CN101038412A - Ultra-short pulsed laser wave filtering device - Google Patents
Ultra-short pulsed laser wave filtering device Download PDFInfo
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- CN101038412A CN101038412A CN 200710038661 CN200710038661A CN101038412A CN 101038412 A CN101038412 A CN 101038412A CN 200710038661 CN200710038661 CN 200710038661 CN 200710038661 A CN200710038661 A CN 200710038661A CN 101038412 A CN101038412 A CN 101038412A
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Abstract
An ultra-short pulse laser filtering device, consists of the first 1/4 wave plate, the first positive lens, apertured diaphragm, non-linear orthochromatic transparent solid materials, the second positive lens, the second 1/4 wave plate and polarization analyzer arranged on the same optical axis, the interval between the first positive lens and the second positive lens is the sum of both focuses and commonly shared the focus, the apertured diaphragm locates at the focus of the first positive lens, the angle between the fast axis of the first 1/4 wave plate and the polarization direction of incidence linear polarization ultra-short-pulse is 22.5 degrees, the non-linear orthochromatic transparent solid material is installed on the sliding block, the first 1/4 wave plate and the second 1/4 wave plate are the zero order 1/4 wave plate, and its fast axes are mutually orthochromatic, the optical axis of polarization analyzer is perpendicular to the polarization direction of incidence linear polarization ultra-short-pulse. The invention may eliminate the space non-uniform of laser, improve the time contrast of ultra-short pulse, simple structure, easy to adjust its optical path.
Description
Technical field
The present invention relates to ultrashort laser pulse, particularly a kind of ultra-short pulsed laser wave filtering device, it can realize the spatial filtering and the time filtering of femtosecond high power ultra-short pulse laser, improves pulse quality, thereby obtains the laser pulse of high time-space resolution.
Background technology
The world today, the every field from productive life, scientific research to national security, ultra-short pulse laser has all obtained using widely, and the ultra-short pulse laser amplifying technique has become one of research focus of laser technology at present.Conspicuous achievement in the ultra-short pulse laser technology is developing rapidly of chirped pulse amplification (being designated hereinafter simply as CPA).The ultrashort superpower pulse laser that the CPA technology produces has been opened up multiple high field scientific domain, what is particularly worth mentioning is that inertial confinement fusion (ICF) the fast ignition technology that becomes the research focus in recent years.In these are used, the ultrashort pulse quality as light source often there is very high requirement, and Laser Time contrast＜10 that the CPA technology produces
3, and exist because the spatial high-frequency that diffraction and nonlinear effect produce is modulated.Therefore, obtain high-quality ultrashort pulse light laser just needs paired pulses to purify.
Formerly technology 1, people such as D.Homoelle have proposed to utilize the hollow optic fibre of filling inert gas to improve method (" Pulse contrast enhancement ofhigh-energy pulses by useof a gas-filled hollow waveguide " Optics Letters of high strength ultrashort pulse contrast, Vol.27, NO.18,1646-1648,2002); Formerly technology 2, people such as Chen Xiaowei have proposed to utilize non-linear positive dispersion solid transparent material to arrive raising pulse contrast (" ultrashort pulse time and space purifying device ", patent of invention, 2005.11.23, CN 1700536A), the purpose of compression pulse and simultaneously.
Fig. 1 is that people such as D.Homoelle utilizes the hollow waveguide of filling inert gas to improve the index path of high strength ultrashort pulse contrast.The ultrashort pulse of horizontal polarization is incided on first quarter wave plate 1, the polarization direction of the quick shaft direction of first quarter wave plate 1 and incident ultrashort pulse becomes 22.5 °, behind first quarter wave plate 1, the polarization state of ultrashort pulse becomes elliptic polarization, is focused into by first positive lens 2 then to be mapped in the waveguide 3 that is full of inert gas.The ultrashort pulse of outgoing is incided on second quarter wave plate 5 of quick shaft direction perpendicular to first quarter wave plate 1 by collimation lens 4 again from waveguide 3, and by analyzer 6 outputs, the quick shaft direction of analyzer 6 is vertical with the polarization direction of incident ultrashort pulse at last.The ultrashort pulse of elliptic polarization can produce the non linear elliptic rotation effect when propagating in inert gas, near the high strength of peak value of pulse is partly deflected, the polarization state of low intensive pulse base and satellite pulse is then constant substantially, when pulse during through second quarter wave plate 5 and analyzer 6, have only the main pulse vertical with the incident pulse polarization direction partly to export, the satellite pulse consistent with the incident pulse polarization direction then filtered.
