CN208637786U - Femto-second laser pulse frequency spectrum shaping device - Google Patents
Femto-second laser pulse frequency spectrum shaping device Download PDFInfo
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- CN208637786U CN208637786U CN201821468556.3U CN201821468556U CN208637786U CN 208637786 U CN208637786 U CN 208637786U CN 201821468556 U CN201821468556 U CN 201821468556U CN 208637786 U CN208637786 U CN 208637786U
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Abstract
The utility model provides a kind of femto-second laser pulse frequency spectrum shaping device, is related to laser pulse amplifying technique field, which includes beam splitting element, the first reflecting element, the second reflecting element and receiving element；First reflecting element and/or second reflecting element can be adjusted with the distance between the beam splitting element in real time respectively, so adjust respectively by first reflecting element, second reflecting element light beam between optical path difference；Femto-second laser pulse to shaping being capable of beam splitting through the beam splitting element, so that a part of reflected light beam reflexes to the receiving element through first reflecting element, the light beam that another part is transmitted reflexes to the receiving element through second reflecting element, solely can only change the technical problems such as optical path difference by changing medium refraction index in the prior art to alleviate.
Description
Technical field
The utility model relates to laser pulse amplifying technique fields more particularly to a kind of femto-second laser pulse frequency spectrum shaping to fill
It sets.
Background technique
Chirped pulse amplification (Chirped Pulse Amplification, CPA) technology has become to be surpassed on the current time
The main means that pulse energy is amplified in short laser pulse system.Its implementation is: femtosecond or picosecond pulse first being introduced one
Fixed dispersion, pulse width is broadened in the time domain to picosecond even nanosecond order, a formation chirped laser pulse reduces peak value
Power.Then make chirped laser pulse by neodymium glass or the main amplification system of Ti:Sapphire laser, carry out the amplification of energy, thus reduce
The risk of element damage.Finally, after waiting the higher energy of acquisition, then dispersion is compensated, pulse width is compressed to femtosecond amount
Grade.CPA technology is that the development of ultrashort laser pulse brings revolutionary variation, in the world table top of many laboratories in very little
On all obtain peak power be terawatt (TW) (TW, 1012W), clap watt (PW, 1015W) the laser output of magnitude.
Although being easier to obtain superhigh intensity ultrashort laser pulse using CPA technology, it still has some lack
Point such as, along with stronger amplified spontaneous emission (ASE), is influencing the contrast of compression afterpulse in amplification process；Secondly,
Gain media used in CPA amplification system is long, the limited caused fuel factor of Energy extraction is serious, is also easy to produce self-focusing and puts
The defects such as single-pass gain is low during big；In addition, very important, spectrum gain narrowing, gain saturatiuon in amplification process
Benefit Transfer is obvious, and original width is not achieved in the pulse after influencing recompression.Therefore, come from whole ultrashort laser pulse system
It sees, carrying out shaping to the frequency spectrum of laser pulse before chirped laser pulse enters neodymium glass or the main amplification system of Ti:Sapphire laser becomes
It is necessary to.The spectrum width of pulse is set to become larger or be distributed in intermediate recess to compensate neodymium glass or Ti:Sapphire laser etc. by shaping
Gain-narrowing effect in gain media amplification process is beneficial to pulsewidth shorter after supporting to compress.However in current ground skill
It is all to change optical path difference by solely changing the refractive index of medium, and then realize laser pulse mostly in art and product
Frequency spectrum shaping.
Utility model content
The first of the utility model is designed to provide a kind of femto-second laser pulse frequency spectrum shaping device, to alleviate existing skill
Only solely change the technical problems such as optical path difference by changing medium refraction index in art.
To achieve the goals above, the utility model uses following technical scheme:
A kind of femto-second laser pulse frequency spectrum shaping device provided by the utility model, including beam splitting element, the first reflector
Part, the second reflecting element and receiving element；
First reflecting element and/or second reflecting element respectively can with the distance between the beam splitting element
It adjusts in real time, and then adjusts the optical path difference between the light beam for passing through first reflecting element, second reflecting element respectively；
Frequency spectrum after shaping femto-second laser pulse broadening after through the beam splitting element can beam splitting so that a part reflected
Light beam reflex to the receiving element through first reflecting element, the light beam that another part is transmitted is reflected through described second
Element reflexes to the receiving element.
