CN208028366U - A kind of femtosecond laser compression set based on heterojunction structure waveguide array - Google Patents
A kind of femtosecond laser compression set based on heterojunction structure waveguide array Download PDFInfo
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- CN208028366U CN208028366U CN201820267925.6U CN201820267925U CN208028366U CN 208028366 U CN208028366 U CN 208028366U CN 201820267925 U CN201820267925 U CN 201820267925U CN 208028366 U CN208028366 U CN 208028366U
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- heterojunction structure
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Abstract
The utility model discloses a kind of femtosecond laser compression sets based on heterojunction structure waveguide array, light pulse is propagated along two heterojunction structure waveguide array interfaces with different cycles, the array for selecting the single mode waveguide of different spacing and weak coupling parameter to form, it combines programmable phase element and phase compensation is carried out to light beam, to carry out frequency domain broadening and time domain data compression to the light pulse of input.Heterojunction structure waveguide array uses aluminum gallium arsenide waveguide array interface, and compression set includes heterojunction structure waveguide array, and the heterojunction structure waveguide array is the array formed with the single mode waveguide of different spacing and weak coupling parameter.Heterojunction structure waveguide array is passed through in the utility model light pulse, and power spectrum when output power spectrum is than with smooth waveguide element is uniform, and compression ratio is big, can obtain narrower femto-second laser pulse.
Description
Technical field
The utility model is related to ultrashort, super strong laser pulse compress techniques, and in particular to one kind being based on heterojunction structure waveguide battle array
The femtosecond laser compression set of row.
Background technology
Femtosecond laser technology is constantly developing, pulsewidth is shorter and shorter, the peak value of pulse with the progress of science and technology
Power is increasing.Femtosecond laser duration is extremely short, and only several to hundreds of femtoseconds, its Billy is electronically
The most short pulse obtained also wants thousands of times short；Femtosecond laser has very high instantaneous power, can reach hundred TW terawatts, than
At present energy production world general power it is taller go out hundreds of times；Femtosecond laser can focus on the space region also smaller than the diameter of hair
In domain, keep the intensity of electromagnetic field more taller to the active force of its ambient electron than atomic nucleus, and the extreme physics item of many of which
Part is to be not present on the earth, and be also impossible to other methods.Femtosecond laser physics, biology,
It is widely applied in the fields such as chemical controlled reaction, optical communication.Since femtosecond laser has quick and high-resolution characteristic,
It has it solely in the manufacture of disease early diagnosis, medical imaging and biological living detection, surgical and microminiature satellite
Special advantage and irreplaceable role.
Before amplification, stretcher broadens pulse to original 10 for ultrashort pulse3-104Times, the degree of broadening is by overcoming
Light beam determines the damage of optical element and non-linear caused impulse waveform distortion.Peak value strength reduction after pulse broadening,
Then amplifier is re-fed into be amplified.Pulse strength is greatly reduced at this time, thus can effectively amplify its energy without
Optical element is damaged, until damaging thresholding of its peak strength close to amplifier system.After the completion of amplification, spatially
Pulse is expanded to reduce its peak strength, it is in time that the original pulse of pulse compression and back is wide to be then fed into pulse shortener
Degree, and obtain the ultrashort laser pulse of very high peak power.The realization of traditional pulse compression passes through two processes：Light pulse is first
First in homogeneity (or single waveguide) optical element with non-linear and normal dispersion, time domain and frequency domain broadening are carried out, then
By anomalous dispersion elements in time domain data compression, such as a pair of of grating or prism (such as those are used in the solid-state laser of Ti:Sapphire laser
Device).However, during this method first, power spectrum acute variation with the variation of wavelength, this is unfavorable for pulse pressure
Contracting.
Utility model content
The purpose of this utility model is to provide a kind of femtosecond laser compression set based on heterojunction structure waveguide array, light
Heterojunction structure waveguide array is passed through in pulse, and power spectrum when output power spectrum is than with smooth waveguide element is uniform, and compression ratio is big, can
To obtain narrower femto-second laser pulse.
To achieve the above object, the technical solution of the utility model is：A kind of femtosecond based on heterojunction structure waveguide array
Laser compression method, by light pulse along two heterojunction structure waveguide array interfaces with different cycles in the compression method
Propagate, select the single mode waveguide of different spacing and weak coupling parameter form array, combination programmable phase element to light beam into
Row phase compensation, to carry out frequency domain broadening and time domain data compression to the light pulse of input.
