CN110132851A - A kind of instantaneous two-dimensional opto-acoustic wave measurement method based on the interference of femtosecond pulse - Google Patents
A kind of instantaneous two-dimensional opto-acoustic wave measurement method based on the interference of femtosecond pulse Download PDFInfo
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- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 22
- 238000001514 detection method Methods 0.000 claims description 20
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 16
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 claims description 16
- 239000013078 crystal Substances 0.000 claims description 15
- 238000001914 filtration Methods 0.000 claims description 12
- QBLDFAIABQKINO-UHFFFAOYSA-N barium borate Chemical compound [Ba+2].[O-]B=O.[O-]B=O QBLDFAIABQKINO-UHFFFAOYSA-N 0.000 claims description 8
- 229910052701 rubidium Inorganic materials 0.000 claims description 8
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 claims description 8
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- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
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Abstract
The invention belongs to field of optical measurements, a kind of instantaneous two-dimensional opto-acoustic wave measurement method based on the interference of femtosecond pulse is disclosed, 1) ultrafast imaging system is constructed, realizes that mode locking femto-second laser, acousto-optic pulse selector, pumping pulse, direct impulse are synchronous with cameras frame rate；It is characterized in that, 2) power amplification after femtosecond pulse frequency reducing, the mode locking femtosecond laser of high repetition frequency carries out frequency reducing, and the femtosecond pulse after frequency reducing carries out power amplification；3) photoacoustic waves induction generation module forms photoacoustic waves and filters out light ambient noise；4) it realizes that reference light and the measurement interference of light, reference light carry out high frequency modulated using Mach Zehnder interferometry method, improves interference fringe signal-to-noise ratio；5) pulse interference image is acquired within the single camera exposure time, completes instantaneous two-dimensional opto-acoustic wave measurement using Fourier transformation phase reconstruction algorithm.Using the time synchronization of camera exposure and ultrashort pulse, experiment obtains the ultrafast imaging of subpicosecond magnitude temporal resolution.
Description
Technical field
The invention belongs to field of optical measurements more particularly to a kind of instantaneous two-dimensional opto-acoustic waves based on the interference of femtosecond pulse
Measurement method.
Background technique
Ultrafast laser induction photoacoustic imaging can be used for the non-linear absorption and refracting characteristic research of material, inanimate object
The Non-invasive detection of light spectrum image-forming and the damage of sub-surface microelectronics, photoacoustic waves are usually in tiny area with velocity of sound fast propagation, therefore,
The photoacoustic waves INSTANTANEOUS OBSERVATION of the big visual field of high lateral resolution is an extremely challenging task, so far, due to lacking
The limited one-dimensional piezoelectricity of spatial and temporal resolution or laser vibrometer sensing is usually used in high speed two-dimension sensor, the characterization of photoacoustic waves
Device.
High speed camera imaging based on pulsed light reflection or transmitted light can be used to observe quick physical phenomenon, ultrashort arteries and veins
The more recent application for rushing laser makes people observe picosecond even ultra-fast optical imaging faster, especially by pumping-spy
Surveying experiment may be implemented photon-matter interaction observation.However, being currently available that high speed two-dimension camera is also not enough to carry out skin
Second grade pump probe imaging, therefore one-dimensional photodetector is often used, the state-of-the-art photodetector response time has reached several
Picosecond.Realize ultrahigh time resolution rate two-dimensional measurement, can by affixed one's name in the middle part of grid is laid out multiple photodetectors or
Single photodetector is scanned on target area in order come extend it is one-dimensional detect two-dimensional imaging, but its achievable visual field is not
Greatly, and imaging transverse resolution ratio is lower.Simultaneously as the light ambient noise of camera exposure time, is based on short pulse pumping-detection
The contrast of imaging is lower, limits the image quality of ultra-fast dynamics, cannot achieve quantitative analysis.
Summary of the invention
The purpose of the present invention is to solve this problems, are based on the ultrafast time domain specification of femtosecond pulse, provide one kind and be based on
The temporal resolution of the instantaneous two-dimensional opto-acoustic wave measurement method of femtosecond pulse interference, pulse interference scheme can achieve
250fs is only captured a pulse interference fringe image, while being filtered out using second-harmonic generation in camera each time for exposure
Light amplification spontaneous radiation ambient noise, electric light phase-modulation improve striped signal-to-noise ratio, utilize Fourier transformation phase reconstruction algorithm
Realize the quantitative measurment of instantaneous two-dimensional opto-acoustic wave.
