CN209561848U - Pulse shortener and femtosecond pulse laser - Google Patents
Pulse shortener and femtosecond pulse laser Download PDFInfo
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Abstract
The utility model relates to field of laser device technology, provide a kind of pulse shortener, including diffraction grating, first reflection microscope group and the second reflection microscope group, optical path is formed between the diffraction side of diffraction grating and the second reflection microscope group to turn back section, diffraction grating has the incidence point for the first time for receiving incident light, for incident light to be directed to the eye point for the first time of the first reflection microscope group, for receiving the secondary incidence point of the first reflection microscope group reflected light, for the reflected light of the first reflection microscope group to be directed to the secondary eye point of the second reflection microscope group, for receiving the last incidence point of the last reflected light path of the second reflection microscope group and for by the last eye point of the optical output of last incidence point diffraction.A kind of femtosecond pulse laser is additionally provided, including above-mentioned pulse shortener.The utility model cooperates single diffraction grating that the effect of Compressed pulse width can be realized by the first reflection microscope group and the second reflecting mirror group, and not only overall structure is simple and compact, also reduces laser cost.
Description
Technical field
The utility model relates to field of laser device technology, specially a kind of pulse shortener and femtosecond pulse laser.
Background technique
High pulse energy, high-peak power femtosecond-pulse fiber laser have very in fields such as industrial Precision Machinings
Important application.It is to realize the effective ways of technical grade femto-second laser using chirped pulse amplification technique (CPA), it is main former
Reason is to broaden the seed source of femtosecond to hundred picosecond magnitudes through stretcher, is then amplified, and compressor is finally utilized
By output pulse width compression and back femtosecond, the femtosecond pulse output of high pulse energy, high-peak power is realized.
However the pulse shortener in traditional femtosecond pulse laser is realized using a pair of of diffraction body grating,
Want to realize preferable compression effectiveness, it is necessary to assure keep the high depth of parallelism between grating, adjust difficulty greatly and increase system
Complexity, be unfavorable for the long-time stability of system, while reducing the compactness of system；Diffraction body grating is a kind of high
Expensive optical device, the compressor using a pair of of optical grating constitution is expensive, is unfavorable for the reduction of laser cost.
Utility model content
The purpose of this utility model is to provide a kind of pulse shortener and femtosecond pulse lasers, pass through the first reflection
Microscope group and the second reflecting mirror group cooperate single diffraction grating that the effect of Compressed pulse width can be realized, not only overall structure
It is simple and compact, and also reduce laser cost.
To achieve the above object, the utility model embodiment provides the following technical solutions: a kind of pulse shortener, including spreads out
Penetrate grating, first reflection microscope group and second reflection microscope group, the diffraction side of the diffraction grating and it is described second reflection microscope group it
Between form optical path and turn back section,
The diffraction grating has incidence point for the first time for receiving incident light, for the incident light to be directed at described the
The eye point for the first time of one reflection microscope group, the secondary incidence point for receiving the first reflection microscope group reflected light, for will be described
The reflected light of first reflection microscope group is directed at the secondary eye point of the second reflection microscope group, for receiving the second reflection microscope group
Last reflected light path last incidence point and for by the last eye point of the optical output of last incidence point diffraction.
Further, the diffraction grating is reflective diffraction gratings, the incidence point for the first time, the eye point for the first time, institute
State secondary incidence point, the secondary eye point, the last incidence point and the last eye point be respectively positioned on it is described reflective
The diffraction side of diffraction grating.
It further, further include for the incident light being directed at the reflective diffraction gratings and will be described in emergent light diversion
First light element mirror of reflective diffraction gratings, diffraction of the first light element mirror close to the reflective diffraction gratings
Side, the first light element mirror are mounted on the first adjustable microscope base.
It further, further include for by the second light element mirror derived from emergent light, the second light element mirror to be led
The light guiding surface of first light element mirror described in smooth surface face.
Further, the diffraction grating is transmissive diffraction grating, the incidence point for the first time, the secondary eye point, institute
It states last incidence point and the last eye point is respectively positioned on transmissive diffraction grating diffration side, the eye point for the first time
And the secondary incidence point is respectively positioned on the transmissive side of the transmissive diffraction grating.
It further, further include the third light element mirror installed close to the transmissive side of the transmissive diffraction grating, it is described
The guide-lighting side of third light element mirror, which has, to be received the next light of the secondary outgoing fixed fire and is directed at first reflecting mirror
First point of group, the guide-lighting side of the third light element mirror also have the reception next light of the first reflection microscope group reflection and will
Its second point for being directed at the secondary incidence point.