A kind of femtosecond laser compression method based on heterojunction structure waveguide array as described above, the heterojunction structure waveguide
Array uses aluminum gallium arsenide waveguide array interface, light pulse to follow formula I at the n-th waveguide：
Wherein：UnFor light pulse power, P is the peak power of input, CnIt is linear between the n-th waveguide and n+1 waveguides
Stiffness of coupling, AeffIt is accumulated for the effective cross section of each waveguide, β2For group velocity dispersion, k0And n2For self-focusing Kerr media coefficient.
A kind of femtosecond laser compression method based on heterojunction structure waveguide array as described above, selects different space Ds1With
D2Single mode waveguide, the compressed output formula of light pulse power spectrum be II：
Wherein：| U (ω) | it is power spectrum, ω0Centered on frequency, φ (ω) be frequency spectrum phase, U21For light pulse power.
A kind of femtosecond laser compression method based on heterojunction structure waveguide array as described above, the light pulse power spectrum
Compression process using programmable phase grating carry out, programmable phase grating use LCD space light modulator or acousto-optic modulation
Device.
The utility model also provides a kind of femtosecond laser compression set based on heterojunction structure waveguide array, and the femtosecond swashs
Optical compression device includes pulsed laser light source, and the pulsed laser light source is connected with collimating element, and the compression set includes different
Matter structured waveguide array, the heterojunction structure waveguide array are to be formed with the single mode waveguide of different spacing and weak coupling parameter
Array.
A kind of femtosecond laser compression set based on heterojunction structure waveguide array as described above, the heterojunction structure waveguide
Array forms array interface by aluminum gallium arsenide waveguide.
A kind of femtosecond laser compression set based on heterojunction structure waveguide array as described above, the femtosecond laser compression
Device further includes pulse compression module, and the pulse compression module includes heterojunction structure waveguide array and programmable phase element,
The pulse compression module uses LCD space light modulator or acousto-optic modulator, and pulse compression module is for passing through heterojunction structure
Waveguide array compresses the light pulse of input, and the programmable phase element is established with the heterojunction structure waveguide array to be connected
Relationship is connect, programmable phase element is used to carry out phase compensation to the light pulse beam of input.
A kind of femtosecond laser compression set based on heterojunction structure waveguide array as described above, programmable phase element connect
It is connected to control terminal and laser output mirror.Programmable phase element is made of a kind of controllable deforming light belt array of electrostatic drive,
Programmable meaning refers to the programming Control by driving circuit, and light belt structure can be it is anticipated that require to send out to a certain extent
Change shape so that the equivalent features parameter of grating changes, to control the phase of light field light wave so that certain wave
Long light wave space phase redistributes as required, generates expected diffraction and interference energy distribution character, belongs to existing skill
Art.
The utility model compression method by by light pulse along two heterojunction structure waveguide arrays with different cycles
Interface is propagated, and the array that the single mode waveguide of different spacing and weak coupling parameter forms is selected to carry out time domain pressure to the light pulse of input
Contracting and frequency domain broadening.The utility model compression set is equipped with heterojunction structure waveguide array, and heterojunction structure waveguide array is with not
With the array of the single mode waveguide of spacing and weak coupling parameter composition.When the utility model output power spectrum ratio smooth waveguide element
Power spectrum it is uniform, compression ratio is big, can obtain narrower femto-second laser pulse.
Description of the drawings
Fig. 1 is heterojunction structure waveguide array schematic diagram；
Fig. 2 is that the output intensity of different peak powers is distributed contour map；
Fig. 3 is the output power spectrogram using the utility model method light pulse；
Fig. 4 is the utility model method and conventional compression method Contrast on effect schematic diagram；
Fig. 5 is the femtosecond laser compression set schematic diagram based on heterojunction structure waveguide array.
Specific implementation mode
The following examples illustrate the utility model, but is not intended to limit the scope of the present invention.