For achieving the above object, the technical scheme is that
It is a kind of based on femtosecond pulse interference instantaneous two-dimensional opto-acoustic wave measurement method, include the following steps, 1) building fly
Second single laser pulse interferes ultrafast imaging system, realizes mode locking femto-second laser, acousto-optic pulse selector, pumping pulse, detection
Pulse is synchronous with cameras frame rate；It is characterized in that,
2) power amplification after femtosecond pulse frequency reducing, the mode locking femtosecond laser of high repetition frequency carry out frequency reducing, and to frequency reducing after
Femtosecond pulse carry out power amplification；
3) photoacoustic waves induction generation module forms photoacoustic waves, filters out detection light light ambient noise using nonlinear crystal；
4) reference light is realized using Mach Zehnder interferometry method and measures the interference of light, using electrooptic modulator to reference light
High frequency modulated is carried out, interference fringe signal-to-noise ratio is improved；
5) instantaneous two-dimensional opto-acoustic wave measurement, pulse interference image is only captured within the single camera exposure time, utilizes Fu
In leaf transformation phase reconstruction algorithm complete instantaneous two-dimensional opto-acoustic wave measurement.
Preferably, 5) the collected pulse interference image of camera includes the phase information of photoacoustic waves.
Preferably, the femtosecond pulse interferes instantaneous two-dimensional opto-acoustic wave measuring apparatus, including mode-locked laser frequency reducing to be put
Big module 1, photoacoustic waves induction generation module 26 and pulse Mach Zehnder interferometry module 27, from the mode-locked laser frequency reducing
The femtosecond pulse of amplification module output is divided into pump light and detection light after frequency reducing is amplified, and the induction of pump light incidence photoacoustic waves produces
Raw module photoacoustic waves pass through optical time delay after filtering out detection light light ambient noise using the second-harmonic generation of nonlinear crystal,
Incident pulse Mach Zehnder interferometry module 27.
Preferably, the mode-locked laser frequency reducing amplification module 1, including mix ytterbium femtosecond mode-locked laser 2, acousto-optic pulse choosing
It selects device 3, mix ytterbium laser amplifier 4, rubidium atomic clock 6 and arbitrary waveform generator 5, the rubidium atomic clock 6 exports sinusoidal signal point
It is described to mix ytterbium femtosecond mode-locked laser 2 not as the reference frequency for mixing ytterbium femtosecond mode-locked laser 2 and arbitrary waveform generator 5
Femtosecond laser seed light source is exported, by photoacoustic pulse selector 3,5 output drive signal 7 of arbitrary waveform generator and camera touching
Signal 8, driving signal 7 controls the working time window of acousto-optic pulse selector 3, pulse choice is carried out, using mixing ytterbium laser
Amplifier 4 carries out power amplification to the femtosecond pulse after frequency reducing；Synchronizing mode-licked femto-second laser repetition rate, acousto-optic pulse choice
Device, pumping pulse, direct impulse and cameras frame rate.
Preferably, photoacoustic waves induce generation module 26, including beam splitter prism 9, pump light 10 and microcobjective 11, dichroic
Mirror 12, amplified pulsed light are divided into two bundles by beam splitter prism 9, and respectively as pump light 10 and detection light 14, pump light passes through
It is focused by microcobjective 11, photoacoustic waves is generated by the incident acetone soln 15 of dichroscope 12.
