CN2922216Y - High power and high energy ultrashort laser pulse widening device - Google Patents
High power and high energy ultrashort laser pulse widening device Download PDFInfo
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- CN2922216Y CN2922216Y CN 200620043909 CN200620043909U CN2922216Y CN 2922216 Y CN2922216 Y CN 2922216Y CN 200620043909 CN200620043909 CN 200620043909 CN 200620043909 U CN200620043909 U CN 200620043909U CN 2922216 Y CN2922216 Y CN 2922216Y
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Abstract
A high power and high energy ultrashort laser pulse widening device and a regulation method comprises two widening device, wherein, the first widening device is poisioned behind a seed laser with a fixed widening proportion, while the second widening device is posioned behind an OPA pre-amplification and realizes continuous tune for the second order chromatic dispersion, third order chromatic dispersion and fourth chromatic dispersion. The utility model characteristics in that the utility model realizing the widening of large widening proportion for the high power and high energy ultrashort laser pulse with a laser pulse width widened from 50 to 200 fs to 2 to 5 ns. At the same time the regulation difficult of large caliber grating in the compressor is greatly reduced due to continuous tune of the second widening device. Most regulation task of the compressor is finished by the second widening device, even the compressor does not need regulation after fist time regulation with a complete fixation and the regulation task is completed by the second widening device.
Description
Technical field
The utility model relates to superpower ultrashort laser, is the used chirped pulse stretcher of a kind of high power macro-energy ultrashort laser system, mainly is applicable to high-energy (200～2000 joules) ultrashort (10
-15～10
-12Second) superpower (10
12～10
15Watt) pulse stretching of laser system and improve the beam quality of ultrashort pulse.
Background technology
Chirped pulse amplifies (Chirped Pulse Amplification, be abbreviated as CPA) and optical parameter chirped pulse amplification (0ptical Parametric Chirped Pulse Amplification, be abbreviated as OPCPA) be to obtain classical way ultrashort, the ultra-intense laser pulse at present, be widely used in and built many terawatt (TW)s (promptly 10
12W is abbreviated as TW) level laser system and clap watt (promptly 10
15W is abbreviated as PW) the level laser system.It at first utilizes stretcher to introducing certain chirp value in the laser arteries and veins of femtosecond or subpicosecond, make pulse stretching, inject putting in advance of high-gain, when pulse energy reaches a joule magnitude, by main amplifier energy is brought up to the level of design again, utilize compressor reducer to introduce the chirp value opposite at last, pulse duration is restored, thereby obtain the ultra-short pulse laser output of high power macro-energy with stretcher.Wherein stretcher is an important device, and its appropriate design is very important to improving the whole system performance.At present, the scheme to laser pulse stretching that the superpower ultrashort laser device of the Vulcan of Britain Rutherford experiment chamber utilizes two stretchers to realize has obtained laser output energy 651J, the pulse duration of practicing shooting is 410fs, and power reaches 1.03PW, and the power density of focusing has reached 1.06 * 10
21Wcm
-2Experimental result (Workshop on Ultrahigh Density Plasma Production, Application and Theory forLaser Fusion Proceedings, 2005,16-25), this installs employed stretcher (J Collier, CHernandez-Gomez, " Double Decker Stretcher Design for the Petawatt Upgrade " .CLF Annual Report RAL-TR-2002-013,2001-2002pg 173) as shown in Figure 1, among the figure: 11, the 21-concave mirror, 12, the 22-convex reflecting mirror, 13-grating, 14, the 24-completely reflecting mirror.
This apparatus for widen and whole system operation process are: behind seed femtosecond laser first stretcher of process (1), the width of laser pulse is opened up 2.4ns, be injected in the OPA laser amplifier and amplify in advance, enter second stretcher (2) afterwards again and carry out second level amplification, the laser pulse width broadening is to 4.8ns, inject main amplifier and amplify, enter the compression pond at last laser pulse is compressed, obtain needed superpower high-energy ultra-short laser pulse.
