Science method
Laser Ablation - Science method
Laser ablation is the process of removing material from a solid (or occasionally liquid) surface by irradiating it with a laser beam. At low laser flux, the material is heated by the absorbed laser energy and evaporates or sublimates. At high laser flux, the material is typically converted to a plasma. Usually, laser ablation refers to removing material with a pulsed laser, but it is possible to ablate material with a continuous wave laser beam if the laser intensity is high enough.
Questions related to Laser Ablation
In diversity era of Varicose Veins technology treatments, many devices compete each other. EVLA or EndoVenous Laser Ablation is one Procedure that highly usage by Vein Specialists. Will EVLA lead among the other procedures?
I've had two articles published. Both are nearly identical, and I'd like to write a comparison article about their outcomes. For this, I'll need to use Comsol for simulation or machine learning/deep learning to validate the results. I'd appreciate it if someone could assist me in this area and contribute to the comparative essay.
- https://www.researchgate.net/publication/372887967_Formation_of_AgshellAucore_Bimetallic_Nanoparticles_by_Pulsed_Laser_Ablation_Method_Effect_of_ColloidalSolution_Concentration
- https://www.researchgate.net/publication/369671290_Optical_properties_of_synthesized_AuAg_Nanoparticles_using_532_nm_and_1064_nm_pulsed_laser_ablation_effect_of_solution_concentration
please i would like to collect all the parameters related to the synthesis of nanoparticles using laser ablation, in terms of laser parameters, liquid parameters, environment parameters and if any other parameters
Thanks
I have read that the Laser Ablation (LA) system is third party system can be added with ICP-MS for direct sample reading and specifically U-Th-Pd (Zircon) age dating purpose. There have different model of Perkin Elmer, Agilent, Thermo or other brand in the market. But which brand and model is more suitable for future expansion of LA in terms of analysis result quality, cost and easy to use?
I use Fujikura CT-30 cleaver for PCF cleaving to use for supercontinuum generation. Initially, it seems like working fine as I could get high coupling efficiency (70-80%) in the 3.2um core of PCF. However, after some time (several hours) I notice that coupling efficiency decreases drastically and when I inspect the PCF endface with an IRscope, I could see a bright shine on the PCF end facet, which is maybe an indication that the end face is damaged. Also, I want to mention that the setup is well protected from dust and there is no chance of dusting contaminating the fiber facet.
Please suggest what should be done to get an optimal cleave, shall I use a different cleaver (pls suggest one) or there are other things to consider.
Thanks
Why the values of the intensity ratio of doublet spectra of the laser-produced plasma spectrum differ from the theoretical value of the intensity ratio given in NIST data.
Can ultrafast lasers be used for carbon fiber ablation.
Hello, I have a doubt about nano fabrication in liquid, I would like to know when we use Femto second laser ablation of a solid target in a material, then we can choose able to see what patterns we have on the surface of solid, and also nano particles that are in the solution, generated during ablation process? In other words when we talk about fabrication do we mean making patterns or generating of nano collisions in liquid? Or does it just depend on what is the aim of project?
hope my question is clear.
Hi,
I am planning to simulate nanosecond pulsed laser heating/ ablation on metal. Comsol or Lumerical, which would be the best for this simulation? Also, I would appreciate if anyone can suggest me a good tutorial on that. Thanks.
Dear colleagues I have synthesized ZnO from Zn Plate using fiber laser using liquid laser ablation but it has shown no antibacterial activity
could anyone suggest how to solve such a problem?
Best Regards
Dear Colleagues......
How can we determine the ablation threshold of a material in liquid laser ablation?
many thanks
Huda
I am the manager of a laser ablation lab at Cornell and we have an ESI NWR193HE that was installed Aug 2020. Its only been truly operational for about a year but we are experiencing a high loss of laser energy over time. Fluences of 5-10 J/cm2 are costing more and more of the laser's energy output. At about 6 months, we were already at half of the installation energy output, now at a year we're at a quarter. The service engineer has quoted us for some very expensive optic repairs but has anyone else experienced such a high loss this quickly before?