Preferably, pulse Mach Zehnder interferometry module, including barium metaborate nonlinear crystal 13, delay optical path 16,
Bandpass optical filtering device 18, Amici prism 2 23, reflecting mirror 21, electrooptic modulator 20, acetone soln 22, is shown Amici prism 1
Speck mirror 24 and CMOS camera 25 detect light after barium metaborate nonlinear crystal 13 filters out light ambient noise, pass through delay
Optical path 16 is reflected into reflecting mirror 17, filters the prism 1 that is split through bandpass optical filtering device 18 and is divided into reference light and measurement light, ginseng
It examines light to be reflected after electrooptic modulator 20 is modulated and improves interference fringe signal-to-noise ratio by reflecting mirror 21, passes sequentially through no pumping
After the acetone soln 22 of photoinduction, the reflection of Amici prism 2 23 and microcobjective 24, incident CMOS camera 25；It is filtered using band light passing
Wave device chooses visible light wave range laser, and the interference image of single pulse is only captured in the single exposure time of CMOS camera.
Compared with prior art, the beneficial effects of the present invention are:
This method of the present invention realizes instantaneous two-dimensional opto-acoustic wave measurement using general camera for the first time.Ultrafast pulse interferometer
It is the effective tool of high contrast, ultrafast two-dimensional optical imaging.Utilize camera each time for exposure (1ms) and ultrashort pulse
The time synchronization of (0.25ps), experiment obtain the ultrafast imaging of subpicosecond magnitude temporal resolution.With existing Pulse Imageing phase
Than nonlinear second harmonic filtering restrained effectively the amplified spontaneous emission in pulse, improve interference fringe signal-to-noise ratio.It is logical
It crosses pump probe experiment quantitative measurment 60.8MHz photoacoustic waves to propagate in a liquid, demonstrates two-dimentional ultrahigh speed interference imaging energy
Power, this method demonstrate the feasibility of measurement result in acetone soln.It is expected to provide for different photon matter interactions
A kind of cost-effective novel ultrafast imaging method.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows and meets implementation of the invention
Example, and be used to explain the principle of the present invention together with specification.
Fig. 1 is the structure chart for the instantaneous two-dimensional opto-acoustic wave measurement method interfered the present invention is based on femtosecond pulse.
Fig. 2 is the noise interference that has powerful connections for the instantaneous two-dimensional opto-acoustic wave measurement method interfered the present invention is based on femtosecond pulse
Figure.
Fig. 3 is interfering without ambient noise for the instantaneous two-dimensional opto-acoustic wave measurement method interfered the present invention is based on femtosecond pulse
Figure.
Fig. 4 is the induced with laser photoacoustic waves for the instantaneous two-dimensional opto-acoustic wave measurement method interfered the present invention is based on femtosecond pulse
Without ambient noise interference pattern.
Fig. 5 is the 10ns delay phase weight for the instantaneous two-dimensional opto-acoustic wave measurement method interfered the present invention is based on femtosecond pulse
Composition.
Fig. 6 is the 30ns delay phase weight for the instantaneous two-dimensional opto-acoustic wave measurement method interfered the present invention is based on femtosecond pulse
Composition.
Specific embodiment
Below in conjunction with attached drawing, technical scheme in the embodiment of the invention is clearly and completely described.
As shown in figures 1 to 6, a kind of instantaneous two-dimensional opto-acoustic wave measurement method based on the interference of femtosecond pulse, including walk as follows
Suddenly, 1) building femtosecond laser pulse interferes ultrafast imaging system, reduces the repetition rate of femtosecond pulse, realizes that mode locking femtosecond swashs
Light device, acousto-optic pulse selector, pumping pulse, direct impulse are synchronous with cameras frame rate；
2) frequency reducing is carried out using mode locking femtosecond laser of the acousto-optic pulse selector to high repetition frequency, and utilizes and mixes ytterbium laser
Amplifier carries out power amplification to the femtosecond pulse after frequency reducing；
3) high power femtosecond pulse is divided into two beams, respectively as pump light and detection light, pump light incidence fluid sample, light
Sound wave induces generation module to form photoacoustic waves, filters out detection light light ambient noise using the second-harmonic generation of nonlinear crystal；
4) reference light is realized using Mach Zehnder interferometry method and measures the interference of light, using electrooptic modulator to reference light
High frequency modulated is carried out, interference fringe signal-to-noise ratio is improved；
5) instantaneous two-dimensional opto-acoustic wave measurement, using rubidium atomic clock synchronizing mode-licked femto-second laser repetition rate, acousto-optic pulse
Selector driving signal and cameras frame rate, using the flight time of optical path delay synchronous pump light and detection light, in single phase
The interference image of acquisition capture pulse in the machine time for exposure realizes instantaneous two-dimentional light using Fourier transformation phase reconstruction algorithm
Acoustic measurement.
