CN107565371A - A kind of subpulse laser generation method based on double Q-regulating techniques - Google Patents
A kind of subpulse laser generation method based on double Q-regulating techniques Download PDFInfo
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- CN107565371A CN107565371A CN201710844184.3A CN201710844184A CN107565371A CN 107565371 A CN107565371 A CN 107565371A CN 201710844184 A CN201710844184 A CN 201710844184A CN 107565371 A CN107565371 A CN 107565371A
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Abstract
A kind of subpulse laser generation method based on double Q-regulating techniques refers to, using double Q-regulating techniques, during low-repetition-frequency Q-switch modulates pulsed laser output, be modulated again using high repetition frequency Q-switch, and then obtains multiple subpulse laser outputs.The present invention is simple in construction, easily operated, can be applied to Materialbearbeitung mit Laserlicht field, multiple subpulses are applied on workpiece, become laser subpulse continuous action, reduce or eliminate plasma to caused interference in laser processing procedure, substantially increase the machining accuracy of material.
Description
Technical field
The invention belongs to laser technology field, more particularly to a kind of subpulse laser generation method based on double Q-regulating techniques,
The device used is solid laser device.
Background technology
Laser processing technology achieved rapid development in recent years, and Laser Processing has the characteristics of contactless, also simultaneously
With machining accuracy is high, processing object deformation is small and the advantages such as processing cost is low.And in laser processing procedure, peak value
Plasma caused by power laser greatly affects transmission of the laser energy to workpiece:(1) laser beam energy through etc.
Consumption increase is absorbed during gas ions, the effective energy for being delivered to workpiece is accordingly reduced.(2) negative lens effect of plasma causes
Laser beam produces deflection angle after passing through plasma, influences focus state of the laser beam in workpiece surface.
At present, the control method of photo plasma mainly has laser oscillating method, additional electromagnetic field control methods, blows auxiliary gas
Body method etc.(1).Laser oscillating method can obtain the weld seam of bigger depth ratio, but this method is not easily controlled in practical operation.
Additional electromagnetic field control methods refer to that method is simple, and cost is relatively low using additional electromagnetic field control plasma, but in practice
Using less, need further to be examined.Although plasma can be controlled by blowing auxiliary gas method, but this method offside is blown
The position of body, angle, pressure etc. have strict requirements.
The content of the invention
The present invention provides a kind of subpulse laser generation method based on double Q-regulating techniques, and this method is using double Q-switch devices
Part, tune Q is carried out to laser, in low-repetition-frequency Q-switch adjusts Q output procedures, entered again using the Q-switch of high repetition frequency
Row modulation, by Laser pulse modulator into multiple subpulses.
When being applied to workpiece, become laser subpulse continuous action, can effectively reduce or eliminate a giant-pulse laser
Act on plasma phenomenon caused by workpiece.
The purpose of the present invention is overcome in current laser processing procedure, high-peak power laser-produced plasma, is led
The shortcomings that causing Laser Processing efficiency to decline, resolves into multiple series of sub-pulses by a laser pulse, can reduce or eliminate photic
Plasma is to the interference in laser processing procedure.
The technical scheme of use is：
A kind of subpulse laser generation method based on double Q-regulating techniques, comprises the following steps：
Q is adjusted to produce pulsewidth by low-repetition-frequency first wider（20-50 nanoseconds）Giant-pulse, and then pass through high repetition frequency
Adjust Q to be modulated caused giant-pulse, most at last Laser pulse modulator into multiple subpulses.
The repetition rate of low-repetition-frequency Q-switch is 100-1kHz, and the repetition rate of high repetition frequency Q-switch is
200MHz-500MHz。
It the advantage is that：
Double Q-regulating techniques are formed using two Q-switch, the laser that double Q-regulating techniques are sent to laser bar carries out double modulation, so as to obtain
Much individual sub- pulse laser output.The present invention is simple in construction, and cost of manufacture is relatively low, easy to operation in industrialization practical application, can
The extensive use in field of laser processing, multiple subpulses are applied on workpiece, become laser subpulse continuous action, reduce or
Plasma is eliminated to caused interference in laser processing procedure, substantially increases the machining accuracy of material.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of the present invention 1.
Fig. 2 is the structural representation of the embodiment of the present invention 2.
Fig. 3 is that low-repetition-frequency adjusts Q output pulse waveform figures.
Fig. 4 is low-repetition-frequency and the double tune Q output pulse waveform figures of high repetition frequency.
