CN206818313U - A kind of device for measuring Laser Focusing intensity - Google Patents
A kind of device for measuring Laser Focusing intensity Download PDFInfo
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- CN206818313U CN206818313U CN201720212064.7U CN201720212064U CN206818313U CN 206818313 U CN206818313 U CN 206818313U CN 201720212064 U CN201720212064 U CN 201720212064U CN 206818313 U CN206818313 U CN 206818313U
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Abstract
A kind of device for measuring Laser Focusing intensity, one end of housing is provided with suction interface, suction interface is connected with vavuum pump, the left end of housing is provided with testing laser incidence window, testing laser beam enters housing by testing laser incidence window, the lower end of housing is provided with auxiliary laser incidence window, secondary laser beams enter housing by auxiliary laser incidence window, parabolic lens and gas box are provided with housing, aperture is provided with the center of parabolic lens, polar molecule gas is housed inside gas box, the right-hand member of housing is provided with laser exit, laser exit is connected with the extreme ultraviolet CCD, aluminium film is provided between laser exit and extreme ultraviolet CCD.The utility model utilizes laser and the correlation of the phenomenon that gas molecule interacts and Laser Focusing intensity, phenomena such as being radiated by the molecular polarization, molecular ionization and high-order that occur under different Laser Focusing intensity, the focus strength of laser can effectively be judged, compensate for conventional laser intensity detector and can not detect laser intensity exceedingBlank.
Description
Technical field
The utility model belongs to laser technology field, is specifically related to a kind of device for measuring Laser Focusing intensity.
Background technology
Since laser was 20th century, after atomic energy, computer, semiconductor, the another invention of great significance of the mankind, it has been referred to as
" most fast knife ", " most accurate chi ", " most bright light ".The initial Chinese name of laser is called " radium-shine ", " laser ", is its English
Title LASER transliteration, it is taken from English Light Amplification by Stimulated Emission of
The abbreviation of Radiation each word first initial composition.Mean " being expanded by excited radiation light ".The English of laser
Full name expresses the main process of manufacture laser completely, and the principle of laser is early in 1916 by famous American Physical
Scholar Einstein has found." light stimulated radiation " is renamed as " laser " according to the famous scientist's Qian Xuesen suggestion in China within 1964.
Laser application is very extensive, mainly have laser marking, laser welding, laser cutting, fiber optic communication, laser spectrum, laser ranging, swash
Optical radar, laser weapon, laser disc, laser designator, laser rectify regard, laser beautifying, laser scanning, laser mosquito killer etc.
Deng.
Few detection laser intensities are more than 1 × 10 in the market13W/cm2Laser Focusing intensity measurer, this is
Because traditional measuring probe is mostly the solid-states such as semiconductor or crystal probe, this solid-state probe can not bear laser intensity and exceed
1×1013W/cm2Focus strength, it is easy to cause probe burn damage.Therefore, laser intensity can be measured by being badly in need of one kind
More than 1 × 1013W/cm2Laser Focusing intensity measurer.
The content of the invention
The utility model is mainly to solve the technical problem present in above-mentioned prior art, there is provided one kind measurement Laser Focusing
The device of intensity, using laser and the correlation of the phenomenon that gas molecule interacts and Laser Focusing intensity, swashed by difference
Phenomena such as molecular polarization, molecular ionization and the high-order occurred under light focus strength radiates, effectively judge the focus strength of laser.
Above-mentioned technical problem of the present utility model is mainly what is be addressed by following technical proposals：One kind measurement laser
The device of focus strength, including the housing with accommodating chamber, condenser lens and extreme ultraviolet CCD, condenser lens are placed on housing
Left end, extreme ultraviolet CCD are placed on the right-hand member of housing, and one end of the housing is provided with suction interface, and the suction interface is connected with very
Empty pump, the left end of the housing are provided with testing laser incidence window, and testing laser beam enters shell by testing laser incidence window
Body, the lower end of the housing are provided with auxiliary laser incidence window, and secondary laser beams enter housing by auxiliary laser incidence window,
Parabolic lens and gas box are provided with the housing, aperture is provided with the center of the parabolic lens, pole is housed inside the gas box
Property molecular gas, the right-hand member of the housing is provided with laser exit, and the laser exit is connected with the extreme ultraviolet CCD, described to swash
Aluminium film is provided between light exit and extreme ultraviolet CCD.