Further, the femto-second laser pulse frequency spectrum shaping device further includes regulating element；
The regulating element is for adjusting first reflecting element and/or second reflecting element apart from the beam splitting
Length between element.
Further, the regulating element includes control power supply and piezoelectric ceramics；
The piezoelectric ceramics and first reflecting element and/or second reflecting element are affixed；
The control power supply is to the piezoelectric ceramics input electrical signal, to change the elongation of the piezoelectric ceramics.
Further, the femto-second laser pulse frequency spectrum shaping device further includes compensating element,；
Light beam through second reflecting element can reflex to the compensating element, be incident to institute through the compensating element,
State receiving element.
Further, the beam splitting element includes the first glass plate, and at least one light of first glass plate connects
Receipts face is provided with coating.
Further, first reflecting element and the orthogonal setting of the second reflecting element.
Further, first reflecting element and second reflecting element are all made of reflecting mirror.
The utility model has the following beneficial effects:
A kind of femto-second laser pulse frequency spectrum shaping device provided by the utility model, including beam splitting element, the first reflector
Part, the second reflecting element and receiving element；Beam splitting element is for the femto-second laser pulse to shaping to be split, the first reflection
Element and the second reflecting element can be used in reflecting femto-second laser pulse, have the function of changing radiation direction；Wherein, first
Reflecting element and/or the second reflecting element can be adjusted apart from the distance between beam splitting element size according to actual needs respectively
Section, so that generating optical path difference by the light beam of the first reflecting element, the second reflecting element respectively.
In actual use, constant relative to the distance between beam splitting element with the first reflecting element, the second reflecting element
It is amenable to example relative to the distance between beam splitting element, after the femto-second laser pulse of shaping first passes through stretcher broadening,
It is split using beam splitting element, a part of light beam reflexes to the first reflecting element by beam splitting element, then passes through first
Reflecting element is reflected back beam splitting element, then reaches receiving element transmitted through beam splitting element, forms the first light beam；Another part warp
Light beam after beam splitting element transmission is incident to the second reflecting element, and the light beam through the second reflecting element can be reflected onto point again
On beam element, receiving element is then reflexed to by beam splitting element, forms the second light beam；Meanwhile because the second reflecting element phase
The distance between beam splitting element can be changed, so that there are optical path differences between the second light beam and the first light beam；Moreover,
Second reflecting element is relative to the distance between beam splitting element real-time change, so the light between the first light beam and the second light beam
Path difference can also change in real time；So the first light beam and the second light beam that reach receiving element can interfere superposition, superposition
The intensity of femto-second laser pulse obtained can be carried out according to the difference of the optical path difference between the first light beam and the second light beam afterwards
Change, and then the transmissivity of each spectral component can be changed, to realize the shaping of femto-second laser pulse frequency spectrum.
Detailed description of the invention
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it is described below
In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art
Under the premise of labour, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the schematic diagram for the femto-second laser pulse frequency spectrum shaping device that embodiment one provides；
Fig. 2 is the schematic diagram for the multiple shaping of femto-second laser pulse frequency spectrum that embodiment one provides；
Fig. 3 is the spectral contrast figure after the femto-second laser pulse shaping that embodiment one provides.
Icon: 10- beam splitting element；The first reflecting element of 20-；The second reflecting element of 30-；40- piezoelectric ceramics；50- control
Power supply；60- compensating element,；70- stretcher；80- receiving element；100- femto-second laser pulse frequency spectrum shaping device；101- coating.
Specific embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with attached drawing, it is clear that described
Embodiment is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, originally
Field those of ordinary skill every other embodiment obtained without making creative work belongs to practical
Novel protected range.
In the description of the present invention, it should be noted that term " first ", " second " are used for description purposes only, and
It cannot be understood as indicating or implying relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
The concrete meaning of language in the present invention.
Embodiment one
As Figure 1-Figure 2, femto-second laser pulse frequency spectrum shaping device provided in this embodiment, including beam splitting element 10,
First reflecting element 20, the second reflecting element 30 and receiving element 80；First reflecting element 20 and/or the second reflecting element 30 divide
It can not adjusted in real time with the distance between beam splitting element 10, and then adjust and reflected respectively by the first reflecting element 20, second
Optical path difference between the light beam of element 30；To shaping femto-second laser pulse through beam splitting element 10 can beam splitting so that a part of
Reflected light beam reflexes to receiving element 80 through the first reflecting element 20, and the light beam that another part is transmitted is through the second reflector
Part 30 reflexes to receiving element 80.