It further, further include for the incident light being directed at the transmissive diffraction grating and will be described in emergent light diversion
4th light element mirror of transmissive diffraction grating, the 4th light element mirror is close to the transmissive diffraction grating diffration
Side, the 4th light element mirror are mounted on the second adjustable microscope base.
It further, further include for by the 5th light element mirror derived from emergent light, the 5th light element mirror to be led
The light guiding surface of 4th light element mirror described in smooth surface face.
Further, the first reflection microscope group includes symmetrically arranged two piece of first reflecting mirror, two piece of first reflecting mirror
The setting of reflecting surface face.
The utility model embodiment offer another technical solution: a kind of femtosecond pulse laser, including femtosecond seed source,
Pulse stretcher and Pulse Power Magnification structure further include above-mentioned pulse shortener, the femtosecond seed source, the pulse
Stretcher, the Pulse Power Magnification structure and the pulse shortener are successively laid along optical path direction of transfer.
Compared with prior art, the utility model has the beneficial effects that passing through the first reflection microscope group and the second reflection microscope group
Cooperate single diffraction grating that the effect of Compressed pulse width can be realized, not only overall structure is simple and compact, but also drops
Low laser cost.
Detailed description of the invention
Fig. 1 is the structural representation that a kind of pulse shortener provided by the embodiment of the utility model uses reflective diffraction gratings
Figure；
Fig. 2 is the structural representation that a kind of pulse shortener provided by the embodiment of the utility model uses transmissive diffraction grating
Figure；
In appended drawing reference: 10- reflective diffraction gratings；11- transmissive diffraction grating；The first reflecting mirror of 20-；21- second
Reflecting mirror；3- optical path is turned back section；40- diffraction side；41- transmissive side；50- the first light element mirror；The second light element of 51-
Mirror；52- third light element mirror；The 4th light element mirror of 53-；The 5th light element mirror of 54-；First point of 60-；61- second point；
λ1Incident light；λ2Emergent light.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
All other embodiment obtained, fall within the protection scope of the utility model.
Fig. 1 and 2 is please referred to, the utility model embodiment provides a kind of pulse shortener, including diffraction grating, the first reflection
21 groups of 20 groups of mirror and the second reflecting mirror, form light between 21 groups of the diffraction side 40 of the diffraction grating and second reflecting mirror
Road is turned back section 3, and the diffraction grating has for receiving incident light λ1Incidence point for the first time, for by the incident light λ1It leads
Eye point for the first time to 20 groups of first reflecting mirror, the secondary incidence for receiving first reflecting mirror, 20 groups of reflected lights
Point, for 20 groups of first reflecting mirror of reflected light to be directed at the secondary eye point of 21 groups of second reflecting mirror, is used to connect
Receive the last incidence point of the last reflected light path of 21 groups of second reflecting mirror and for by the optical path of last incidence point diffraction
The last eye point of output.In the present embodiment, existing double diffraction grating is changed to monochromatic light grid, and is aided with the first reflecting mirror 20
21 groups of group and the second reflecting mirror can be completed the light pulse that should be completed by existing double diffraction grating and compress.Specifically, incident
Light λ1It is mapped at the incidence point for the first time of diffraction grating, is and then again gone out light emission to 20 groups of the first reflecting mirror by eye point for the first time
On, light is reflected again and is turned again at the secondary incidence point of diffraction grating by the first 20 groups of reflecting mirror, and then by it is secondary go out
Exit point again goes out light emission on 21 groups of the second reflecting mirror, the refraction that will be turned back in section 3 repeatedly in above-mentioned optical path at this time,
That is, optical path is gradually lifted at b1 by a1 in Fig. 1, finally pass through last eye point at b1 by optical output, at this time
Light can be blocked and can not be mapped to again on 21 groups of the second reflecting mirror by the first light element mirror 50, therefore will not be further continued for further
Ground is raised, and by as emergent light λ2Output, emergent light λ at this time2As squeezed light.It turns back in optical path and is reflected in section 3 repeatedly
For the prior art, specifically, incident light λ1It enters after diffraction grating and is broadened as linear light, turn back in section 3 in the optical path,
It is point light by multiple optical grating diffraction after-contraction, is finally emergent light λ by the output of last eye point2, this is because diffraction grating
Characteristic, when laser is incident on grating surface with special angle, since long wavelength is divided into and spreading out with shortwave long component in laser
Firing angle degree is different, and after first time diffraction, hot spot is linear by a broadening, and after multiple diffraction, final hot spot is again by line
It is punctured into a little and exports, in this course due to the separation of long wave long component and shortwave long component, different wave length ingredient is made to exist
The different light path of transmission, the dispersion introduced in preamble fiber pulse stretcher can be compensated in pulse shortener, Er Qietong
Cross the distance between reflection microscope group and diffraction grating, the size of adjustable compensation dispersion, when the two distance adjust to it is best when,
Output pulse pulsewidth can be compressed into it is most short, thus realize high-energy, high-peak power femtosecond pulse output.In
Optical path is turned back in section 3, be have passed through four times altogether and is turned back, that is, experienced four diffraction, therefore last incidence point and last outgoing
Point actually should be four incidence points and four eye points.
