CN109407354B - A kind of tunable pulse broadening device of transmission-type monochromatic light grid multi-pass - Google Patents
A kind of tunable pulse broadening device of transmission-type monochromatic light grid multi-pass Download PDFInfo
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- CN109407354B CN109407354B CN201811418531.7A CN201811418531A CN109407354B CN 109407354 B CN109407354 B CN 109407354B CN 201811418531 A CN201811418531 A CN 201811418531A CN 109407354 B CN109407354 B CN 109407354B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/03—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
- G02F1/0305—Constructional arrangements
- G02F1/0311—Structural association of optical elements, e.g. lenses, polarizers, phase plates, with the crystal
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
- G02F1/095—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect in an optical waveguide structure
- G02F1/0955—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect in an optical waveguide structure used as non-reciprocal devices, e.g. optical isolators, circulators
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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- Ceramic Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Power Engineering (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Lasers (AREA)
Abstract
The invention discloses a kind of tunable pulse broadening devices of transmission-type monochromatic light grid multi-pass.The device includes cabinet, side plate and is located in the box body half wave plate, 0 ° of total reflective mirror, optoisolator, optoelectronic switch, Glan prism, four-way transmission-type single optical grating expending unit.Using the transmission grating of single 95% diffraction efficiency and the eyeglass of high reflectance, the energy loss under multi-pass is reduced, it is ensured that repeatedly Strength Changes are small after grating for laser pulse.By adjusting number of run of the working time control laser pulse of optoelectronic switch in the device, adjust the number that laser pulse passes through grating, realize the tunable output of pulse stretcher, improve the utilization rate of grating, reduce the cost of stretcher, can be achieved to broaden femtosecond pulse in the case where space occupies compact to picosecond or nanosecond pulse, amplification and acquisition for intensity laser pulse provide a compact economy and practical device.
Description
Technical field
The invention belongs to laser technology fields, more particularly, are related to a kind of tunable pulse of transmission-type monochromatic light grid multi-pass
Broaden device.
Background technique
Ultrashort ultrafast laser is widely applied in the processing to a variety of materials, such as accurately cutting, drilling and burning
Erosion etc., material includes metal, semiconductor, ceramics and glass and organic material, and can process glass from three-dimensional perspective
The inner transparent materials such as glass.At this stage maturation apply medical stent, repairing photomask plate, drilling inkjet nozzle and
Delineate the business applications such as solar battery.Since ultrashort ultrafast laser possesses bigger electromagnetic field, especially big energy Gao Gong
The ultrashort ultrafast laser light source of rate, scientific research personnel have been devoted to study the interaction between ultrashort intense light pulse and substance.
What the big high-power ultrashort ultrafast laser light source of energy generallyd use at present is chirp amplification amplification (CAP) amplification skill
Art, i.e., carry out pulse broadening to ultrashort ultrafast pulse, and reduced pulse peak power effectively avoids in laser amplification procedure
Damage of the high-peak power to device preferably obtains high power intensity laser pulse output, finally through pulse shortener,
Pulse is compressed, the peak power of pulse is improved, enhances the intensity of light pulse.Grating is easy to adjust since structure is simple,
It is widely used in the broadening and compression process of ultrashort ultrafast pulse amplification.Zhang Wei, Teng Hao et al. are at " Acta Physica Sinica "
It is based on grating to femtosecond employed in " 18mJ, 100Hz the femtosecond titanium precious stone laser amplifier " of periodical 2016 reports
The broadening of pulse is amplified pulse energy 2.5nj being amplified to 25.4mj, pulse energy improves 10 to 200ps7Times, simultaneously
Pulsewidth 37.8fs is obtained through grating compression, the peak power of pulse energy 18.3mJ, pulse are up to 0.48TW.However, in text
Grating pulse is only passed through 2 times, so that grating effectively cannot be utilized adequately, increases the device of entire laser system
Cost.Patent of invention 201210357163.6ZL " Single-grating multi-pass pulse widening device ", it is desirable that incident light be incident light be water
Flat polarised light realizes the control to laser pulse stretching multiple, laser pulse four by number control unit on four-way monochromatic light grid
It is secondary by monochromatic light grid, the pulsewidth after broadening is restricted.