I want to generate second harmonic using the long-wavelength (1600nm) part of the supercontinuum as pump. How to decide on choosing the right focal length lens for SHG. I am using 10mm-long MgO-PPLN. The average power at the output of supercontinuum is ~100mw and ~40mw for SHG (after long-pass dichroic mirror). Since the temporal profile of the signal after SC is not known (specifically for the 1600nm part ), is it suitable to treat that signal as continuous-wave for SHG pump. For CW pump, the literature suggests that the ratio of crystal length to the confocal parameter (2*Rayleigh range) should be 2.84 for optimal SHG. From where we may calculate the right focal length of the lens to focus light into the SHG crystal.
Hi I am trying to synthesize quantum dots for the fabrication of electrodes for HER. I have metal oxide power so conventionally people use plates as target for production of Quantum Dots. So is it possible to use powder as target precurosor for synthesis of Quantum dots?
I synthesized gold nanoparticles by pulsed laser ablation in different ph solutions. At acids 1 and 3, it didn't show any absorbance peak whereas at pH 7 and 11 it does have absorbance peak. However most of the chemical methods that produces gold nanoparticles mention that acid can resulting in formation of nanoparticles.
I have generated an octave-spanning supercontinuum (750-1700nm) using 140fs pulses. I want to frequency double longer wavelength (1600nm) using PPLN crystal. Since, I don't know what's the pulse duration/shape, peak power, or energy in that specific bandwidth (around 1600nm), how should I choose SHG crystal (PPLN) for SHG. Specifically, how to determine crystal length and acceptance bandwidth for optimal SHG at 800nm.
Thanks in advance.
I want to produce an N-doped Carbon using GO or AC with Urea as a precursor. But I have a limited technology such as CVD, laser ablation, etc. Do you have any suggestion?
Usually when we preparation NPs from metals (Tio2, Ag) by laser ablation in Liquid, the concentration of NPS in liquid is unknown, my Question how can measuring this concentration for NPS in the same solution without evaporate this solution
i am prepare ZnO/Au Nanoparticals by laser ablation and mixing together, How can i know the core-shell theory has been ِAchievied from the result?
Hi,
I am working on a MD problem to simulate the laser ablation. I know that people calculate the highest temperature in the material through the solution of heat conduction equation FEA simulations etc., and apply the calculated temperature directly in MD simulations. I am wondering if there is a direct approach or any other method to do this directly in MD?
Many Thanks,
Vivek
When analyzing geoloical samples (element or isotope composition) with ICP-MS which type of laser ablation system would provide better result - nanosecond laser (193//213 nm) or femtosecond one?
We have been attempting to sinter conductive silver ink onto a glass substrate using laser ablation. So we want to know if there are any pre-treatment methods which can enhance the quality of the sintered lines or help in increasing the efficiency of the sintering process.
Is there a reason why nobody performed Doppler cooling of Y III (Y^{2+}) ions? It seems that transitions are similar to those in Ca+ ions (three level system). Y III ions could be produced by laser ablation, which was the method used for getting optical spectra of these ions in past.
When nano particles used for strengthening or to improve some property it needs to dispersion in the matrix phase by ultrasonic bath or tip.
What will be the ablation temperature of Cu and Al. If we estimate it from ClT+Ce'T2= Enthalpy of evaporation ( Where Cl- specific heat of lattice and Ce'- specific heat constant for electron) for Cu it is around 10,000 K and for Al it is around 13,000 K is it correct?
I am planning to perform a laser ablation experiment on Ar diffused quartz in different depths, creating free Ar molecules which I need to capture instantaneously using a vaccum pump. But cant understand how should I design the experiment, and how much power the vaccum pump should have. Would really appreciate if I can get some suggestion.
Hi there,
Do you know how to measure longitudinal and transverse modes in lasers? I need to know the cutting edge and experimental techniques related to this subject.
Bests,
I would like to know who is actively working on this topic. I would appreciate some feedback on the type of lasers that is being used for that, materials and applications.
Thank you so much.