The characteristics of this apparatus for widen are: two stretchers are stacked, can reduce whole device occupation space; Two shared same block of gratings of stretcher have reduced the usage quantity of grating.Its shortcoming also is obviously, because two stretchers are stacked, carrying out broadening is interactional when tuning, needs two stretchers to carry out synchronously simultaneously, in this case, the tuning task of the dispersion compensation of this system is actually and finishes in compressor reducer.Must strengthen the adjusting difficulty of heavy-caliber optical grating in the compressor reducer like this, particularly at present heavy-caliber optical grating need splice by grating mostly and obtains, and its adjusting difficulty is just bigger like this.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, a kind of superpower high-energy ultra-short laser pulse stretching device is provided, to improve the broadening ratio, reduce the adjusting difficulty of heavy-caliber optical grating in the compressor reducer greatly, finally obtain the ultrashort pulse output of high-contrast high power macro-energy.
Technical solution of the present utility model is as follows:
A kind of control method of superpower high-energy ultra-short laser pulse stretching, the core of this method are to adopt two same stretcher branch two-stages independently to carry out broadening, and first stretcher is placed on after the seed light source, and its broadening is than fixing; Second stretcher is placed on after the pre-amplification of optical parameter amplification (0ptical Parametric Amplification is called for short OPA), function with continuous tuning second order and high-order dispersion, the adjusting of second stretcher is compensation 2nd order chromatic dispersion earlier, compensates high-order dispersion again.
A kind of superpower high-energy ultra-short laser pulse stretching device, it is characterized in that by first stretcher and second stretcher) form, first stretcher is placed on after the seed light source, its broadening is than fixing, second stretcher is placed on after the pre-amplification of OPA, has the function of continuous tuning second order and high-order dispersion:
Described first stretcher is made up of the first column type concave mirror, the first column type convex reflecting mirror, first grating and first completely reflecting mirror; The described first column type concave mirror, the first column type convex reflecting mirror, first grating and first completely reflecting mirror place respectively on separately the adjustment rack, the medium that the described first column type concave mirror, the first column type convex reflecting mirror and first completely reflecting mirror all are coated with operation wavelength increases anti-film, and the outgoing beam of this first stretcher is perpendicular to the plane of reflection of described first completely reflecting mirror;
Described second stretcher is grouped into by dwell portion, 2nd order chromatic dispersion fine setting part and high-order dispersion trimming part:
Described dwell portion is successively by the second column type concave mirror, the second column type convex reflecting mirror, second grating and second completely reflecting mirror are formed, the described second column type concave mirror and the second column type convex reflecting mirror be placed on respectively separately five the dimension adjustment racks on, second grating is placed on the four-dimensional adjustment rack, second completely reflecting mirror is placed on the three-dimensional trim holder, the centre rotational axis of the described second column type concave mirror and the second column type convex reflecting mirror is on same straight line, the described second column type concave mirror, the medium that the second column type convex reflecting mirror and second completely reflecting mirror all are coated with operation wavelength increases anti-film;
Described 2nd order chromatic dispersion fine setting part is made up of two five dimension adjustment racks of the described second column type concave mirror and the second column type convex reflecting mirror;
Described high-order dispersion fine setting part is made up of plano-concave lens and biconvex lens and is placed between described second grating and second completely reflecting mirror, this plano-concave lens is placed on the five dimension adjustment racks, this biconvex lens is placed on the four-dimensional adjustment rack, the rotating shaft of described plano-concave lens and biconvex lens is on same straight line, and all lens are coated with the medium anti-reflection film of operation wavelength;
The outgoing beam of described second stretcher and described plano-concave lens and biconvex lens common optical axis and perpendicular to second completely reflecting mirror) the plane of reflection.
The broadening of described first stretcher is than fixing, and the broadening ratio and the high-order dispersion of described second stretcher are continuously-tunings.
The radius of curvature of the described first column type convex reflecting mirror is half of the first column type concave reflection curvature radius, distance between the two is the radius of curvature value of the first column type convex reflecting mirror, and the distance between the first column type concave mirror and first grating is 0.6～0.7 times of radius of curvature value of the first column type concave mirror.
The radius of curvature of the described second column type convex reflecting mirror is half of the second column type concave reflection curvature radius, distance between the two is the radius of curvature value of the second column type convex reflecting mirror, the second column type concave mirror and second grating) between distance be 0.6～0.7 times of radius of curvature value of the second column type concave mirror.
The grating line of described first grating and second grating is: 1200 lines/mm～1800 lines/mm.
The center thickness of described plano-concave lens is 1.1～2.5cm, and radius of curvature is 25～30cm, and lens material is a SSK4 glass; The center thickness of biconvex lens is 2.0～3.5cm, and the radius of curvature of first face is 30～35cm, and the radius of curvature of second face is 41～45cm, and lens material is a ZF10 glass.
