CN104625422A - Method for assisting metal processing based on electronic dynamic control of ethanol solution - Google Patents
Method for assisting metal processing based on electronic dynamic control of ethanol solution Download PDFInfo
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- CN104625422A CN104625422A CN201410848355.6A CN201410848355A CN104625422A CN 104625422 A CN104625422 A CN 104625422A CN 201410848355 A CN201410848355 A CN 201410848355A CN 104625422 A CN104625422 A CN 104625422A
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Abstract
The invention relates to a method for assisting metal processing based on electronic dynamic control of an ethanol solution and belongs to the field of femtosecond laser application. Aiming at the problems of low machining efficiency and poor quality of metal processing conducted in a traditional femtosecond laser air environment, ethyl alcohol is adopted for assisting processing, so that processing efficiency is improved; meanwhile, femtosecond dipulse is adopted to replace traditional femtosecond laser, local electron density and follow-up phase change process can be controlled during femtosecond laser and metal processing, and then processing quality is improved to a certain extent.
Description
Technical field
The present invention relates to a kind of based on dynamic control ethanolic solution assistant metal processing method, belong to femtosecond laser application.
Background technology
In the micro-nano technology of metal material manufactures, obtain higher crudy while obtaining high working (machining) efficiency, pursued always.And in the processing of traditional air ambient, due to the deposition of femtosecond laser energy on metal sample surface, in the process of laser ablation, the splash of stronger fuel factor and ablation material can cause the accumulation of processed sample surface double teeming, thus formation re cast layer, and then affect crudy.
Research in the past shows, during intra two-pulse processing metallic, significantly can affect the interaction process of femtosecond laser and material, good crudy can be obtained by the phase transition process changing local electronic density and material, but this make working (machining) efficiency greatly reduce.And when increasing laser energy and obtaining higher working (machining) efficiency, often make crudy reduce.By changing external environment, as being placed into by metal sample material in ethanolic solution and using conventional laser to add man-hour, can working (machining) efficiency be improved, but well not improve intermetallic composite coating quality.
Therefore, currently under same laser energy, both can obtain good suface processing quality in the urgent need to one, the method for working (machining) efficiency can be improved again.
Summary of the invention
The object of the invention is cannot realize to solve existing manufacturing process the problem that metal micro-nano technology quality and efficiency takes into account, providing a kind of based on dynamic control alcoholic environment assistant metal processing method.Be intended under ethanol is auxiliary, change high-order harmonics spectrum process by the intra two-pulse of time domain shaping, and then ensure working (machining) efficiency while improving metal surface crudy.
The object of the invention is to be realized by following technology.
Based on dynamic control alcoholic environment assistant metal processing method, concrete steps are as follows:
Step one, by pulse shaper (pulse shaper), traditional femtosecond laser is shaped as femtosecond double pulses in time domain, and the time interval of two subpulses is between 0 ~ 3ps, and time delay is adjustable, make to change the instantaneous local electronic density in femtosecond laser and material effects process and follow-up phase transition process in process;
Step 2, by metal sample fixed placement in being equipped with in the container in ethanolic solution, make ethanolic solution do not have metal sample surface;
The femtosecond double pulses of step 3, employing step one gained is processed metal sample.
Ethanolic solution described in step 2 did not have the distance of sample surfaces to be 3 millimeters.
Realize the device of said method, comprising: ultrafast laser, half-wave plate, polarizer, energy attenuation sheet, pulse shaper, mechanical switch, speculum, condenser lens, container, sample to be processed, mobile platform, computer.
Annexation: femto-second laser produces femto-second laser pulse after half-wave plate, polarizer, regulates laser energy by energy attenuation sheet, laser beam is divided into energy Ratios to be that two of 1:1 restraints subpulses by pulse shaper.The laser pulse of shaping changes laser propagation direction through speculum, focuses on sample to be processed finally by object lens, and container, can the container bottom of storing solution, be fixed on sextuple mobile platform by sample fixed placement to be processed.Wherein femto-second laser, pulse shaper, mechanical switch, mobile platform control by computer.