In this device, when inert gas was passed through in pulse, because the influence of nonlinear effect, the width of ultrashort pulse obtained very big broadening, even division, thereby needed extra dispersion compensation device, and this has just increased the complexity and the cost of device.In order to keep beam mode and avoid gas ionization, the incident pulse energy can only be limited in the millijoule magnitude in addition.
Fig. 2 is the ultrashort pulse time and the space purifying device synoptic diagram of people such as Chen Xiaowei invention.
This device will be formerly inert gas filled hollow waveguide in the technology 1 changed non-linear positive dispersion transparent solid material 9 into, so both can reach the purpose of time purification, compression pulse, saved extra dispersion compensation device again.But it has adopted two catoptrons to increase the reflection loss of system.
Summary of the invention
Purpose of the present invention is exactly the deficiency that will remedy above-mentioned technology formerly, and a kind of ultrashort pulse filter is provided, and this device should have the effect that reaches time purification, compressed pulse widths and spatial filtering simultaneously, and has advantage simple in structure, easy to adjust.
Technical solution of the present invention is as follows:
A kind of ultra-short pulsed laser wave filtering device, be characterized in by first quarter wave plate that sets gradually with optical axis, first positive lens, aperture, non-linear positive dispersion transparent solid material, second positive lens, second quarter wave plate and analyzer constitute, the spacing of described first positive lens and second positive lens is two focal length sums and confocal point, described aperture is positioned at the focus of first positive lens, the quick shaft direction of first quarter wave plate becomes 22.5 ° with the polarization direction of the linear polarization ultrashort pulse of incident, described non-linear positive dispersion transparent solid material is installed on the slide block, this slide block is fixed on the optics slide rail, first quarter wave plate and second quarter wave plate are the zero level quarter wave plate, and its quick shaft direction is mutually orthogonal, and the optical axis direction of described analyzer is vertical mutually with the polarization direction of the linear polarization ultra-short pulse laser of incident.
Described non-linear positive dispersion transparent solid material is positioned at after the geometrical focus of first positive lens.
By described non-linear positive dispersion transparent solid material is BK7 glass.
The principle of work of ultra-short pulsed laser wave filtering device of the present invention is as follows:
The ultra-short pulse laser of one elliptic polarization can produce the non linear elliptic rotation effect when propagating in non-linear positive dispersion transparent solid material, change the polarization state of incident laser, the intensity exponent function relation of this nonlinear effect and incident laser.When the quick shaft direction of the first zero level quarter wave plate becomes 22.5 ° with the polarization direction of the linearly polarized laser of incident, the elliptic polarization polarisation of light rotation efficiency the best that obtains.This ELLIPTIC REVOLUTION effect partly deflects near the high strength of peak value of pulse, and the polarization state of low intensive pulse base and satellite pulse is then constant substantially.Pulse makes the part that polarization state does not have to change in the pulse return to original polarization state through second quarter wave plate more then, the high strength part that produces the non linear elliptic rotation effect then deflects with former polarization state, with analyzer the high strength part of pulse is separated with remainder at last, thereby improve the time contrast of ultrashort pulse.And also can produce the pulse width compression during by non-linear positive dispersion transparent solid material owing to self-focusing effect and the action of plasma that produces thereupon in pulse.In addition, the aperture that is positioned at the first positive lens geometrical focus place can play the effect of spatial filtering, thereby improves the spatial modulation of high power ultra-short pulse laser, and time filtering and spatial filtering are finished synchronously, improves the ultrashort pulse quality greatly.