Specifically, the femto-second laser pulse frequency spectrum shaping device includes that beam splitting element 10, the first reflecting element 20, second are anti-
Element 30 and receiving element 80 are penetrated, beam splitting element 10 has the function of for light beam being split, the first reflecting element 20 and second
Reflecting element 30 all has the effect of reflection light, and receiving element 80 is then for receiving light.
Wherein, the first reflecting element 20 and/or the second reflecting element 30 are big apart from the distance between beam splitting element 10 respectively
It is small to be adjusted according to actual needs and then anti-by the first reflecting element 20, the second reflecting element 30 respectively to change
Penetrate the optical path difference of rear light beam.
In actual use, such as the first reflecting element 20 is constant relative to the distance between beam splitting element 10, and second is anti-
Penetrating element 30 can change relative to the distance between beam splitting element 10；Femto-second laser pulse to shaping first passes through stretcher 70
Broadening is chirped laser pulse, and chirped laser pulse is split by beam splitting element 10, and a part of light beam is through excessive
Beam element 10 reflexes to the first reflecting element 20, is then reflected back beam splitting element 10 by the first reflecting element 20, then transmits
It crosses beam splitting element 10 and reaches receiving element 80, form the first light beam；Light beam of the another part after the transmission of beam splitting element 10 is incident
To the second reflecting element 30, the light beam through the second reflecting element 30 can be reflected onto again on beam splitting element 10, then pass through
Beam splitting element 10 reflexes to receiving element 80, forms the second light beam；Meanwhile because the second reflecting element 30 relative to beam splitting element
The distance between 10 can change, so that there are optical path differences between the second light beam and the first light beam；Moreover, the second reflector
Part 30 is real-time change relative to the distance between beam splitting element 10, so the optical path difference between the first light beam and the second light beam
Also can change in real time；So the first light beam and the second light beam that reach receiving element 80 can interfere superposition, it is superimposed institute
The intensity of the light beam of acquisition can be changed according to the difference of the optical path difference between the first light beam and the second light beam, and then can
Change the transmissivity of each spectral component, and is superimposed the chirped laser pulse after interference and is changed into after the processing of receiving element 80
Femto-second laser pulse, to realize the shaping of femto-second laser pulse frequency spectrum.
As shown in Fig. 2, needing the femto-second laser pulse of shaping can fill by above-mentioned femto-second laser pulse frequency spectrum shaping
The 100 multiple shapings of carry out are set, to obtain required frequency spectrum.
Wherein, the first reflecting element 20 and the second reflecting element 30 respectively can be same with respect to the distance between beam splitting element 10
Shi Jinhang is adjusted in real time.
Similar, the second reflecting element 30 is constant relative to the distance of beam splitting element 10, and the first reflecting element 20 is opposite
Change in real time in the distance of beam splitting element 10.
Wherein, receiving element 80 uses compressor, and compressor makes for compressing the chirped laser pulse after shaping
Chirped laser pulse boil down to femto-second laser pulse is obtained, to obtain the femto-second laser pulse of actually required spectrum distribution.
As shown in figure 3, wherein abscissa is wavelength, ordinate is relative intensity, and the figure of label A, which represents, to need to carry out frequency
The frequency spectrum profile of the femto-second laser pulse of shaping is composed, the figure of label B represents the frequency spectrum profile for completing frequency spectrum shaping.
In the optional scheme of the present embodiment, as Figure 1-Figure 2, femto-second laser pulse frequency spectrum shaping device further includes adjusting
Save element；Regulating element is for adjusting the first reflecting element 20 and/or the second reflecting element 30 between beam splitting element 10
Length.
Specifically, the femto-second laser pulse frequency spectrum shaping device further includes regulating element, regulating element can be with first instead
It penetrates element 20 and/or the second reflecting element 30 is affixed, and then to realize to the first reflecting element 20 and/or the second reflecting element 30
It is respectively relative to the adjusting between beam splitting element 10 apart from size.