As preferential, the gas box is connected with air inlet pipe, and the other end of the air inlet pipe is connected with gas bomb, and gas bomb is built-in
Polarized molecular gas, the air inlet pipe are provided with fine tuning valve.
Preferably, the both ends of the gas box are provided with stalloy.
The method of device using measurement Laser Focusing intensity is：
Step (1), gas box are connected by air inlet pipe with gas bomb, and gas bomb is opened micro- built with polar molecule gas
Valve is adjusted, makes to be full of polar molecule gas in gas box；
Step (2), suction interface is connected with vavuum pump, starts vavuum pump, will be evacuated in housing, and maintain in housing
Vacuum；
Step (3), testing laser beam is injected from testing laser incidence window, sequentially passes through condenser lens, testing laser
Aperture at incidence window and parabolic lens center, and in the presence of parabolic lens, by testing laser beam convergence, directive gas box,
At the same time, secondary laser beams pass through auxiliary laser incidence window, are injected on parabolic lens, in the presence of parabolic lens, with treating
Survey laser beam and close beam, directive gas box；
Step (4), close the testing laser beam after beam and puncture the stalloy at gas box both ends, form slight blow hole,
Blow hole leaks out segment polarity molecular gas, but the air-flow size of polar molecule gas is adjusted by fine tuning valve, makes gas
Certain static air pressure is remained in box, secondary laser beams, which are used to polarize polar molecule, to be arranged, testing laser beam and polarization
Polar molecule interaction afterwards produces high-order radiation；
Step (5), high-order radiation are entered remnants testing laser beam and secondary laser beams by aluminium film through laser exit
Row filtering, the high-order radiation after filtering enter extreme ultraviolet CCD, testing laser beam can be analyzed by extreme ultraviolet CCD detection
Focus strength.
The principle of device using measurement Laser Focusing intensity is：Utilize testing laser beam and the polar molecule of polarization arrangement
Gas interaction produces high-order radiation phenomenon, then using the correlation of high-order radiation phenomenon and testing laser focus strength come
The focus strength of laser at judgement.This correlation, which shows as different laser intensities, can produce different high-order radiation intensity, and
Produce and associate with polarization arrangement.The degree of ionization of high-order radiation signal and molecule is closely related simultaneously, and this correlation can pass through
The high field ionization model of molecule is explained.
As shown in Fig. 2 the ionization probability curve for carbon dioxide polar molecule under laser field, three curves difference in figure
For the relation between neutral particle population, single order number of ions, divalent ion number and laser intensity.When laser intensity is less than 8 × 1013W/
cm2When, carbon dioxide molecule can not ionize, and not have the appearance of high-order radiation signal now；When laser intensity is higher than 8 × 1013W/
cm2When, start single order number of ions occur, illustrate now there is the appearance of high-order radiation signal；When laser intensity reaches 3 × 1014W/cm2
When, single order number of ions reaches maximum, illustrates that now high-order radiation signal also reaches extreme value；When laser intensity reaches 1 × 1015W/
cm2When, start divalent ion number occur, illustrate that now high-order radiation signal is respectively derived from single order ion and divalent ion, two
The appearance of rank ion, the polarization degradation in contrast for causing high-order to radiate；When laser intensity reaches 3 × 1015W/cm2When, titanium dioxide
Carbon polar molecule causes high-order radiation signal drastically to decline by excessive circuit, while with the failure of polarization effect.
Therefore, 10 can effectively be judged using this principle, the utility model13~1015W/cm2In the range of Laser Focusing
Strength Changes information, then the intensity calibration by being radiated to high-order and polarization effect calibration, you can the effectively focusing of measurement laser
Intensity.
The utility model has the advantage that：The utility model using the interaction of laser and gas molecule phenomenon with
The correlation of Laser Focusing intensity, radiated by the molecular polarization, molecular ionization and high-order that occur under different Laser Focusing intensity
Phenomena such as, it can effectively judge the focus strength of laser, compensate for conventional laser intensity detector and can not detect laser intensity surpassing
Cross 1 × 1013W/cm2Blank.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the present utility model；
Fig. 2 is the utility model measuring principle schematic diagram；
Fig. 3 is the laser intensity calibration figure of the utility model specific implementation example.