Summary of the invention
In order to solve prior art problem, the present invention provides a kind of tunable pulse broadening dresses of transmission-type monochromatic light grid multi-pass
It sets, laser pulse repeatedly passes through grating, and the abundant broadening and pulse-width tunable output of laser pulse, knot are realized under monochromatic light grid
Structure is compact, small in size.
The technical solution is as follows:
A kind of tunable pulse broadening device of transmission-type monochromatic light grid multi-pass, including cabinet, side plate and be located at the cabinet in
Optical module, the cabinet upper left side plate be equipped with laser pulse entry port, right side plate be equipped with laser pulse exit ports.
Laser pulse is penetrated through the half wave plate from the laser pulse entry port of the cabinet upper left side plate and is successively passed through
The optoisolator, the general gram of box electrooptical switching, the Glan prism to the four-way transmission-type monochromatic light grid exhibition
Wide unit, then backtracking successively pass through the Glan prism, the general gram of box electrooptical switching, the optoisolator extremely
The one 0 ° of total reflective mirror.Through the one 0 ° of total reflective mirror reflected laser pulse backtracking again, recycled repeatedly with this.It is logical
The general gram of box electrooptical switching control loop number is crossed, finally through the Glan prism, from the right side of the cabinet
Laser pulse after the output broadening of plate laser pulse exit ports.
The half wave plate, thus it is possible to vary the polarization state of laser pulse meets the optoisolator to incidence
The polarization state requirement of laser pulse.
The general gram of box electrooptical switching can be KDP, one kind of the correlation electro-optic crystal such as KD*P, BBO, having a size of full
The size requirements of the hot spot of sufficient laser pulse incidence and outgoing.When laser pulse incidence, the general gram of box electrooptical switching work
Make, the polarization state of laser pulse changes, and is incident to the four-way four-way transmission-type single optical grating expending unit；But after broadening
When laser pulse is emitted, the general gram of box electrooptical switching stops working, and laser pulse penetrates the Glan prism.
The optoisolator both ends are respectively arranged with polarizing film, and the light of a polarization state penetrates polarizing film, another polarization
The polarised light of state then reflects from polarizing film.
The four-way transmission-type single optical grating expending unit is made of grating, recessed anti-mirror, 0 ° of total reflective mirror etc..Laser pulse is saturating
It crosses after the grating sequentially into the recessed anti-mirror, the 2nd 0 ° of total reflective mirror, is reflected by the 2nd 0 ° of total reflective mirror
To the recessed anti-mirror, through the grating to the 3rd 0 ° of total reflective mirror, it is anti-by the 3rd 0 ° of total reflective mirror original road
Return is penetrated, is finally completely coincident from the optical path of laser pulse and laser pulse when incidence after the grating outgoing broadening,
Contrary transmission, laser pulse pass through the grating totally 4 times.
The angle of laser pulse optical path and the grating after the Glan prism reflection is 90 ° and subtracts the grating
Littrow angle.
The Littrow angle of the grating is that the incidence angle of the incident grating is equal to the incidence angle at the grating diffration angle
Or the angle of diffraction, meet:
Wherein d is the constant of the grating, and φ is incidence angle or the angle of diffraction, and m is diffraction limit, and λ is incident pulse
Wavelength.
The grating is through mode grating, the grating long side top clamp face and gratings strips at a distance of 3~5mm.
The recessed anti-mirror is equal to the focal length of the recessed anti-mirror to the distance of the 3rd 0 ° of total reflective mirror.
The 2nd 0 ° of total reflective mirror and the 3rd 0 ° of total reflective mirror are the rectangular mirror of strip.
