CN212844017U - Novel laser pulse autocorrelator - Google Patents
Novel laser pulse autocorrelator Download PDFInfo
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- CN212844017U CN212844017U CN202020884093.XU CN202020884093U CN212844017U CN 212844017 U CN212844017 U CN 212844017U CN 202020884093 U CN202020884093 U CN 202020884093U CN 212844017 U CN212844017 U CN 212844017U
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Abstract
The utility model discloses a novel laser pulse autocorrelator, including treater, time delay part and measurement element, the time delay part includes first speculum, second speculum, third speculum, fourth speculum, first adjustable platform and regulator, first speculum and second speculum are arranged in on the first adjustable platform, the regulator is used for controlling first adjustable platform to the position of controlling first speculum and second speculum, measurement element includes measuring component, the adjustable platform of second and controller, the measuring component is connected with the controller and is arranged in on the adjustable platform of second in the back, the treater is connected with regulator, controller and measuring component respectively. The optical path of the preset first light beam can be conveniently and accurately adjusted by adopting the time delay component, so that the phase delay of the preset first light beam and the preset second light beam is realized, and the phase signal detection of the light beam pulse in any polarization state can be realized on the basis of the measuring component adjusted by the controller and the second adjustable platform.
Description
Technical Field
The utility model relates to a laser application technical field especially relates to a novel laser pulse autocorrelator.
Background
With the development of industry and science and technology, laser is widely used in the fields of medical treatment, military, communication, industry and the like due to the characteristics of good monochromaticity, high brightness, good directivity and the like. The laser spot quality is a main reason for influencing laser application, and the laser pulse width is a key factor influencing the laser spot quality, especially ultra-short laser technologies such as femtosecond/attosecond. Therefore, the requirement of the industry on the quantitative control of the ultrashort laser is continuously increased, and especially the accurate measurement of the pulse width of the ultrashort laser is very important.
At present, the ultrashort laser pulse autocorrelator is an effective tool for measuring the width of ultrashort laser pulses such as femtosecond/attosecond, and the main principle is to divide a laser beam into two beams of laser and make the two beams of laser generate time delay correlation, and then recover the time width of the laser pulse by the time delay correlation between the lasers and convert the time width into space length for measurement.
At present, the schemes for measuring femtosecond and other ultrashort laser pulses in the industry are mainly divided into two types: (1) in the optical fiber type scheme, optical fiber jumpers with different lengths are adopted to realize dispersion adjustment of laser pulses; (2) the space light type scheme is that the femtosecond laser adopts space light output, adopts a grating pair as a dispersion regulator, and realizes the control of femtosecond laser pulse by changing the grating pair interval. However, the above-mentioned solutions not only have high requirements for optical path adjustment, but also require precise adjustment of the grating pair spacing, and require a standard autocorrelator to calibrate the pulse width when in use, which is cumbersome to operate; in addition, the grating use causes larger insertion loss to cause the quality of the laser spot to be reduced; or because it is difficult to make the transmitted light pulse keep accurate horizontal or vertical linear polarization in the optical fiber, the femtosecond laser is easy to generate double pulse or complex chirp characteristic after passing through the optical fiber jumper, which causes the disadvantage of unstable autocorrelation test result; the accurate measurement of the laser pulse width in any polarization state cannot be realized conveniently.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model aims at providing a realize the accurate novel laser pulse autocorrelator who measures to arbitrary polarization state laser pulse width.
The utility model adopts the technical proposal that:
a novel laser pulse autocorrelator comprises a processor, a time delay component and a measuring component, wherein the time delay component comprises a first reflecting mirror, a second reflecting mirror, a third reflecting mirror, a fourth reflecting mirror, a first adjustable platform and an adjuster, the first reflecting mirror and the second reflecting mirror are arranged on the first adjustable platform, the adjuster is used for controlling the first adjustable platform so as to control the positions of the first reflecting mirror and the second reflecting mirror, the measuring component comprises a measuring component, a second adjustable platform and a controller, the measuring component is connected with the controller and then arranged on the second adjustable platform, the processor is respectively connected with the adjuster, the controller and the measuring component, each reflecting mirror is used for changing the optical path of a preset first light beam so as to generate phase delay with the preset second light beam, the measuring component is used for detecting phase signals of the preset first light beam and the preset second light beam which are transmitted along a first direction, to make a pulse width measurement.
Optionally, the second adjustable platform is a circular arc platform or a sector platform.
