CN201044033Y - Folding reflection type single-grating widening device - Google Patents
Folding reflection type single-grating widening device Download PDFInfo
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- CN201044033Y CN201044033Y CNU2007200705578U CN200720070557U CN201044033Y CN 201044033 Y CN201044033 Y CN 201044033Y CN U2007200705578 U CNU2007200705578 U CN U2007200705578U CN 200720070557 U CN200720070557 U CN 200720070557U CN 201044033 Y CN201044033 Y CN 201044033Y
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Abstract
A folded reflection type single grating widening device comprises a cylindrical concave mirror, a grating, an 1/2 lambda plate, a first plane mirror and a second plane mirror, wherein the 1/2 lambda plate is positioned on a light path of light beam input and output of the device, the device is characterized by further comprising a third plane mirror, the first plane mirror is positioned on an optical axis between the cylindrical concave mirror and the grating and is close to the grating, or the first plane mirror is positioned on an extension line of the cylindrical concave mirror and the optical axis of the grating and is close to the position of the grating, the mirror image of the third plane mirror relative to the first plane mirror is positioned on a focal plane of the cylindrical concave mirror, and the value range of an included angle between the first plane mirror and the optical axis is 45-90 degrees. The utility model has the biggest characteristics of compact structure, use in a flexible way, can realize the requirement to the big aspect ratio of laser pulse among the superstrong ultrashort laser system of high power high energy.
Description
Technical field
The utility model relates to superpower ultrashort laser, is a kind of folding reflective single optical grating expending device that is used for the chirped pulse 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 strenching of laser system.
Background technology
Chirped pulse amplifies (Chirped Pulse Amplification, be abbreviated as CPA) and optical parameter chirped pulse amplification (Optical 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 that the laser pulse of femtosecond or subpicosecond is introduced certain chirp value, make pulse strenching, 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 width 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 total system performance.
A few days ago, in high power macro-energy ultrashort laser system, when the pulsewidth of the last compression pulse of system was 0.5-10ps, pulse stretcher generally adopted the reflective single optical grating expending device, and does not adopt ffner stretcher.Reason is that the reflective single optical grating expending device is easy to adjust, quick, device is stable, and ffner stretcher light path complexity is regulated difficulty, therefore satisfying under the situation that overall system requires, adopts easy to adjust, quick, stable device as far as possible.But the reflective single optical grating expending device that adopts also has its shortcoming at present: one, occupation space is bigger; Two, in order to make light path certain position of staggering at longitudinal direction, the longitudinal size of grating can not be too big.And in the ultrashort laser system and device of high power macro-energy, after main amplifier designs, spaces etc. all are conditional, if so can carry out suitable adjustment to the design of original reflective single optical grating expending device, under the situation that keeps original advantage, realize being suitable for the needs of big laser aid, be that very big practical significance is arranged more flexible and changeablely.
Summary of the invention
The purpose of this utility model is the deficiency at above-mentioned existing superpower high-energy ultra-short laser pulse stretching device, and a kind of folding reflective single optical grating expending device is provided, and to save the space, structure is compact more.
Technical solution of the present utility model is as follows:
A kind of folding reflective single optical grating expending device, comprise the column type concave mirror, grating, 1/2 λ wave plate, first plane mirror, second plane mirror, described 1/2 λ wave plate is positioned on the light path of light beam input and output of this device, it is characterized in that the 3rd plane mirror in addition, described first plane mirror is on the optical axis between described column type concave mirror and the grating and near this grating, or described first plane mirror is positioned on the extensions of described column type concave mirror and grating optical axis and near the position of described grating, described the 3rd plane mirror is positioned on the focal plane of described column type concave mirror about the mirror image of first plane mirror, the span of the angle of first plane mirror and described optical axis is 45 °～90 °, and the angle of described grating and described optical axis is:
Wherein: λ
0Be laser center wavelength, γ is the incident angle of laser,
D is the incisure density of described grating.
Described first plane mirror and the distance of described grating on optical axis are 2～8cm.
Described column type concave mirror, first plane mirror, second plane mirror and the 3rd plane mirror all are coated with the medium total reflection film corresponding to operation wavelength.
The radius-of-curvature of described column type concave mirror is 700～1200cm.
The optional scope of the incisure density of described grating is: 1200 lines/mm～1800 lines/mm.
