CN102323704B - Dispersion accommodation device - Google Patents
Dispersion accommodation device Download PDFInfo
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- CN102323704B CN102323704B CN201110268826.2A CN201110268826A CN102323704B CN 102323704 B CN102323704 B CN 102323704B CN 201110268826 A CN201110268826 A CN 201110268826A CN 102323704 B CN102323704 B CN 102323704B
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Abstract
The invention discloses a dispersion accommodation device which comprises a pulse stretching part and a pulse compressing part, wherein the pulse stretching part comprises a first polaroid, a first 1/2 lambda wave plate, a first Faraday polariscope, a second polaroid, a first plane reflector, a second plane reflector, a grating, a concave reflector, a first plane reflector and a fourth plane reflector; and the pulse compressing part comprises a third polaroid, a second 1/2 lambda wave plate, a second Faraday polariscope, a fourth polaroid, a fifth plane reflector, a grating, a ridge plane reflector and a sixth plane reflector. The dispersion accommodation device is characterized in that stretching and compressing operations can be simultaneously completed by using the same grating, thus use quantity of the gratings is reduced, cost is saved, space is saved, structure is more compact; meanwhile, the pulse compressing part of the dispersion accommodation device can realize compressing and dispersion regulating functions respectively according to the requirements of the system.
Description
Technical field
The present invention relates to ultra-short intense laser, be a kind of dispersion accommodation device for ultra-short intense laser system, be mainly applicable to ultrashort (10
-15~ 10
-12second) superpower (10
12~ 10
18watt) broadening and compression are carried out to laser pulse in laser system.
Background technology
Chirped pulse amplification (Chirped Pulse Amplification, be abbreviated as CPA) and optical parameter chirped pulse amplification (Optical Parametric Chirped Pulse Amplification, be abbreviated as OPCPA) be the classical way obtaining ultrashort, super strong laser pulse at present, be widely used in and built many terawatt (TW)s (namely 10
12w, is abbreviated as TW) level laser system, clap watts (namely 10
15w, is abbreviated as PW) level laser system and Chinese mugwort watts (namely 10
18w, is abbreviated as EW) level laser system.First such laser system utilizes the laser pulse of stretcher to femtosecond or subpicosecond to introduce certain chirp value, make pulse strenching, and then inject putting in advance of high-gain, when pulse energy reaches MJ magnitude or joule magnitude, by main amplifier, energy is brought up to the level of design again, finally utilize compressor reducer to introduce the chirp value contrary with stretcher, pulse width is restored, thus obtain the output of superpower ultrashort laser pulse.In such laser system, stretcher and compressor reducer are very important devices, and their appropriate design is very important to raising whole system performance.
At present, in ultra-short intense laser system, when the pulsewidth of the last compression pulse of system is 0.5-10ps time, pulse stretcher generally adopts reflective monochromatic light grid Martinez stretcher, and does not adopt Offner stretcher.Reason is that reflective monochromatic light grid Martinez stretcher is easy to adjust, quick, device is stablized, and Offner stretcher light path is complicated, regulate difficulty, the difficulty of processing of optical element is large, therefore, when meeting overall system and requiring, adopt easy to adjust, quick, stable device as far as possible.
In the reflective monochromatic light grid Martinez stretcher of employing, in order to ensure that light path is unimpeded, need at longitudinal direction, light path to be staggered certain position, but in order to ensure that stretcher provides the linear dispersion contrary with compressor reducer to system, this angle can not be too large.In fact, when the broadening amount of system requirements is very large, when limited raster size, in order to ensure enough spectral bandwidths, need to make broadened beam multiple-passing grating, namely stretcher adopts many logical structures, but more by the number of times of grating, then the angle needing broadened beam to stagger in a longitudinal direction is larger.Simultaneously in such stretcher, the size that grating longitudinal direction uses is limited, and namely under the normal master grating dimensional conditions bought, on grating longitudinal direction, the size of nearly 1/2 is not used, and the price of grating is very expensive, this waste is unfortunately.