It is the one 0 ° of total reflective mirror, the 2nd 0 ° of total reflective mirror, the 3rd 0 ° of total reflective mirror, described recessed anti-
Mirror, 45 ° of reflecting mirrors are installed in pitching, on the adjustable mirror holder in left and right, and lens dimension is greater than the multi-pass of the monochromatic light grid
Broaden the hot spot in device optical path.
The Glan prism is square, and incident pulse and reflected impulse angle are 90 °, or other deielectric-coating
Polarizing film.
The half wave plate, the optoisolator, the general gram of box electrooptical switching, the Glan rib
Mirror, the grating, the recessed anti-mirror, the one 0 ° of total reflective mirror, the 2nd 0 ° of total reflective mirror and the third
0 ° of total reflective mirror high transmittance film or reflectance coating consistent with incident light wave band.
Technical solution provided by the invention has the benefit that
The present invention provide it is a kind of laser pulse is carried out to multipass and broadening on the same through mode grating, and pass through
General gram of box electrooptical switching carries out number tuning, realizes the tunable broadening of laser pulse on monochromatic light grid.It can be by femtosecond pulse
Broaden nanosecond order.
The present invention uses half wave plate, and rotation changes the polarization state of incident laser, guarantees that the pulse of each polarization state swashs
Light can be incident.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is box house light path design figure；
Fig. 2 is the left plate figure of cabinet；
Fig. 3 is the right side plate figure of cabinet；
Fig. 4 is the schematic diagram of general gram of box electrooptical switching working sequence and laser pulse stretching number；
In figure:
1- half wave plate；2- optoisolator；General gram of box electrooptical switching of 3-；4- Glan prism；The one 0 ° of total reflective mirror of 5-；
6- four-way transmission-type single optical grating expending unit；The 2nd 0 ° of total reflective mirror of 61-；The 3rd 0 ° of total reflective mirror of 62-；63- grating；The recessed anti-mirror of 64-；
7- pulse entry port, 8- pulse exit ports.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Fig. 1 is that box house light path design figure is shown with the size of part practical devices, and Fig. 2 is the left plate of cabinet
Figure.Fig. 3 is the right side plate figure of cabinet.Fig. 4 is the schematic diagram of general gram of box electrooptical switching working sequence and laser pulse stretching number.
The present invention provides a kind of tunable pulse broadening devices of transmission-type monochromatic light grid multi-pass, including cabinet, side plate and position
In the intracorporal optical module of case.Cabinet upper left side plate is equipped with pulse entry port 7 and right side plate is equipped with pulse entry port 8, institute
The optical module stated include half wave plate 1, optoisolator 2, general gram of box electrooptical switching 3,4, the 1st ° of Glan prism be all-trans
Mirror 5 and four-way transmission-type single optical grating expending unit 6.The four-way transmission-type single optical grating expending unit 6 includes the 2nd 0 ° and is all-trans
61, the 3rd 0 ° of total reflective mirrors 62 of mirror, grating 63 and recessed anti-mirror 64.
Incorporated by reference to Fig. 1,2,3, laser pulse is through laser pulse from the laser pulse incidence end of the cabinet upper left side plate
Mouthfuls 7 through the half wave plate 1 through successively through the optoisolator 2, the general gram of box electrooptical switching 3, described
Glan prism 4 to the four-way transmission-type single optical grating expending unit 6, then backtracking successively pass through the Glan prism
4, the general gram of box electrooptical switching 3, the optoisolator 2 to the one 0 ° of total reflective mirror 5.It is complete through described the one 0 °
Anti- 5 reflected laser pulse of mirror backtracking again, is recycled repeatedly with this.Pass through general gram of box electrooptical switching 3 control loop time
Number, finally through the Glan prism 4 after the output broadening of the laser pulse exit ports 8 of the cabinet upper right side panel
Laser pulse.