The course of work is:
Step one, design femtosecond double pulses, by pulse shaper (pulse shaper), traditional femtosecond laser is shaped as femtosecond double pulses in time domain, and the time interval of two subpulses is between 0 ~ 3ps, and time delay is adjustable, make to change the instantaneous local electronic density in femtosecond laser and material effects process and follow-up phase transition process in process.
Step 2, by specimen material fixed placement in being equipped with in the glassware in ethanolic solution, makes ethanolic solution not there be sample surfaces;
Step 3, intra two-pulse step one obtained incides in processing object lens, and focuses on sample surfaces;
Step 4, obtains different time delay by regulating impulse reshaper, and adjusts the laser energy by pulse shaper by adjustment optics, and then processes metal material.
Beneficial effect
1, of the present invention based on dynamic control alcoholic environment assistant metal processing method, the intra two-pulse of time domain shaping is used to replace traditional single pulse, by instantaneous local electronic density and follow-up phase transition process in regulation and control process, the problem of the low crudy brought in process can be overcome, re cast layer height reduction about 76% around machining area can be made.
2, of the present invention based on dynamic control alcoholic environment assistant metal processing method, while use intra two-pulse, by ethanolic solution secondary process, while raising crudy, compare tradition processing, greatly can improve working (machining) efficiency under identical energy, make processing crater depth improve at least 1.4 times.
Accompanying drawing explanation
Fig. 1 is experiment light path schematic diagram of the present invention;
Fig. 2 is in instantiation 1, the three-dimensional experiment design sketch of traditional femtosecond laser processing crater structure.
Fig. 3 is in instantiation 1, the experiment profile diagram of traditional femtosecond laser processing crater structure.
Fig. 4 is in instantiation 1, adopts the three-dimensional experiment design sketch of the inventive method processing crater structure.
Fig. 5 is in instantiation 1, adopts the experiment profile diagram of the inventive method processing crater structure.
Wherein, 1-ultrafast laser, 2-half-wave plate, 3-polarizer, 4-energy attenuation sheet, 5-pulse shaper, 6-mechanical switch, 7-speculum, 8-condenser lens, 9-container, 10-sample to be processed, 11-mobile platform, 12-computer.
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the present invention will be further described.
Embodiment 1
Based on dynamic control alcoholic environment assistant metal processing method, concrete steps are as follows:
Step one, by pulse shaper (pulse shaper), traditional femtosecond laser is shaped as femtosecond double pulses in time domain, and the time interval of two subpulses is between 0 ~ 3ps, and time delay is adjustable, make to change the instantaneous local electronic density in femtosecond laser and material effects process and follow-up phase transition process in process;
Step 2, by metal sample aluminium fixed placement in being equipped with in the container in ethanolic solution, make ethanolic solution do not have metal sample surface 3mm;
The femtosecond double pulses of step 3, employing step one gained is processed metal sample.
Realize the device of said method, comprising: ultrafast laser 1, half-wave plate 2, polarizer 3,4-energy attenuation sheet, pulse shaper 5, electric-controlled switch 6, speculum 7, condenser lens 8, glassware 9, sample to be processed 10, mobile flat 11, computer 12.
Fs-laser system adopts femtosecond laser to be linearly polarized laser, and centre wavelength is 800nm, pulse width 50fs, repetition rate 20Hz, pulse number 20, and processed sample is metallic aluminium.
Intra two-pulse is that the MIIPSbox pulse shaper produced by Biophotonic company of the U.S. is obtained, and traditional pulse is shaped to two subpulses, subpulse can regulate separately time delay.
Annexation: femto-second laser 1 produces femto-second laser pulse after half-wave plate 2, polarizer 3, regulates laser energy by energy attenuation sheet 4, laser beam is divided into energy Ratios to be that two of 1:1 restraints subpulses by pulse shaper 5.The laser pulse of shaping changes laser propagation direction through speculum 7, focuses on sample 10 to be processed finally by object lens 8, and container 9 bottom the container 9 of storing solution, can be fixed on sextuple mobile platform 11 by sample 10 fixed placement to be processed.Wherein femto-second laser 1, pulse shaper 5, mechanical switch 6, mobile platform 11 control by computer 12.
The course of work is:
Step one, opens femto-second laser and produces traditional pulse, by regulating attenuator control by the energy of pulse shaper at below 100mw, and protection pulse shaper while meeting pulse shaper entrance power.