Summary of the invention
The object of the invention is to the deficiency for above-mentioned existing ultra-intense ultra-short laser pulse dispersion accommodation device, provide a kind of dispersion accommodation device, this device only completes broadening and compression duty by one block of grating simultaneously, to reduce the usage quantity of grating, save cost, save space, make structure compacter, the compression section of apparatus of the present invention according to the needs of system, can realize the function of compression and dispersion adjustment respectively simultaneously.
Technical solution of the present invention is as follows:
A kind of dispersion accommodation device, comprise a platform, its feature is to comprise pulse strenching and pulse compression two parts:
Described pulse strenching part, described platform comprises: laser beam working direction the first polaroid successively treating broadening along pulse, one 1/2 wave plate, first Faraday polarization apparatus, second polaroid, first plane mirror, second plane mirror, grating, concave mirror, 3rd plane mirror and the 4th plane mirror, described grating is between described concave mirror and the 3rd described plane mirror, described concave mirror and grating are placed perpendicular to described flat surface, the incident ray of described grating has an elevation angle upwards, the 3rd described plane mirror front surface is positioned on the focal plane of described concave mirror along the center line being parallel to flat surface direction, the 3rd described plane mirror front surface has a downward angle of depression along the direction of testing table top, the angle of the optical axis of described grating and described grating diffration light beam is:
wherein: λ
0for laser center wavelength, γ is that dwell portion incides the incident ray of grating and the angle of described grating normal, and d is the inverse of the incisure density of described grating, and the 4th described plane mirror is vertical with the emergent ray of described grating,
Described pulse compression part comprises, on the platform along laser beam working direction the 3rd polaroid successively, 2 1/2 λ wave plate, second Faraday polarization apparatus, 4th polaroid, 5th plane mirror, grating, ridge plane mirror and the 6th plane mirror, described compression section incides the incident parallel of grating in described flat surface, it is identical with the angle that dwell portion incides the incident ray of grating and the normal of grating with the angle of the normal of grating that described compression section incides the incident ray of grating, the incident ray that incide described the compression section incident ray of grating and dwell portion incide grating lays respectively at the halves of described grating, the described minute surface of ridge mirror (26) and the angle of the diffraction optical axis of compression section are 45 °, the reflecting surface of described ridge mirror is along being parallel to the central axis in flat surface direction in the primary optical axis of described grating diffration light, the 6th described plane mirror is vertical with the emergent ray of described grating.
Described concave mirror, the first plane mirror, the second plane mirror, the 3rd plane mirror, the 4th plane mirror, the 5th plane mirror, ridge plane mirror and the 6th plane mirror, be all coated with the medium total reflection film corresponding to operation wavelength.
The radius-of-curvature of described concave mirror is 60 ~ 2000cm.
Described grating is reflection grating, and the scope of its incisure density is: 800 ~ 2000 lines/mm.
Distance between described concave mirror and described grating is 0.1 ~ 0.4 times of the radius-of-curvature value of concave mirror.
The described angle of depression or the scope at the elevation angle are 0.1 ° ~ 4 °.
The course of work of dispersion accommodation device of the present invention is:
Apparatus of the present invention comprise broadening and compression two parts, so the course of work is also described from these two parts respectively, specific as follows:
Dwell portion:
Seed laser is after first polaroid, become complete polarized light, complete polarized light line is after the one 1/2 wave plate, incident light polarization direction changes 45 °, then through the first Faraday polarization apparatus, polarization direction changes 45 ° again, change of polarized direction 90 ° when the polarization direction of the light now exported is relatively incident, this light is by the second polaroid transmission, and then after the first plane mirror and the reflection of the second plane mirror, incide on grating, different wave length composition in laser pulse launches on described grating diffration face, diffracted ray propagates on described concave mirror, propagate on the 3rd plane mirror after the reflection of this concave mirror, propagate on concave mirror after the 3rd plane mirror reflection again, get back to after being reflected by concave mirror on grating, again after optical grating diffraction, propagate on the 4th plane mirror, after the 4th plane mirror reflection, light returns along original optical path, export in the reflection of the first polaroid place.