In actual use, regulating element includes control power supply 50 and piezoelectric ceramics 40；Piezoelectric ceramics 40 and the first reflection
Element 20 and/or the second reflecting element 30 are affixed；Power supply 50 is controlled to 40 input electrical signal of piezoelectric ceramics, to change piezoelectric ceramics
40 elongation.
Specifically, piezoelectric ceramics 40 is installed in the back side of the first reflecting element 20 and/or the second reflecting element 30, i.e., do not connect
Receive the side of light；Starting control power supply 50, control power supply 50 export electric signal to piezoelectric ceramics 40, that is, are applied to piezoelectric ceramics
The size of voltage on 40 can change in real time, and then adjust the elongation of piezoelectric ceramics 40, the elongation energy of piezoelectric ceramics 40
The variation of the first reflecting element 20,30 position of the second reflecting element is enough driven, and then is realized anti-to the first reflecting element 20, second
Element 30 is penetrated relative to the adjusting between beam splitting element 10 apart from size.
In the optional scheme of the present embodiment, as Figure 1-Figure 2, femto-second laser pulse frequency spectrum shaping device further includes mending
Repay element 60；Light beam through the second reflecting element 30 can reflex to compensating element, 60, and compensated element 60 is incident to reception member
Part 80.
Specifically, the femto-second laser pulse frequency spectrum shaping device further includes compensating element, 60, the compensating element, 60 setting exists
Between second reflecting element 30 and beam splitting element 10, and then the light path of light beam associated with the second reflecting element 30 is increased,
Light i.e. for the first time after the transmission of beam splitting element 10 is transmitted through the second reflecting element 30 by compensating element, 60, by second
Reflecting element 30 is again introduced into the transmission of compensating element, 60 after reflecting, can just be incident to beam splitting element 10 then with reflection, Jin Erzeng
Add light beam to enter the number of optical element, i.e., has been that three times, the first reflecting element 20 is anti-with passing through into the number of optical element
The light beam penetrated is identical by the number of optical element.
Wherein, compensating element, 60 uses the second glass plate, and the second glass plate is arranged in parallel with the first glass plate, its own
Thickness it is also identical.
In the optional scheme of the present embodiment, as Figure 1-Figure 2, beam splitting element 10 includes the first glass plate, and first
At least one light receiving surface of glass plate is provided with coating 101.
Specifically, beam splitting element 10 includes the first glass plate, and at least one light receiving surface is set on the first glass plate
Coating 101 is set, and then realizes the semi-transparent semi-reflecting function of the first glass plate, realizes the beam splitting to the femto-second laser pulse after broadening.
Wherein, coating 101 is set in the light receiving surface of the first glass plate back side, and the coating 101 can be towards second
Reflecting element 30.
In general, coating 101 uses silvering, semi-transparent semi-reflecting film is formed in the first glass plate by coating 101.
In the optional scheme of the present embodiment, as Figure 1-Figure 2, the first reflecting element 20 and the second reflecting element 30 are mutually
Perpendicular setting.
Wherein, the first reflecting element 20 and the second reflecting element 30 are all made of reflecting mirror.
Specifically, the first reflecting element 20 is horizontally disposed, the second reflecting element 30 is vertically arranged, so that passing through respectively
The light beam of first reflecting element 20 and the second reflecting element 30 can be along backtracking, i.e. incident beam and the reflected beams angle
It is 0 degree.
Wherein, the first reflecting element 20 is the first reflecting mirror, and the second reflecting element 30 is the second reflecting mirror.
