CN102866557A - Single-grating multi-pass pulse widening device - Google Patents
Single-grating multi-pass pulse widening device Download PDFInfo
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- CN102866557A CN102866557A CN2012103571636A CN201210357163A CN102866557A CN 102866557 A CN102866557 A CN 102866557A CN 2012103571636 A CN2012103571636 A CN 2012103571636A CN 201210357163 A CN201210357163 A CN 201210357163A CN 102866557 A CN102866557 A CN 102866557A
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Abstract
The invention relates to the technical field of laser, in particular to a single-grating multi-pass pulse widening device which comprises an optical isolation unit, a four-pass single-grating widening unit and a pass number control unit. The optical isolation unit is used for leading in and leading out of incident light and emergent light, the four-pass single-grating widening unit is used for widening laser pulses, and the pass number control unit is used for controlling laser pulse widening magnification. The single-grating multi-pass pulse widening device with the structure has the advantages that a pulse widening effect can be multiplied under the condition that the structure of the widening device is unchanged, and optical paths are not required to be adjusted when the pulse widening effect is multiplied; and the widening magnification can be controlled optionally, so that a perfect widening effect can be realized.
Description
Technical field
The present invention relates to laser technology field, refer to specifically a kind of monochromatic light grid lead to the pulse stretcher device more.
Background technology
At present along with the demand to high repetition, high pulse energy ultrashort pulse laser, requirement to its single pulse energy is also more and more higher, in order to obtain more single pulse energy, generally need to amplify again ultrashort pulse pulsewidth elder generation broadening, can improve like this energy extraction efficiency and improve damage threshold.Yet the many employings of existing stretcher is monochromatic light grid four-way broadening mode, and this kind mode will increase the broadening effect and just must change parameter and need to readjust light path.
In addition, be accompanied by the increase of broadening amount, the volume of stretcher also along with rapid increase, is made troubles to use.
Summary of the invention
For the defective that exists in the prior art and problem, the object of the invention provides a kind of stretcher that can overcome defects.
The invention provides a kind of monochromatic light grid and lead to the pulse stretcher device more, it comprises:
Optical isolator element is used for importing and the derivation of incident light and emergent light;
Four-way single optical grating expending unit is used for the broadening to femtosecond and picosecond laser pulse;
Logical numerical control unit processed is used for the control to the laser pulse stretching multiple.
Preferably, described optical isolator element comprises film polaroid A, Faraday polarization apparatus and half-wave plate A, and described film polaroid A, Faraday polarization apparatus and half-wave plate A set gradually along the incident light incident direction.
More preferably, described optical isolator element also comprises film polaroid C, and described film polaroid C is used for the reflection emergent light.
Preferably, described four-way single optical grating expending unit is made of plane total reflective mirror A, grating, plane total reflective mirror B, 45 ° of total reflective mirrors and concave mirror successively, incident light by described logical numerical control unit processed after, after 45 ° of total reflective mirror reflections, be incident to grating, through optical grating diffraction to concave mirror, reflex to plane total reflective mirror A through concave mirror, total reflective mirror A is reflected back concave mirror through the plane, reflex to for the second time grating through concave mirror, to plane total reflective mirror B, through plane total reflective mirror B reflection, be reflected back logical numerical control unit processed along original optical path through optical grating diffraction.
More preferably, described grating ruling line direction is vertical with the polarization direction of described incident light.
Preferably, described logical numerical control unit processed is made of logical number controller, film polaroid B and plane total reflective mirror C, described logical number controller, film polaroid B set gradually along described incident light incident direction, and described plane total reflective mirror C is used for the laser pulse of film polaroid B reflection is reflected back along original optical path.
More preferably, described logical number controller is Pockers cell.
Preferably, described incident light is horizontal polarization light.
Compared with prior art, the present invention has the following advantages:
1, the present invention can be in the situation that does not change the stretcher structure at double increase pulse stretcher effect;
2, the present invention does not need to regulate light path when increasing the pulse stretcher effect;
3, the present invention can arbitrarily control multiple of stretcher, thus the broadening effect of realizing ideal.
Description of drawings
Fig. 1 is total index path of the present invention;
Fig. 2 is the index path of optoisolator unit;
Fig. 3 is the index path of four-way single optical grating expending device unit;
Fig. 4 is the logical number controller index path during making alive not in the logical number controller unit;
Index path when Fig. 5 is the logical number controller making alive that leads in the number controller unit;
Concrete symbol description is as follows;
1-film polaroid A 2-Faraday polarization apparatus
3-half-wave plate A 4-film polaroid B
6-45 ° of total reflective mirror of 5-Pockers cell
7-grating 8-concave mirror
Total reflective mirror A 10-plane, 9-plane total reflective mirror B
11-plane total reflective mirror C 12-film polaroid C
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.
As shown in Figure 1, in one embodiment of the invention, the invention provides a kind of monochromatic light grid and lead to the pulse stretcher device more, it comprises: optical isolator element, be used for importing and the derivation of incident light and emergent light, and wherein incident light is horizontal polarization light; Four-way single optical grating expending unit is used for the broadening to laser pulse; Logical numerical control unit processed is used for the control to the laser pulse stretching multiple.
