CN103531999A - Self-starting mode locking device and method as well as laser system including device - Google Patents
Self-starting mode locking device and method as well as laser system including device Download PDFInfo
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- CN103531999A CN103531999A CN201310498658.5A CN201310498658A CN103531999A CN 103531999 A CN103531999 A CN 103531999A CN 201310498658 A CN201310498658 A CN 201310498658A CN 103531999 A CN103531999 A CN 103531999A
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Abstract
The invention provides a self-starting mode locking device and method as well as a laser system including the device, and particularly provides a self-starting mode locking device used for a titanium doped sapphire crystal femtosecond laser which comprises a reflecting mirror alignment jig mounted with a reflecting mirror and a translation platform fixed with a dispersion compensation component. The self-starting mode locking device comprises piezoelectric ceramic, an electromagnet and a controller, wherein the piezoelectric ceramic is mounted on the reflecting mirror alignment jig and used for adjusting horizontal and vertical attitudes of the reflecting mirror; the electromagnet is mounted to the translation platform and used for enabling the translation platform to move during power on so as to start mode locking of the laser; and the controller is electrically connected with the piezoelectric ceramic and the electromagnet, and controls the piezoelectric ceramic and the electromagnet according to received current signals of output laser of the laser and monitored laser power.
Description
Technical field
The present invention relates to femtosecond laser technology field, particularly for self-starting clamping apparatus and the method for titanium-doped sapphire femto-second laser and the titanium-doped sapphire fs-laser system that comprises this device.
Background technology
The Self-mode-locking of titanium-doped sapphire (hereinafter referred is titanium jewel) is found in nineteen ninety by people such as Scottish Spence, the appearance of this technology can be described as the brand-new chapter that has opened ultra-short pulse laser research completely, different from traditional active mode locking and passive mode locking is, the laser oscillator that contains strong Kerr effect medium for some, under specific cavity structure, without adopting any additional modulation or saturated absorbing body, can realize stable locked mode running, this simple structure combines with the titanium precious stone laser with super broad tuning bandwidth, become the main flow of current ultra-short pulse laser, and produced the ultra-short pulse laser of pulse duration lower than 5fs.
The basic principle that current this mode-locking technique relies on generally believes it is because solid state gain medium is under strong-focusing pumping due to formed Kerr effect.Under non-homogeneous light action because the refractive index of Kerr effect medium is explained by following formula:
n(r)=n
0+n
2I(r)，
N wherein
0for with the irrelevant static refractive index of light intensity, n
2for Kerr coefficient, I (r) is light distribution.Under the effect of pump light and oscillation light, the refraction index profile of medium will radially change like this, and gain media is equivalent to a GRIN Lens.When oscillating laser passes through this medium, stronger light shows as the different focus version of two covers from weak light, and it also shows as different beam sizes everywhere in chamber.Like this, if the suitable hard-edge light hurdle that adds a size, somewhere makes the transmitting beam causing due to strong-focusing compared with high light just in time by this light hurdle in chamber, and the transmitting beam causing compared with the weak focus of the low light level can not be passed through, system equivalence is in a quick saturated absorbing body.Laser reaches after dynamic equilibrium through repeatedly coming and going vibration, and stable self mode locking process has also just been set up.
The startup of the locked mode of titanium jewel femtosecond laser oscillator (being designated hereinafter simply as ti sapphire laser) must have an additional perturbation, most typical method is the translation stage that promotes to place prism or chirped mirror, change the insertion amount of prism or the position of chirped mirror, and then the pattern in change chamber, thereby start locked mode.The method of the most general promotion translation stage is to open laser cover plate manually to promote, or rotate the translation stage vernier knob that stretches out cover plate, locked mode is started, and this manual method is because needs are opened laser or on the cover board burrowed micro actuator is stretched out, comparatively loaded down with trivial details.If external environment disturbance is large or Mode-locking For Lasers state less stable, need to manually boot continually locked mode, the complexity that this has increased laser user job virtually, has reduced operating efficiency.Meanwhile, because air agitation, personnel walk about, speech etc. can be caused the slight jitter of mechanical organ in laser, cause the power output of laser to weaken gradually and even reduce to zero, that is, make Ti∶sapphire mode-locked laser long-time stability poor.