Optionally, the measuring component includes a diaphragm, a filter and a photodetector, the diaphragm, the filter and the photodetector are sequentially disposed, and the photodetector is connected to the controller.
Optionally, the filter is a variable filter.
Optionally, the optical fiber delay device further comprises a beam splitting component, wherein the beam splitting component comprises a first beam splitter, a second beam splitter, a fifth reflector and a sixth reflector, the first beam splitter and the fifth reflector are arranged in the light inlet side of the delay component, and the second beam splitter and the sixth reflector are arranged in the light outlet side of the delay component.
Optionally, the first beam splitter is configured to split the incident light into a first light beam and a second light beam, the fifth mirror is configured to propagate the first light beam to the time delay component, the sixth mirror is configured to propagate the second light beam to the second beam splitter, and the second beam splitter is configured to propagate the first light beam and the second light beam in the first direction and the second direction, respectively.
Optionally, the optical path calibration component is further included, and is configured to calibrate the first light beam and the second light beam both propagating along the second direction.
Optionally, a lens is further included, the lens being disposed between the beam splitting component and the measurement component, the lens being configured to focus the first light beam and the second light beam.
Optionally, the measuring device further comprises a frequency doubling component, the frequency doubling component is disposed between the lens and the measuring component, the frequency doubling component comprises a nonlinear frequency doubling crystal and a rotating support, and the nonlinear frequency doubling crystal is disposed on the rotating support.
Optionally, the nonlinear frequency doubling crystal comprises at least one of a lithium triborate crystal, a potassium titanyl phosphate crystal, a barium metaphosphate crystal, and a bismuth triborate crystal.
The utility model has the advantages that: the optical path of the preset first light beam can be conveniently and accurately adjusted by adopting the time delay component, so that the phase delay of the preset first light beam and the preset second light beam is realized, and the phase signal detection of the light beam pulse in any polarization state can be realized on the basis of the measuring component adjusted by the controller and the second adjustable platform.
Drawings
Fig. 1 is a block diagram of a novel laser pulse autocorrelator of the present invention;
fig. 2 is a schematic diagram of the optical path of the novel laser pulse autocorrelator provided by the present invention.
Reference numerals: 1. the device comprises a first beam splitter, a second beam splitter, a third beam splitter, a fourth beam splitter, a fifth beam splitter, a.
Detailed Description
As shown in fig. 1, a novel laser pulse autocorrelator comprises a processor, a time delay component and a measuring component, wherein the time delay component comprises a first reflecting mirror, a second reflecting mirror, a third reflecting mirror, a fourth reflecting mirror, a first adjustable platform and an adjuster, the first reflecting mirror and the second reflecting mirror are arranged on the first adjustable platform, the adjuster is used for controlling the first adjustable platform so as to control the positions of the first reflecting mirror and the second reflecting mirror, the measuring component comprises a measuring component, a second adjustable platform and a controller, the measuring component is connected with the controller and then arranged on the second adjustable platform, the processor is respectively connected with the adjuster, the controller and the measuring component, each reflecting mirror is used for changing the optical path length of a preset first light beam so as to generate phase delay with a preset second light beam, the measuring component is used for detecting phase signals of the preset first light beam and the preset second light beam which are both transmitted along a first direction, to make a pulse width measurement.
In this embodiment, the preset first light beam and the preset second light beam are divided into two laser beams with the same energy by the same light beam, and the first adjustable platform is a platform whose displacement can be precisely adjusted; specifically, after entering the delay component, the preset first light beam changes the optical path of the preset first light beam through the reflection action of the first reflector, the second reflector, the third reflector and the fourth reflector, so that the preset first light beam and the preset second light beam generate phase delay, wherein the first reflector and the second reflector are arranged on a first adjustable platform, the position of which can be accurately adjusted by an adjuster, so that the position of the first adjustable platform can be adjusted to realize accurate adjustment of the optical path of the preset first light beam, the preset first light beam and the preset second light beam are transmitted to a measuring component along a first direction and are detected and received by a measuring component, wherein the measuring component is arranged on a second adjustable platform which is accurately adjusted by a controller, so that the measuring component can accurately receive the light beam in any polarization state, and the measuring component feeds back phase signals of the detected preset first light beam and the preset second light beam to a processor, and the processor outputs the pulse width of the laser beam to be measured according to signals fed back by the regulator, the controller and the measuring component.