In figure：1st, condenser lens；2nd, housing；3rd, testing laser incidence window；4th, auxiliary laser incidence window；5th, vacuum
Pump；6th, suction interface；7th, gas bomb；8th, fine tuning valve；9th, air inlet pipe；10th, gas box；11st, extreme ultraviolet CCD；12nd, aluminium film；13、
Parabolic lens；14th, testing laser beam；15th, secondary laser beams；16th, high-order radiates；17th, computer；18th, control line；19th, laser exit.
Embodiment
Below by embodiment, and with reference to accompanying drawing, the technical solution of the utility model is described in further detail.
Embodiment：A kind of device for measuring Laser Focusing intensity, as shown in figure 1, including the housing with accommodating chamber, focusing on
Lens and extreme ultraviolet CCD, condenser lens are placed on the left end of housing, and extreme ultraviolet CCD is placed on the right-hand member of housing, the housing
One end is provided with suction interface, and the suction interface is connected with vavuum pump, and the left end of the housing is provided with testing laser incidence window, treated
Survey laser beam and housing is entered by testing laser incidence window, the lower end of the housing is provided with auxiliary laser incidence window, auxiliary
Laser beam enters housing by auxiliary laser incidence window, and parabolic lens and gas box are provided with the housing, the parabolic lens
Aperture is provided with center, polar molecule gas is housed inside the gas box, the right-hand member of the housing is provided with laser exit, described
Laser exit is connected with the extreme ultraviolet CCD, and aluminium film is provided between laser exit and the extreme ultraviolet CCD, and the gas box connects
There is an air inlet pipe, the other end of the air inlet pipe is connected with gas bomb, and gas bomb is set in the air inlet pipe built with polar molecule gas
There is fine tuning valve, the both ends of the gas box are provided with stalloy.
The method of device using measurement Laser Focusing intensity is：Step (1), gas box pass through air inlet pipe and gas bomb phase
Even, gas bomb opens fine tuning valve, makes to be full of polar molecule gas in gas box built with polar molecule gas；Step (2),
Suction interface is connected with vavuum pump, starts vavuum pump, will be evacuated in housing, and maintain the vacuum in housing；Step
(3), testing laser beam is injected from testing laser incidence window, sequentially passes through condenser lens, testing laser incidence window and throwing
Aperture at object lens center, and in the presence of parabolic lens, testing laser beam convergence, at the same time, aids in directive gas box
Laser beam passes through auxiliary laser incidence window, is injected on parabolic lens, and in the presence of parabolic lens, beam is closed with testing laser beam,
Directive gas box；Step (4), close the testing laser beam after beam and puncture the stalloy at gas box both ends, form slight breakdown
Hole, blow hole leak out segment polarity molecular gas, but the air-flow size of polar molecule gas is adjusted by fine tuning valve, make gas
Certain static air pressure is remained in body box, secondary laser beams, which are used to polarize polar molecule, to be arranged, testing laser beam and pole
Polar molecule interaction after change produces high-order radiation；Step (5), high-order are radiated through laser exit, will be residual by aluminium film
Remaining testing laser beam and secondary laser beams are filtered, and the high-order radiation after filtering enters extreme ultraviolet CCD, passes through extreme ultraviolet
CCD detection can analyze the focus strength of testing laser beam.