Best regards
Does anyone could tell me which kind of features should I consider between the techniques Laser-Induced Breakdown Spectroscopy and Laser Ablation Inductively Coupled Plasma Mass Spectrometry to buy an instrument that will be used in geological samples for a geochemistry fingerprint focused research?
Both use Laser Ablation for particle generation so the sample preparation step is minimal but I would like to know about the instrument and maintance costs (if somebody has a shallow idea about it), the detection limits and the advantages that have one over the other.
I deeply appreciate your help in advance.
I am doing research on tin and tin oxide nanoparticles using laser ablation method. Using Nd:YAG laser in visible range (532nm) .By increasing the energy i have observed the decrease in the ratio of number of oxides. What might be the reason?The sample exposure time is constant/
How can be obtainable nanoparticles colloid from graphene-oxide by means of laser ablation and which are liquids types will be suitable for this preparation ?
I’m interested in deposition condition of Li2O. Im assuming there is a non linear transfer from target to substrate, no? Furthermore im interested in finding suppliers for Li2O sputtering targets as well as sinter conditions for fabrication of the target on my own.
I coated polymerized PDMS with a 50 nm layer of Al in an evaporator and got a satisfactory thin layer coverage, but then when using a 532 nm layer on it, it seems to make holes on it (powers between 22 mW and 0.2 mW), and when water is present it overheats it even at very low laser powers. Any idea of why?
I'm looking for a polymer (or even a type of tape) that can be used with high energy lasers in photoacoustic experiments.
The material must be able to repeatedly be exposed to 500 mJ/cm^2 from a nanosecond (5 nanoseconds) or picosecond laser pulse (8 picoseconds) without burning AND it must have favorable acoustic properties (an acoustic impedance close-ish to water at 1.5 MRayls) AND it must be optically transparent in the range from 400-700 nm.
Is there anything even remotely close to being able to handle these types of energies/powers in a polymer form or would it all have to be glass?
I am preparing gold nano particles by laser ablation with water as medium. The wavelength of laser is IR range.But water absorb IR wavelength. So I like to know the effect of IR absorption by water at the time of ablation. Whether it will effect the ablation process?
I am preparing gold nano particles by laser ablation method. the medium is water. I have a genuine doubts how the ablation takes place for gold even though it has 99 % reflectivity. I want to know about the physics behind it.
Can we calculate the threshold energy in the field of laser ablation of gold nanoparticles ?
Which impurities are present in stainless steel SS 304?
Why CW laser is not enough to production nanoparticles from metals or semiconductors as ablation method ?
Actually i am working on LIBS..And want to study Plasma parameters..
What are the suitable liquid to immersed in it, the Si or. Sio2 or Na2SiO3 to production si-nanoparticles by mean of laser ablation?
I would to obtaine the mental nanoparticlesWhat are the suitable liquid to immersed the cuo or cu2o to production cu-nanoparticles by mean of laser ablation?
comparsion to other methods of productions nanoparticles , is the laser ablation the most methods to smallest nanoparticles obtainable and why?
as long as, how can prevent the aggregation the metal nano particles which are prepared by laser ablation ?
Are you working with preparation nanoparticles Or any thing more
We are working in preparation of core-shell (Ag@Au) collide by laser ablation in liquid. if Variation of thickness of shell(change in laser pulses) , are there any change in shape or width or position of Absorption peak ?? that can enable me to control shell thickness?
I have prepared nanoparticles using laser ablation method.I have shined Nd: YAG laser (532nm) for 40 minutes and used different liquids(acetone,ethanol and methanol) at 30 and 60 mJ laser energy. My SEM result shows that with the increase of laser energy the particles size increases. My Uv absorbance result shows blue shift with the increase of energy in case of ethanol and acetone. I am attaching my results.Kindly let me know if i am not analyzing it properly...Ethanol and acetone respectively
I have some semi-finished high-efficiency solar cells(PERC), for no local aluminum back contact after laser ablation. I want to removal the local SiO2 at the ablation area which maybe produce from being exposed to the air for long time. Hydrofluoric acid is a ideal selection, but it also etch the SiNx layer. So are there any other way for this selective etching?
