CN109143559B - Miniaturized pulse stretcher - Google Patents
Miniaturized pulse stretcher Download PDFInfo
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- CN109143559B CN109143559B CN201811233922.1A CN201811233922A CN109143559B CN 109143559 B CN109143559 B CN 109143559B CN 201811233922 A CN201811233922 A CN 201811233922A CN 109143559 B CN109143559 B CN 109143559B
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- mirror
- grating
- light
- concave spherical
- plane mirror
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/02—Catoptric systems, e.g. image erecting and reversing system
- G02B17/06—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror
- G02B17/0605—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror using two curved mirrors
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/4233—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive element [DOE] contributing to a non-imaging application
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
Abstract
The invention discloses a miniaturized pulse stretcher, which adopts a grating, a concave spherical mirror and a convex mirror to stretch light, and adopts a second plane mirror to vertically reflect the light diffracted by the grating to the second plane mirror back to the grating, thus, a folding structure is adopted, on one hand, the return of an optical primary path is facilitated, and on the other hand, the secondary stretching of the light is realized, compared with a conventional ofner stretcher, the whole size of the original pulse stretcher is reduced under the condition of realizing the same stretching amount, and the pulse stretcher has outstanding substantive characteristics and remarkable progress; in addition, the optical fiber collimator is adopted for light input and output, so that the optical fiber ultrafast laser is convenient to use.
Description
Technical Field
The present invention relates to a miniaturized pulse stretcher.
Background
With the continuous development of industrial femtosecond ultrafast lasers, the amplification of ultrashort pulses has been a very headache problem in the scientific research world for a long time. Extremely short pulses are detrimental to absorbing energy in the amplification cutoff and high peak power are extremely prone to damage to the optical components in the amplifier. By enlarging the cross-sectional area of the pulse, a part of the problems can be solved, but the area enlargement brings about a reduction in energy density, which is more unfavorable for absorbing stored energy of the gain medium, and the size of the spot diameter that can be enlarged also reaches a limit because of the difficulty of crystal growth. To amplify ultra-high peak power laser pulses, gerard Mourou and Donna Strickland invented chirped pulse amplification techniques and thus obtained 2018 Nobel physics prize. The chirped pulse amplification technology enables the limit of the reach of the super laser to be 10 15 W/cm 2 One way is increased to 10 25 W/cm 2 The above. The core principle is that the stretcher is used for stretching the pulse, the peak power of the pulse is reduced, then the conventional amplification is carried out, and the narrow pulse width is retracted by the pressure, so that the extremely high peak power is obtained. How much peak power a laser can achieve is largely determined by the stretcher's stretching ability. Early Mourou used fiber optic techniques that were broadened and did not allow for a significant amount of broadening. Conventional is the use of offner stretcher and fiber stretcher. Offner stretcher is often used in solid-state scientific ultrafast lasers because of the capability of bearing larger power and self-adjusting and matching of parameters, is huge and is not beneficial to industry due to the severe use environmentAnd the like in large-scale applications.
No miniaturized large-spread-amount optical fiber coupling type offner stretcher has been developed so far. Therefore, how to overcome the above-mentioned drawbacks has become an important issue to be solved by the person skilled in the art.