Preferably, 5) the collected pulse interference image of camera includes the phase information of photoacoustic waves.Become using Fourier
It changes phase reconstruction algorithm photoacoustic waves are reconstructed, realizes the instantaneous two-dimensional opto-acoustic wave measurement of every width interference pattern, specific algorithm are as follows:
The interference strength of point (x, y) can be expressed as I (x, y)=a (x, y)+b (x, y) cos [+2 π f of φ (x, y) in two-dimensional surface0X],
A (x, y) and b (x, y) is background light intensity and fringe contrast, f respectively0It is acquired for striped carrier frequency using Fourier transformation
Phase (x, y)=tan-1{ Im [c (x, y)]/Re [c (x, y)] }, whereinThen meter is utilized
The phase of obtained each pixel reconstructs instantaneous two-dimensional surface photoacoustic waves, temporal resolution 250fs.
Preferably, the femtosecond pulse interferes instantaneous two-dimensional opto-acoustic wave measuring apparatus, including mode-locked laser frequency reducing to be put
Big module 1, photoacoustic waves induction generation module 26 and pulse Mach Zehnder interferometry module 27, from the mode-locked laser frequency reducing
The femtosecond pulse of amplification module output is divided into pump light and detection two beam of light, pump light incidence sample optoacoustic after frequency reducing is amplified
Wave induces generation module to form photoacoustic waves, using the second-harmonic generation of nonlinear crystal, after filtering out detection light light ambient noise
By optical time delay, incident pulse Mach Zehnder interferometry module 27；Using rubidium atomic clock as reference frequency, using any
Waveform generator generates acousto-optic pulse selector driving signal 7 and camera trigger signal 8, and synchronizing mode-licked femto-second laser repeats frequency
Rate, acousto-optic pulse selector, pumping pulse, direct impulse and cameras frame rate, camera, which captures, carries instantaneous two-dimensional opto-acoustic wave
Phase information obtains interference fringe, realizes instantaneous two-dimensional opto-acoustic wave measurement using Fourier transformation phase reconstruction algorithm.
As shown in Figure 2 and Figure 3, fringe contrast is increased to 1 from 0.33 using barium metaborate nonlinear crystal by this method.
As shown in figure 3, being interfered using pulse, CMOS camera captures the instantaneous two-dimensional opto-acoustic wave phase information of carrying and must do
Relate to striped.
The pulse interference light intensity is represented byWherein τ reference arm
The optical time delay between measurement arm, IoFor average intensity,Measurement arm phase caused by photoacoustic waves is generated for pumping photoinduction
Delay, γ (τ) are interference contrast function.
As shown in Figure 5,6, the present invention is reconstructed two-dimensional opto-acoustic wave phase, realizes the measurement of instantaneous two-dimensional opto-acoustic wave.
The mode-locked laser frequency reducing amplification module 1, including mix ytterbium femtosecond mode-locked laser 2, acousto-optic pulse selector 3,
Ytterbium laser amplifier 4, rubidium atomic clock 6 and arbitrary waveform generator 5, camera trigger signal 8 are mixed, what the rubidium atomic clock 6 exported
10MHz sinusoidal signal provides frequency respectively as the reference frequency for mixing ytterbium femtosecond mode-locked laser 2 and arbitrary waveform generator 5
Benchmark, the ytterbium femtosecond mode-locked laser 2 of mixing export the femtosecond laser seed light source that repetition rate is 100MHz, pass through optoacoustic arteries and veins
Selector 3,5 output drive signal 7 of arbitrary waveform generator and camera trigger signal 8 are rushed, driving signal 7 controls acousto-optic pulse choosing
The working time window of device 3 is selected, pulse choice is carried out, reduces repetition rate, is flown using ytterbium laser amplifier 4 is mixed to after frequency reducing
Pulse per second (PPS) carries out power amplification.Synchronizing mode-licked femto-second laser repetition rate, acousto-optic pulse selector, pumping pulse, detection arteries and veins
Punching and cameras frame rate.
