CN108075349A - A kind of picosecond laser of conveniently adjusted laser pulse width - Google Patents
A kind of picosecond laser of conveniently adjusted laser pulse width Download PDFInfo
- Publication number
- CN108075349A CN108075349A CN201611004485.7A CN201611004485A CN108075349A CN 108075349 A CN108075349 A CN 108075349A CN 201611004485 A CN201611004485 A CN 201611004485A CN 108075349 A CN108075349 A CN 108075349A
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- China
- Prior art keywords
- laser
- picosecond
- prism
- pulse width
- mirror
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/71—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited
- G01N21/718—Laser microanalysis, i.e. with formation of sample plasma
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
Abstract
A kind of picosecond laser of conveniently adjusted laser pulse width, it is included in the pump laser diode set gradually on laser outgoing route, convergent lens, laser crystal, speculum, semiconductor saturable absorbing mirror, prism, end mirror, and wherein prism is to be placed on the prism pair that relative position can be adjusted on motorized precision translation stage.Wherein the present invention can be used for any suitable picosecond laser, as long as pump laser diode and laser crystal, which match, can be obtained by corresponding laser output wavelength.Since the picosecond laser of the present invention can realize that consecutive variations, conduct Laser induced plasma spectroscopy analytical equipment (LIBS) light source detect laser pulse width for molten steel sample composition from 20 picoseconds to 200 picoseconds, can improve accuracy.
Description
Technical field
The application field of the present invention picosecond swashs for steel samples composition detection more particularly to conveniently adjusted laser pulse width
Light device and its Laser induced plasma spectroscopy analytical equipment (LIBS) light source as induced with laser light source pulsewidth consecutive variations
Purposes, for the real-time online of steel samples ingredient detect.
Background technology
Laser-induced plasma spectroscopy (Laser Induced Plasma Spectroscopy, LIPS) is also referred to as
Make laser induced breakdown spectroscopy (Laser Induced Breakdown Spectroscopy, LIBS), be a kind of to swash
Light induces the Atomic Emission Spectral Analysis method for generating laser plasma as excitaton source, is based on laser and substance phase interaction
With physics and the elemental composition of spectroscopy and concentration analysis technology.LIPS is by by the laser beam of a branch of high-energy short pulse
It focuses on sample to be detected, and then generates high-temperature high-density and by free electron, ion and former molecular laser etc.
Gas ions, the process finally analyzed the plasma radiation spectrum.This method has the advantages that many uniquenesses, such as
Operation is easily, sample treatment is simple, detection object diversification (solid, liquid, gas, aerosol etc.), can the multielement same time-division
Analyse, be similar to non-destructive testing characteristic, can be most on detection elements periodic table element, have higher sensitivity,
Without the pure optical means contacted with sample, the ability that can be detected at a distance etc..
At present, induced with laser light source pulsewidth be the Laser induced plasma spectroscopy analytical equipment of fixed picosecond numerical value
Occur, but using the laser of single pulsewidth as induced with laser light source, can not system the change of analysis induced with laser light source pulsewidth
Change the influence to generating laser induced plasma effect.
The content of the invention
Due to existing measuring method have more than shortcoming, in order to explore the ultra-short pulse laser of distinct pulse widths to steel
Iron sample testing result, we have developed a kind of new realization laser pulse width consecutive variations in picosecond time section a certain range
The light source of Laser induced plasma spectroscopy analytical equipment.A pair of of rib is added in the existing all-solid-state picosecond laser oscillator of the present invention
Mirror realizes the light source as Laser induced plasma spectroscopy analytical equipment by adjusting prism to the chirp numerical value of introducing
Laser pulse width picosecond range from 20 picoseconds to 200 picoseconds consecutive variations.
General picosecond laser oscillator is without dispersion compensation, it is already possible to stable output Ps Laser Pulse, but
The Ps Laser Pulse pulsewidth for being output is fixed value, it is not possible to be adjusted.The present invention is in oscillator by adjusting prism pair
Relative position can continuously change laser pulse width, and repeatedly just to form laser defeated since laser beam is round-trip in oscillator
Go out and the quality of laser beam can be adjusted voluntarily in round-trip, so the quality of outgoing laser beam will not be subject to laser pulse width to change
Influence, such laser beam pass through chirped pulse amplification system, can realize final output laser pulse width variation and light beam matter
Amount does not change.