Summary of the invention
Based on this, the object of the present invention is to provide a kind of self-starting clamping apparatus and method for ti sapphire laser, it can automatically remain on stable mode-locking state by laser and for a long time without any manual operation, and the present invention also aims to provide a kind of titanium sapphire laser system that comprises this self-starting clamping apparatus.
In a first aspect of the present invention, a kind of self-starting clamping apparatus for ti sapphire laser is provided, described laser comprises the speculum adjusting bracket that speculum is installed and the translation stage that is fixed with dispersive compensation element, described self-starting clamping apparatus comprises: piezoelectric ceramic, it is arranged on described speculum adjusting bracket, for level and the vertical attitude of difference accommodation reflex mirror; Electromagnet, it is mounted to described translation stage, thereby for making described translation stage move the locked mode that starts described laser when switching on; And controller, it is electrically connected to described piezoelectric ceramic and electromagnet, and controls described piezoelectric ceramic and described electromagnet according to the current signal of the Output of laser of the described laser receiving and the laser power monitoring.
In one embodiment, described controller comprises judge module and solenoid actuated module, whether described judge module judges laser locked mode monitor power and change according to the current signal of described laser and laser power, and described judged result is sent to respectively to solenoid actuated module and piezoelectric ceramic with respectively according to controlling the driving of electromagnet and the voltage on piezoelectric ceramic from the judged result of judge module.
Alternatively, described controller also comprises RF Amplifier Module, for described current signal is amplified.
Alternatively, described controller also comprises voltage amplification module, for the voltage signal to laser power, amplifies.
In one embodiment, described controller also comprises: numeral/analog conversion module, for the voltage signal of laser power is converted to analog signal and is sent to described judge module; And analog-to-digital converting module, for being converted to digital signal and being sent to piezoelectric ceramic from the analog voltage signal of judge module output.
In one embodiment, when the described current signal receiving is not that locked mode signal and described laser power be not while remaining on maximum, described controller makes electromagnet energising and regulates the voltage on described piezoelectric ceramic, and when the described current signal receiving be locked mode signal and the described laser power that monitors while remaining on maximum, described controller stops regulating described piezoelectric ceramic and stops to described electromagnet power supply.
In another aspect of this invention, provide a kind of titanium sapphire laser system, it comprises ti sapphire laser and self-starting clamping apparatus as above.
In still another aspect of the invention, provide a kind of method for self-starting device as above, having comprised: step 1: receive described laser Output of laser current signal and monitor the power of Output of laser; And step 2: control the movement of the translation stage that is fixed with dispersive compensation element of laser power and described laser according to the current signal of the Output of laser of the laser receiving and the laser power monitoring.
In one embodiment, whether described step 2 comprises according to the current signal of described laser and laser power and judges laser locked mode monitor power and change, and control laser power and translation stage according to described judged result.
Alternatively, described step 2 also comprises the step that the current signal to receiving amplifies.
Alternatively, described step 2 also comprises the step that the signal of the laser power to receiving amplifies.
In one embodiment, described step 2 also comprises the signal of laser power is converted to analog voltage signal, and the analog voltage signal from judged result is converted to digital signal.
In one embodiment, described step 2 comprise when the signal of telecommunication receiving be not that locked mode signal and/or power is not while remaining on maximum, thereby mobile described translation stage starts the locked mode of described laser and regulates described laser power, and when the described signal receiving be locked mode signal and the described laser power that monitors while remaining on maximum, stop regulating described laser power and described translation stage stopped mobile.
In one embodiment, described translation stage is thruster translation stage.
In one embodiment, described dispersive compensation element is chirped mirror, and the movement of described translation stage makes the change in location of described chirped mirror.In another embodiment, described dispersive compensation element is prism pair, and the movement of described translation stage makes the insertion quantitative change of right one of them of described prism.
Apparatus structure of the present invention is simple, easy to adjust, is easy to locked mode, and to laser whether the judgement of locked mode be quick on the draw and accurately, therefore can be applicable to the locked mode operation steady in a long-term of ti sapphire laser.