As the prioritization scheme of the utility model embodiment, referring to Fig. 1, the diffraction grating is reflective diffraction gratings
10, the incidence point for the first time, the eye point for the first time, the secondary incidence point, the secondary eye point, the last incidence point
And the last eye point is respectively positioned on the diffraction side 40 of the reflective diffraction gratings 10.In the present embodiment, work as diffraction light
It is the incidence point for the first time, the eye point for the first time, the secondary incidence point, described when grid are selected as reflective diffraction gratings 10
This six points of secondary eye point, the last incidence point and the last eye point are respectively positioned on diffraction side 40, wherein enter for the first time
Exit point, for the first time eye point, last incidence point and last eye point are at b1, and secondary incidence point and secondary eye point are at a1.
Above scheme is advanced optimized, referring to Fig. 1, this pulse shortener further includes for by the incident light λ1It is directed at
Reflective diffraction gratings 10 and by emergent light λ2First light element mirror 50 of reflective diffraction gratings 10 described in diversion, institute
The first light element mirror 50 is stated close to the diffraction side 40 of the reflective diffraction gratings 10, the first light element mirror 50 is installed
On the first adjustable microscope base.In the present embodiment, by the angle of the first adjustable adjustable first light element mirror 50 of microscope base,
In order to by incident light λ1It is directed in reflective diffraction gratings 10 and by emergent light λ2Diversion reflective diffraction gratings 10 are led to
Crossing first light element can make overall structure more compact, and not have to again by incident light λ1Incident angle limitation, only need
The tilt angle of the first light element is adjusted by the first adjustable microscope base.
Above scheme is advanced optimized, referring to Fig. 1, this pulse shortener further includes for by derived from emergent light second
Light element mirror 51, the light guiding surface of the first light element mirror 50 described in the light guiding surface face of the second light element mirror 51.In
In the present embodiment, in order to further optimize the placement position between each device, in the base for having set the first light element mirror 50
This second light element mirror 51, incident light λ are set on plinth again1It can be passed through from the second guide-lighting mirror, reflected light second is led by this again
The light guiding surface of light microscopic is output to outside chamber.Preferably, 1030nm is coated on the first above-mentioned guide-lighting mirror and the second guide-lighting mirror
High-reflecting film.
As the prioritization scheme of the utility model embodiment, referring to Fig. 2, the diffraction grating is transmissive diffraction grating
11, the incidence point for the first time, the secondary eye point, the last incidence point and the last eye point are respectively positioned on described
The diffraction side 40 of formula diffraction grating 11 is penetrated, the eye point for the first time and the secondary incidence point are respectively positioned on the transmissive diffraction
The transmissive side 41 of grating 11.In the present embodiment, used diffraction grating be transmissive diffraction grating 11, due to its with it is above-mentioned
Reflective gratings property difference, therefore it is the incidence point for the first time, the eye point for the first time, the secondary incidence point, described
The arrangement of secondary eye point, the last incidence point and the last eye point is not like reflective gratings.And in the present embodiment
In, when being not optimised out third light element mirror 52, the position of the second 21 groups of reflecting mirror be can in Fig. 2 third light element
The position of mirror 52, but regardless of its position where, as long as can will from eye point for the first time come out light return again to transmission
Formula diffraction grating 11.Wherein, for the first time incidence point, eye point, last incidence point and last eye point are respectively positioned on Fig. 2 for the first time
At middle b2, secondary incidence point and secondary eye point are located at the a2 in Fig. 2.In addition, optical path is turned back turning back in section 3 in optical path
As above-described embodiment, and it have passed through four times and turn back, is i.e. four optical grating diffractions, be gradually lifted at b2 from a2, then
It is exported, extra principle explanation just repeats no more.