Optionally, the second adjustable platform is a circular arc platform or a sector platform.
In this embodiment, the second adjustable platform is designed as a circular arc platform or a fan-shaped platform, so that the measuring component arranged on the second adjustable platform can detect the frequency-doubled light emitted in different directions.
Optionally, the measuring component includes a diaphragm, a filter and a photodetector, the diaphragm, the filter and the photodetector are sequentially disposed, and the photodetector is connected to the controller.
In this embodiment, the diaphragm is configured to shield an influence of stray light caused by refraction, reflection, scattering, and the like of the preset first light beam and the preset second light beam on the frequency doubled light, the filter is configured to attenuate the frequency doubled light emitted from the diaphragm, and the photodetector is configured to detect an autocorrelation signal of a light beam phase signal incident therein.
Optionally, the filter is a variable filter.
The variable filter attenuates the non-passing multiplied light by changing its attenuation wavelength so that the passing multiplied light passes through and is detected by the photodetector.
Optionally, the optical fiber delay device further comprises a beam splitting component, wherein the beam splitting component comprises a first beam splitter, a second beam splitter, a fifth reflector and a sixth reflector, the first beam splitter and the fifth reflector are arranged in the light inlet side of the delay component, and the second beam splitter and the sixth reflector are arranged in the light outlet side of the delay component.
Optionally, the first beam splitter is configured to split the incident light into a first light beam and a second light beam, the fifth mirror is configured to propagate the first light beam to the time delay component, the sixth mirror is configured to propagate the second light beam to the second beam splitter, and the second beam splitter is configured to propagate the first light beam and the second light beam in the first direction and the second direction, respectively.
Optionally, the optical path calibration component is further included, and is configured to calibrate the first light beam and the second light beam both propagating along the second direction.
The subsequent laser pulse width is accurately measured by synchronously calibrating the first light beam and the second light beam which are separated by the second beam splitter in the beam splitting component and all along the second direction through the light path calibration device.
Optionally, a lens is further included, the lens being disposed between the beam splitting component and the measurement component, the lens being configured to focus the first light beam and the second light beam.
Optionally, the measuring device further comprises a frequency doubling component, the frequency doubling component is disposed between the lens and the measuring component, the frequency doubling component comprises a nonlinear frequency doubling crystal and a rotating support, and the nonlinear frequency doubling crystal is disposed on the rotating support.
In this embodiment, the non-linear frequency doubling crystal is placed on the rotating support in the rotating frequency doubling component, and the measurement of the autocorrelation signals such as the phase delay of the incident pulse in any polarization state can be realized according to the angle or position of the rotating non-linear frequency doubling crystal (crystal axis) relative to the incident beam.
Optionally, the nonlinear frequency doubling crystal comprises at least one of a lithium triborate crystal, a potassium titanyl phosphate crystal, a barium metaphosphate crystal, and a bismuth triborate crystal.
In this embodiment, the barium metaphosphate crystal with good selectivity is used as a nonlinear frequency doubling crystal, and the barium metaphosphate crystal has the advantages of wide light transmission range, low absorption coefficient, high extinction ratio, large matching angle, high light damage resistance threshold and the like.
The utility model discloses a concrete embodiment
As shown in fig. 2, the present invention provides a novel laser pulse autocorrelator, which comprises a processor 12, a beam splitting component, a delay component, a lens 8, a frequency doubling component, a measuring component 10 and a light path calibrating component 6; the time delay component comprises a first reflecting mirror 52, a second reflecting mirror 53, a third reflecting mirror 54, a fourth reflecting mirror 53 and an adjuster 4, specifically, the first reflecting mirror 52, the second reflecting mirror 53, the third reflecting mirror 54 and the fourth reflecting mirror 53 are placed in a quadrilateral shape along the clockwise direction, the first reflecting mirror 52 and the second reflecting mirror 53 are placed on a first adjustable platform, and the first adjustable platform is connected with the adjuster 4, so that the optical path of the reflected light 15 can be accurately adjusted by controlling the position of the first adjustable platform; the beam splitting component comprises a first beam splitter 1, a first reflector 2, a second reflector 3 and a second beam splitter 7, the first beam splitter 1 and the second reflector 3 are arranged on the light incident side of the delay component, and the first reflector 2 and the second beam splitter 7 are arranged on the light emergent side of the delay component; the frequency doubling component comprises a barium metaphosphate crystal 9 and a rotary bracket 13, and the barium metaphosphate crystal 9 is arranged on the rotary bracket 13; the measuring component 10 comprises a diaphragm 101, a variable filter 102, a photoelectric detector 103, a second adjustable platform and a controller 11, wherein the diaphragm 101, the variable filter 102 and the photoelectric detector 103 form a measuring assembly, the photoelectric detector 103 in the measuring assembly is connected with the controller 11 and then is arranged on the second adjustable platform, and the second adjustable platform is an arc platform; the processor 12 is connected to the regulator 4, the photodetector 103, and the controller 11, respectively.