I have prepared nanoparticle in de-ionized water using laser ablation at 180 mJ laser energy...i calculated band gap as 4.26 eV using tauc plot and kept my sample in liquid for and after 15 days again i go for UV absorption spectroscopy and my Tauc plot showed that two band gaps appears one at 3.41 eV and other at 4.25. What might be the reason? I´m attaching my result.
Hello there,
I've been working on fs laser processing on the surface of transparent materials, i.e. BK7, sodalime glass slide, polymers such as PMMA. I am trying to optimize laser process (given that pulse duration is 400fs and wavelength is 1030nm) so that after laser ablation (trenching, grooving, free form cavities) the surface roughness remains as small as possible (ideally still transparent).
I can achieve some 500nm Ra after laser machining myself. Anyone here doing better or knows how to do it better than that?
Cheers
Hi,
I am working in ultrafast laser tissue ablation area. I feel it's difficult to find the laser focus in the tissue surface. Can anyone suggest me a technique to overcome this issue? I can't use the normal laser focusing method for material processing.
Syam
Laser ablation (LA) is is a less known and few employed procedure to accomplish hypertermic necrosis of liver tumors. LA was described for the first time by Bown in 1983. A main advantage of LA is that laser light can be delivered precisely and predictably into any location of the liver without affecting surrounding tissue. The light is transmitted from the source to the patient through flexible optic fibres. In the technique used by us, very thin bare optical fibers, measuring 300 mµ in diameter and with flat tips are inserted through a 21-gauge needle.
Nodules hard to treat because of:
1. position
a) high risk location
- adjacent large vessels: vena cava, first or second branch of the portal vein, the base of hepatic vein
- adjacent to extrahepatic organs: gallbladder, gastrointestinal tract
b) difficult-to-reach location
- I segment or liver dome
- behind large vessels
- behind TIPS
According to Teratani, nodules located less than 5mm from large vessels or extrahepatic organs were classified as high-risk location nodules. (Teratani T, Yoshida H, Shiina S, Obi S, Sato S, Tateishi R, Mine N, Kondo Y, Kawabe T, Omata M. Radiofrequency ablation for hepatocellular carcinoma in so-called high-risk locations. Hepatology. 2006 May;43(5):1101-8.) Therefore nodules adjacent to a first or second branch of the portal vein, the base of hepatic veins, or the inferior vena cava, while nodules adjacent to extrahepatic organs were defined as those located less than 5 mm from the heart, lung, gallbladder,right kidney, or gastrointestinal tract.
2. size
3. multifocality
Characteristics of laser ablation that favours this technique to treat HCC nodule located in difficult sites are:
- the use of thin needles;
- very precise deliver of energy;
- greatest flexibility;
- no heat sink effect.
We work in Dyes solution,we need to enhanced optical properties by make laser ablation of Ag in this dyes solution.
We work by laser ablation in liquids ,we need to add nano collide to Rhodamine dyes ,Are there any effects on optical properties.
Are there any papers ?
Hello experts,
I've tried to cut a project using SUS304 2B, but unfortunately the dross formation is rather critical and the dross formation. I've increase the focus distance but the result almost the same.
1.) As far I know that the shock wave mismatching can be avoided with the polished surface during laser ablation and 2.) to remove surface defects like pits, nicks, lines and scratches in order to avoid surface fatigue crack initiation.
Is there any more reasons? I feel that there are some more inputs..,
Hello
I'd like to measure laser ablation plasma using LP(Langmuir Probe).
Then, the LP's theory is based on Maxwell distribution.
However, some kind of laser ablation plasmas are not the distribution.
I have seen some papers about measurement of the parameters of the plasma using LP.
I'm wondering about the correctness of the results of these papers.
Please advise for this question.
(and please introduce any reference documents if you know)
Thanks.
Yuki Nakamura
I am investigating laser ablation in water with TiO2 nanoparticles, Usually I get a homogeneous blue colour afterwards, as expected. But sometimes the particles turn grey and aggregate compeltely at the bottom of he suspension. Has anybody experienced something similar?