Technique effect of the present utility model is:
1, can realize in the superpower ultrashort laser of the high power macro-energy system laser pulse being carried out the requirement of big broadening than broadening;
2, utilize two-stage that laser pulse is carried out broadening, meet the requirement of the big broadening ratio of whole macro-energy high power system.
3, maximum characteristics of the present utility model are that the broadening of first stretcher is than fixing, and second continuously-tuning that stretcher has 2nd order chromatic dispersion and high-order dispersion, thereby can reduce the adjusting difficulty of heavy-caliber optical grating in the compressor reducer greatly, allow the major part task of regulating in the compressor reducer realize by second stretcher, even just no longer regulate after can allowing compressor reducer adjust for the first time, be completely fixed, the adjusting task is all realized by the adjusting of second stretcher.
4, because the utility model can effectively compensate high-order dispersion, thereby promote the performance of whole system greatly, finally obtain to export in the ultrashort arteries and veins of high-contrast high power macro-energy.
Description of drawings:
Fig. 1 is existing superpower high-energy ultra-short laser pulse stretching device schematic diagram.
Fig. 2 is a superpower high-energy ultra-short laser pulse stretching device schematic diagram of the present utility model.
Among the figure: the 1-first stretcher 2-second stretcher 11-first column type concave mirror 21-second column type concave mirror 12-first column type convex reflecting mirror 22-second column type convex reflecting mirror 13 first grating 23-second grating 14 first completely reflecting mirror 24-second completely reflecting mirror 25-plano-concave lens 26- biconvex lens 31,32,33,43, the four- dimensional adjustment rack 41,42 of 46-, 45-five dimension adjustment racks 34,44-three-dimensional trim holder
Embodiment
Fig. 2 is the utility model superpower high-energy ultra-short laser pulse stretching device schematic diagram, as seen from the figure, the utility model superpower high-energy ultra-short laser pulse stretching device, form by first stretcher 1 and second stretcher 2, first stretcher 1 is placed on after the seed light source, its broadening is than fixing, and second stretcher 2 is placed on after the pre-amplification of OPA, has the function of continuous tuning second order and high-order dispersion:
Described first stretcher 1 is made up of the first column type concave mirror 11, the first column type convex reflecting mirror 12, first grating 13 and first completely reflecting mirror 14; The described first column type concave mirror 11, the first column type convex reflecting mirror 12, first grating 13 and first completely reflecting mirror 14 place respectively on separately the four- dimensional adjustment rack 31,32,33, the medium that the described first column type concave mirror 11, the first column type convex reflecting mirror 12 and first completely reflecting mirror 14 all are coated with operation wavelength increases anti-film, and the outgoing beam of this first stretcher is perpendicular to the plane of reflection of described first completely reflecting mirror 14;
Described second stretcher 2 is grouped into by dwell portion, 2nd order chromatic dispersion fine setting part and high-order dispersion trimming part:
Described dwell portion is successively by the second column type concave mirror 21, the second column type convex reflecting mirror 22, second grating 23 and second completely reflecting mirror 24 are formed, the described second column type concave mirror 21 and the second column type convex reflecting mirror 22 are placed on five dimension adjustment racks 41 separately respectively, on 42, second grating 23 is placed on the four-dimensional adjustment rack 43, second completely reflecting mirror 24 is placed on the three-dimensional trim holder 44, the centre rotational axis of the described second column type concave mirror 21 and the second column type convex reflecting mirror 22 is on same straight line, the described second column type concave mirror 21, the medium that the second column type convex reflecting mirror 22 and second completely reflecting mirror 24 all are coated with operation wavelength increases anti-film;
Described 2nd order chromatic dispersion fine setting part is made up of two five dimension adjustment racks 41,42 of the described second column type concave mirror 21 and the second column type convex reflecting mirror 22;
Described high-order dispersion fine setting part is made up of plano-concave lens 25 and biconvex lens 26 and is placed between described second grating 23 and second completely reflecting mirror 24, this plano-concave lens 25 is placed on the five dimension adjustment racks 45, this biconvex lens 26 is placed on the four-dimensional adjustment rack 46, the rotating shaft of described plano-concave lens 25 and biconvex lens 26 is on same straight line, and all lens are coated with the medium anti-reflection film of operation wavelength;
The outgoing beam of described second stretcher and described plano-concave lens 25 and biconvex lens 26 common optical axis and perpendicular to the plane of reflection of second completely reflecting mirror 24.