Referring to Fig. 1, Binding experiment room experimental data illustrates that specific embodiment of the present utility model further relates to principle.Light
Pulse is propagated along two aluminum gallium arsenide waveguide array interfaces with different cycles, and in 1.55 mum wavelength, they is normal
Dispersion about β2=+1.3ps2/ m, the array for selecting different spacing and the single mode waveguide of weak coupling to form.According to coupled-mode theoryThe differentiation (P represents the peak power of input) of mould field amplitude follows following equation at the n-th waveguide：
In above formula, β2It is group velocity dispersion, CnIt is the linear coupling intensity between the n-th waveguide and n+1 waveguides, Aluminum gallium arsenide
Self-focusing Kerr media coefficient k0=2 π/λ0And n2=2.47 × 10-13cm2/ W, in λ0When=1.55, Aluminum gallium arsenide's normal dispersion is β2
=+1.3ps2Accumulate A in the effective cross section of/m, each waveguideeffIt is 15 μm2, so effective nonlinear coefficient γ (=k0n2/
Aeff) it is about 6.6m-1W-1.Linear coupling coefficient Ci(i=1,2) according to different DiDepending on (i=1,2), selected in the present embodiment
D1=4 μm, D2=7 μm and C is set respectively1=728m-1And C2=520m-1。
Array length is taken as 1cm herein, and it is n=21 that 41 optical waveguides and center optical waveguide are shared in heterogeneous interface.This battle array
When being listed in z=0 | U21|2=1, it is assumed that light beam is hyperbolic secant pulse U21(t, z=0)=Sech (t) and half breadth is
1.76ps.The intensity distribution of output is as shown in Fig. 2, corresponding different input peak value, a in Fig. 2, and the corresponding peak value of b, c is
0.5kW, 0.75kW and 1.5kW.(0.5kW) is inputted for low-power, discrete diffraction and time dispersive codetermined waveguide it
Between light diffusion process and pulse propagation, light pulse is diffused into neighbouring waveguide.It is 0.75kW for center input peak energy,
The edge of a pulse of low energy is only diffused by the effect of discrete diffraction and time dispersive among waveguide, and with high-strength
The pulse center of degree is limited in central waveguide due to the competitive equilibrium by non-linear and discrete diffraction, as a result, output
Pulse intensity distribution forms H patterns.For the input pulse of peak value, effect energy guided wave and office of the light beam by strong nonlinearity
Limit forms the intensity distribution of a similar rectangle on waveguide array interface.It can be seen that, interface waveguide by when secondary color
It dissipates, discrete diffraction and nonlinear effect influence.
As shown in figure 3, the pulse in homogeneity element (or single waveguide) frequency range will be enlarged by, due to Self-phase modulation (Ke Er
Nonlinear effect), lead to strong power spectrum frequency modulation.In heterojunction structure waveguide array, the pulse at central waveguide interface, not only
By time dispersive and Kerr non-linear effects, also discrete diffraction, the different discrete diffraction in the both sides of especially central waveguide.Under
The power spectrum in face, output pulse corresponding to c in Fig. 2 parses.For exporting pulse, frequency spectrum can be expressed as：
Here | U (ω) |2It is power spectrum, ω0It is centre frequency, φ (ω) frequency spectrum phase can be with expansion in Taylor series, this
Sample φ (ω)=φ0+φ1(ω)·(ω-ω0)+(1/2)φ2(ω)·(ω-ω0)2+…,
φ1Lead to the transformation of time, φ2Frequency chirp is represented, remaining coefficient corresponds to higher order term.Scheme to correspond in Fig. 3, shown in solid-line curve a
Output pulse power spectrum corresponding diagram 2 in c, it can be seen that the bandwidth of power spectrum is by homogeneously broadening.
Referring to Fig. 4, usually, the realization of pulse compression passes through two processes：Light pulse is first with non-linear and just
Be broadened in time domain and frequency domain in homogeneity (or single waveguide) optical element of normal dispersion, then by anomalous dispersion elements when
Domain is compressed, such as a pair of of grating or prism (such as those are used in Ti:Sapphire laser solid-state laser).However, in this method first
In the process, power spectrum is very violent with wavelength change, this is unfavorable for pulse compression.If the impulse phase φ (ω) of power spectrum
To full remuneration, then the light pulse after its ideal compensation, the halfwidth of light pulse can be compressed to 43 femtoseconds.And in identical item
Under part (identical Kerr coefficients, normal dispersion and inceptive impulse), if we allow light pulse to pass through heterojunction structure waveguide array,
Uniformly very much (see Fig. 3) due to power spectrum when output power spectrum is than with smooth waveguide element, so as to obtain one more
Good compression ratio.After its phase is accurately compensated, narrower femto-second laser pulse can be obtained, in Fig. 4 shown in (b).?
In this case, the halfwidth of the duration of compressed pulse strength about 31fs.It can be by making in this compression process
It is realized with programmable phase element, such as commercially available LCD space light modulator (LC-SLM) or acousto-optic modulator (AOM).