Utilize device of the present invention, can be completely by circuit, feed back and automatically laser is remained on to mode-lock status for a long time and without any manual operation, thereby the long-time stability of laser have been guaranteed, eliminate the triviality that manually boots locked mode, and realized summary and the intellectuality that starts locked mode mode.
Accompanying drawing explanation
Referring to accompanying drawing, embodiments of the invention are further described, wherein:
Fig. 1 shows the laser system that comprises ti sapphire laser according to the embodiment of the present invention;
Fig. 2 shows according to the adjusting bracket of the speculum that two piezoelectric ceramic are installed of the embodiment of the present invention;
Fig. 3 shows the thruster translation stage that tubular type electromagnet is installed according to the embodiment of the present invention;
Fig. 4 shows according to the module map of the laser system shown in Fig. 1 of the embodiment of the present invention, wherein shows the details of controller;
Fig. 5 shows according to the control flow chart of the self-starting locked mode method of the embodiment of the present invention; And
Fig. 6 show according to the embodiment of the present invention ti sapphire laser is carried out to the test result of self-starting locked mode, the line in figure (a) is for only using the situation of electromagnet, line (b) is for being used the two situation of electromagnet and piezoelectric ceramic.
Embodiment
Fig. 1 shows the laser system that comprises ti sapphire laser 10 according to the embodiment of the present invention.
As shown in Figure 1, laser by the green (light) laser output as pumping source focuses on titanium gem crystal by condenser lens L after plane mirror M1, M2 reflection, after the Electron absorption green glow of crystals by ground state transition to excitation state, after one period of relaxation time, by spontaneous transition, return ground state, launch red fluorescence simultaneously.Utilize concave mirror M3 and M4 to collect the fluorescence that crystal sends, and make fluorescence between end mirror EM and outgoing mirror OC, come and go vibration by chirped mirror CM1, CM2 and CM3, the electronics of crystals in excitation state is subject to exciting of fluorescence and produces stimulated radiation.Now, outside at outgoing mirror, can see dazzling ruddiness, this is the continuous laser that ti sapphire laser produces.
The Output of laser of laser system 10 is after passing through beam splitter, and a part is received by photodiode PD, and another part is input to silicon photocell power meter and is converted into voltage signal.The current signal producing through photodiode and the voltage signal producing through power meter are admitted to controller, and the controller adjusting bracket that carrys out FEEDBACK CONTROL mirror M 1 according to the current signal receiving and voltage signal and for the fixing translation stage of chirped mirror.
Two piezoelectric ceramic are installed on the adjusting bracket of mirror M 1, and wherein the two-stage of two piezoelectric ceramic is connected to each other, and is respectively used to level and the vertical state of accommodation reflex mirror M1.On the translation stage for fixing chirped mirror, tubular type electromagnet is installed.In one embodiment, as shown in Figure 1, tubular type electromagnet F is arranged on the translation stage of fixing chirped mirror CM2.Piezoelectric ceramic and electromagnet F are electrically connected to respectively controller.
Selectively, also can use the structure having more than the chirped mirror of 3, and chirped mirror beyond can mobile chirped mirror CM2 or simultaneously mobile a plurality of chirped mirrors start the locked mode of laser.
Fig. 2 shows according to the adjusting bracket 20 of the mirror M that piezoelectric ceramic is installed 1 of the embodiment of the present invention.
As shown in Figure 2, the fixed head 21 of speculum adjusting bracket 20 is fixed by screws on laser base board, and mirror M 1 is fixed on the moving plate 22 of speculum adjusting bracket 20, between fixed head 21 and moving plate 22, by spring, connects.Piezoelectric ceramic P withstands cover plate 23, and its cover plate 23 and moving plate 22 are fixed together.In use, when when knob 25 rotating screw bolt 24, can be in level and vertical two dimensions the angle of thick mobilizing board, thereby change the angle of speculum; And when pressurizeing to piezoelectric ceramic, angle and the attitude of automatic regulation moving plate 22 and mirror M 1 subtly.
Fig. 3 shows the translation stage that tubular type electromagnet F is installed according to the embodiment of the present invention.
