phase matching, above-mentioned synchronous laser pulse being carried out and frequently or difference frequency, thereby produce new wavelength broadband ultra-short pulse laser.End is got up, and principal feature of the present invention has:
1. having produced centre wavelength is the broadband ultra-short pulse laser output of 460nm, has filled up the blank of the ultrashort pulse laser of this wavelength in the world.
2. the nonlinear crystal among the present invention can be changed arbitrarily: adopt corresponding and the frequency crystal, can obtain short wavelength's broadband ultra-short pulse laser; Adopt corresponding difference frequency crystal, can obtain long wavelength's broadband ultra-short pulse laser.
3. the femto-second laser among the present invention can be regulated its output spectrum by quartz prism wherein, and tuning by the femto-second laser output spectrum can realize exporting the tunable of broadband ultra-short pulse laser spectrum.Equally, select for use the picosecond laser of tunable wave length also can realize exporting the tunable of broadband ultra-short pulse laser wavelength.
4. two laser instruments as the first-harmonic light source are spatially separate among the present invention, can be by changing any laser instrument wherein, and dispose corresponding nonlinear crystal, obtain different wave length with frequency laser or difference frequency 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 oscillograph collects;
Fig. 9 spectral intensity curve that collect for spectrometer and frequency laser.
Embodiment
Embodiment 1:
As shown in Figures 1 to 4, a kind of and the frequently different ultrashort laser pulses that present embodiment provides produce the device of laser with new wavelength, comprise a picosecond laser 1, a femto-second laser 2, a nonlinear crystal 10, synchronous control system and light path regulating system, picosecond laser 1 is used to produce picosecond laser, femto-second laser 2 is used to produce femtosecond laser, nonlinear crystal 10 is used for synchronous laser and produces nonlinear frequency transformation each other, synchronous control system is used for the light signal of two bundle laser is converted into electric signal and exports the active synchronization that the control signal that drives the light path regulating system realizes two laser instruments, 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, the light path regulating system comprises the translation stage 9 and piezo-activator 6 in the femto-second laser, 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.The device 400 of climbing is used for adjusting the light height of picosecond laser 1.
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 titanium gem crystal 002 is positioned on the horizontal rotating table, and universal stage is placed on the translation stage of 40 * 40mm, the water-cooled circulation is inserted with proofed sleeve in the two ends of universal stage, and rotation 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 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 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 angle, they are opposite on the translation stage of horizontal rotating table and 40 * 40mm, and insertion vibration chamber is long-armed, light path 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 titanium precious stone laser.The whole light height of titanium jewel oscillator 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, 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 output electric pulse sequence of picosecond laser and femtosecond laser, 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.
As shown in Figure 4, second phase-locked loop circuit comprises first bandpass filter 203, second bandpass 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 bandpass 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 bandpass 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.
First high-speed photodetector 101 receives the locked mode signal output electric pulse sequence of picosecond laser, through first bandpass 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 (intermediatefrequency from 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.The locked mode signal output electric pulse sequence that second high-speed photodetector 102 receives femtosecond laser is 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 frequency of first phase-locked loop circuit 3 is 68MHz, the repetition frequency of second phase-locked loop circuit 4 is 816MHz, they contrast the pulse repetition rate of two laser instruments simultaneously, all can produce the voltage signal of drive pressure electric actuator 6, thereby regulate the repetition frequency of ti sapphire laser.But the same time only has a kind of signal loading on piezo-activator 6, comes the output laser pulse of synchronous two laser instruments.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.
The phase-locked loop circuit of two covers is opened simultaneously, receives the two-way laser pulse simultaneously with a photodetector (not shown), is observed the light signal that receives by the oscillograph (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 oscillograph, 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 pulse waveforms on the oscillograph 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 oscillograph still can keep overlapping.
Femto-second laser 2 and picosecond laser 1 produce and each element frequently as shown in Figure 1, 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 incident 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 incident 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 incident angles the 750nm-850nm wave band is all-trans.Nonlinear crystal 10 is BBO (β-barium borate, beta barium borate) crystal by 25.4 ° of cuttings of a class phase matching angle, is of a size of 4 * 4 * 2mm, nonlinear crystal 10 is positioned on the adjustable micropositioning stage of bidimensional, and micropositioning stage is placed 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 titanium precious stone 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 ti sapphire 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 titanium precious stone laser just focuses on the center of nonlinear crystal 10, and makes the focus of two bundle laser overlap in nonlinear crystal 10.After synchronous control system realization two bundle laser high-precision active synchronization, displacement and the frequency laser of regulating translation stage will produce.Continue to regulate the pitching and the angle of nonlinear crystal 10 and rotate horizontal rotating table, make with frequency laser output the strongest.The spectral intensity curve that is collected by spectrometer as shown in Figure 9.
Adopt the phase-locked loop circuit of two covers, both play a different role in synchronizing process, complement 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 laser instruments synchronously after, the adjustable time delay in the regulation loop can change the relative time position of femtosecond and picosecond laser pulse, range of adjustment can reach for tens nanoseconds; And after utilizing this PLL to start synchronously, the relative time position between the two bundle laser pulses is fixed basically, and this is for being very favorable with 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 laser instruments synchronously after, relative time position between two laser instrument output laser pulses is uncertain, will inevitably give like this and adjusting frequently bring certain difficulty.