Step 2, setting pulse shaper parameter, be time domain dipulse by the traditional single pulse laser shaping entering pulse shaper, energy distribution ratio is 1:1, and two sons control at 0-3ps interpulse time delay.
Step 3, by metal sample aluminium fixed placement in the bottom of glassware, pours into ethanolic solution in glassware, controls solution height and does not have sample surfaces 3 millimeters of positions, then by glassware fixed placement on a mobile platform.
Step 4, is incorporated into the double-pulse laser by pulse shaper in the planoconvex spotlight of 100 millimeters of focal lengths, and focuses it on the surface of metal sample.
Step 5, is set to 0.6J/cm2 by the laser flux inciding sample surfaces, changes the time delay of dipulse and to control incident pulse number by electric-controlled switch be 20, can form the crater structure of ablation at metallic aluminum surface.
By fixing on a mobile platform for the metallic aluminium be positioned in air, process by above-mentioned steps (4), (5), obtain aerial processing result.
Use the crater that traditional single pulse laser obtains in atmosphere, recording ablation depth by AFM is 580nm, and re cast layer height is 312nm.And use in alcoholic environment dipulse time delay between 0-1ps time, the crater depth obtained is 1000-1500nm, and re cast layer height is between 200-300nm; Between dipulse 1-2ps time delay, ablation depth is 810-1000nm, and re cast layer height is about 74nm; Between dipulse 2-3ps time delay, ablation depth is 650-810nm, and re cast layer height is about 70nm.
Embodiment 2
Based on dynamic control alcoholic environment assistant metal processing method, concrete steps are as follows:
Step one, by pulse shaper (pulse shaper), traditional femtosecond laser is shaped as femtosecond double pulses in time domain, and the time interval of two subpulses is between 0 ~ 3ps, and time delay is adjustable, make to change the instantaneous local electronic density in femtosecond laser and material effects process and follow-up phase transition process in process;
Step 2, by metal sample copper fixed placement in being equipped with in the container in ethanolic solution, make ethanolic solution do not have metal sample surface 3mm;
The femtosecond double pulses of step 3, employing step one gained is processed metal sample.
Realize the device of said method, comprising: ultrafast laser 1, half-wave plate 2, polarizer 3,4-energy attenuation sheet, 5-pulse shaper, 6-electric-controlled switch, 7-speculum, 8-condenser lens, 9-glassware, 10-sample to be processed, 11-mobile platform, 12-computer.
Fs-laser system adopts femtosecond laser to be linearly polarized laser, and centre wavelength is 800nm, pulse width 50fs, repetition rate 20Hz, pulse number 50, and processed sample is metallic copper.
Intra two-pulse is that the MIIPSbox pulse shaper produced by Biophotonic company of the U.S. is obtained, and traditional pulse is shaped to two subpulses, subpulse can regulate separately time delay.
Annexation: femto-second laser 1 produces femto-second laser pulse after half-wave plate 2, polarizer 3, regulates laser energy by energy attenuation sheet 4, laser beam is divided into energy Ratios to be that two of 1:1 restraints subpulses by pulse shaper 5.The laser pulse of shaping changes laser propagation direction through speculum 7, focuses on sample 10 to be processed finally by object lens 8, and container 9 bottom the container 9 of storing solution, can be fixed on sextuple mobile platform 11 by sample 10 fixed placement to be processed.Wherein femto-second laser 1, pulse shaper 5, mechanical switch 6, mobile platform 11 control by computer 12.
The course of work is:
Step one, opens femto-second laser and produces traditional pulse, by regulating attenuator control by the energy of pulse shaper at below 100mw, and protection pulse shaper while meeting pulse shaper entrance power.
Step 2, setting pulse shaper parameter, be time domain dipulse by the traditional single pulse laser shaping entering pulse shaper, energy distribution ratio is 1:1, and two sons control at 0-3ps interpulse time delay.
Step 3, by metal sample copper fixed placement in the bottom of glassware, pours into ethanolic solution in glassware, controls solution height and does not have sample surfaces 3 millimeters of positions, then by glassware fixed placement on a mobile platform.
Step 4, is incorporated into the double-pulse laser by pulse shaper in the planoconvex spotlight of 100 millimeters of focal lengths, and focuses it on the surface of metal sample.