Technique effect of the present invention is as follows:
1, the present invention utilizes non linear elliptic rotation effect and the space-time self-focusing effect of high power ultrashort pulse in non-linear positive dispersion transparent solid material transmission course, and the spatial filtering effect of aperture reaches the effect that strengthens time contrast, compression pulse and improve spatial modulation simultaneously.Whole device is simple, it is easy, easy to adjust to build, and can reach better spatial modulation effect than technology formerly.
2, native system need not other dispersion compensation and reflection unit, can significantly reduce the energy loss of system.
Description of drawings
Fig. 1 is the light path synoptic diagram that the hollow waveguide of the utilization filling inert gas of technology 1 formerly improves high strength ultrashort pulse contrast.
Fig. 2 is the ultrashort pulse time and the space purifying device synoptic diagram of technology 2 formerly.
Fig. 3 is a ultrashort pulse filter synoptic diagram of the present invention.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
See also Fig. 3 earlier, Fig. 3 is a ultrashort pulse filter synoptic diagram of the present invention.As seen from the figure, the formation of ultrashort pulse filter of the present invention comprises first quarter wave plate 15, first positive lens 16, aperture 17, non-linear positive dispersion transparent solid material 18, be fixed on the slide block 19 on the optics slide rail, second positive lens 20, second quarter wave plate 21 and analyzer 22, its position relation is: after the ultra-short pulse laser of a horizontal polarization passes through first quarter wave plate 15, polarization state becomes elliptic polarization, passing aperture 17 by 16 focusing of first positive lens then incides in the non-linear positive dispersion transparent solid material 18, the pulse of its outgoing is incided second quarter wave plate 21 by second positive lens 20 again, at last by analyzer 22 outputs.
The quick shaft direction of described first quarter wave plate 15 becomes 22.5 ° with the polarization direction of the linear polarization ultrashort pulse of incident.
Described first quarter wave plate 15 and second quarter wave plate 21 are the zero level quarter wave plate, and its quick shaft direction is mutually orthogonal.
Described first positive lens 16 and second positive lens 20 are positioned at sustained height, and its spacing is both focal length sums and confocal point.Described aperture 17 is positioned at the geometrical focus place of first positive lens 16.
Described non-linear positive dispersion transparent solid material 18 is positioned at after the geometrical focus of first positive lens 16 and is installed on the optics slide rail 19, changes the distance of described non-linear positive dispersion transparent solid material 18 with respect to the geometrical focus of first positive lens 16 by the motion of this optics slide rail 19.
The optical axis direction of described analyzer 22 is vertical mutually with the polarization direction of the linear polarization ultrashort pulse of incident.
The ultrashort pulse of horizontal polarization incides on first quarter wave plate 15, the polarization direction of the quick shaft direction of first quarter wave plate 15 and incident ultrashort pulse becomes 22.5 °, behind first quarter wave plate 15, the polarization state of ultrashort pulse becomes elliptic polarization by the linear polarization of horizontal direction, passing aperture 17 by 16 focusing of first positive lens then carries out impinging perpendicularly in the non-linear positive dispersion transparent solid material 18 behind the spatial filtering, aperture is positioned at the geometrical focus place of first positive lens 16, can reach the effect of the high frequency spatial modulation that improves laser pulse by spatial filtering.Non-linear positive dispersion transparent solid material 18 is installed on the optics slide rail 19 and is positioned at after the geometrical focus of first positive lens 16, when the pulse of incident different-energy size, can change the distance of non-linear positive dispersion transparent solid material 18 by the motion of this optics slide rail 19, thereby avoid material to be damaged with respect to the geometrical focus of first positive lens 16.The ultrashort pulse of outgoing is collimated into parallel beam by second positive lens 20 again and incides on second quarter wave plate 21 of quick shaft direction perpendicular to first quarter wave plate 16 from non-linear positive dispersion transparent solid material 18, at last by optical axis direction analyzer 22 outputs vertical with the polarization direction of incident ultrashort pulse.The ultrashort pulse of elliptic polarization can produce the non linear elliptic rotation effect when propagating in non-linear positive dispersion transparent solid material 18, near the high strength of peak value of pulse is partly deflected, the polarization state of low intensive pulse base and satellite pulse is then constant substantially, when pulse during through second quarter wave plate 21 and analyzer 22, have only the main pulse vertical partly to export with the incident pulse polarization direction, the satellite pulse consistent with the incident pulse polarization direction then filtered, thereby reaches the effect of the time contrast that improves pulse.And also can be owing to self-focusing effect and the action of plasma that produces thereupon during by non-linear positive dispersion transparent solid material 18 in pulse, the pulse width compression.In the present invention, non-linear positive dispersion transparent solid material 18 is the BK7 glass of several millimeters thick, in order to utilize the self-focusing effect compression pulse width of ultrashort pulse in glass, will make the self focusing threshold power 1.8MW of incident pulse power greater than BK7 glass, incident pulse intensity is 10 usually
11W/cm
2
The present invention utilizes non linear elliptic rotation effect and the space-time self-focusing effect of high power ultrashort pulse in non-linear positive dispersion transparent solid material 18 transmission courses, and the spatial filtering effect of aperture 17 reaches the effect that strengthens time contrast, compression pulse and improve spatial modulation simultaneously, and need not other dispersion compensation and reflection unit, significantly reduce the energy loss of system, that whole device has is simple in structure, build advantage easy, easy to adjust.