Specifically, the laser beam to be measured is divided into reflected light 15 (first light beam) and transmitted light 16 (second light beam) by the first beam splitter 1; the reflected light 15 is reflected into the time delay component by the second reflector, and the optical path of the reflected light 15 and the transmitted light 16 are delayed and changed in the time delay component through the fourth reflector 51, the first reflector 52, the second reflector 53 and the third reflector 54, so that phase delay is generated between the reflected light 15 and the transmitted light 16, wherein the optical path of the reflected light 15 can be accurately adjusted by controlling the position of the first adjustable platform by the controller 4; then the reflected light 15 and the transmitted light 16 are divided into the reflected light 15 and the transmitted light 16 which are propagated along a first direction 18 (horizontal direction) and the reflected light 15 and the transmitted light 16 which are propagated along a second direction 17 (vertical direction) on the second beam splitter 7, wherein the reflected light 15 and the transmitted light 16 which are propagated along the vertical direction are received by the light path calibration component 6 and are used for calibrating the system light path, the reflected light 15 and the transmitted light 16 which are propagated along the horizontal direction are transmitted to the lens 8, and are focused by the lens 8, then the reflected light 15 and the transmitted light 16 which are propagated along the horizontal direction are incident to the frequency doubling component at a small angle, and the frequency doubling effect is generated in the barium metaphosphate crystal 9 of the frequency doubling component so as to generate the dispersion phenomenon; the frequency doubling light with different frequencies generated by the frequency doubling component is filtered by the diaphragm 101 and attenuated by the variable filter 102, and then is detected by the photoelectric detector, wherein the regulator 4, the photoelectric detector 103 and the controller 11 of the time delay component are all connected with the processor 12, and the processor 12 outputs the pulse width of the detected laser beam according to signals fed back by the regulator 4, the photoelectric detector 103 and the controller 11.
Situation one
The central wavelength of an incident laser pulse is 1053nm, the pulse width is about 1fs, the energy is about 1mJ, the caliber of a light beam is about 1mm multiplied by 1mm, the incident light pulse is in the vertical linear polarization direction, the rotating bracket 13 is shifted to enable the crystal axis of the barium metaphosphate crystal 9 to be in the vertical direction, a light beam (reflected light 15) reflected by the second reflecting mirror 3 and a light beam (transmitted light 16) reflected by the first reflecting mirror 2 are incident on the barium metaphosphate crystal 9 along the horizontal direction (namely the first direction 18) at an included angle of about 30 degrees, the generated frequency doubling light beam is output along the direction range vertical to the surface of the barium metaphosphate crystal 9, in the process, the circular arc platform (the second adjustable platform) is firstly moved to correspond to the direction, secondly, the filtering frequency of the delay element adjuster 4 and the variable filter 102 is adjusted to make the strongest bright spot be at the central position of the frequency doubling light beam, and the frequency doubling light recorded by the photoelectric detector 103 is an autocorrelation signal.
Situation two
The central wavelength of an incident laser pulse is 1053nm, the pulse width is about 1fs, the energy is about 1mJ, the caliber of a light beam is about 1mm multiplied by 1mm, the incident light pulse is in the horizontal line polarization direction, the rotating bracket 13 is shifted to enable the crystal axis of the barium metaphosphate crystal 9 to be in the horizontal direction, a light beam (reflected light 15) reflected by the second reflecting mirror 3 and a light beam (transmitted light 16) reflected by the first reflecting mirror 2 are incident on the barium metaphosphate crystal 9 along the horizontal direction (namely the first direction 18) at an included angle of about 30 degrees, the generated frequency doubling light beam is output along the direction range vertical to the surface of the barium metaphosphate crystal 9, in the process, the circular arc platform (the second adjustable platform) is firstly moved to correspond to the direction, secondly, the filtering frequency of the delay element adjuster 4 and the variable filter 102 is adjusted to make the strongest bright spot be at the central position of the frequency doubling light beam, and the frequency doubling light recorded by the photoelectric detector 103 is an autocorrelation signal.