Above scheme is advanced optimized, referring to Fig. 2, this pulse shortener further includes close to the transmissive diffraction grating
The third light element mirror 52 that 11 transmissive side 41 is installed, the guide-lighting side of the third light element mirror 52, which has, receives described two
Light that secondary outgoing fixed fire comes simultaneously is directed at the 1: 60 of 20 groups of first reflecting mirror, the third light element mirror 52
Guide-lighting side also has the light and the second point for being directed at the secondary incidence point for receiving that 20 groups of reflections of the first reflecting mirror come
61.In the present embodiment, if the purpose of this third light element mirror 52 is to cooperate the turnover of first 20 groups of completion optical paths of reflecting mirror,
Light is incident upon described 1: 60 after coming out from the eye point for the first time of transmissive diffraction grating 11, then reflexes to the first reflecting mirror 20
Then group is again turned back back light the second point 61 of third light element mirror 52, then thus second point 61 by 20 groups of the first reflecting mirror
It is reflected back the secondary incidence point of transmissive diffraction grating 11.
As the prioritization scheme of the utility model embodiment, referring to Fig. 2, this pulse shortener further includes for will be described
Incident light λ1It is directed at the transmissive diffraction grating 11 and by emergent light λ2The 4th of transmissive diffraction grating 11 described in diversion is guide-lighting
Unit mirror 53, the 4th light element mirror 53 are guide-lighting close to the diffraction side 40 of the transmissive diffraction grating 11, the described 4th
Unit mirror 53 is mounted on the second adjustable microscope base.In the present embodiment, the purpose of this 4th light element mirror 53 and above-mentioned implementation
The purpose of the first light element mirror 50 in example is identical, it can also adjust its tilt angle by the second adjustable microscope base, so as to
In incident light λ1Injection and emergent light λ2Export.Specific effect just repeats no more.
Above scheme is advanced optimized, referring to Fig. 2, this pulse shortener further includes for by emergent light λ2Derived
Five light element mirrors 54, the light guiding surface of the 4th light element mirror 53 described in the light guiding surface face of the 5th light element mirror 54.
In the present embodiment, the effect of the 5th light element mirror 54 is identical as the above-mentioned purpose of the second light element mirror 51, herein
Just repeat no more.
As the prioritization scheme of the utility model embodiment, referring to Fig. 2,20 groups of first reflecting mirror include symmetrically setting
Two piece of first reflecting mirror 20 set, the reflecting surface face setting of two piece of first reflecting mirror 20.In the present embodiment, two piece first it is anti-
It penetrates mirror 20 to be symmetrical arranged, light backtracking can be made, two optical paths are parallel to each other.In addition, 21 groups of the second reflecting mirror are one piece the
Two-mirror 21, the second reflecting mirror is close to the diffraction side of the diffraction grating.On first reflecting mirror 20 and the second reflecting mirror 21
It is coated with 1030nm high-reflecting film.
The utility model embodiment provides a kind of femtosecond pulse laser, including femtosecond seed source, pulse stretcher and
Pulse Power Magnification structure further includes above-mentioned pulse shortener, the femtosecond seed source, the pulse stretcher, the pulse
Power amplification structure and the pulse shortener are successively laid along optical path direction of transfer.Above-mentioned arteries and veins is used in the present embodiment
Compressor is rushed, the layout inside femtosecond pulse laser is greatly optimized, and reduces the production of femtosecond pulse laser
Cost.
While there has been shown and described that the embodiments of the present invention, for the ordinary skill in the art,
It is understood that these embodiments can be carried out with a variety of variations in the case where not departing from the principles of the present invention and spirit, repaired
Change, replacement and variant, the scope of the utility model is defined by the appended claims and the equivalents thereof.
Claims (10)
1. a kind of pulse shortener, it is characterised in that: including diffraction grating, the first reflection microscope group and the second reflection microscope group, institute
It states and forms optical path between the diffraction side of diffraction grating and the second reflection microscope group and turn back section,
The diffraction grating has incidence point for the first time for receiving incident light, anti-for the incident light to be directed at described first
It penetrates the eye point for the first time of microscope group, the secondary incidence point for receiving the first reflection microscope group reflected light, be used for described first
The reflected light of reflection microscope group is directed at the secondary eye point of the second reflection microscope group, the end for receiving the second reflection microscope group
The last incidence point of secondary reflection optical path and for by the last eye point of the optical output of last incidence point diffraction.
2. a kind of pulse shortener as described in claim 1, it is characterised in that: the diffraction grating is reflective diffraction light
Grid, the incidence point for the first time, the eye point for the first time, the secondary incidence point, the secondary eye point, the last incidence point
And the last eye point is respectively positioned on the diffraction side of the reflective diffraction gratings.