Distance between described column type concave mirror and the described grating is 0.2～0.3 times of radius-of-curvature value of column type concave mirror.
The course of work of the reflective single optical grating expending device that the utility model is folding is:
Seed laser through 1/2 λ wave plate after, incide on the diffraction grating, different wave length composition in the laser pulse launches on described grating diffration face, diffracted ray propagates on the described column type concave mirror, propagate on first plane mirror through after this column type concave reflection mirror reflection, again through propagating on the 3rd plane mirror after the first plane reflection mirror reflection, by getting back to first plane mirror after the 3rd plane reflection mirror reflection, once more through getting back to after the first plane reflection mirror reflection on the described column type concave mirror, again after this column type concave reflection mirror reflection, propagate on the grating, through grating once more behind the diffraction, after the reflection through second completely reflecting mirror, light returns along original optical path, in the reflection output of 1/2 λ wave plate place.
Compare with original reflective single optical grating expending device, the folding reflective single optical grating expending device of the utility model has following difference:
1, compact conformation, Mrs has reduced the shared lateral separation of stretcher;
2, because the utility model has two kinds of structures, can select suitable structure according to getable raster size, therefore very flexible.
3, 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;
Description of drawings
Fig. 1 is existing reflective single optical grating expending device synoptic diagram.
Fig. 2 is the structural representation of the folding reflective single optical grating expending device embodiment 1 of the utility model
Fig. 3 is the structural representation of the folding reflective single optical grating expending device embodiment 2 of the utility model.
Among the figure: the 1-column type concave mirror 2-grating 3-first plane mirror 4-second plane mirror 6-the 3rd plane mirror 5-1/2 λ wave plate 6 '-be the mirror image of the 3rd plane mirror about first plane mirror
Embodiment
The utility model is described in further detail below in conjunction with embodiment and accompanying drawing, but should not limit protection domain of the present utility model with this.
See also Fig. 2 earlier, Fig. 2 is the structural representation of the folding reflective single optical grating expending device embodiment 1 of the utility model, as seen from the figure, the formation of the reflective single optical grating expending device embodiment 1 that the utility model is folding comprises column type concave mirror 1, grating 2,1/2 λ wave plate 5, first plane mirror 3, second plane mirror 4, described 1/2 λ wave plate 5 is positioned on the light path of light beam input and output of this device, it is characterized in that the 3rd plane mirror 6 in addition, described first plane mirror 3 is on the optical axis between described column type concave mirror 1 and the grating 2 and near described grating 2, first plane mirror 3 in the front of grating 2 along optical axis direction 6cm place, described the 3rd plane mirror 6 is positioned on the focal plane of described column type concave mirror 1 about the mirror image 6 ' of first plane mirror 3, and first plane mirror 3 is 60 ° with the angle of described optical axis.Described grating 2 with the angle of described optical axis is:
Wherein: λ
0Be laser center wavelength, γ is the incident angle of laser, and d is the incisure density of described grating.
Described column type concave mirror 1, first plane mirror 3, second plane mirror 4 and the 3rd plane mirror 6 all are coated with the medium total reflection film corresponding to operation wavelength.
The radius-of-curvature of described column type concave mirror 1 is 900cm.Distance between column type concave mirror 1 and the grating 2 is 0.242 times of radius-of-curvature value of column type concave mirror 1, i.e. 217.8cm.
The incisure density of described grating is 1740 lines/mm, and the incident angle of employing is 69.5 °, and the centre wavelength of laser is 1053nm, and the angle of grating and optical axis is 26.4 °.
Described column type concave mirror 1 is vertical with the surface level at optical axis place.
Described plane mirror 4 is vertical with the light that incides plane mirror 4.
Fig. 3 is the structural representation of the folding reflective single optical grating expending device embodiment 2 of the utility model.As seen from the figure, 1 difference is that the position of first plane mirror 3 is different to embodiment 2 with embodiment, described first plane mirror 3 is on the extensions of described column type concave mirror 1 and grating 2 optical axises and near the position of described grating 2,6 ' be the mirror image of plane mirror 6 about plane mirror 3, wherein 6 ' be positioned on the focal plane of column type concave mirror 1.