Situation three
The central wavelength of an incident laser pulse is 1053nm, the pulse width is about 1fs, the energy is about 1mJ, the aperture of a light beam is about 1mm multiplied by 1mm, the incident laser pulse is in a linear polarization direction in any direction, the rotating support 13 is shifted to enable the crystal axis of the barium metaphosphate crystal 9 to enable the frequency doubling light beam output by the barium metaphosphate crystal 9 to be strongest, the crystal axis direction of the current barium metaphosphate crystal 9 is kept, in the process, firstly, the circular arc platform (second adjustable platform) is moved to correspond to the direction, secondly, the filtering frequency of the delay component adjuster 4 and the variable filter 102 is adjusted to enable the strongest bright spot to be in the central position of the frequency doubling light beam, and at the moment, the frequency doubling light recorded by the photoelectric detector 103 is an autocorrelation signal.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (10)
1. A novel laser pulse autocorrelator is characterized by comprising a processor, a time delay component and a measuring component, wherein the time delay component comprises a first reflecting mirror, a second reflecting mirror, a third reflecting mirror, a fourth reflecting mirror, a first adjustable platform and an adjuster, the first reflecting mirror and the second reflecting mirror are arranged on the first adjustable platform, the adjuster is used for controlling the first adjustable platform so as to control the positions of the first reflecting mirror and the second reflecting mirror, the measuring component comprises a measuring component, a second adjustable platform and a controller, the measuring component is connected with the controller and then arranged on the second adjustable platform, the processor is respectively connected with the adjuster, the controller and the measuring component, each reflecting mirror is used for changing the optical path length of a preset first light beam so as to generate phase delay with a preset second light beam, the measuring component is used for detecting phase signals of the preset first light beam and the preset second light beam which are both transmitted along a first direction, to make a pulse width measurement.
2. The novel laser pulse autocorrelator of claim 1, wherein the second adjustable stage is a circular arc stage or a sector stage.
3. The novel laser pulse autocorrelator according to claim 1, wherein the measuring component comprises an aperture, a filter and a photodetector, the aperture, the filter and the photodetector are sequentially disposed, and the photodetector is connected to the controller.
4. The novel laser pulse autocorrelator of claim 3, wherein the filter is a variable filter.
5. The novel laser pulse autocorrelator according to claim 1, further comprising a beam splitting component, wherein the beam splitting component comprises a first beam splitter, a second beam splitter, a fifth mirror and a sixth mirror, the first beam splitter and the fifth mirror are disposed on the light incident side of the delay component, and the second beam splitter and the sixth mirror are disposed on the light emergent side of the delay component.
6. The novel laser pulse autocorrelator of claim 5, wherein the first beam splitter is configured to split the incident light into a first beam and a second beam, the fifth mirror is configured to propagate the first beam to the delay element, and the sixth mirror is configured to propagate the second beam to the second beam splitter, and the second beam splitter is configured to propagate the first beam and the second beam in the first direction and the second direction, respectively.
7. The novel laser pulse autocorrelator of claim 6, further comprising an optical path calibration component for calibrating the first beam and the second beam both propagating in the second direction.
8. The novel laser pulse autocorrelator of claim 1, further comprising a lens disposed between the beam splitting component and the measurement component, the lens configured to focus the first beam and the second beam.
9. The novel laser pulse autocorrelator according to claim 8, further comprising a frequency doubling component, wherein the frequency doubling component is disposed between the lens and the measuring component, the frequency doubling component comprises a nonlinear frequency doubling crystal and a rotating support, and the nonlinear frequency doubling crystal is disposed on the rotating support.
10. The novel laser pulse autocorrelator according to claim 9, wherein the nonlinear frequency doubling crystal comprises any one of a lithium triborate crystal, a potassium titanyl phosphate crystal, a barium metaphosphate crystal and a bismuth triborate crystal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020884093.XU CN212844017U (en) | 2020-05-22 | 2020-05-22 | Novel laser pulse autocorrelator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020884093.XU CN212844017U (en) | 2020-05-22 | 2020-05-22 | Novel laser pulse autocorrelator |
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| CN212844017U true CN212844017U (en) | 2021-03-30 |
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