The broadening of described first stretcher 1, does not just need to regulate after debugging is good than fixing again.The broadening ratio and the high-order dispersion of second stretcher 2 are continuously-tunings.
The radius of curvature of the described first column type concave mirror 11 is 500～1000cm, the radius of curvature of the first column type convex reflecting mirror 12 is half of the first column type concave mirror, 11 radius of curvature, and distance between the two is the radius of curvature value of the first column type convex reflecting mirror 12.Distance between the first column type concave mirror 11 and first grating 13 is 0.6～0.7 times of radius of curvature value of the first column type concave mirror 11.
The radius of curvature of the described second column type concave mirror 21 is 700～1200cm, the radius of curvature of the second column type convex reflecting mirror 22 is half of the second column type concave mirror, 21 radius of curvature, and distance between the two is the radius of curvature value of the second column type convex reflecting mirror 22.Distance between the second column type concave mirror 21 and second grating 23 is 0.6～0.7 times of radius of curvature value of the second column type concave mirror 21.
The grating line of described first grating 13 and second grating 23 is: 1200 lines/mm～1800 lines/mm.
The center thickness of described plano-concave lens 25 is 1.1～2.5cm, and radius of curvature is 25～30cm, and lens material is a SSK4 glass; The center thickness of biconvex lens 26 is 2.0～3.5cm, and the radius of curvature of first face is 30～35cm, and the radius of curvature of second face is 41～45cm, and lens material is a ZF10 glass.
Described second completely reflecting mirror 24 is 6～10cm from the distance of biconvex lens 26.
The four- dimensional adjustment rack 31,32,46 of the biconvex lens 26 in the first column type concave mirror (11) in described first stretcher 1, the first column type convex reflecting mirror (12) and second stretcher 2 has three-dimensional angular adjustment and lift adjustment up and down.
The four- dimensional adjustment rack 33,43 of described first grating 13 and second grating 23 has three-dimensional angular adjustment and lift adjustment up and down.
The three- dimensional trim holder 34,44 of described first completely reflecting mirror 14 and second total reflection 24 has the angular adjustment of two dimension and lift adjustment up and down.
Five dimension adjustment racks 41,42 of the second column type concave mirror 21 in described second stretcher 2 and the second column type convex mirror 22 have three-dimensional angular adjustment, lift adjustment up and down and along the horizontal adjustment of directions X.
Five dimension adjustment racks 45 of described plano-concave lens 25 have three-dimensional angular adjustment, lift adjustment up and down and along the horizontal adjustment of directions X.
Compare with other superpower high-energy ultra-short laser pulse stretching device, the utility model superpower high-energy ultra-short laser pulse stretching device has following difference:
1, adopt two independently stretcher branch two-stage laser pulse is carried out broadening, reach the purpose of big broadening ratio;
2, the broadening of first stretcher 1 is than fixing, and second stretcher 2 has the ability of continuous independent regulation 2nd order chromatic dispersion and high-order dispersion, thereby can reduce the adjusting difficulty of heavy-caliber optical grating in the compressor reducer on the one hand greatly, part or all of adjusting task reach with compressor reducer, adjusting by second stretcher 2 realizes, the 2nd order chromatic dispersion of whole system and high-order dispersion are well compensated, thereby obtain the ultrashort laser pulse output of high-contrast high power macro-energy.
The concrete course of work of the utility model superpower high-energy ultra-short laser pulse stretching device is:
Laser pulse branch two-stage is carried out broadening, first order broadening is: seed laser incides on first grating 13 of first stretcher 1, different wave length composition in the laser pulse launches on the diffraction surfaces of first grating 13, diffracted ray propagates on the first column type concave mirror 11, through propagating on the first column type convex reflecting mirror 12 after 11 reflections of the first column type concave mirror, again through propagating into once more on the first column type concave mirror 11 after 12 reflections of the first column type convex reflecting mirror, by propagating on first grating 13 after 11 reflections of the first column type concave mirror, through first grating 13 once more behind the diffraction, after the reflection through first completely reflecting mirror 14, light returns along original optical path, in the output of incident ray place, finished first order broadening to this.