3. a kind of pulse shortener as claimed in claim 2, it is characterised in that: further include for the incident light to be directed at institute
Reflective diffraction gratings and the first light element mirror by reflective diffraction gratings described in emergent light diversion are stated, described first is guide-lighting
Unit mirror is mounted on the first adjustable microscope base close to the diffraction side of the reflective diffraction gratings, the first light element mirror.
4. a kind of pulse shortener as claimed in claim 3, it is characterised in that: further include for by derived from emergent light second
Light element mirror, the light guiding surface of the first light element mirror described in the light guiding surface face of the second light element mirror.
5. a kind of pulse shortener as described in claim 1, it is characterised in that: the diffraction grating is transmissive diffraction light
Grid, the incidence point for the first time, the secondary eye point, the last incidence point and the last eye point are respectively positioned on described
The diffraction side of formula diffraction grating is penetrated, the eye point for the first time and the secondary incidence point are respectively positioned on the transmissive diffraction grating
Transmissive side.
6. a kind of pulse shortener as claimed in claim 5, it is characterised in that: further include close to the transmissive diffraction grating
The third light element mirror installed of transmissive side, the guide-lighting side of the third light element mirror, which has, receives the secondary eye point
It penetrates the light come and is directed at the described first first point for reflecting microscope group, the guide-lighting side of the third light element mirror, which also has, to be connect
Receive the light that the first reflection microscope group reflection comes and the second point for being directed at the secondary incidence point.
7. a kind of pulse shortener as claimed in claim 5, it is characterised in that: further include for the incident light to be directed at institute
It states transmissive diffraction grating and by the 4th light element mirror of transmissive diffraction grating described in emergent light diversion, the described 4th is guide-lighting
Unit mirror is mounted on the second adjustable microscope base close to transmissive diffraction grating diffration side, the 4th light element mirror.
8. a kind of pulse shortener as claimed in claim 7, it is characterised in that: further include for by the derived from emergent light the 5th
Light element mirror, the light guiding surface of the 4th light element mirror described in the light guiding surface face of the 5th light element mirror.
9. a kind of pulse shortener as described in claim 1, it is characterised in that: the first reflection microscope group includes being symmetrical arranged
Two piece of first reflecting mirror, the reflecting surface face setting of two piece of first reflecting mirror.
10. a kind of femtosecond pulse laser, including femtosecond seed source, pulse stretcher and Pulse Power Magnification structure, special
Sign is: further include the pulse shortener as described in claim 1-9 is any, the femtosecond seed source, the pulse stretcher,
The Pulse Power Magnification structure and the pulse shortener are successively laid along optical path direction of transfer.
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| CN201920398416.1U CN209561848U (en) | 2019-03-27 | 2019-03-27 | Pulse shortener and femtosecond pulse laser |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| KR20220058398A (en) * | 2020-10-30 | 2022-05-09 | 한국전자통신연구원 | two-photon excited fluorescence microscopy for diagnosis of dementia and Mild Cognitive Impairment (MCI), and pulse compressor included therein |
| US11921273B2 (en) | 2020-10-30 | 2024-03-05 | Electronics And Telecommunications Research Institute | Two-photon excited fluorescence microscope for diagnosis of Alzheimer's disease (AD) and mild cognitive impairment (MCI), and pulse compressor including therein |
-
2019
- 2019-03-27 CN CN201920398416.1U patent/CN209561848U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20220058398A (en) * | 2020-10-30 | 2022-05-09 | 한국전자통신연구원 | two-photon excited fluorescence microscopy for diagnosis of dementia and Mild Cognitive Impairment (MCI), and pulse compressor included therein |
| KR102572214B1 (en) * | 2020-10-30 | 2023-08-30 | 한국전자통신연구원 | two-photon excited fluorescence microscopy for diagnosis of dementia and Mild Cognitive Impairment (MCI), and pulse compressor included therein |
| US11921273B2 (en) | 2020-10-30 | 2024-03-05 | Electronics And Telecommunications Research Institute | Two-photon excited fluorescence microscope for diagnosis of Alzheimer's disease (AD) and mild cognitive impairment (MCI), and pulse compressor including therein |
| 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 |
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Address after: 1903 robins lane, Holt, MI, USA Patentee after: Liu Zhenlin Address before: 1903 robins lane, Holt, MI Patentee before: Liu Zhenlin |
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Effective date of registration: 20200713 Address after: 1st floor, No.1 Workshop, Science Park, Huazhong University of science and technology, Donghu New Technology Development Zone, Wuhan City, Hubei Province Patentee after: WUHAN HUARUI ULTRA-FAST FIBER LASER TECHNOLOGY Co.,Ltd. Address before: 1903 robins lane, Holt, MI, USA Patentee before: Liu Zhenlin |