The concrete course of work of the reflective single optical grating expending device of the utility model new type foldable is:
The utility model embodiment 1 is identical with the course of work of embodiment 2 (seeing Fig. 2 and Fig. 3), specific as follows: seed laser through 1/2 λ wave plate after, incide on the diffraction grating 2, different wave length composition in the laser pulse launches on the diffraction surfaces of diffraction grating 2, diffracted ray propagates on the column type concave mirror 1, through propagating on the plane mirror 3 after 1 reflection of column type concave mirror, again through propagating on the plane mirror 6 after plane mirror 3 reflections, by getting back to plane mirror 3 after plane mirror 6 reflections, after plane mirror 3 reflections, get back on the column type concave mirror 1 once more, after passing through the mirror reflection of column type concave reflection once more, propagate on the grating 2, through grating 2 once more behind the diffraction, through after the reflection of completely reflecting mirror 4, light returns along original optical path, in the reflection output of 1/2 λ wave plate place.
The maximum characteristics of the reflective single optical grating expending device that the utility model is folding are compact conformations, use flexibly, can realize in the superpower ultrashort laser of the high power macro-energy system requirement to the big broadening ratio of laser pulse.
Claims (6)
1. folding reflective single optical grating expending device, comprise column type concave mirror (1), grating (2), 1/2 λ wave plate (5), first plane mirror (3), second plane mirror (4), described 1/2 λ wave plate (5) is positioned on the light path of light beam input and output of this device, it is characterized in that the 3rd plane mirror (6) in addition, described first plane mirror (3) is positioned on the optical axis between described column type concave mirror (1) and the grating (2) and near described grating (2), or described first plane mirror (3) is positioned on the extensions of described column type concave mirror (1) and grating (2) optical axis and near the position of described grating (2), described the 3rd plane mirror (6) is positioned on the focal plane of described column type concave mirror (1) about the mirror image of first plane mirror (3), first plane mirror (3) is 45 °～90 ° with the span of the angle of described optical axis, and described grating (2) with the angle of described optical axis is:
Wherein: λ
0Be laser center wavelength, γ is the incident angle of laser, and d is the incisure density of described grating.
2. folding reflective single optical grating expending device according to claim 1 is characterized in that described first plane mirror (3) and the distance of described grating (2) on optical axis are 2～8cm.
3. folding reflective single optical grating expending device according to claim 1 is characterized in that described column type concave mirror (1), first plane mirror (3), second plane mirror (4) and the 3rd plane mirror (6) all are coated with the medium total reflection film corresponding to operation wavelength.
4. folding reflective single optical grating expending device according to claim 1, the radius-of-curvature that it is characterized in that described column type concave mirror (1) is 700～1200cm.
5. folding reflective single optical grating expending device according to claim 1 is characterized in that the optional scope of incisure density of described grating (2) is: 1200 lines/mm～1800 lines/mm.
6. according to each described folding reflective single optical grating expending device of claim 1 to 5, it is characterized in that distance between described column type concave mirror (1) and the described grating (2) is 0.2～0.3 times of radius-of-curvature value of column type concave mirror (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200705578U CN201044033Y (en) | 2007-06-01 | 2007-06-01 | Folding reflection type single-grating widening device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200705578U CN201044033Y (en) | 2007-06-01 | 2007-06-01 | Folding reflection type single-grating widening device |
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| CN201044033Y true CN201044033Y (en) | 2008-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200705578U Expired - Fee Related CN201044033Y (en) | 2007-06-01 | 2007-06-01 | Folding reflection type single-grating widening device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107112707A (en) * | 2015-06-10 | 2017-08-29 | 株式会社菲尔光学 | Line beam forming apparatus |
| CN109143559A (en) * | 2018-10-23 | 2019-01-04 | 广东华快光子科技有限公司 | A kind of pulse stretcher of miniaturization |
-
2007
- 2007-06-01 CN CNU2007200705578U patent/CN201044033Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107112707A (en) * | 2015-06-10 | 2017-08-29 | 株式会社菲尔光学 | Line beam forming apparatus |
| CN107112707B (en) * | 2015-06-10 | 2020-07-14 | 株式会社菲尔光学 | Line beam forming device |
| CN109143559A (en) * | 2018-10-23 | 2019-01-04 | 广东华快光子科技有限公司 | A kind of pulse stretcher of miniaturization |
| CN109143559B (en) * | 2018-10-23 | 2023-07-25 | 广东华奕激光技术有限公司 | Miniaturized pulse stretcher |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080402 |