In order to overcome the shortcoming of existing measuring method, also for explore distinct pulse widths ultra-short pulse laser to steel
Iron sample testing result, the present invention, which provides, a kind of new may be used as Laser induced plasma spectroscopy analytical equipment (LIBS) light
The picosecond laser that can conveniently adjust laser pulse width in source, including pump laser diode, convergent lens, laser crystal,
Speculum, prism, end mirror and semiconductor saturable absorbing mirror, wherein prism can adjust phase to be placed on motorized precision translation stage
To the prism pair of position, the wherein present invention can be used for any suitable picosecond laser, if pump laser diode and swash
Luminescent crystal, which matches, can be obtained by corresponding laser output wavelength.
To achieve the above object, the technical solution taken in the present invention is as follows：
A kind of picosecond laser of conveniently adjusted laser pulse width, is included in the pump set gradually on laser outgoing route
Pu laser diode, convergent lens, laser crystal, speculum, semiconductor saturable absorbing mirror, prism, end mirror, wherein prism
To be placed on the prism pair that relative position can be adjusted on motorized precision translation stage.Wherein the present invention can be used for any suitable picosecond swash
Light device, as long as pump laser diode and laser crystal, which match, can be obtained by corresponding laser output wavelength.
Prism is to including the first prism and the second prism, and to export, laser is unaffected to be the adjusting range of relative position
Border, that is to say, that monitor the pulsewidth of output laser simultaneously by autocorrelation function analyzer when adjusting prism to relative position, simultaneously
The position of prism is finely tuned, can all around be adjusted, it is ensured that it can be seen that there is the waveform of laser pulse width on autocorrelation function analyzer, it is impossible to
There is the situation that laser waveform is lost on autocorrelation function analyzer.
Preferably, the picosecond laser is the full-solid-state pico-second laser device of end pumping.
Preferably, the plane of the laser crystal in itself is an end face of laser cavity, another end face is end face
Mirror, preferably transmitance are 5% end face outgoing mirror.
Preferably, the semiconductor saturable absorbing mirror is used for generating skin optical signal.
Preferably, the pump laser diode is pumping source.
Preferably, the Mode Coupling of convergent lens beam cross section on pumping laser and laser crystal.
Preferably, the pump laser diode wavelength is 808 nanometers, and the wavelength of picosecond laser output laser is 1053
Nanometer.
Preferably, the laser crystal is Nd:YAG.
Another aspect of the present invention provides above-mentioned picosecond laser and is set as Laser induced plasma spectroscopy analysis
Standby (LIBS) light source is used for the purposes of molten steel sample composition detection.
The Laser induced plasma spectroscopy analytical equipment can include the above-mentioned picosecond laser of the present invention, laser imports
System, spectrum export and collection system, beam splitting system and spectrum acquisition system, wherein, spectrum export and collection system include light
Spectrum export subsystem and spectral collection subsystem and, wherein pulse laser and spectrum acquisition system is by same impulse generator
Instruction control is sent, laser transmitting laser is focused to by laser import system at sample, and sample surfaces is made to form plasma
Body, generation induced with laser spectrum are simultaneously exported generated fluorescence to spectral collection subsystem by spectrum export subsystem, are led to
It crosses to calculating, processing and the analysis for collecting spectrum so as to the qualitative and quantitative testing of contained element progress in sample.
Advantageous effect of the invention
Benefit of the invention is that it can realize that a laser pulse width is lured from 20 picoseconds to the laser of 200 picoseconds of consecutive variations
The light source of plasma spectroscopy equipment is led, so as to be lured for the analysis induced with laser light source pulse width variations of system generating laser
The influence for leading plasma effect is laid a good foundation, as Laser induced plasma spectroscopy analytical equipment (LIBS) light source
When being detected for molten steel sample composition, laser signal intensity enhancing can improve measuring accuracy.The original of such benefit can be generated
Because being that prism to being applied to picosecond laser oscillator, chirp number can be adjusted by the relative position for adjusting prism pair
Value come realize laser pulse width from 20 picoseconds to 200 picoseconds consecutive variations, so as to fulfill a laser pulse width from 20 picoseconds to 200 skins
Second can be with the light source of the Laser induced plasma spectroscopy analytical equipment of consecutive variations.
Description of the drawings
Fig. 1 is the structure diagram of laser system of the present invention.
1 is pump laser diode；
2 be convergent lens；
3 be laser crystal；
4 be speculum；
5 be prism；
6 be end mirror；
7 be semiconductor saturable absorbing mirror.