As shown in Figure 2, the optical isolator element among the present invention comprises film polaroid A 1, Faraday polarization apparatus 2 and half-wave plate A3, and wherein film polaroid A 1, Faraday polarization apparatus 2 and half-wave plate A3 set gradually along the incident light incident direction.At first incident light is first by film polaroid A 1, then by Faraday polarization apparatus 2, this moment, the polarization direction of incident light was rotated in the forward 45 °, again by half-wave plate A3, then 45 ° of the reverse rotations of the polarization direction of incident light, so incident light keeps horizontal polarization direction to continue incident.Because the optical direction of half-wave plate A1 is relevant with incident direction, and the optical direction of Faraday polarization apparatus 2 and incident direction are irrelevant, so the emergent light that penetrates from logical numerical control unit processed is by behind the half-wave plate A3, the polarization direction of emergent light is rotated in the forward 45 °, again by behind the Faraday polarization apparatus 2, the outgoing polarisation of light oppositely is rotated in the forward 45 ° again, and this moment, emergent light became orthogonal polarized light, is exporting through film polaroid A 1 back reflection.
In a preferred embodiment of the invention, the optoisolator unit also comprises film polaroid C12, and film polaroid C12 is used for the reflection emergent light, can make like this incident direction of emergent light and incident light parallel.
As shown in Figure 3, four-way single optical grating expending unit among the present invention comprises successively by plane total reflective mirror A9, grating 7, plane total reflective mirror B10,45 ° of total reflective mirrors 6 and concave mirror 8 consist of, incident light is by after leading to numerical control unit processed, after 6 reflections of 45 ° of total reflective mirrors, be incident to for the first time grating 7 to be slightly larger than Littrow angle, be diffracted into concave mirror 8 through grating 7, reflex to plane total reflective mirror A9 through concave mirror 8, total reflective mirror A9 is reflected back concave mirror 8 through the plane, reflex to for the second time grating 7 through concave mirror 8, be diffracted into plane total reflective mirror B10 through grating 7, through plane total reflective mirror B10 reflection, be reflected back into logical numerical control unit processed along original optical path.
In a preferred embodiment of the invention, the delineation line direction of grating 7 and horizontal polarization polarisation of light perpendicular direction, this moment is very high to the efficient of horizontal polarization optical diffraction, generally can reach more than 95%.
Shown in Figure 4 and 5, logical numerical control unit processed among the present invention is made of logical number controller, film polaroid B4 and plane total reflective mirror C11, logical number controller and film polaroid B4 set gradually along described polarized light incident direction, wherein logical number controller can be Pockers cell 5, and described plane total reflective mirror C11 is used for the laser pulse of film polaroid B4 reflection is reflected back along original optical path.
When Pockers cell 5 not during making alive, after the horizontal polarization light of incident passes through first Pockers cell 5, keep the horizontal polarization attitude to enter four-way monochromatic light grid pulse stretcher device, light behind the broadening still is horizontal polarization light, return logical numerical control unit processed along former road, and keep the horizontal polarization attitude by logical numerical control unit processed.
When Pockers cell 5 adds half-wave voltage, the horizontal polarization light of incident is by behind the Pockers cell 5, the polarization state half-twist, become vertical polarization by horizontal polarization, after entering four-way monochromatic light grid pulse stretcher unit, because 7 pairs of vertical polarization light diffraction efficiencies of grating are extremely low, after laser pulse passes through grating 8 diffraction four times, can think without back light, and when logical number controller is returned in the pulse that Pockers cell 5 pressurization advances into four-way monochromatic light grid pulse stretcher device, because Pockers cell 5 has added half-wave voltage, by its polarization state half-twist behind the Pockers cell 5, become the vertical polarization attitude by the horizontal polarization attitude, reflex to plane total reflective mirror C11 at film polaroid B4 place, after plane total reflective mirror C11 reflection, former road is returned and is again passed through again half-twist of Pockers cell 5 rear polarizer attitudes, revert to the horizontal polarization attitude and enter four-way monochromatic light grid pulse stretcher unit, so by control Pockers cell pressing time, can control the number of times that enters four-way monochromatic light grid pulse stretcher device, and then realize that eight is logical, 16 is logical, 30 two-ways etc. pulse stretcher.
Certainly, adopt above-mentioned optimal technical scheme just for the ease of understanding to illustrating that the present invention carries out, the present invention also can have other embodiment, protection scope of the present invention is not limited to this.In the situation that does not deviate from spirit of the present invention and essence thereof, the person of ordinary skill in the field works as can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection domain of claim of the present invention.
Claims (8)
1. monochromatic light grid lead to the pulse stretcher device more, it is characterized in that, comprising:
Optical isolator element is used for importing and the derivation of incident light and emergent light;
Four-way single optical grating expending unit is used for the broadening to femtosecond and picosecond laser pulse;
Logical numerical control unit processed is used for the control to the laser pulse stretching multiple.