Wherein, housing uses stainless steel material, is assembled and sealed by sealing ring；Vavuum pump maintains the vacuum in housing
1 × 10-3More than Pa；Condenser lens uses quartz lens, focal length 500mm；Testing laser incidence window and auxiliary laser
Incidence window uses ultraviolet quartz window sheet, and window thickness is in 3mm or so；Carbon dioxide is contained in gas bomb；Air inlet pipe
Using stainless steel；Gas box is assembled using stalloy sealing, and the thickness of stalloy is 0.2mm；Extreme ultraviolet CCD product
Board is Princeton Instruments, model SX400, is connected by control line with computer；Aluminium film use thickness for
500nm aluminium film, supported by copper stent for it；The a diameter of 2mm of center drilling of parabolic lens, the focal length of parabolic lens is 200mm；Treat
Survey the 800nm Ti∶Sapphire laser fs-laser systems that laser beam uses the production of Coherent companies, output pulse width 45fs, single pulse energy
Measuring can be by energy controller continuous variable, for changing in real time at focal spot for 8mJ, output frequency 1kHz, its output energy
Laser intensity；The laser that auxiliary laser is exported using common high power picosecond laser, its wavelength is 532nm, for pole
The polarization of property molecule, its focus strength in gas box is about 1013W/cm2。
After the utility model, measure and depict the relation between high-order radiation signal and Laser Focusing intensity, such as
Shown in Fig. 3, high-order radiation intensity changes with the change that laser intensity changes, dotted line be parallel polarization (i.e. auxiliary laser and
The polarization direction of testing laser is consistent) when high-order radiation signal, high-order radiation signal when solid line is no auxiliary laser, section line
High-order radiation signal when being vertical polarization (i.e. the polarization direction of auxiliary laser and testing laser is mutually perpendicular to).
From figure 3, it can be seen that work as laser intensity up to 3 × 1014W/cm2When, high-order radiation intensity reaches maximum；When laser is strong
Degree reaches 1 × 1015W/cm2When, due to the appearance of divalent ion number, cause radiation intensity and polarization effect change that high-order radiates
Difference, size are about the half of extreme value；When laser intensity reaches 3 × 1015W/cm2When, because carbon dioxide polar molecule is excessive
Ionization, cause high-order radiation intensity to decline simultaneously with the failure of polarization effect (i.e. together with dotted line, solid line and section line overlap).
Fig. 3 experimental results and Fig. 2 principle result of calculation are basically identical, therefore, utilize principle of the present utility model and method
10 can effectively be judged13~1015W/cm2In the range of Laser Focusing Strength Changes.
Finally it is pointed out that above example is only the more representational example of the utility model.Obviously, this practicality is new
Type is not limited to above-described embodiment, can also there is many deformations.Every foundation the technical essence of the utility model is to above example
Any simple modification, equivalent change and modification made, it is considered as belonging to the scope of protection of the utility model.
Claims (3)
1. a kind of device for measuring Laser Focusing intensity, including the housing with accommodating chamber, condenser lens and extreme ultraviolet CCD, gather
Focus lens are placed on the left end of housing, and extreme ultraviolet CCD is placed on the right-hand member of housing, it is characterised in that one end of the housing is provided with
Suction interface, the suction interface are connected with vavuum pump, and the left end of the housing is provided with testing laser incidence window, testing laser beam
Housing is entered by testing laser incidence window, the lower end of the housing is provided with auxiliary laser incidence window, and secondary laser beams are led to
Cross auxiliary laser incidence window and enter housing, be provided with parabolic lens and gas box in the housing, set at the center of the parabolic lens
There is aperture, polar molecule gas is housed inside the gas box, the right-hand member of the housing is provided with laser exit, the laser exit
It is connected with the extreme ultraviolet CCD, aluminium film is provided between laser exit and the extreme ultraviolet CCD.
2. according to claim 1 it is a kind of measure Laser Focusing intensity device, it is characterised in that the gas box be connected with into
Tracheae, the other end of the air inlet pipe are connected with gas bomb, and gas bomb is provided with micro- built with polar molecule gas, the air inlet pipe
Adjust valve.
A kind of 3. device for measuring Laser Focusing intensity according to claim 1, it is characterised in that the both ends of the gas box
Provided with stalloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720212064.7U CN206818313U (en) | 2017-03-06 | 2017-03-06 | A kind of device for measuring Laser Focusing intensity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720212064.7U CN206818313U (en) | 2017-03-06 | 2017-03-06 | A kind of device for measuring Laser Focusing intensity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206818313U true CN206818313U (en) | 2017-12-29 |
Family
ID=60750623
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720212064.7U Expired - Fee Related CN206818313U (en) | 2017-03-06 | 2017-03-06 | A kind of device for measuring Laser Focusing intensity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206818313U (en) |
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2017
- 2017-03-06 CN CN201720212064.7U patent/CN206818313U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171229 Termination date: 20190306 |
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| CF01 | Termination of patent right due to non-payment of annual fee |