Fig. 2 is the measurement result figure of one embodiment of the invention, it is shown that as prism changes the opposite of position, finally
The picosecond laser pulsewidth exported from oscillator changes to 200 picoseconds from 20 picoseconds, and the unit of laser pulse width is picosecond in figure.
Specific embodiment
The present invention is illustrated by specific embodiment below in conjunction with attached drawing, those skilled in the art will appreciate that this is said
The bright purpose being given for example only, does not form any limitation on the scope of the present invention.
As shown in Figure 1, the present invention relates to a kind of picosecond lasers of conveniently adjusted laser pulse width, it is defeated to be included in laser
Pump laser diode 1, convergent lens 2, laser crystal 3, speculum 4, the semiconductor saturable set gradually on outbound path is inhaled
Mirror 7, prism 5, end mirror 6 are received, wherein prism is to be placed on the prism pair that relative position can be adjusted on motorized precision translation stage.
Prism is to including the first prism and the second prism, and to export, laser is unaffected to be the adjusting range of relative position
Border, that is to say, that monitor the pulsewidth of output laser simultaneously by autocorrelation function analyzer when adjusting prism to relative position, simultaneously
The position of prism is finely tuned, can all around be adjusted, it is ensured that it can be seen that there is the waveform of laser pulse width on autocorrelation function analyzer, it is impossible to
There is the situation that laser waveform is lost on autocorrelation function analyzer.
Preferably, the picosecond laser is the full-solid-state pico-second laser device of end pumping.
Preferably, the plane of the laser crystal in itself is an end face of laser cavity, another end face is end face
Mirror, preferably transmitance are 5% end face outgoing mirror.
Preferably, the semiconductor saturable absorbing mirror is used for generating skin optical signal.
Preferably, the pump laser diode is pumping source.
Preferably, the Mode Coupling of convergent lens beam cross section on pumping laser and laser crystal.
Preferably, the pump laser diode wavelength is 808 nanometers, and the wavelength of picosecond laser output laser is 1053
Nanometer.
Preferably, the laser crystal is Nd:YAG.
Another aspect of the present invention provides above-mentioned picosecond laser and is set as Laser induced plasma spectroscopy analysis
Standby (LIBS) light source is used for the purposes of molten steel sample composition detection.
The Laser induced plasma spectroscopy analytical equipment can include the above-mentioned picosecond laser of the present invention, laser imports
System, spectrum export and collection system, beam splitting system and spectrum acquisition system, wherein, spectrum export and collection system include light
Spectrum export subsystem and spectral collection subsystem and, wherein pulse laser and spectrum acquisition system is by same impulse generator
Instruction control is sent, laser transmitting laser is focused to by laser import system at sample, and sample surfaces is made to form plasma
Body, generation induced with laser spectrum are simultaneously exported generated fluorescence to spectral collection subsystem by spectrum export subsystem, are led to
It crosses to calculating, processing and the analysis for collecting spectrum so as to the qualitative and quantitative testing of contained element progress in sample.
Since the present invention can adjust in the laser cavity of picosecond laser oscillator by adjusting the relative position of prism pair
Whole chirp numerical value come realize laser pulse width from 20 picoseconds to 200 picoseconds consecutive variations, so as to fulfill a laser pulse width from 20 skins
Second can be with the light source of the Laser induced plasma spectroscopy analytical equipment of consecutive variations to 200 picoseconds.Further, it is of the invention
It can be used for any suitable picosecond laser, can be obtained by accordingly as long as pump laser diode and laser crystal match
Laser output wavelength.
Inventor has built experimental provision and has carried out experimental verification according to the present invention, and experiment results are as shown in Fig. 2, aobvious
Show that the opposite variation to position, the picosecond laser pulsewidth finally exported from oscillator are continuously changed to from 20 picoseconds with prism
200 picoseconds, the unit of laser pulse width is picosecond in figure.
Claims (9)
1. a kind of picosecond laser of conveniently adjusted laser pulse width, is included in the pumping set gradually on laser outgoing route
Laser diode, convergent lens, laser crystal, speculum, semiconductor saturable absorbing mirror, prism, end mirror, wherein prism are
The prism pair of relative position can be adjusted by being placed on motorized precision translation stage, prism is opposite to including the first prism and the second prism
The adjusting range of position is unaffected for border to export laser.
2. picosecond laser according to claim 1, wherein, the picosecond laser is all solid state picosecond of end pumping
Laser.