Step 5, is set to 1J/cm by the laser flux inciding sample surfaces
2, change the time delay of dipulse and to control incident pulse number by electric-controlled switch be 50, the crater structure of ablation can be formed at copper surface.
By fixing on a mobile platform for the metallic copper be positioned in air, process by above-mentioned steps (4), (5), obtain aerial processing result.
Use the crater that traditional single pulse laser obtains in atmosphere, recording ablation depth by AFM is 822nm, and re cast layer height is 422nm.Use the inventive method when dipulse 2ps time delay, ablation depth is 1229nm, and re cast layer height is 65nm.
From embodiment one, use the inventive method dipulse time delay for 1-2ps between time, higher working (machining) efficiency (ablation depth improves at least 1.4 times) can be obtained, also can obtain good crudy (re cast layer height reduces about 76%).
From embodiment two, when using this method processing metal copper, while the higher working (machining) efficiency of acquisition, crudy is also improved significantly.
Claims (4)
1., based on dynamic control alcoholic environment assistant metal processing method, it is characterized in that: concrete steps are as follows:
Step one, by pulse shaper, traditional femtosecond laser is shaped as femtosecond double pulses in time domain, and the time interval of two subpulses is between 0 ~ 3ps, and time delay is adjustable, make to change the instantaneous local electronic density in femtosecond laser and material effects process and follow-up phase transition process in process;
Step 2, by metal sample fixed placement in being equipped with in the container in ethanolic solution, make ethanolic solution do not have metal sample surface;
The femtosecond double pulses of step 3, employing step one gained is processed metal sample.
2. as claimed in claim 1 based on dynamic control alcoholic environment assistant metal processing method, it is characterized in that: the ethanolic solution described in step 2 did not have the distance of sample surfaces to be 3 millimeters.
3. realize, as claimed in claim 1 based on the device of dynamic control alcoholic environment assistant metal processing method, it is characterized in that: comprising: ultrafast laser (1), half-wave plate (2), polarizer (3), energy attenuation sheet (4), pulse shaper (5), mechanical switch (6), speculum (7), condenser lens (8), container (9), sample to be processed (10), mobile platform (11), computer (12); Femto-second laser (1) produces femto-second laser pulse after half-wave plate (2), polarizer (3), regulate laser energy by energy attenuation sheet (4), laser beam is divided into energy Ratios to be that two of 1:1 restraints subpulses by pulse shaper (5); The laser pulse of shaping changes laser propagation direction through speculum (7), focus on sample to be processed (10) finally by object lens (8), sample to be processed (10) fixed placement can storing solution container (9) bottom, container (9) is fixed on sextuple mobile platform (11); Wherein femto-second laser (1), pulse shaper (5), mechanical switch (6), mobile platform (11) control by computer (12).
4., as claimed in claim 3 based on the device of dynamic control alcoholic environment assistant metal processing method, it is characterized in that the course of work is:
Step one, design femtosecond double pulses, by pulse shaper (pulse shaper), traditional femtosecond laser is shaped as femtosecond double pulses in time domain, and the time interval of two subpulses is between 0 ~ 3ps, and time delay is adjustable, make to change the instantaneous local electronic density in femtosecond laser and material effects process and follow-up phase transition process in process;
Step 2, by specimen material fixed placement in being equipped with in the glassware in ethanolic solution, makes ethanolic solution not there be sample surfaces;
Step 3, intra two-pulse step one obtained incides in processing object lens, and focuses on sample surfaces;
Step 4, obtains different time delay by regulating impulse reshaper, and adjusts the laser energy by pulse shaper by adjustment optics, and then processes metal material.
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| CN111001929A (en) * | 2019-12-11 | 2020-04-14 | 西安交通大学 | Method for preparing LISS on surface of substrate based on alcohol-assisted femtosecond laser |
| CN111992876A (en) * | 2020-08-31 | 2020-11-27 | 北京理工大学重庆创新中心 | Complex three-dimensional micropore machining method based on laser and liquid interaction regulation and control |
| CN113399823A (en) * | 2021-05-28 | 2021-09-17 | 西北工业大学 | Preparation device and preparation method of lens array mirror surface |
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