Preferably, photoacoustic waves induce module 26, including beam splitter prism 9, pump light 10 and microcobjective 11, dichroscope
12, amplified pulsed light is divided into two bundles by beam splitter prism 9, respectively as pump light 10 and detection light 14, pump light by by
Microcobjective 11 focuses, generates photoacoustic waves by the incident acetone soln 15 of dichroscope 12.It is poly- to pump light using microcobjective
Coke, by acetone soln incident after dichroscope, induction generates photoacoustic waves.Light is detected to filter by barium metaborate nonlinear crystal 13
After light ambient noise, pass through the optical path 16 that is delayed, incident pulse Mach Zehnder interferometry module 27.
The transforming function transformation function of the electric field energy E of above-mentioned detection light t at any time can be expressed asIts
Middle voIndicate that frequency of light wave, I (t) indicate the light wave envelope intensity for meeting Gaussian Profile, herein the half peak height width (pulse of light intensity
Width) it is 250fs.
Preferably, pulse Mach Zehnder interferometry module, including barium metaborate nonlinear crystal 13, delay optical path 16,
Bandpass optical filtering device 18, Amici prism 2 23, reflecting mirror 21, electrooptic modulator 20, acetone soln 22, is shown Amici prism 1
Speck mirror 24 and CMOS camera 25 detect light after barium metaborate nonlinear crystal 13 filters out light ambient noise, pass through delay
Optical path 16 is reflected into reflecting mirror 17, filters the prism 1 that is split through bandpass optical filtering device 18 and is divided into reference light and measurement light, ginseng
It examines light to be reflected after electrooptic modulator 20 is modulated and improves interference fringe signal-to-noise ratio by reflecting mirror 21, passes sequentially through no pumping
After the acetone soln 22 of photoinduction, the reflection of Amici prism 2 23 and microcobjective 24, incident CMOS camera 25；It measures light and passes through two
To after Look mirror reflection, the acetone soln 15 of pumping photoinduction, after Amici prism and microcobjective, incident CMOS phase are passed sequentially through
Machine changes measurement light and reference light optical path difference by adjusting the optical path that is delayed；Visible light wave range is chosen using bandpass optical filtering device to swash
Light only captures the interference image of single pulse in the single exposure time of CMOS camera.Using nonlinear crystal to filter out detection
Light ambient noise realizes pump light using delay optical path and detects the time synchronization of light, utilizes bandpass optical filtering device Selection Center
Wavelength is the visible light wave range laser of 532nm, is modulated using electrooptic modulator to reference light, and interference fringe noise is improved
Than only capturing the interference image of single pulse in the single exposure time of CMOS camera.
Embodiments described above is only a part of the embodiment of the present invention, instead of all the embodiments.Based on this
Embodiment in invention, every other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, shall fall within the protection scope of the present invention.
Claims (6)
1. a kind of instantaneous two-dimensional opto-acoustic wave measurement method based on the interference of femtosecond pulse, includes the following steps, 1) building femtosecond
Single laser pulse interferes ultrafast imaging system, realizes mode locking femto-second laser, acousto-optic pulse selector, pumping pulse, detection arteries and veins
It rushes synchronous with cameras frame rate；It is characterized in that,
2) the mode locking femtosecond laser of power amplification after femtosecond pulse frequency reducing, high repetition frequency carries out frequency reducing, the femtosecond arteries and veins after frequency reducing
Rush in row power amplification；
3) photoacoustic waves induction generation module forms photoacoustic waves, filters out detection light light ambient noise using nonlinear crystal；
4) reference light is realized using Mach Zehnder interferometry method and measures the interference of light, reference light is carried out using electrooptic modulator
High frequency modulated improves interference fringe signal-to-noise ratio；
5) pulse interference image is acquired within the single camera exposure time, completes wink using Fourier transformation phase reconstruction algorithm
When two-dimensional opto-acoustic wave measurement.
2. the instantaneous two-dimensional opto-acoustic wave measurement method according to claim 1 based on the interference of femtosecond pulse, it is characterised in that:
5) the collected pulse interference image of camera includes the phase information of photoacoustic waves.