3. picosecond laser according to claim 1 or 2, wherein, the plane of the laser crystal in itself is laser
One end face of chamber, another end face are end mirror, and preferably transmitance is 5% end face outgoing mirror.
4. picosecond laser according to any one of claim 1-3, wherein, the semiconductor saturable absorbing mirror is used for
Generate skin optical signal.
5. according to the picosecond laser any one of claim 1-4, wherein, the pump laser diode is pumping
Source.
6. according to the picosecond laser any one of claim 1-5, wherein, the convergent lens for pumping laser and
The Mode Coupling of beam cross section on laser crystal.
7. according to the picosecond laser any one of claim 1-6, wherein, the pump laser diode wavelength is
808 nanometers, the wavelength of picosecond laser output laser is 1053 nanometers.
8. according to the picosecond laser any one of claim 1-7, wherein, the laser crystal is Nd:YAG.
9. the picosecond laser any one of claim 1-8 is as Laser induced plasma spectroscopy analytical equipment
(LIBS) light source is used for the purposes of molten steel sample composition detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611004485.7A CN108075349A (en) | 2016-11-15 | 2016-11-15 | A kind of picosecond laser of conveniently adjusted laser pulse width |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611004485.7A CN108075349A (en) | 2016-11-15 | 2016-11-15 | A kind of picosecond laser of conveniently adjusted laser pulse width |
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| Publication Number | Publication Date |
|---|---|
| CN108075349A true CN108075349A (en) | 2018-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611004485.7A Pending CN108075349A (en) | 2016-11-15 | 2016-11-15 | A kind of picosecond laser of conveniently adjusted laser pulse width |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115120249A (en) * | 2022-05-19 | 2022-09-30 | 深圳未来脑律科技有限公司 | Bimodal brain function imaging device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1211095A (en) * | 1998-10-06 | 1999-03-17 | 中国科学院西安光学精密机械研究所 | Fully solid self mode-locked femto second laser |
| JP2006216984A (en) * | 2006-04-12 | 2006-08-17 | Komatsu Ltd | Method for optimizing wave front of narrow band oscillation excimer laser |
| CN101621172A (en) * | 2008-06-30 | 2010-01-06 | 中国科学院物理研究所 | Titanium-doped sapphire laser for generating high repetition frequency few-cycle femtosecond pulses |
| CN102944931A (en) * | 2012-11-19 | 2013-02-27 | 中国电子科技集团公司第十一研究所 | Precise compensator for optical path |
| CN103794977A (en) * | 2014-01-23 | 2014-05-14 | 中国电子科技集团公司第十一研究所 | Passive mode-locking laser with tunable pulse width |
| CN103972776A (en) * | 2014-05-20 | 2014-08-06 | 西安电子科技大学 | Laser diode pumping Kerr-lens mode locking Yb:(YLa)2O3 all-solid-state femtosecond laser device |
-
2016
- 2016-11-15 CN CN201611004485.7A patent/CN108075349A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1211095A (en) * | 1998-10-06 | 1999-03-17 | 中国科学院西安光学精密机械研究所 | Fully solid self mode-locked femto second laser |
| JP2006216984A (en) * | 2006-04-12 | 2006-08-17 | Komatsu Ltd | Method for optimizing wave front of narrow band oscillation excimer laser |
| CN101621172A (en) * | 2008-06-30 | 2010-01-06 | 中国科学院物理研究所 | Titanium-doped sapphire laser for generating high repetition frequency few-cycle femtosecond pulses |
| CN102944931A (en) * | 2012-11-19 | 2013-02-27 | 中国电子科技集团公司第十一研究所 | Precise compensator for optical path |
| CN103794977A (en) * | 2014-01-23 | 2014-05-14 | 中国电子科技集团公司第十一研究所 | Passive mode-locking laser with tunable pulse width |
| CN103972776A (en) * | 2014-05-20 | 2014-08-06 | 西安电子科技大学 | Laser diode pumping Kerr-lens mode locking Yb:(YLa)2O3 all-solid-state femtosecond laser device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115120249A (en) * | 2022-05-19 | 2022-09-30 | 深圳未来脑律科技有限公司 | Bimodal brain function imaging device |
| CN115120249B (en) * | 2022-05-19 | 2023-08-15 | 深圳未来脑律科技有限公司 | Bimodal brain function imaging device |
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Application publication date: 20180525 |