I am doing Research on tin and tin oxide nanoparticles using laser ablation method in different liquids. I have varied the energy and fixed the time and wavelength. The XRD result shows different planes appear when i increased energy from 30 mJ to 60 mJ. The intensity is also varying. My EDX result shows that oxide ratio increases and tin ratio decreases with the increase of laser energy. However my XRD result shows opposite relation. I am uploading my result for samples prepared in ethanol....Please help me in understanding this result
I am doing research on tin and tin-oxide nanoparticle using laser ablation method and used de-ionized water, acetone, ethanol and methanol as liquid media. I have varied the energy from 60 to 240 mJ for de-ionized water however for other liquid varied it from 30 to 60mJ. The oxidation rate increases with the decreases in energy when liquid was de-ionized water whereas for other liquid its opposite occurs. Why these liquid behaving differently so?
In two different research paper i have studied that that there is a threshold of laser flunece after which laser interact more with the liquid which causes an increase in oxidation rate.
I am using laser ablation method to prepare tin and tin oxide nanoparticles. I have varied liquid media and laser energy. For de-ionized water I have observe a decrease in tin oxide ratio with an increase in tin ratio by increasing laser energy...But for acetone, ethanol and methanol its opposite is observed. For other media's it can be due to threshold fluence above which the laser interact more with liquid ..can the same reason valid for de-ionized water???
I am having splashing problem during my PLAL experiment, how I can reduce it?
I have used laser ablation method to prepare tin oxide nanoparticle. The UV-VIs absorbance spectrum show decay in absorbance concentration when i have changed energy from 60mJ to 180mJ
I am doing research on tin and tin oxide nanoparticles using laser ablation method.I have varied the liquid media from de-ionized water to acetone ,methanol and ethanol.The all the characterization results shows minimum oxide produced in case of ethanol compare to other......I have read somewhere that ethanol particles form a shell around the target material and stop its reaction with oxide....why this not happened in acetone and methanol?? Need your serious help
I have prepare nanoparticles using laser ablation in liquid media.Varied energy from 60 to 180 mJ.I have actually randomly selected a sample prepared at 180mJ and than check the absorbance after 15 days....The absorbance increased but band gap decreased. What does It show??? the decay in band gap surely means agglomeration of particles but how the absorbance increased
Please help me with this.....
I have used laser ablation method to prepare colloidal metal nanoparticles in different media, I need to know that information is obtained from the FTIR spectra, and the derivate of FTIR spectra? I could see changes in these spectra when changing medium, but these results can not be interpreted.
Is it possible that temperature of a solid with vaporization temperature of 500 C may shoot up to 1000 C when subjected to a laser?
i want to simulate nano second pulsed laser ablation of a material in water invironment with COMSOL package . but I don,t know how should enter pulse of laser and water . any one can gave me a simple example or some suggestion?
Direct after laser structuring I measure a capacity of 20nF between two areas, this phenomenon disappears after 24h. Has anyone an explanation of this phenomenon ?
I am producing tin and tin oxide nanoparticles using laser ablation method.I have used de-ionized water, methanol, ethanol and acetone as a liquid media for every liquid varied the energy. The X RD result shows maximum tin peaks while their is no consistency in Oxide peaks.One liquid shows Sn2O3 peaks while in other liquid SnO2 peaks are more dominant along with tin peaks.....Why different oxide peaks are appearing ?
I am doing research on nanoparticles using laser ablation method.I am varying different parameters and Xrd results show an increase in intensity with increase in laser fluence.
To study ablation resistance of a polymer nanocomposite material.
Research about quality investigation of laser processed silicon wafer.
I am doing my research on metal nanaparticles by using laser ablation in liquid.. I have observed a decrease in particle size with an increase in laser fluence.
I am doing my research on metal nanoparticles by using laser ablation in de-ionized water.The day i prepared my sample i did Uv-vis Characterization to determine the band gap.I placed the sample intact and than did the same characterization after 10 days and observed a decrease in band gap.The color of the sample also changes from grey to milky white.What might be the reason behind decrease in band gap?