In summary, the femtosecond laser frequency spectrum shaping device is as follows in actual use:
It is fixed with the first reflecting mirror, for the second reflecting mirror is mobile:
Control power supply 50 is opened, so that voltage of the control load of power supply 50 on piezoelectric ceramics 40 changes in real time, Jin Ertong
The elongation of control piezoelectric ceramics 40 is crossed to control the size of distance between the first reflecting mirror and beam splitting element 10；It is sent out by laser
The femto-second laser pulse of emitter transmitting forms chirped laser pulse by the broadening of stretcher 70, and chirped laser pulse is reached
Beam splitting element 10, by 10 beam splitting of beam splitting element, a part of light beam reflexes to the first reflecting mirror by beam splitting element 10, then passes through
It crosses the first reflecting mirror and is reflected back beam splitting element 10, then reach receiving element 80 transmitted through beam splitting element 10, form the first light beam；
Light beam of the another part after the transmission of beam splitting element 10 is incident to compensating element, 60, and compensated element 60 is incident to second after transmiting
Reflecting mirror, backtracking is incident to after the transmission of the second glass plate again to compensating element, 60 after the reflection of the second reflecting mirror
Beam splitting element 10 reflexes to receiving element 80 by beam splitting element 10, forms the second light beam；Meanwhile because the second reflecting mirror phase
The distance between beam splitting element 10 can be changed, so that there are optical path differences between the second light beam and the first light beam；And
And second reflecting mirror relative to the distance between beam splitting element 10 when real-time change, so the first light beam and the second light beam it
Between optical path difference can also change in real time；So the first light beam and the second light beam that reach receiving element 80 can interfere
Superposition, the intensity of light beam obtained can be carried out according to the difference of the optical path difference between the first light beam and the second light beam after superposition
Change, and then the transmissivity of each spectral component can be changed, and the light beam after shaping returns femtosecond by compressor compresses
Laser pulse, to realize the shaping of femto-second laser pulse frequency spectrum.
Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should
Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of
Technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new
The range of each embodiment technical solution of type.
Claims (7)
1. a kind of femto-second laser pulse frequency spectrum shaping device, which is characterized in that including beam splitting element, the first reflecting element, second
Reflecting element and receiving element；
First reflecting element and/or second reflecting element respectively can be real-time with the distance between the beam splitting element
It adjusts, and then adjusts the optical path difference between the light beam for passing through first reflecting element, second reflecting element respectively；
Frequency spectrum wait for the femto-second laser pulse of shaping through the beam splitting element can beam splitting so that a part of reflected light beam is through institute
It states the first reflecting element and reflexes to the receiving element, the light beam that another part is transmitted is reflexed to through second reflecting element
The receiving element.
2. femto-second laser pulse frequency spectrum shaping device according to claim 1, which is characterized in that the femto-second laser pulse
Frequency spectrum shaping device further includes regulating element；
The regulating element is for adjusting first reflecting element and/or second reflecting element apart from the beam splitting element
Between length.
3. femto-second laser pulse frequency spectrum shaping device according to claim 2, which is characterized in that the regulating element includes
Control power supply and piezoelectric ceramics；
The piezoelectric ceramics and first reflecting element and/or second reflecting element are affixed；
The control power supply is to the piezoelectric ceramics input electrical signal, to change the elongation of the piezoelectric ceramics.
4. femto-second laser pulse frequency spectrum shaping device according to claim 1-3, which is characterized in that the femtosecond
Laser pulse frequency spectrum shaping device further includes compensating element,；
Light beam through second reflecting element can reflex to the compensating element, be incident to described connect through the compensating element,
Receive element.
5. femto-second laser pulse frequency spectrum shaping device according to claim 4, which is characterized in that the beam splitting element includes
First glass plate, and at least one light receiving surface of first glass plate is provided with coating.
6. femto-second laser pulse frequency spectrum shaping device according to claim 5, which is characterized in that first reflecting element
With the orthogonal setting of the second reflecting element.
7. femto-second laser pulse frequency spectrum shaping device according to claim 5, which is characterized in that first reflecting element
Reflecting mirror is all made of with second reflecting element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821468556.3U CN208637786U (en) | 2018-09-07 | 2018-09-07 | Femto-second laser pulse frequency spectrum shaping device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821468556.3U CN208637786U (en) | 2018-09-07 | 2018-09-07 | Femto-second laser pulse frequency spectrum shaping device |
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| CN208637786U true CN208637786U (en) | 2019-03-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108899745A (en) * | 2018-09-07 | 2018-11-27 | 成都师范学院 | Femto-second laser pulse frequency spectrum shaping device and its application method |
| CN112130336A (en) * | 2020-09-27 | 2020-12-25 | 欧菲微电子技术有限公司 | Optical assembly, 3D sensing assembly and electronic equipment |
-
2018
- 2018-09-07 CN CN201821468556.3U patent/CN208637786U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108899745A (en) * | 2018-09-07 | 2018-11-27 | 成都师范学院 | Femto-second laser pulse frequency spectrum shaping device and its application method |
| CN112130336A (en) * | 2020-09-27 | 2020-12-25 | 欧菲微电子技术有限公司 | Optical assembly, 3D sensing assembly and electronic equipment |
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