Compression section:
Laser after amplification is after the 3rd polaroid, become complete polarized light, complete polarized light line is after the 2 1/2 λ wave plate, incident light polarization direction changes 45 °, then through the second Faraday polarization apparatus, polarization direction changes 45 ° again, change of polarized direction 90 ° when the polarization direction of the light now exported is relatively incident, this light is by the 4th polaroid transmission, and then after the 5th plane mirror reflection, incide on grating, different wave length composition in laser pulse launches on described grating diffration face, diffracted ray propagates on described ridge mirror, after ridge mirror reflection, get back on grating, again after optical grating diffraction, propagate on the 6th plane mirror, after the 6th plane mirror reflection, light returns along original optical path, export in the reflection of the 3rd polaroid place.
Dispersion accommodation device of the present invention has the following advantages:
1, only use one block of grating, complete broadening and compression duty simultaneously, decrease the usage quantity of grating, provide cost savings (note: under normal circumstances, complete broadening and compressor reducer task, needs the grating of use more than three pieces);
2, because this dispersion accommodation device only used one block of grating, make this structure compacter, save the space taken;
3, the compression section of this dispersion accommodation device can according to the needs of system, realize two kinds of different functions respectively, that is: 1), time energy less (energy is joule magnitude), can use as system-wide compressor reducer; 2) function of total system fine setting dispersion, by this compression section, can the system-wide negative dispersion of independent regulation, thus reach the function of independent regulation total system dispersion;
Accompanying drawing explanation
Fig. 1 is the present invention is only completed the dispersion accommodation device enforcement of broadening and compression duty simultaneously structural representation by one block of grating.
In figure: 1-grating 11-first polaroid 12-the 1 λ wave plate 13-first Faraday polarization apparatus 14-second polaroid 15-first plane mirror 16-second plane mirror 17-concave surface transmitting mirror 18-the 3rd plane mirror 19-the 4th plane mirror 21-the 3rd polaroid 22-the 2 1/2 λ wave plate 23-second Faraday polarization apparatus 24-the 4th polaroid 25-the 5th plane mirror 26-ridge mirror 27-the 6th plane mirror
Embodiment
Below in conjunction with embodiment and accompanying drawing, the invention will be further described, but should not limit the scope of the invention with this.
Embodiment 1:
The present embodiment 1 is the present invention is only completed the dispersion accommodation device of broadening and compression duty simultaneously wherein a kind of version by one block of grating, and its compression section completes compression.
First refer to Fig. 1, Fig. 1 is the present invention is only completed the dispersion accommodation device embodiment 1 of broadening and compression duty simultaneously structural representation by one block of grating, as seen from the figure, the formation of dispersion accommodation device embodiment 1 of the present invention comprises a platform, pulse strenching and pulse compression two parts:
Described pulse strenching part comprises, on the platform along laser beam working direction the first polaroid 11 successively, one 1/2 wave plate 12, first Faraday polarization apparatus 13, second polaroid 14, first plane mirror 15, second plane mirror 16, grating 1, concave mirror 17, 3rd plane mirror 18 and the 4th plane mirror 19, described grating 1 is between described concave mirror 17 and the 3rd described plane mirror 18, described concave mirror 17 and grating 1 are placed perpendicular to described flat surface, the incident ray of described grating 1 has an elevation angle upwards along the direction being parallel to experiment table top, the 3rd described plane mirror 18 front surface is positioned on the focal plane of described concave mirror 17 along the center line being parallel to experiment table top direction, the 3rd described plane mirror 18 front surface has a downward angle of depression along the direction of testing table top, described grating 1 with the angle of the optical axis of described grating 1 diffracted beam is:
wherein: λ
0for laser center wavelength, γ is that dwell portion incides the incident ray of grating 1 and the angle of described grating 1 normal, and d is the inverse of the incisure density of described grating, and the 4th described plane mirror (19) is vertical with the emergent ray of grating (1),
Described pulse compression part comprises, on the platform along laser beam working direction the 3rd polaroid 21 successively, 2 1/2 wave plate 22, second Faraday polarization apparatus 23, 4th polaroid 24, 5th plane mirror 25, grating 1, ridge plane mirror 26 and the 6th plane mirror 27, the incident ray of described compression section is parallel to described tabletop of platform, it is identical with the angle that the angle of the normal of grating 1 and dwell portion incide the incident ray of grating 1 and the normal of grating 1 that described compression section incides the incident ray of grating 1, the incident ray that incide described the compression section incident ray of grating 1 and dwell portion incide grating 1 lays respectively at the halves of described grating 1, the angle of the minute surface of described ridge mirror 26 and the diffraction optical axis of compression section is 45 °, the reflecting surface of described ridge mirror is along being parallel to the central axis in flat surface direction in the primary optical axis of the diffracted ray of described grating 1, the 6th described plane mirror 27 is vertical with the emergent ray of described grating 1.