It is obtained by experimental data, the behavior that light pulse is propagated on heterogeneous waveguide array interface is mainly by asymmetrical
Discrete diffraction, dispersion and Kerr is non-linear is determined.When peak power is sufficiently high, light beam energy guided wave and it is confined to waveguide array
On interface, while its power spectrum is wider, to which heterojunction structure waveguide array can preferably compress optics arteries and veins than uniform Kerr media
Punching.
As shown in figure 5, the utility model also provides a kind of femtosecond laser compression set based on heterojunction structure waveguide array,
The femtosecond laser compression set includes pulsed laser light source 1, and the pulsed laser light source 1 is connected with collimating element 2, the pressure
Compression apparatus includes heterojunction structure waveguide array 3, and the heterojunction structure waveguide array 3 is with different spacing and weak coupling parameter
The array of single mode waveguide composition.The heterojunction structure waveguide array 3 forms array interface by aluminum gallium arsenide waveguide.
In one embodiment of femtosecond laser compression set based on heterojunction structure waveguide array, the femtosecond laser compression
Device further includes pulse compression module, and the pulse compression module includes heterojunction structure waveguide array 3 and programmable phase element
4, the pulse compression module uses LCD space light modulator or acousto-optic modulator, and pulse compression module is for passing through hetero-junctions
Structure waveguide array 3 compresses the light pulse of input, the programmable phase element 4 and the heterojunction structure waveguide array 3
It establishes a connection, programmable phase element 4 is used to carry out phase compensation to the light pulse beam of input.
In one embodiment of femtosecond laser compression set based on heterojunction structure waveguide array, the programmable phase member
Part 4 is connected with control terminal 5 and laser output mirror 6.Programmable phase element 4 by a kind of electrostatic drive controllable deforming light belt
Array forms, and programmable meaning refers to the programming Control by driving circuit, and light belt structure can be it is anticipated that require one
To determine to deform in degree so that the equivalent features parameter of grating changes, to control the phase of light field light wave,
So that the light wave space phase of specific wavelength redistributes as required, expected diffraction and interference energy distribution character are generated,
Belong to the prior art.
Although above having made detailed description to the utility model with generality explanation and specific embodiment,
On the basis of the utility model, it can be made some modifications or improvements, this is apparent to those skilled in the art
's.Therefore, these modifications or improvements on the basis of without departing from the spirit of the present invention, belong to the utility model and want
Seek the range of protection.
Claims (4)
1. a kind of femtosecond laser compression set based on heterojunction structure waveguide array, the femtosecond laser compression set includes pulse
Laser light source, the pulsed laser light source are connected with collimating element, it is characterised in that：The compression set includes heterojunction structure wave
Array is led, the heterojunction structure waveguide array is the array formed with the single mode waveguide of different spacing and weak coupling parameter.
2. a kind of femtosecond laser compression set based on heterojunction structure waveguide array according to claim 1, feature exist
In：The heterojunction structure waveguide array forms array interface by aluminum gallium arsenide waveguide.
3. a kind of femtosecond laser compression set based on heterojunction structure waveguide array according to claim 1, feature exist
In：The femtosecond laser compression set further includes pulse compression module, and the pulse compression module includes heterojunction structure waveguide battle array
Row and programmable phase element, the pulse compression module use LCD space light modulator or acousto-optic modulator, pulse compression
Module for being compressed to the light pulse of input by heterojunction structure waveguide array, the programmable phase element with it is described different
Matter structured waveguide array establishes a connection, and programmable phase element is used to carry out phase compensation to the light pulse beam of input.
4. a kind of femtosecond laser compression set based on heterojunction structure waveguide array according to claim 3, feature exist
In：The programmable phase element is connected with control terminal and laser output mirror.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108173109A (en) * | 2018-02-24 | 2018-06-15 | 东莞理工学院 | A kind of femtosecond laser compression method and device based on heterojunction structure waveguide array |
| CN112421353A (en) * | 2020-10-16 | 2021-02-26 | 中国科学院西安光学精密机械研究所 | Device for inhibiting gain narrowing and obtaining ultrashort pulse amplification output and adjusting method |
-
2018
- 2018-02-24 CN CN201820267925.6U patent/CN208028366U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108173109A (en) * | 2018-02-24 | 2018-06-15 | 东莞理工学院 | A kind of femtosecond laser compression method and device based on heterojunction structure waveguide array |
| CN112421353A (en) * | 2020-10-16 | 2021-02-26 | 中国科学院西安光学精密机械研究所 | Device for inhibiting gain narrowing and obtaining ultrashort pulse amplification output and adjusting method |
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