The laser pulse that comes out from first order broadening enters OPA and amplifies in advance, enters second level broadening afterwards.
Second level broadening is: from the pre-laser pulse of coming out that amplifies of OPA, incide on second grating 23 of second stretcher 2, different wave length composition in the laser pulse launches on the diffraction surfaces of second grating 23, diffracted ray propagates on the second column type concave mirror 21, again through propagating on the second column type convex reflecting mirror 22 after 21 reflections of the second column type concave mirror, again through propagating into once more on the second column type concave mirror 21 after 22 reflections of the second column type convex reflecting mirror, by propagating on second grating 23 after 21 reflections of the second column type concave mirror, through second grating 23 once more behind the diffraction, vertically enter high-order dispersion fine setting plano-concave lens 25 and biconvex lens 26 devices, through the light of plano-concave lens 25 and biconvex lens 26 outgoing after the reflection of second completely reflecting mirror 24, return along former road, so far finish partial broadening.
For second order residual in the system and high-order dispersion full remuneration are fallen, in design process, require to allow the second order of stretcher and compressor reducer and high-order dispersion match best earlier, thereby can be in the preliminary debugging process of whole system the second order and the high-order dispersion of system be matched optimum state, the residual second order of remaining trace and high-order dispersion are by finishing with lower regulating mechanism.Principle is: compensation 2nd order chromatic dispersion earlier compensates high-order dispersion again.
For 2nd order chromatic dispersion full remuneration residual in the chirped pulse is fallen, move along X positive direction or X negative direction simultaneously by regulating the dimension of five in second stretcher 2 adjustment rack 41,42, thereby change the distance of " equivalence " grating pair of second stretcher 2, get final product so that 2nd order chromatic dispersion changes, and can not influence other light path, reach the effect of independent continuous tuning 2nd order chromatic dispersion, and then 2nd order chromatic dispersion full remuneration residual in the system is fallen.
For high-order dispersion full remuneration residual in the chirped pulse is fallen, realize by regulating dimension adjustment rack 45 of five in second stretcher 2 and four-dimensional adjustment rack 46, the relative motion that allows five dimension adjustment racks 45 and four-dimensional adjustment rack 46 do perpendicular to rotating shaft, it is relative oscilaltion, the compound lens that plano-concave lens 25 and biconvex lens 26 are formed produces the aberration longitudinally of trace, this part aberration can be used for compensating third-order dispersion, and do not influence other chromatic dispersion, thereby reach the effect of independent continuous tuning third-order dispersion, and then the residual third-order dispersion full remuneration of system is fallen; By allowing five dimension adjustment racks 45 do moving of relative biconvex lens 26 along rotating shaft, promptly move horizontally, the compound lens that plano-concave lens 25 and biconvex lens 26 are formed produces the horizontal aberration of trace, this part aberration can be used for compensating fourth-order dispersion, and do not influence other chromatic dispersion, thereby reach the effect of independent continuous tuning fourth-order dispersion, and then the residual fourth-order dispersion full remuneration of system is fallen.So both reached big broadening ratio, again each rank chromatic dispersion had been compensated completely.
Experiment shows: characteristics of the present utility model are to realize the broadening of the big broadening ratio of superpower high-energy ultra-short laser pulse, and laser pulse width is from 50～200fs broadening to 2～5ns; Because the continuously-tuning of second stretcher, can reduce the adjusting difficulty of heavy-caliber optical grating in the compressor reducer greatly, allow the major part task of regulating in the compressor reducer realize by second stretcher, even just no longer regulate after can allowing compressor reducer adjust for the first time, be completely fixed, the adjusting task all can be realized by the adjusting of second stretcher.