Described concave mirror 17, first plane mirror 15, second plane mirror 16, the 3rd plane mirror 18, the 4th plane mirror 19, the 5th plane mirror 25, ridge plane mirror 26 and the 6th plane mirror 27, be all coated with the medium total reflection film corresponding to operation wavelength.
The described angle of depression or the value at the elevation angle are 0.74 °.Described dwell portion incides the incident ray of grating 1 and the angle of grating 1 normal is 70 °, and described grating 1 is 26.8 ° with the angle of described dwell portion primary optical axis, and the 4th described plane mirror 19 is vertical with the optical axis of outgoing dwell portion.
The primary optical axis of described dwell portion be incident ray after grating 1 diffraction, the direction of centre wavelength diffracted ray.
Described concave mirror 17, the 3rd plane mirror 18 and the 4th plane mirror 19 are all coated with 0 ° of medium total reflection film corresponding to operation wavelength 1053nm.
The first described plane mirror 15 and the second plane mirror 16 are all coated with 45 ° of medium total reflection films corresponding to operation wavelength 1053nm.
According to the system requirements of the present embodiment, the radius-of-curvature choosing described concave mirror 17 is 800cm.
According to the system requirements of the present embodiment, the incisure density choosing described grating 1 is 1740 lines/mm, and wherein the centre wavelength of laser is 1053nm.
According to the system requirements of the present embodiment, choosing between the 3rd described plane mirror 18 and described grating 1 is 0.22 times of concave reflection curvature radius value along the axial distance of dwell portion key light.
The part realizing pulse compression in this contrive equipment comprises the 3rd polaroid 21, 2 1/2 λ wave plate 22, second Faraday polarization apparatus 23, 4th polaroid 24, 5th plane mirror 25, grating 1, ridge plane mirror 26, 6th plane mirror 27, the 3rd described polaroid 21 is arranged in the light path of these device compression light beam input and output, it is characterized in that sharing one block of grating to realize pulse compression with foregoing dwell portion, be further characterized in that this compression section only realizes the compression duty of system with one piece of shared monochromatic light grid simultaneously, the incident ray of described compression section is parallel to experiment table top, the angle that incide described the compression section incident ray of grating 1 and the angle of grating 1 normal and dwell portion incide the incident ray of grating 1 and grating 1 normal is identical, and be distributed in the two ends of grating 1 respectively.Described ridge mirror minute surface 26 is 45 ° with the angle of compression section primary optical axis, and described ridge mirror 26 front surface is along being parallel to the central axis in experiment table top direction in the primary optical axis of compression section.
The primary optical axis of described compression section be the incident ray of compression section after grating 1 diffraction, the direction of its centre wavelength diffracted ray.
The 6th described plane mirror 27 is vertical with the emergent ray of compression section.
The 5th described plane mirror 25 and ridge plane mirror 26, be all coated with 45 ° of medium total reflection films corresponding to operation wavelength 1053nm.
The 6th described plane mirror 27 is coated with 0 ° of medium total reflection film corresponding to operation wavelength 1053nm.
Described ridge mirror 26 with between grating 1 along the axial distance of compression section key light and axial apart from identical along dwell portion key light between the 3rd described plane mirror 18 and grating 1.
Described dwell portion utilizes the first half of grating, and described compression section utilizes the latter half of grating, and the incident ray of described dwell portion and the incident ray of compression section lay respectively at the two ends of grating.
Embodiment 2:
The present embodiment is the another kind of version of dispersion accommodation device of the present invention, and its compression section can complete the function of dispersion adjustment.