Two cover PLL respectively have relative merits, 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 oscillograph of 5GHz does not observe variation with sample frequency).Therefore when carrying out and frequently 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 present embodiment synchronous control system with devices frequently different ultrashort laser pulses generation laser with new wavelength that provide 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 high-speed 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 high-speed photodetector 301 connects subtracter 302.
The 3rd phase-locked loop circuit 5 utilizes and the frequency light signal is done feedback, earlier receive (with inciding the 3rd high-speed photodetector 301 after the reflection of frequency laser through the 3rd glass substrate c that do not have plated film) with frequency laser by the 3rd high-speed photodetector 301 parts, the electric signal 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.
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 in second phase-locked loop circuit 4.After the phase-locked loop circuit of three covers was all realized running well, synchronization accuracy can obtain further raising by the stability that a hundreds of femtosecond is brought up to tens femtoseconds and frequency laser.
Embodiment 3:
As shown in Figure 7, what present embodiment provided produces the device of laser with new wavelength except that the structure with embodiment 2 with frequently different ultrashort laser pulses, the light path regulating system also comprises robot calculator 7, and robot calculator 7 is electrically connected with translation stage 9, is used for controlling moving of translation stage 9.Robot calculator 7 is monitoring the long variation in the relative chamber of two laser instruments 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 laser instruments can keep synchronously stable exporting with frequency laser being arranged all the time always.
Adding robot calculator control in real time is the time of keeping synchronously in order to improve.If there is not robot calculator 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 steady state (SS); 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 instrument of difference frequency, can have only two, also can be many arbitrarily.
Claims (7)
1. one kind produces the device of laser with new wavelength with different ultrashort laser pulses frequently, it is characterized in that, comprise at least one picosecond laser, at least one femto-second laser, at least one nonlinear crystal and synchronous control system and light path regulating system, 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 to realize the active synchronization of each laser instrument, described nonlinear crystal is used for synchronous laser and produces nonlinear frequency transformation each other, it is long that described light path regulating system is used to regulate the chamber in femto-second laser vibration chamber, and the beam Propagation of adjustment femtosecond laser and picosecond laser.
2. according to claim 1 and frequently different ultrashort laser pulses produce the device of laser with new wavelength, it is characterized in that, described synchronous control system comprises a plurality of high-speed photodetectors, at least one phase-locked loop circuit, described light path regulating system comprises translation stage and the piezo-activator in the 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.
3. according to claim 2 and frequently different ultrashort laser pulses produce the device of laser with new wavelength, it is characterized in that described laser high-speed photodetector is specially first high-speed photodetector, second high-speed photodetector; Described synchronous control system comprises first phase-locked loop circuit and second phase-locked loop circuit, 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 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 bandpass filter, second bandpass 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 bandpass 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 bandpass 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.
4. according to claim 3 and frequently different ultrashort laser pulses produce the device of laser with new wavelength, it is characterized in that, described synchronous control system also comprises the 3rd phase-locked loop circuit, the 3rd high-speed photodetector, described the 3rd phase-locked loop circuit comprises D.C. regulated power supply, the voltage stabilizing chip, potentiometer, subtracter, accurate amplifier, loop filter, adjustable potentiometer, described D.C. regulated power supply connects the voltage stabilizing chip successively, potentiometer, subtracter, accurate amplifier, loop filter, adjustable potentiometer, second second-order filter circuit 211 in second phase-locked loop circuit; Described the 3rd high-speed photodetector connects described subtracter.
5. produce the device of laser with new wavelength according to claim 3 or 4 described and different ultrashort laser pulses frequently, it is characterized in that, described light path regulating system comprises uncoated first glass substrate, second glass substrate, the device of climbing, second condenser lens, the 3rd condenser lens, Siping City's face total reflective mirror, the 5th plane total reflective mirror, the 6th plane total reflective mirror, the 7th plane total reflective mirror, the 8th plane total reflective mirror, the 9th plane total reflective mirror, after the transmission and reflection of described picosecond laser through first glass substrate, be divided into two-way, one the tunnel through climbing device, behind second condenser lens, incide in the nonlinear crystal after the reflection through Siping City's face total reflective mirror, first high-speed photodetector is incided on another road again; After the transmission and reflection of described femtosecond laser through second glass substrate, be divided into two-way, one the tunnel successively after the reflection through the 6th plane total reflective mirror, the 9th plane total reflective mirror, the 8th plane total reflective mirror, the 7th plane total reflective mirror, then through the 3rd condenser lens, again through the reflection of the 5th plane total reflective mirror, incide in the nonlinear crystal, second high-speed photodetector is incided on another road.
6. according to claim 5 and frequently different ultrashort laser pulses produce the device of laser with new wavelength, it is characterized in that, described light path regulating system also comprises uncoated the 3rd glass substrate, incides described the 3rd high-speed photodetector after the described and reflection of light signal through the 3rd glass substrate frequently.
7. according to claim 6 and frequently different ultrashort laser pulses produce the device of laser with new wavelength, it is characterized in that, described light path regulating system also comprises robot calculator, and described robot calculator is electrically connected with described translation stage, is used for controlling moving of translation stage.
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