Disclosure of Invention
The present invention overcomes the deficiencies of the prior art and provides a miniaturized pulse stretcher.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a miniaturized pulse stretcher, comprising a fiber collimator 1, a first plane mirror 2, a grating 3, a concave spherical mirror 4, a convex mirror 5 and a second plane mirror 6, wherein the first plane mirror 2 is used for reflecting collimated emergent light of the fiber collimator 1 to the grating 3 and diffracting the light of the grating 3 to the first plane mirror 2 into the fiber collimator 1, the grating 3 is used for diffracting the light reflected by the first plane mirror 2 to the concave spherical mirror 4, and diffracting the light reflected by the concave spherical mirror 4 to the second plane mirror 6 or diffracting the light reflected by the concave spherical mirror 4 to the first plane mirror 2, the first plane mirror 2 and the second plane mirror 6 are positioned on the same outer side of the grating 3 and are staggered, the concave spherical mirror 4 and the convex mirror 5 are arranged concentrically, the convex mirror 5 is used for diffracting the light reflected by the concave spherical mirror 4 to the second plane mirror 6, and the grating 6 is used for diffracting the light reflected by the concave spherical mirror 4 to the second plane mirror 6 to the second plane mirror 3; the optical pulse stretching process is as follows: the collimated outgoing light of the optical fiber collimator 1 is reflected to the grating 3 through the first plane mirror 2, the grating 3 diffracts the light to the concave spherical mirror 4, the concave spherical mirror 4 converges and reflects the light to the convex mirror 5, the convex mirror 5 reflects the light back to the concave spherical mirror 4, the concave spherical mirror 4 reflects the light back to the grating 3, and the grating 3 diffracts the light to the second plane mirror 6; the second plane mirror 6 then reflects light perpendicularly back onto the grating 3, the grating 3 diffracts light onto the concave spherical mirror 4, the concave spherical mirror 4 reflects light converging onto the convex mirror 5, the convex mirror 5 reflects light back onto the concave spherical mirror 4, the concave spherical mirror 4 reflects light back onto the grating 3, the grating 3 diffracts light onto the first plane mirror 2, and the first plane mirror 2 reflects light into the fiber collimator 1.
In a miniaturized pulse stretcher as described above, the grating 3 employs a transmission grating which is positioned between the concave spherical mirror 4 and the convex mirror 5 and is staggered in height so as not to hinder the reflection of light between the concave spherical mirror 4 and the convex mirror 5.
In the miniaturized pulse stretcher, the tail of the optical fiber collimator 1 is connected with an optical circulator through an optical fiber.
Compared with the prior art, the invention has the beneficial effects that:
1. the pulse stretcher adopts a grating, a concave spherical mirror and a convex mirror to stretch light, and adopts a second plane mirror to diffract the light diffracted by the grating to the second plane mirror to vertically reflect the light back to the grating, so that a folding structure is adopted, on one hand, the return of an optical primary path is facilitated, and on the other hand, the secondary stretching of the light is realized, compared with a conventional offner stretcher, the whole size of the pulse stretcher is reduced under the condition of realizing the same stretching amount, and the pulse stretcher has outstanding substantive characteristics and remarkable progress; in addition, the optical fiber collimator is adopted for light input and output, so that the optical fiber ultrafast laser is convenient to use.
2. The grating adopts a transmission grating which is positioned between the concave spherical mirror and the convex mirror and staggered in height so as not to obstruct the reflection of light between the concave spherical mirror and the convex mirror, thus being convenient for better reducing the overall size of the pulse stretcher.
3. The tail of the optical fiber collimator is connected with an optical circulator through an optical fiber, so that the light of a laser seed source is conveniently input into the pulse stretcher and the light which is stretched by the pulse stretcher is conveniently output through the optical circulator, and the application is convenient.
Drawings
Fig. 1 is a schematic structural diagram of the present case.