As shown in Figure 3, the fixed head 31 of translation stage utilizes screw to be fixed on laser base board, and the mirror holder 20 that chirped mirror CM2 is installed is fixed on moving plate 32, between fixed head 31 and moving plate 32, with sliding type, connects.Moving plate 32 can be parallel to fixed head 31 and slide under the touching of hand, while spring-compressed, and after hand unclamps, the tension force of spring can make moving plate 32 return to original position.Electromagnet F is fixed to the fixed head 31 of translation stage by connector 33, and the push rod 34 of electromagnet F withstands moving plate 32.When electromagnet is switched on, push rod 34 can promote moving plate 32, thereby changes the position of chirped mirror CM2, starts thus the locked mode of ti sapphire laser.
Alternatively, the dispersive compensation element of ti sapphire laser can be prism pair, and can electromagnet be arranged on the translation stage that is fixed with one of them prism by same principle.
Fig. 4 shows according to the module map of the laser system shown in Fig. 1 of the embodiment of the present invention, wherein shows the details of controller.
As shown in the figure, controller comprises judge module and solenoid actuated module, whether judge module judges laser locked mode monitor power and change according to the current signal of laser and laser power, and judged result is sent to respectively to solenoid actuated module and piezoelectric ceramic with respectively according to controlling the driving of electromagnet and the voltage on piezoelectric ceramic from the judged result of judge module.
Controller also comprises: numeral/analog conversion module, for the voltage signal of laser power is converted to analog signal and is sent to described judge module; And analog-to-digital converting module, for being converted to digital signal and being sent to piezoelectric ceramic from the analog voltage signal of judge module output.
In one embodiment, as shown in Figure 4, controller can also comprise alternatively: RF Amplifier Module, for described current signal is amplified; And/or voltage amplification module, for the voltage signal to laser power, amplify.
Fig. 5 shows according to the flow chart of the self-starting locked mode method of the embodiment of the present invention.
In step S601, start titanium sapphire laser system, wherein start ti sapphire laser and open controller and the power supply of electromagnet.
In step S602, receive laser Output of laser current signal and monitor the power of Output of laser.
In step S603, according to the current signal from photodiode receiving with from the voltage signal of power meter, judge whether locked mode and monitoring power change laser.
In step S604, when judging the current signal receiving, be locked mode signal and laser power while remaining on maximum, stop regulating the voltage on piezoelectric ceramic and stop, to electromagnet power supply, now obtaining stable locked mode operation (S606).
In step S605, when judging the signal of telecommunication receiving, be not locked mode signal and/or power while not remaining on maximum, make electromagnet energising, the moving plate of translation stage is because the thrust that electromagnet produces is pushed, change thus the position of chirped mirror, thereby start the locked mode of ti sapphire laser.Voltage on adjusting piezoelectric ceramic is to regulate the power of the Output of laser of laser.Then, program proceeds to step S604, until obtain stable locked mode.
In one embodiment, if stopped because extraneous disturbance causes mode-lock status, do not detect locked mode signal or locked mode signal jitter is serious, readjust the voltage on piezoelectric ceramic and switch on to promote translation stage to electromagnet, until obtain stable locked mode.
Example 1
The centre wavelength of the Output of laser of ti sapphire laser is 800nm.Controller is by 12V Power supply.The pressurization scope of piezoelectric ceramic is 0-150V, and stroke is 9 μ m.The multiplication factor of radio frequency amplifier is 100.For example, radio frequency amplifier is amplified to 20V by the voltage signal of photodiode collection from 200mV.The external diameter of tubular type electromagnet is 16mm, and length is 20mm, and the translation distance after energising is 3mm.The way of propelling of translation stage is thruster, is of a size of 40 * 40 * 16mm, and stroke is 15mm.The photosensitive area of photodiode is 1mm, and rising edge and trailing edge are 1ns.The range of silicon photocell power meter is 7W.
In operation, start the ti sapphire laser having regulated, and open the power supply of controller and the power supply of electromagnet.Now, controller carries out the voltage scanning of 0-150V to piezoelectric ceramic, and the position of recording power when maximum, when controller does not detect locked mode signal and/or the power that monitors during lower than this maximum, make electromagnet switch on to promote translation stage, change thus the position of chirped mirror CM2, thereby start the locked mode of ti sapphire laser, then regulate the voltage on piezoelectric ceramic until regain prominent position.
