Explosive phase transformation in excimer laser ablation - .. - excimer laser ablation processes diagram ,P –T diagram near the critical point.. ture is below the boiling temperature.. At the boiling temperature, .. excimer laser ablation process.. A KrF excimer laser with a wavelength of 248 nm and a pulse width of 26 ns full width at half maximum, FWHM is used.. .. y2 ..US4785806A - Laser ablation process and apparatus - Google .. A process and apparatus for ablating atherosclerotic or tumorous tissues is disclosed.. Optical fibers direct low power light energy at a section of tissue to be ablated to cause the section to fluoresce.. The fluorescence pattern is analyzed to determine whether the fluorescence frequency spectrum is representative of normal or abnormal tissue..
2 shows the energy level diagram of excimer laser8.. 4.. APPLICATIONS UV excimer lasers have emerged as the enabling tool .. material in a process called photo ablation.. With short laser pulses, this can be a relatively cold process with little or no effect This ..
Figure 2.. Beam delivery system schematic for excimer laser ablation III.. EFFECT OF FILLER SIZE ON TRENCH FORMATION First, samples were prepared with dry film lamination on glass or FR-4 core materials.. ABF films (15 µmthick GX92 and GY50) were
Exploring the process.. Excimer micromachining processes typically use ablation technology to remove material from the substrate.. Ablation occurs when the laser beam's intensity passes a threshold value that depends on the material to be ablated and the wavelength of the laser (see table).. Figure 1: The advantages of the projection ablation ..
Though laser based micro machining of polymer, by and large, is a cold ablation process, photo thermal process associated with the laser heating may affect the surface characteristics.. This chapter starts with an introduction to various excimer laser sources and proceeds to micromachining application areas with specific reference to polymers..
Excimer laser ablation process control of multilaminate materials Download PDF Info Publication number US20010023860A1 US20010023860A1 US09/863,215 US86321501A US2001023860A1 US 20010023860 A1 US20010023860 A1 US 20010023860A1 US ..
Excimer laser ablation process control of multilaminate materials Download PDF Info Publication number US20010023860A1 US20010023860A1 US09/863,215 US86321501A US2001023860A1 US 20010023860 A1 US20010023860 A1 US 20010023860A1 US ..
2 shows the energy level diagram of excimer laser8.. 4.. APPLICATIONS UV excimer lasers have emerged as the enabling tool .. material in a process called photo ablation.. With short laser pulses, this can be a relatively cold process with little or no effect This ..
An excimer laser's wavelength depends upon its laser medium gases, while the wavelength in turn determines the laser's applications.. For example, a 308 nm XeCl laser is most effective in skin surgery applications, while a 193 nm ArF device is commonly used in eye surgery.. Laser type.. Noble gas.. Halogen..
An excimer laser, sometimes more correctly called an exciplex laser, is a form of ultraviolet laser which is commonly used in the production of microelectronic devices, semiconductor based integrated circuits or "chips", eye surgery, and micromachining.. Since 1960s excimer lasers are widely used in high-resolution photolithography machines, one ..
This makes laser ablation very attractive for.. | Excimer Lasers, Laser Ablation and Ablation | ResearchGate, the professional network for scientists.. FIG 4 - uploaded by Peter Van Daele Content ..
A pulsed beam from an excimer laser is used for precision ablation of cadmium telluride (CdTe) and other materials to fabricate and delineate devices in electronic microcircuit structures.. The fluence of the beam may be adjusted to selectively remove one constituent of the material, such as cadmium vs.. tellurium, at a higher rate than the other constituent, while maintaining the integrity of ..
excimer laser ablation process.. A KrF excimer laser with a wavelength of 248 nm and a pulse width of 26 ns full width at half maximum, FWHM is used.. .. The laser fluence is varied from 2..5 J cmy2 to 10..5 J cmy2.. A 99..94% pure nickel specimen is used as the
The characteristics of excimer lasers and the nature of ablation and etching processes are described.. The two kinds of laser ablation mechanisms, thermal and electronic, are discussed.. Thermal processes all rely on an intense laser pulse to heat a surface very rapidly.. Electronic mechanisms do not rely on heating.. Two of these quantum-type processes have been discussed widely.. In the first ..
UV pre-ionized discharge pumped excimer (XeCl) laser systems with ∼100 mJ output pulse energy and ∼100 Hz rep-rate with good beam quality are most popular for in-house material processing, dye ..
Most commercial excimer lasers operate with electrode spacings of 2 to 3 cm, breakdown voltage of 25-35 KV and specially profiled electrodes for homogeneous discharge.. Some of the advantageous features of excimer laser include good energy conversion efficiency, pulse-to-pulse reproducibility and the higher average power make these laser techniques promising in large-area material processing..
Excimer lasers are a family of high pressure, pulsed gas lasers that produce intense ultraviolet (UV) light with high efficiency and high peak power at several useful wavelengths.. The source of the emission is a fast electrical discharge in a high pressure mixture of a rare gas and a halogen gas.. The specific combination of the rare gas and the ..
Excimer laser ablation—the direct etching of material by pulsed ultraviolet light—has been the subject of sustained research activity since the early 1980s, when the technique was first demonstrated..1,2 The ablation process is character-ized by the pulse-by
A pulsed beam (14) from an excimer laser (10) is used for precision ablation of cadmium telluride (CdTe) and other material (16) to fabricate and delineate devices in electronic microcircuit structures.. The fluence of the beam may be adjusted to selectively remove ..
The excimer laser is the powerful light source in the ultraviolet (UV) region of the electromagnetic spectrum.. The term excimer is the short form of excited dimer means a molecule formed by combining two identical noble gas ( i..e.. Argon, Krypton, Xenon ) atoms in the excited state.. Examples of excimers laser are Ar* 2 Kr* 2 Xe* 2..
21 At some point, the ablation rate reaches satu-ration and is not rising anymore [3]..This effect can be observed, if the focus of the laser is intentionally de-focused like shown in Figure 4.. The ablation rate is going into saturation for a focus of +60µm.. In Figure 3 can
The excimer laser is the powerful light source in the ultraviolet (UV) region of the electromagnetic spectrum.. The term excimer is the short form of excited dimer means a molecule formed by combining two identical noble gas ( i..e.. Argon, Krypton, Xenon ) atoms in the excited state.. Examples of excimers laser are Ar* 2 Kr* 2 Xe* 2..
Laser ablation provides superior control on evaporation due to its fast evaporation process.. Laser ablation combined with inert gas condensation attracted a wide range of attention for synthesizing a large quantity of nanocrystalline.. Schematic representation of a typical laser ablation is presented in Fig.. 6..3..
The ablation process for polymer waveguides using excimer laser is intricate involving several process parameters and material properties.. Some researchers have suggested using techniques of soft computing to deal with these complexities [ 6 , 8 – 10 ]..
Though laser based micro machining of polymer, by and large, is a cold ablation process, photo thermal process associated with the laser heating may affect the surface characteristics.. This chapter starts with an introduction to various excimer laser sources and proceeds to micromachining application areas with specific reference to polymers..