3. the instantaneous two-dimensional opto-acoustic wave measurement method according to claim 1 based on the interference of femtosecond pulse, it is characterised in that:
The femtosecond pulse interferes instantaneous two-dimensional opto-acoustic wave measuring apparatus, including mode-locked laser frequency reducing amplification module (1), photoacoustic waves
Generation module (26) and pulse Mach Zehnder interferometry module (27) are induced, amplifies mould from the mode locking femto-second laser frequency reducing
The seed femtosecond pulse of block output is divided into pump light and detection light after frequency reducing is amplified, and the induction of pump light incidence photoacoustic waves generates
Module (26) forms photoacoustic waves；Using the second-harmonic generation of nonlinear crystal, pass through light after filtering out detection light light ambient noise
Learn delay, incident pulse Mach Zehnder interferometry module (27).
4. the instantaneous two-dimensional opto-acoustic wave measurement method according to claim 3 based on the interference of femtosecond pulse, it is characterised in that:
The mode-locked laser frequency reducing amplification module (1), including mix ytterbium femtosecond mode-locked laser (2), acousto-optic pulse selector (3), mix
Ytterbium laser amplifier (4), rubidium atomic clock (6) and arbitrary waveform generator (5) and camera trigger signal (8), the rubidium atomic clock
(6) output sinusoidal signal is respectively as the reference frequency for mixing ytterbium femtosecond mode-locked laser (2) and arbitrary waveform generator (5), institute
It states and mixes ytterbium femtosecond mode-locked laser (2) output femtosecond laser seed light source, pass through acousto-optic pulse selector (3), random waveform hair
Raw device (5) output drive signal (7), driving signal (7) control the working time window of acousto-optic pulse selector (3), carry out arteries and veins
Punching selection carries out power amplification to the femtosecond pulse after frequency reducing using ytterbium laser amplifier (4) is mixed；Synchronizing mode-licked femto-second laser
Repetition rate, acousto-optic pulse selector, pumping pulse, direct impulse and cameras frame rate.
5. the instantaneous two-dimensional opto-acoustic wave measurement method according to claim 3 based on the interference of femtosecond pulse, it is characterised in that:
Photoacoustic waves induce generation module (26), including beam splitter prism (9), pump light (10) and microcobjective (11), dichroscope (12),
Amplified pulsed light is divided into two bundles by beam splitter prism (9), and respectively as pump light (10) and detection light (14), pump light passes through
It is focused by microcobjective (11), photoacoustic waves is generated by dichroscope (12) incident acetone soln (15).
6. the instantaneous two-dimensional opto-acoustic wave measurement method according to claim 3 based on the interference of femtosecond pulse, it is characterised in that:
Pulse Mach Zehnder interferometry module, including barium metaborate nonlinear crystal (13), delay optical path (16), bandpass optical filtering device
(18), Amici prism (19), Amici prism two (23), reflecting mirror (21), electrooptic modulator (20), microcobjective (24) and CMOS
Camera (25) detects light after barium metaborate nonlinear crystal (13) filters out light ambient noise, anti-by delay optical path (16)
Reflecting mirror (17) are mapped to, the prism one (19) that is split is filtered through bandpass optical filtering device (18) and is divided into reference light and measurement light, reference
Light is reflected after electrooptic modulator (20) is modulated and improves interference fringe signal-to-noise ratio by reflecting mirror (21), passes sequentially through no pump
Behind the acetone soln (22) of Pu photoinduction, Amici prism two (23) reflection and microcobjective (24), incident CMOS camera (25).
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Cited By (4)
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| CN111189528A (en) * | 2020-01-09 | 2020-05-22 | 天津大学 | High-precision underwater sound velocity measurement method based on femtosecond laser frequency comb |
| CN112284510A (en) * | 2020-10-26 | 2021-01-29 | 东南大学 | Coherent acoustic phonon echo induction and detection method in multilayer two-dimensional semiconductor |
| CN114928699A (en) * | 2022-04-28 | 2022-08-19 | 中山大学 | Ultrafast imaging method based on color digital camera |
| CN115079405A (en) * | 2022-07-05 | 2022-09-20 | 东南大学 | Method for generating photoacoustic wave in air by using ultrashort laser pulse |
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