Fig. 6 show according to the embodiment of the present invention ti sapphire laser is carried out to the test result of self-starting locked mode, the line in figure (a) is for only using the situation of electromagnet, line (b) is for being used the two situation of electromagnet and piezoelectric ceramic.Wherein, the sampling time is 24 hours, and the sampling interval is 10s.
Power stability test result in the situation that ti sapphire laser is only used electromagnet to start locked mode is as follows: average power is 474.7mW, and peak power is 513.4mW, and lowest power is 321.4mW, and standard deviation is 21.03mW, and power stability is 4.43%.As shown in line (a), because power jitter is larger, when approaching 3000s, locked mode is interrupted, and corresponding power drops to 320mW near 450mW, but (next time is when sample) mode-lock status is recovered automatically due to the self-starting of electromagnet in 10s.
At ti sapphire laser, use the two power stability test result carry out locked mode in the situation that of electromagnet and piezoelectric ceramic as follows: average power is 517.8mW, peak power is 527.8mW, lowest power is 507.4mW, and standard deviation is 3.972mW, and power stability reaches 0.77%.As shown in line (b), in this case, power output is comparatively stable, does not occur the situation that mode-lock status is interrupted in 24 hours.After laser mode locking, laser pulse width is 9.5fs, and the interval of each pulse of the mode locking pulse sequence of output is equal, is all about 12.5ns, that is, pulse repetition frequency is about 80MHz.
As can be seen here, ti sapphire laser use electromagnet and piezoelectric ceramic the two while carrying out locked mode, the stability of laser power is improved significantly.
And in the situation that not using any startup clamping apparatus, the canonical parameter of ti sapphire laser stable operation is about 24 hours; In the situation that using electromagnet start locked mode operation but do not use piezoelectric ceramic, the canonical parameter of its stable operation is 72 hours; Use electromagnet and piezoelectric ceramic the two laser is carried out to feedback regulation in the situation that, its parallel-adder settle-out time was over 1 week.Therefore, similarly, the stable mode-locking of laser is improved running time significantly.
Self-starting clamping apparatus proposed by the invention, simple in structure, sensitive and accurate to the judgement of mode-lock status, without any manual operation, completely by circuit, feed back automatically laser is remained on for a long time under mode-lock status and moved.
It should be noted last that, above embodiment and canonical parameter are only unrestricted in order to technical scheme of the present invention to be described.Although the present invention is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, technical scheme of the present invention is modified or is equal to replacement, do not depart from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (10)
1. for a self-starting clamping apparatus for titanium-doped sapphire femto-second laser, described laser comprises the speculum adjusting bracket that speculum is installed and the translation stage that is fixed with dispersive compensation element, and described self-starting clamping apparatus comprises:
Piezoelectric ceramic, it is arranged on described speculum adjusting bracket, for level and the vertical attitude of difference accommodation reflex mirror;
Electromagnet, it is mounted to described translation stage, thereby for making described translation stage move the locked mode that starts described laser when switching on; And
Controller, it is electrically connected to described piezoelectric ceramic and electromagnet, and controls described piezoelectric ceramic and described electromagnet according to the current signal of the Output of laser of the described laser receiving and the laser power monitoring.
2. device according to claim 1, wherein, described controller comprises judge module and solenoid actuated module, whether described judge module judges laser locked mode monitor power and change according to the current signal of described laser and laser power, and described judged result is sent to respectively to solenoid actuated module and piezoelectric ceramic to control the driving of electromagnet and the voltage on piezoelectric ceramic.
3. device according to claim 2, wherein, described controller also comprises RF Amplifier Module, for described current signal is amplified.
4. according to the device described in claim 2 or 3, wherein, described controller also comprises voltage amplification module, for the voltage signal to laser power, amplifies.
5. device according to claim 2, wherein, described controller also comprises: numeral/analog conversion module, for the voltage signal of laser power is converted to analog signal and is sent to described judge module; And analog-to-digital converting module, for being converted to digital signal and being sent to piezoelectric ceramic from the analog voltage signal of judge module output.