2. monochromatic light grid according to claim 1 lead to the pulse stretcher device more, it is characterized in that, described optical isolator element comprises film polaroid A (1), Faraday polarization apparatus (2) and half-wave plate A(3), described film polaroid A (1), Faraday polarization apparatus (2) and half-wave plate A(3) set gradually along the incident light incident direction.
3. monochromatic light grid according to claim 2 lead to the pulse stretcher device more, it is characterized in that described optical isolator element also comprises film polaroid C(12), described film polaroid C(12) for the reflection emergent light.
4. monochromatic light grid according to claim 1 lead to the pulse stretcher device more, it is characterized in that, described four-way single optical grating expending unit is successively by plane total reflective mirror A(9), grating (7), plane total reflective mirror B(10), 45 ° of total reflective mirrors (6) and concave mirror (8) consist of, incident light by described logical numerical control unit processed after, after 45 ° of total reflective mirrors (6) reflection, be incident to grating (7), be diffracted into concave mirror (8) through grating (7), reflex to plane total reflective mirror A(9 through concave mirror (8)), through plane total reflective mirror A(9) be reflected back concave mirror (8), reflex to for the second time grating (7) through concave mirror (8), be diffracted into plane total reflective mirror B(10 through grating (7)), through plane total reflective mirror B(10) reflection, be reflected back logical numerical control unit processed along original optical path.
5. monochromatic light grid according to claim 4 lead to the pulse stretcher device more, it is characterized in that, described grating (7) delineation line direction is vertical with the polarization direction of described incident light.
6. monochromatic light grid according to claim 1 lead to the pulse stretcher device more, it is characterized in that, described logical numerical control unit processed is by logical number controller, film polaroid B(4) and plane total reflective mirror C(11) consist of, described logical number controller, film polaroid B(4) set gradually described plane total reflective mirror C(11 along described incident light incident direction) be used for film polaroid B(4) laser pulse of reflection reflects back along original optical path.
7. monochromatic light grid according to claim 6 lead to the pulse stretcher device more, it is characterized in that described logical number controller is Pockers cell (5).
8. the described monochromatic light grid of each claim lead to the pulse stretcher device more according to claim 1-7, it is characterized in that described incident light is horizontal polarization light.
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| CN201210357163.6A CN102866557B (en) | 2012-09-21 | 2012-09-21 | The how logical pulse stretcher device of monochromatic light grid |
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| CN201210357163.6A CN102866557B (en) | 2012-09-21 | 2012-09-21 | The how logical pulse stretcher device of monochromatic light grid |
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| CN102866557B CN102866557B (en) | 2015-10-28 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104570379A (en) * | 2015-01-20 | 2015-04-29 | 中国科学院上海应用物理研究所 | Reflection-type grating pair pulse width stretcher |
| CN108767629A (en) * | 2018-03-26 | 2018-11-06 | 中国科学院上海光学精密机械研究所 | The active multi-way chirped pulse stretcher of big energy |
| CN109407354A (en) * | 2018-11-26 | 2019-03-01 | 杭州奕力科技有限公司 | A kind of tunable pulse broadening device of transmission-type monochromatic light grid multi-pass |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5329398A (en) * | 1992-11-05 | 1994-07-12 | Novatec Laser Systems, Inc. | Single grating laser pulse stretcher and compressor |
| CN101840125A (en) * | 2010-04-21 | 2010-09-22 | 北京大学 | Negative dispersion pulse widening optical fiber amplifying device |
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2012
- 2012-09-21 CN CN201210357163.6A patent/CN102866557B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5329398A (en) * | 1992-11-05 | 1994-07-12 | Novatec Laser Systems, Inc. | Single grating laser pulse stretcher and compressor |
| CN101840125A (en) * | 2010-04-21 | 2010-09-22 | 北京大学 | Negative dispersion pulse widening optical fiber amplifying device |
Non-Patent Citations (2)
| Title |
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| 侯洵 等: "低重复率的Ti：Al2O3飞秒激光放大器研究", 《光子学报》 * |
| 杨建军 等: "八通式单光栅展宽器的特性研究", 《光子学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104570379A (en) * | 2015-01-20 | 2015-04-29 | 中国科学院上海应用物理研究所 | Reflection-type grating pair pulse width stretcher |
| CN104570379B (en) * | 2015-01-20 | 2017-07-18 | 中国科学院上海应用物理研究所 | A kind of reflection-type grating is to pulse stretcher device |
| CN108767629A (en) * | 2018-03-26 | 2018-11-06 | 中国科学院上海光学精密机械研究所 | The active multi-way chirped pulse stretcher of big energy |
| CN109407354A (en) * | 2018-11-26 | 2019-03-01 | 杭州奕力科技有限公司 | A kind of tunable pulse broadening device of transmission-type monochromatic light grid multi-pass |
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| CN102866557B (en) | 2015-10-28 |
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Granted publication date: 20151028 Termination date: 20180921 |