Embodiment
Laser Q-switching, which refers to adopt, by some means or other makes resonator, in high loss low reactance-resistance ratio state, at this moment swash when pumping starts
The threshold value of light generation is very high, and particle density inverted population will not also produce vibration even if high level is run up to.When particle density is anti-
When revolution reaches its peak value, suddenly increase the Q values of chamber, the gain for causing laser medium is substantially exceeded into threshold value, extremely quickly
Generation vibration.At this moment energy possessed by the particle being stored in metastable state can be converted to the energy of photon, photon picture quickly
Snowslide is the same to be increased with high speed, and laser can export the laser giant-pulse of a peak power height, narrow width(2)。
Double Q-regulating techniques carry out double modulation to laser pulse, in low-repetition-frequency Q-switch 2 adjusts Q output procedures, utilize
High repetition frequency Q-switch 5 carries out secondary modulation, and the laser pulse that low-repetition-frequency Q-switch 2 is modulated to output is carried out carefully
Point, so as to by Laser pulse modulator into multiple subpulses.
(1) Liu Kun, Liu Jinhe, week are smooth etc., wait control (J) hot-working works of Laser Deep Penetration Welding photo plasmas
Skill, 2007,36 (23)：86-88.
(2) Zhou Ping Kun Principles of Laser (M) Beijing：National Defense Industry Press, 2007.
Embodiment 1
As shown in figure 1, a kind of subpulse laser generation method based on double Q-regulating techniques, comprises the following steps：Turn on the power out
Close, be slowly increased pumping voltage when not opening double Q-switch drivings, finely tuning the first total reflective mirror 1 and outgoing mirror 6 makes output light
Spot is in optimum state.
Then, low-repetition-frequency Q-switch driving 7 is opened, driving low-repetition-frequency Q-switch 2, now exports laser arteries and veins
It is as shown in Figure 3 to rush shape.
If 8 are driven to provide high repetition frequency driving by the synchronous high repetition frequency Q-switch of opening of synchronizer trigger 3 simultaneously
Signal drives high repetition frequency Q-switch 5, and now output laser pulse shape is illustrated in figure 4 multiple output laser subpulses
Oscillogram.Therefore, the double Q-regulating techniques being made up of low-repetition-frequency and high repetition frequency, i.e. low-repetition-frequency Q-switch 2 adjust Q
During pulsed laser output, high repetition frequency Q-switch 5 is modulated again, can be by Laser pulse modulator into more height
Pulse, so as to obtain multiple subpulse laser outputs.
The subpulse laser based on double Q-regulating techniques that a kind of subpulse laser generation method based on double Q-regulating techniques uses
Device, including it is the first total reflective mirror 1, low-repetition-frequency Q-switch 2, high repetition frequency Q-switch 5, laser bar 4, outgoing mirror 6, low heavy
Complex frequency Q-switch driving 7, high repetition frequency Q-switch driving 8 and synchronizer trigger 3, these described devices are known
Device.
Laser bar 4 can use Nd:YAG laser bars.
Low-repetition-frequency adjusts Q and high repetition frequency to adjust Q to form double tune Q, and the first total reflective mirror 1 and outgoing mirror 6 form laser
Resonator, wavelength are that 1064nm laser vibrates output in resonator.
First total reflective mirror 1 is concave mirror.
Synchronizer trigger 3 connects low-repetition-frequency Q-switch driving 7 and high repetition frequency Q-switch driving 8, realizes low
Repetition rate drives and the synchronous triggering of high repetition frequency driving and delays time to control.
Embodiment 2
Embodiment 2 and the embodiment of embodiment 1 are essentially identical, and its difference is that embodiment 2 is further fallen using chamber
Empty technology.Low-repetition-frequency Q-switch driving 7 is opened, driving low-repetition-frequency Q-switch 2 is worked so that low-repetition-frequency is adjusted
Q-switch 2 modulates giant-pulse laser.8 are driven to provide by the synchronous high repetition frequency Q-switch of opening of synchronizer trigger 3 simultaneously
High repetition frequency drive signal driving high repetition frequency Q-switch 5, high repetition frequency Q-switch 5 is in open mode, will be low
The laser pulse that repetition rate Q-switch 2 is modulated is finely divided, so that by Laser pulse modulator into multiple subpulses, due to height
Repetition rate Q-switch 5 can cause adjusting Q crystal to have Bragg diffraction effect, Suo Youyun under high repetition frequency drive signal
Row power is substantially diffracted into first and penetrates level, and the direction of propagation of multiple subpulse laser of acquisition, which can change, incides the 3rd
Total reflective mirror 9, reflexed on the 4th speculum 10, so resulted in the second total reflective mirror 11 by input path by the 3rd total reflective mirror 9
All luminous energy is poured out rapidly outside chamber out of resonator in the resonator formed with the 3rd total reflective mirror 9, finally gives more sub- arteries and veins
Impulse light output.