Claims (6)
1, a kind of superpower high-energy ultra-short laser pulse stretching device, it is characterized in that forming by first stretcher (1) and second stretcher (2), first stretcher (1) is placed on after the seed light source, its broadening is than fixing, second stretcher (2) is placed on after the pre-amplification of OPA, has the function of continuous tuning second order and high-order dispersion:
Described first stretcher (1) is made up of the first column type concave mirror (11), the first column type convex reflecting mirror (12), first grating (13) and first completely reflecting mirror (14); The described first column type concave mirror (11), the first column type convex reflecting mirror (12), first grating (13) and first completely reflecting mirror (14) place respectively on separately the adjustment rack, the medium that the described first column type concave mirror (11), the first column type convex reflecting mirror (12) and first completely reflecting mirror (14) all are coated with operation wavelength increases anti-film, and the outgoing beam of this first stretcher is perpendicular to the plane of reflection of described first completely reflecting mirror (14);
Described second stretcher (2) is grouped into by dwell portion, 2nd order chromatic dispersion fine setting part and high-order dispersion trimming part:
Described dwell portion is successively by the second column type concave mirror (21), the second column type convex reflecting mirror (22), second grating (23) and second completely reflecting mirror (24) are formed, the described second column type concave mirror (21) and the second column type convex reflecting mirror (22) are placed on five dimension adjustment racks (41 separately respectively, 42) on, second grating (23) is placed on the four-dimensional adjustment rack (43), second completely reflecting mirror (24) is placed on the three-dimensional trim holder (44), the centre rotational axis of the described second column type concave mirror (21) and the second column type convex reflecting mirror (22) is on same straight line, the described second column type concave mirror (21), the medium that the second column type convex reflecting mirror (22) and second completely reflecting mirror (24) all are coated with operation wavelength increases anti-film;
Described 2nd order chromatic dispersion fine setting part is made up of two the five dimension adjustment racks (41,42) of the described second column type concave mirror (21) and the second column type convex reflecting mirror (22);
Described high-order dispersion fine setting part is made up of plano-concave lens (25) and biconvex lens (26) and is placed between described second grating (23) and second completely reflecting mirror (24), this plano-concave lens (25) is placed on the five dimension adjustment racks (45), this biconvex lens (26) is placed on the four-dimensional adjustment rack (46), the rotating shaft of described plano-concave lens (25) and biconvex lens (26) is on same straight line, and all lens are coated with the medium anti-reflection film of operation wavelength;
The outgoing beam of described second stretcher and described plano-concave lens (25) and biconvex lens (26) common optical axis and perpendicular to the plane of reflection of second completely reflecting mirror (24).
2, superpower high-energy ultra-short laser pulse stretching device according to claim 1, the broadening that it is characterized in that described first stretcher (1) are than fixing, and the broadening ratio and the high-order dispersion of described second stretcher (2) are continuously-tunings.
3, superpower high-energy ultra-short laser pulse stretching device according to claim 1, the radius of curvature that it is characterized in that the described first column type convex reflecting mirror (12) is half of first column type concave mirror (11) radius of curvature, distance between the two is the radius of curvature value of the first column type convex reflecting mirror (12), and the distance between the first column type concave mirror (11) and first grating (13) is 0.6～0.7 times of radius of curvature value of the first column type concave mirror (11).
4, superpower high-energy ultra-short laser pulse stretching device according to claim 1, the radius of curvature that it is characterized in that the described second column type convex reflecting mirror (22) is half of second column type concave mirror (21) radius of curvature, distance between the two is the radius of curvature value of the second column type convex reflecting mirror (22), and the distance between the second column type concave mirror (21) and second grating (2 3) is 0.6～0.7 times of radius of curvature value of the second column type concave mirror (21).
5, superpower high-energy ultra-short laser pulse stretching device according to claim 1 is characterized in that the grating line of described first grating (13) and second grating (23) is: 1200 lines/mm～1800 lines/mm.
6, according to each described superpower high-energy ultra-short laser pulse stretching device of claim 1 to 5, the center thickness that it is characterized in that described plano-concave lens (25) is 1.1～2.5cm, and radius of curvature is 25～30cm, and lens material is a SSK4 glass; The center thickness of biconvex lens (26) is 2.0～3.5cm, and the radius of curvature of first face is 30～35cm, and the radius of curvature of second face is 41～45cm, and lens material is a ZF10 glass.
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| CN 200620043909 CN2922216Y (en) | 2006-07-14 | 2006-07-14 | High power and high energy ultrashort laser pulse widening device |
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| CN 200620043909 CN2922216Y (en) | 2006-07-14 | 2006-07-14 | High power and high energy ultrashort laser pulse widening device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102844941A (en) * | 2010-02-24 | 2012-12-26 | 爱尔康手术激光股份有限公司 | High power femtosecond laser with adjustable repetition rate and simplified structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102844941A (en) * | 2010-02-24 | 2012-12-26 | 爱尔康手术激光股份有限公司 | High power femtosecond laser with adjustable repetition rate and simplified structure |
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Granted publication date: 20070711 |