Preferably, the general gram of box electrooptical switching 3 can be one kind of the related electro-optic crystal such as KDP, KD*P, BBO, and
Meet the spot size requirement of laser pulse incidence and outgoing.When laser pulse incidence, general gram of 3 work of box electrooptical switching
Make, the polarization state of laser pulse changes, and is incident to the four-way four-way transmission-type single optical grating expending unit 6；But it broadens
When laser pulse is emitted afterwards, the general gram of box electrooptical switching 3 stops working, and laser pulse penetrates the Glan prism 4.
Preferably, 2 both ends of optoisolator are respectively arranged with polarizing film, and the light of a polarization state penetrates polarizing film, in addition
The polarised light of one polarization state then reflects from polarizing film.
Preferably, the four-way transmission-type single optical grating expending unit 6 is by the 2nd 0 ° of total reflective mirror 61, described
30 ° of total reflective mirrors 62, the grating 63 and the recessed anti-mirror 64 form.Laser pulse penetrate the grating 63 after successively
To the recessed anti-mirror 64, the 2nd 0 ° of total reflective mirror 61, reflexed to by the 2nd 0 ° of total reflective mirror 61 described recessed anti-
Mirror 64, through the grating 63 to the 3rd 0 ° of total reflective mirror 62, returned by the former road reflection of the 3rd 0 ° of total reflective mirror 62
It returns, is finally emitted from the grating 63, the optical path of the laser pulse after broadening and laser pulse when incidence is completely coincident, side
It is transmitted to opposite, laser pulse passes through the grating totally 4 times.
Preferably, optical path of the laser pulse through the grating 63 to the recessed anti-mirror 64 is in the upper surface of described grating 63
Edge is, and then reflex to the 2nd 0 ° of total reflective mirror 61 through the recessed anti-mirror 64.
Preferably, laser pulse reflexes to the 2nd 0 ° of total reflective mirror 61 in the grating 63 through the recessed anti-mirror 64
Top.
Preferably, the 2nd 0 ° of total reflective mirror 61, the 3rd 0 ° of total reflective mirror 62 and the recessed anti-mirror 64 are side
Shape mirror.
Again incorporated by reference to Fig. 1,4.It is laser pulse described first in the working time of the general gram of box electrooptical switching 3
0 ° of total reflective mirror 5, the optoisolator 2, the general gram of box electrooptical switching 3, the Glan prism 4 and described four are penetrating
N times when a cycle of formula single optical grating expending unit 5 advanced is penetrated, then laser pulse is by the number of the grating
4 × n times.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of tunable pulse broadening device of transmission-type monochromatic light grid multi-pass, which is characterized in that including cabinet and be located in the box body
Half wave plate (1), optoisolator (2), general gram of box electrooptical switching (3), Glan prism (4), the one 0 ° of total reflective mirror (5), four
The laser pulse entry port (7) of the left plate of logical transmission-type single optical grating expending unit (6) and cabinet and the laser arteries and veins of right side plate
Rush exit ports (8)；Pulse laser is from the laser pulse entry port (7) of the left plate of the cabinet successively through described two
/ mono- wave plate (1), the optoisolator (2), the general gram of box electrooptical switching (3), the Glan prism (4), institute
The four-way transmission-type single optical grating expending unit (6) stated and the one 0 ° of total reflective mirror (5), by the general gram of box electrooptical switching
(3) number of the laser pulse by the four-way transmission-type single optical grating expending unit (6) is controlled, the laser pulse after broadening penetrates
The Glan prism (4), from laser pulse exit ports (8) output of the right side plate of the cabinet, wherein swash when described
When optical pulse strikes, general gram of box electrooptical switching (3) work, the polarization state of the laser pulse changes, is incident to
The four-way transmission-type single optical grating expending unit (6)；But when the laser pulse is emitted after broadening, the general gram of box electricity
Photoswitch (3) stops working, and the laser pulse penetrates the Glan prism (4).