6. device according to claim 1 and 2, wherein, when the described current signal receiving is not that locked mode signal and described laser power be not while remaining on maximum, described controller makes electromagnet energising and regulates the voltage on described piezoelectric ceramic, and when the described current signal receiving be locked mode signal and the described laser power that monitors while remaining on maximum, described controller stops regulating described piezoelectric ceramic and stops to described electromagnet power supply.
7. a titanium-doped sapphire fs-laser system, it comprises titanium-doped sapphire femto-second laser and according to the self-starting clamping apparatus one of claim 1 to 6 Suo Shu.
8. for a method for the self-starting device one of claim 1 to 6 Suo Shu, comprising:
Step 1: receive described laser Output of laser current signal and monitor the power of Output of laser; And
Step 2: control the movement of the translation stage that is fixed with dispersive compensation element of laser power and described laser according to the current signal of the Output of laser of the laser receiving and the laser power monitoring.
9. method according to claim 8, wherein, whether described step 2 comprises according to the current signal of described laser and laser power and judges laser locked mode monitor power and change, and control laser power and translation stage according to described judged result.
10. method according to claim 8 or claim 9, wherein, described step 2 comprise when the signal of telecommunication receiving be not that locked mode signal and/or power is not while remaining on maximum, thereby mobile described translation stage starts the locked mode of described laser and regulates described laser power, and when the described signal receiving be locked mode signal and the described laser power that monitors while remaining on maximum, stop regulating described laser power and described translation stage stopped mobile.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242022A (en) * | 2014-09-26 | 2014-12-24 | 天津大学 | Real-time monitoring, warning and handling system of mode-locked laser status |
| CN105576491A (en) * | 2016-03-14 | 2016-05-11 | 大恒新纪元科技股份有限公司 | Femtosecond laser oscillator |
| CN107658687A (en) * | 2016-07-25 | 2018-02-02 | 中国科学院物理研究所 | The self-starting femtosecond titanium precious stone laser oscillator of synchronous pump |
| CN113206433A (en) * | 2021-04-30 | 2021-08-03 | 佛山帕科斯激光技术有限公司 | High-stability ultraviolet pulse laser based on self-feedback adjustment and laser generation method |
| CN115799969A (en) * | 2022-12-29 | 2023-03-14 | 北京锐德康科技有限公司 | Automatic mode locking self-checking femtosecond laser and automatic mode locking self-checking method |
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| US4815080A (en) * | 1986-05-14 | 1989-03-21 | Centre National De La Recherche Scientifique | Laser providing stable femtosecond pulses |
| US5383198A (en) * | 1993-10-25 | 1995-01-17 | Cornell Research Foundation, Inc. | Self-starting mode-locked ring cavity laser |
| CN1233869A (en) * | 1998-04-29 | 1999-11-03 | 中国科学院福建物质结构研究所 | Self-mode-locking laser |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242022A (en) * | 2014-09-26 | 2014-12-24 | 天津大学 | Real-time monitoring, warning and handling system of mode-locked laser status |
| CN104242022B (en) * | 2014-09-26 | 2017-08-29 | 天津大学 | Mode-locked laser status real time monitor alarm treatment system |
| CN105576491A (en) * | 2016-03-14 | 2016-05-11 | 大恒新纪元科技股份有限公司 | Femtosecond laser oscillator |
| WO2017156935A1 (en) * | 2016-03-14 | 2017-09-21 | 大恒新纪元科技股份有限公司 | Femtosecond laser oscillator |
| US10601197B2 (en) | 2016-03-14 | 2020-03-24 | Daheng New Epoch Technology Inc. | Femtosecond laser oscillator |
| CN107658687A (en) * | 2016-07-25 | 2018-02-02 | 中国科学院物理研究所 | The self-starting femtosecond titanium precious stone laser oscillator of synchronous pump |
| CN113206433A (en) * | 2021-04-30 | 2021-08-03 | 佛山帕科斯激光技术有限公司 | High-stability ultraviolet pulse laser based on self-feedback adjustment and laser generation method |
| CN115799969A (en) * | 2022-12-29 | 2023-03-14 | 北京锐德康科技有限公司 | Automatic mode locking self-checking femtosecond laser and automatic mode locking self-checking method |
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Application publication date: 20140122 |