Detailed Description
The following examples are provided to illustrate the features of the present invention and other related features in further detail to facilitate understanding by those skilled in the art:
as shown in fig. 1, a miniaturized pulse stretcher comprises an optical fiber collimator 1, a first plane mirror 2, a grating 3, a concave spherical mirror 4, a convex mirror 5 and a second plane mirror 6, wherein the first plane mirror 2 is used for reflecting collimated emergent light of the optical fiber collimator 1 to the grating 3 and diffracting the light of the grating 3 to the first plane mirror 2 into the optical fiber collimator 1, the grating 3 is used for diffracting the light reflected by the first plane mirror 2 to the concave spherical mirror 4, and is used for diffracting the light reflected by the concave spherical mirror 4 to the second plane mirror 6 or diffracting the light reflected by the concave spherical mirror 4 to the first plane mirror 2, the first plane mirror 2 and the second plane mirror 6 are positioned on the same outer side of the grating 3 and have a stagger between the positions, the concave spherical mirror 4 and the convex mirror 5 are arranged concentrically, the convex surface 5 is used for diffracting the light reflected by the concave spherical mirror 4 to the second plane mirror 6, and the light reflected by the concave spherical mirror 4 is diffracted by the second plane mirror 6 to the second plane mirror 3; the optical pulse stretching process is as follows: the collimated outgoing light of the optical fiber collimator 1 is reflected to the grating 3 through the first plane mirror 2, the grating 3 diffracts the light to the concave spherical mirror 4, the concave spherical mirror 4 converges and reflects the light to the convex mirror 5, the convex mirror 5 reflects the light back to the concave spherical mirror 4, the concave spherical mirror 4 reflects the light back to the grating 3, and the grating 3 diffracts the light to the second plane mirror 6; the second plane mirror 6 then reflects light perpendicularly back onto the grating 3, the grating 3 diffracts light onto the concave spherical mirror 4, the concave spherical mirror 4 reflects light converging onto the convex mirror 5, the convex mirror 5 reflects light back onto the concave spherical mirror 4, the concave spherical mirror 4 reflects light back onto the grating 3, the grating 3 diffracts light onto the first plane mirror 2, and the first plane mirror 2 reflects light into the fiber collimator 1.
As described above, the pulse stretcher adopts the grating 3, the concave spherical mirror 4 and the convex mirror 5 to stretch light, and adopts the second plane mirror 6 to vertically reflect the light diffracted by the grating 3 to the second plane mirror 6 back to the grating 3, so that the folded structure is adopted, on one hand, the return of the light path is facilitated, and on the other hand, the secondary stretching of the light is realized, which is beneficial to reducing the overall size of the original pulse stretcher under the condition of realizing the same stretching amount compared with the conventional ofner stretcher, and has outstanding substantive characteristics and remarkable progress; in addition, the optical fiber collimator 1 is adopted for inputting and outputting light, so that the optical fiber ultrafast laser is convenient to use.
As described above, in the embodiment, the grating 3 is a transmission grating, which is located between the concave spherical mirror 4 and the convex mirror 5 and is staggered in height so as not to obstruct the reflection of light between the concave spherical mirror 4 and the convex mirror 5, so that the overall size of the pulse stretcher is reduced better.
As described above, in the embodiment, the grating 3 may be another kind of grating, such as a reflection grating, and the light reflected by the first plane mirror 2 is diffracted by the reflection grating onto the concave spherical mirror 4, and the light reflected by the concave spherical mirror 4 is diffracted onto the second plane mirror 6 or onto the first plane mirror 2.
As described above, in the specific implementation, the tail of the optical fiber collimator 1 is connected with the optical circulator through the optical fiber, so that the light of the laser seed source is conveniently input into the pulse stretcher and the light output after the stretching of the pulse stretcher is conveniently applied.
As described above, the present disclosure protects a miniaturized pulse stretcher, and all technical schemes with the same or similar structures as the present disclosure should be shown as falling within the protection scope of the present disclosure.