2. the tunable pulse broadening device of transmission-type monochromatic light grid multi-pass according to claim 1, which is characterized in that described
Four-way transmission-type single optical grating expending unit (6) is by the 2nd 0 ° of total reflective mirror (61), the 3rd 0 ° of total reflective mirror (62), grating (63) and recessed anti-
Mirror (64) composition；The laser pulse penetrate the grating (63) after sequentially into the recessed anti-mirror (64), described second
0 ° of total reflective mirror (61) reflexes to the recessed anti-mirror (64), through the grating by the 2nd 0 ° of total reflective mirror (61)
(63) it to the 3rd 0 ° of total reflective mirror (62), is returned by the former road reflection of the 3rd 0 ° of total reflective mirror (62), finally from described
Grating (63) outgoing broadening after laser pulse, be completely coincident with the optical path of laser pulse when incidence, contrary transmission,
Laser pulse passes through the grating (63) totally 4 times.
3. the tunable pulse broadening device of transmission-type monochromatic light grid multi-pass according to claim 2, which is characterized in that described
The angle of laser pulse optical path and the grating (63) after Glan prism (4) reflection is 90 ° of benefits for subtracting the grating
Special sieve angle.
4. special according to the tunable pulse broadening device of transmission-type monochromatic light grid multi-pass described in any one of claim 2-3
Sign is, the grating (63) is through mode grating, the grating (63) long side top clamp face and gratings strips at a distance of 1~
5mm。
5. the tunable pulse broadening device of transmission-type monochromatic light grid multi-pass according to claim 2, which is characterized in that described
Recessed anti-mirror (64) is equal to the focal length of the recessed anti-mirror (64) to the distance of the 2nd 0 ° of total reflective mirror (61).
6. special according to the tunable pulse broadening device of transmission-type monochromatic light grid multi-pass described in any one of claim 2 and 5
Sign is that the 2nd 0 ° of total reflective mirror (61) is the rectangular mirror of strip with the 3rd 0 ° of total reflective mirror (62).
7. the tunable pulse broadening device of transmission-type monochromatic light grid multi-pass according to claim 1, which is characterized in that described
General gram of box electrooptical switching (3) is KDP, and KD*P, one kind of BBO electro-optic crystal, clear aperture is 1~5mm.
8. the tunable pulse broadening device of transmission-type monochromatic light grid multi-pass according to claim 2, which is characterized in that described
The working time of general gram of box electrooptical switching (3) is laser pulse in 0 ° of total reflective mirror (5), the optoisolator (2), institute
General gram of box electrooptical switching (3), the Glan prism (4) and described four-way transmission-type single optical grating expending unit (6) institute stated
N times when a cycle of traveling, wherein N is positive integer, and laser pulse is 4 × n times by the number of the grating.
9. the tunable pulse broadening device of transmission-type monochromatic light grid multi-pass, feature described in any one of claim 2 and 5 exist
In, the half wave plate (1), the optoisolator (2), the general gram of box electrooptical switching (3), the grating
(63) and the Glan prism (4) is coated with the high transmittance film consistent with incident light wave band；The one 0 ° of total reflective mirror (5),
The 2nd 0 ° of total reflective mirror (61) is coated with the high reflection consistent with incident light wave band with the 3rd 0 ° of total reflective mirror (62)
Film.
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| CN111142192B (en) * | 2019-12-26 | 2022-10-11 | 上海理工大学 | Method for realizing high-speed optical switch response and ultrahigh-speed optical modulation optical switch device |
| CN115275741A (en) * | 2022-07-22 | 2022-11-01 | 深圳技术大学 | Pulse stretching device, pulse stretching system and laser |
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| CN1870359A (en) * | 2006-04-12 | 2006-11-29 | 中国科学院上海光学精密机械研究所 | Laser pulse stretching and compressing device |
| CN102866557B (en) * | 2012-09-21 | 2015-10-28 | 北京工业大学 | The how logical pulse stretcher device of monochromatic light grid |
| CN104035205B (en) * | 2014-06-17 | 2016-09-14 | 天津理工大学 | A kind of high power pulse compressor based on the kagome optical fiber filling helium |
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