The subpulse laser based on double Q-regulating techniques that a kind of subpulse laser generation method based on double Q-regulating techniques uses
Device, the laser include the second total reflective mirror 11, laser bar 4, low-repetition-frequency Q-switch 2, high repetition frequency Q-switch 5, the
Three total reflective mirrors 9, low-repetition-frequency Q-switch driving 7, high repetition frequency Q-switch driving 8, synchronizer trigger 3 and the 4th are all-trans
Mirror 10, this device are known device.
3rd total reflective mirror 9 is the concave mirror that radius of curvature is 1 meter, and the 4th speculum 10 and the second speculum 11 are flat
Face speculum.
High repetition frequency Q-switch 5 is tiltedly placed in laser chamber with Bragg diffraction angle, and synchronizer trigger 3 connects
Low-repetition-frequency Q-switch driving 7 and high repetition frequency Q-switch driving 8, realize low-repetition-frequency driving and high repetition frequency
The synchronous triggering of driving and delays time to control.
Claims (7)
1. a kind of subpulse laser generation method based on double Q-regulating techniques, it is characterised in that comprise the following steps：First by low
Repetition rate adjusts Q to produce giant-pulse, and then adjusts Q to be modulated caused giant-pulse by high repetition frequency, most swashs at last
Light pulse is modulated into multiple subpulses.
A kind of 2. subpulse laser generation method based on double Q-regulating techniques according to claim 1, it is characterised in that including
Following steps：Low-repetition-frequency adjusts Q to use low-repetition-frequency Q-switch（2）, high repetition frequency tune Q is using high repetition frequency tune Q
Switch（5）.
A kind of 3. subpulse laser generation method based on double Q-regulating techniques according to claim 1, it is characterised in that including
Following steps：Also include resonator, resonator includes the first total reflective mirror（1）And outgoing mirror（6）.
A kind of 4. subpulse laser generation method based on double Q-regulating techniques according to claim 1, it is characterised in that including
Following steps：Also include resonator, resonator includes the 3rd total reflective mirror（9）With the second total reflective mirror（11）.
A kind of 5. subpulse laser generation method based on double Q-regulating techniques according to claim 4, it is characterised in that including
Following steps：High repetition frequency Q-switch（5）Tiltedly it is placed on Bragg diffraction angle in resonator.
A kind of 6. subpulse laser generation method based on double Q-regulating techniques according to claim 1, it is characterised in that including
Following steps：Low-repetition-frequency adjusts Q and high repetition frequency to adjust Q by synchronizer trigger（3）To control, realize that low-repetition-frequency drives
Synchronous triggering and delays time to control with high repetition frequency driving.
A kind of 7. subpulse laser generation method based on double Q-regulating techniques according to claim 1, it is characterised in that including
Following steps：It is 100-1kHz that low-repetition-frequency, which adjusts Q repetition rates, and it is 200MHz- that high repetition frequency, which adjusts Q repetition rates,
500MHz。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2022539447A (en) * | 2020-02-13 | 2022-09-09 | エルトラグローバル カンパニー リミテッド | Multiple laser pulse oscillation method and multiple laser pulse oscillation device using multiple Q-switch |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203150895U (en) * | 2013-01-31 | 2013-08-21 | 北京工业大学 | 266nm all-solid state ultraviolet laser capable of being used for material elaborate machining |
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2017
- 2017-09-19 CN CN201710844184.3A patent/CN107565371A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203150895U (en) * | 2013-01-31 | 2013-08-21 | 北京工业大学 | 266nm all-solid state ultraviolet laser capable of being used for material elaborate machining |
Non-Patent Citations (1)
| Title |
|---|
| 雷仕湛: "《光学新世界-非线性光学浅说》", 31 July 1987 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2022539447A (en) * | 2020-02-13 | 2022-09-09 | エルトラグローバル カンパニー リミテッド | Multiple laser pulse oscillation method and multiple laser pulse oscillation device using multiple Q-switch |
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