Claims (3)
1. A miniaturized pulse stretcher, characterized by comprising an optical fiber collimator (1), a first plane mirror (2), a grating (3), a concave spherical mirror (4), a convex mirror (5) and a second plane mirror (6), wherein the first plane mirror (2) is used for reflecting collimated emergent light of the optical fiber collimator (1) onto the grating (3) and reflecting light diffracted by the grating (3) onto the first plane mirror (2) into the optical fiber collimator (1), the grating (3) is used for diffracting light reflected by the first plane mirror (2) onto the concave spherical mirror (4), and is used for diffracting light reflected by the concave spherical mirror (4) onto the second plane mirror (6) or onto the first plane mirror (2), the first plane mirror (2) and the second plane mirror (6) are positioned at the same outer side of the grating (3), and the concave spherical mirror (4) are arranged in a staggered manner, and the concave spherical mirror (4) are arranged, the second plane mirror (6) is used for vertically reflecting the light diffracted by the grating (3) to the second plane mirror (6) back to the grating (3); the optical pulse stretching process is as follows: the collimated emergent light of the optical fiber collimator (1) is reflected to the grating (3) through the first plane mirror (2), the grating (3) diffracts the light to the concave spherical mirror (4), the concave spherical mirror (4) converges and reflects the light to the convex mirror (5), the convex mirror (5) reflects the light back to the concave spherical mirror (4), the concave spherical mirror (4) reflects the light back to the grating (3), and the grating (3) diffracts the light to the second plane mirror (6); then second plane mirror (6) is with light perpendicular reflection back on grating (3), grating (3) is again with light diffraction to on concave sphere mirror (4), concave sphere mirror (4) is with light collection reflection to on convex mirror (5), convex mirror (5) is with light reflection back on concave sphere mirror (4), concave sphere mirror (4) is with light reflection back on grating (3), grating (3) is with light diffraction to on first plane mirror (2), first plane mirror (2) is with light reflection in fiber collimator (1).
2. A miniaturized pulse stretcher according to claim 1 characterized in that the grating (3) employs a transmission grating which is located between the concave spherical mirror (4) and the convex mirror (5) and staggered in height so as not to hinder the reflection of light between the concave spherical mirror (4) and the convex mirror (5).
3. A miniaturized pulse stretcher according to claim 1 or 2 characterized in that the tail of the fiber collimator (1) is connected with an optical circulator by means of an optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811233922.1A CN109143559B (en) | 2018-10-23 | 2018-10-23 | Miniaturized pulse stretcher |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811233922.1A CN109143559B (en) | 2018-10-23 | 2018-10-23 | Miniaturized pulse stretcher |
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| CN109143559A CN109143559A (en) | 2019-01-04 |
| CN109143559B true CN109143559B (en) | 2023-07-25 |
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| CN201811233922.1A Active CN109143559B (en) | 2018-10-23 | 2018-10-23 | Miniaturized pulse stretcher |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070237192A1 (en) * | 2006-03-31 | 2007-10-11 | Das Palash P | Confocal pulse stretcher |
| 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 |
| CN201044033Y (en) * | 2007-06-01 | 2008-04-02 | 中国科学院上海光学精密机械研究所 | Folded reflexion type single-optical grating stretching device |
| CN208888465U (en) * | 2018-10-23 | 2019-05-21 | 广东华快光子科技有限公司 | A kind of pulse stretcher convenient for miniaturization setting |
-
2018
- 2018-10-23 CN CN201811233922.1A patent/CN109143559B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070237192A1 (en) * | 2006-03-31 | 2007-10-11 | Das Palash P | Confocal pulse stretcher |
| 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 |
| CN201044033Y (en) * | 2007-06-01 | 2008-04-02 | 中国科学院上海光学精密机械研究所 | Folded reflexion type single-optical grating stretching device |
| CN208888465U (en) * | 2018-10-23 | 2019-05-21 | 广东华快光子科技有限公司 | A kind of pulse stretcher convenient for miniaturization setting |
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| CN109143559A (en) | 2019-01-04 |
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Effective date of registration: 20220415 Address after: 528400 floors 1 and 2, No. 28, Yuquan Road, Torch Development Zone, Zhongshan City, Guangdong Province Applicant after: GUANGDONG HUAYI LASER TECHNOLOGY Co.,Ltd. Address before: No. 28, Yuquan Road, Torch Development Zone, Zhongshan City, Guangdong Province, 528400 Applicant before: GUANGDONG HUAKUAI PHOTON TECHNOLOGY CO.,LTD. |
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