First refer to Fig. 1, Fig. 1 is also the structural representation of dispersion accommodation device embodiment 2 of the present invention simultaneously, its basic parameter, structure are the same with the situation of embodiment 1, and difference is between the ridge mirror 26 described in compression section of the present embodiment 2 and grating 1 along 0.1 times that the axial distance of compression section key light is along the axial distance of dwell portion key light between the 3rd described plane mirror 18 and grating 1.
The concrete course of work of dispersion accommodation device of the present invention is:
Embodiment of the present invention (see figure 1) comprises broadening and compression two parts, so the course of work is also described from these two parts respectively, specific as follows:
Dwell portion:
Seed laser (i.e. the laser of dwell portion) is after first polaroid 11, become complete polarized light, complete polarized light line is after the one 1/2 λ wave plate 12, incident light polarization direction changes 45 °, then through the first Faraday polarization apparatus 13, polarization direction changes 45 ° again, change of polarized direction 90 ° when the polarization direction of the light now exported is relatively incident, this light is by the second polaroid 14 transmission, and then after the first plane mirror 15 and the reflection of the second plane mirror 16, incide on grating 1, different wave length composition in laser pulse launches on described grating diffration face, diffracted ray propagates on described concave mirror 17, propagate on the 3rd plane mirror 18 after the reflection of this concave mirror 17, propagate on concave mirror 17 after the 3rd plane mirror 18 reflects again, get back to after being reflected by concave mirror 17 on grating 1, again after grating 1 diffraction, propagate on the 4th plane mirror 19, after the 4th plane mirror 19 reflects, light returns along original optical path, export in the reflection of the first polaroid 11 place.
Compression section:
Laser (i.e. the laser of compression section) after amplification is after the 3rd polaroid 21, become complete polarized light, complete polarized light line is after the 2 1/2 λ wave plate 22, incident light polarization direction changes 45 °, then through the second Faraday polarization apparatus 23, polarization direction changes 45 ° again, change of polarized direction 90 ° when the polarization direction of the light now exported is relatively incident, this light is by the 4th polaroid 24 transmission, and then after the 5th plane mirror 25 reflects, incide on grating 1, different wave length composition in laser pulse launches on the diffraction surfaces of described grating 1, diffracted ray propagates on described ridge mirror 26, after ridge mirror 26 reflects, get back on grating 1, again after optical grating diffraction, propagate on the 6th plane mirror 27, after the 6th plane mirror 27 reflects, light returns along original optical path, export in the reflection of the 3rd polaroid 21 place.
Simultaneously the maximum feature of the present invention only uses one block of grating to complete broadening and compression duty, decrease the usage quantity of grating, provide cost savings, save space, make structure compacter, the compression section of apparatus of the present invention according to the needs of system, can realize the function of compression, dispersion adjustment respectively simultaneously.
Claims (6)
1. only completed a dispersion accommodation device for broadening and compression duty by one block of grating simultaneously, comprise a platform, it is characterized in that comprising pulse strenching and pulse compression two parts:
Described pulse strenching part comprises, on the platform along laser beam working direction the first polaroid (11) successively, one 1/2 λ wave plate (12), first Faraday polarization apparatus (13), second polaroid (14), first plane mirror (15), second plane mirror (16), grating (1), concave mirror (17), 3rd plane mirror (18) and the 4th plane mirror (19), described grating (1) is positioned between described concave mirror (17) and the 3rd described plane mirror (18), described concave mirror (17) and grating (1) are placed perpendicular to described flat surface, the incident ray of described grating (1) has an elevation angle upwards along the direction being parallel to experiment table top, the 3rd described plane mirror (18) front surface is positioned on the focal plane of described concave mirror (17) along the center line being parallel to experiment table top direction, the 3rd described plane mirror (18) front surface has a downward angle of depression along the direction of testing table top, described grating (1) with the angle of the optical axis of described grating (1) diffracted beam is:
wherein: λ
0for laser center wavelength, γ is that dwell portion incides the incident ray of grating (1) and the angle of described grating (1) normal, d is the inverse of the incisure density of described grating, and the 4th described plane mirror (19) is vertical with the emergent ray of grating (1),
Described pulse compression part comprises, on the platform along laser beam working direction the 3rd polaroid (21) successively, 2 1/2 λ wave plate (22), second Faraday polarization apparatus (23), 4th polaroid (24), 5th plane mirror (25), described grating (1), ridge plane mirror (26) and the 6th plane mirror (27), the incident ray that described compression section incides described grating (1) is parallel to described flat surface, it is identical with the angle that the angle of the normal of described grating (1) and dwell portion incide the incident ray of described grating (1) and the normal of described grating (1) that described compression section incides the incident ray of described grating (1), the incident ray that incide described the compression section incident ray of described grating (1) and dwell portion incide described grating (1) lays respectively at the halves of described grating (1), the described minute surface of ridge plane mirror (26) and the angle of the diffraction optical axis of compression section are 45 °, the reflecting surface of described ridge plane mirror is along being parallel to the central axis in flat surface direction in the primary optical axis of the diffracted ray of described grating (1), the 6th described plane mirror (27) is vertical with the emergent ray of described grating (1).