Claims (3)
1, a kind of ultra-short pulsed laser wave filtering device, it is characterized in that by first quarter wave plate (15) that sets gradually with optical axis, first positive lens (16), aperture (17), non-linear positive dispersion transparent solid material (18), second positive lens (20), second quarter wave plate (21) and analyzer (22) constitute, distance is two focal length sums and confocal points between described first positive lens (16) and second positive lens (20), described aperture (17) is positioned at the focus of first positive lens (16), the quick shaft direction of described first quarter wave plate (15) becomes 22.5 ° with the polarization direction of the linear polarization ultra-short pulse laser of incident, described non-linear positive dispersion transparent solid material (18) is fixed on the slide block (19), this slide block (19) can move fixing on an optics slide rail, described first quarter wave plate (15) and second quarter wave plate (21) are the zero level quarter wave plate, and its quick shaft direction is mutually orthogonal, and the optical axis direction of described analyzer (22) is vertical mutually with the polarization direction of the linear polarization ultra-short pulse laser of incident.
2, ultra-short pulsed laser wave filtering device according to claim 1 is characterized in that described non-linear positive dispersion transparent solid material (18) is positioned at after the geometrical focus of first positive lens (15).
3, ultra-short pulsed laser wave filtering device according to claim 1 is characterized in that described non-linear positive dispersion transparent solid material (18) is a BK7 glass.
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| CN 200710038661 CN101038412A (en) | 2007-03-29 | 2007-03-29 | Ultra-short pulsed laser wave filtering device |
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| CN 200710038661 CN101038412A (en) | 2007-03-29 | 2007-03-29 | Ultra-short pulsed laser wave filtering device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278995A (en) * | 2013-04-12 | 2013-09-04 | 中山大学 | Full-wave-band adjustable highly-integrated femtosecond pulse compressor part |
| CN103676187A (en) * | 2012-09-10 | 2014-03-26 | 中国科学院理化技术研究所 | High-power laser image transfer space filtering device |
| CN108572463A (en) * | 2018-03-29 | 2018-09-25 | 北京理工大学 | A kind of pulse-series generator generating polarization state continuous transformation |
| CN117559200A (en) * | 2023-11-24 | 2024-02-13 | 清华大学 | Laser pulse time domain contrast enhancement method and system |
-
2007
- 2007-03-29 CN CN 200710038661 patent/CN101038412A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103676187A (en) * | 2012-09-10 | 2014-03-26 | 中国科学院理化技术研究所 | High-power laser image transfer space filtering device |
| CN103278995A (en) * | 2013-04-12 | 2013-09-04 | 中山大学 | Full-wave-band adjustable highly-integrated femtosecond pulse compressor part |
| CN108572463A (en) * | 2018-03-29 | 2018-09-25 | 北京理工大学 | A kind of pulse-series generator generating polarization state continuous transformation |
| CN117559200A (en) * | 2023-11-24 | 2024-02-13 | 清华大学 | Laser pulse time domain contrast enhancement method and system |
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