2. dispersion accommodation device according to claim 1, it is characterized in that described concave mirror (17), the first plane mirror (15), the second plane mirror (16), the 3rd plane mirror (18), the 4th plane mirror (19), the 5th plane mirror (25), ridge plane mirror (26) and the 6th plane mirror (27), be all coated with the medium total reflection film corresponding to operation wavelength.
3. dispersion accommodation device according to claim 1, is characterized in that the radius-of-curvature of described concave mirror (17) is 60 ~ 2000cm.
4. dispersion accommodation device according to claim 1, it is characterized in that described grating (1) is reflection grating, the scope of its incisure density is: 800 ~ 2000 lines/mm.
5. the dispersion accommodation device according to any one of Claims 1-4, the distance that it is characterized in that between described concave mirror (17) and described grating (1) is 0.1 ~ 0.4 times of the radius-of-curvature value of concave mirror (17).
6. the dispersion accommodation device according to any one of Claims 1-4, is characterized in that the scope at the described angle of depression or the elevation angle is 0.1 ° ~ 4 °.
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| CN201110268826.2A CN102323704B (en) | 2011-09-13 | 2011-09-13 | Dispersion accommodation device |
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|---|---|---|---|
| CN201110268826.2A CN102323704B (en) | 2011-09-13 | 2011-09-13 | Dispersion accommodation device |
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| CN102323704A CN102323704A (en) | 2012-01-18 |
| CN102323704B true CN102323704B (en) | 2014-12-17 |
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| CN108458787B (en) * | 2018-02-05 | 2019-08-23 | 中国科学院长春光学精密机械与物理研究所 | Echelle grating type space heterodyne Raman spectrometer light channel structure |
| CN114389133A (en) * | 2022-03-24 | 2022-04-22 | 广东利元亨智能装备股份有限公司 | Chirp pulse amplification method, laser processing apparatus, and storage medium |
Citations (2)
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| CN101067682A (en) * | 2007-06-01 | 2007-11-07 | 中国科学院上海光学精密机械研究所 | Folding reflective single optical grating expending device |
| US7486436B1 (en) * | 2007-03-29 | 2009-02-03 | Corning Incorporated | All fiber chirped pulse amplification system and method |
-
2011
- 2011-09-13 CN CN201110268826.2A patent/CN102323704B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7486436B1 (en) * | 2007-03-29 | 2009-02-03 | Corning Incorporated | All fiber chirped pulse amplification system and method |
| CN101067682A (en) * | 2007-06-01 | 2007-11-07 | 中国科学院上海光学精密机械研究所 | Folding reflective single optical grating expending device |
Non-Patent Citations (2)
| Title |
|---|
| Design and properties analysis of total internal reflection gratings for pulse compressor at 1053 nm;Qunyu Bi et al;《Current Applied Physics》;20100614;第11卷;第21-27页 * |
| 惆啾脉冲的光谱整形;郭爱林 等;《光学学报》;20090630;第29卷(第6期);全文 * |
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