Diagnostics of nanosecond dynamics of the plasma produced during KrF excimer laser ablation of zirconia in vacuum

Lim, Daniel; Mazumder, Jyoti

doi:10.1063/1.1483394

Cited by 14 publications

(8 citation statements)

References 32 publications

(24 reference statements)

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“…On the other hand, zirconium has a very rich atomic and ionic spectrum; this offers a chance to estimate the plasma electronic temperature based on the measured spectral lines intensities. A detailed analysis of this topic was carried out by Li et al 48 These authors investigated 39 spectral lines in the range from 450 to 500 nm and came to the conclusion that seven of them can be used for reliable determination of the plasma temperature. We extended the spectral region considering 45 relatively strong Zr(I) lines we measured between 420 and 516 nm.…”

Section: Determination Of Plasma Temperaturementioning

confidence: 99%

Spectroscopic Investigation of Direct Current (DC) Plasma Electrolytic Oxidation of Zirconium in Citric Acid

et al. 2014

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Plasma electrolytic oxidation of zirconium in citric acid was investigated using optical spectroscopy. A rich emission spectrum consisting of about 360 zirconium and 170 oxygen atomic and ionic lines was identified in the spectral regions 313-320, 340-516, and 626-640 nm. It was shown that the remaining features observed in the spectrum could be ascribed to various molecular species, which involve zirconium, oxygen, hydrogen, and carbon. The temperature of the plasma core (T = 7500 ± 1000 K) was determined using measured Zr line intensities, and the temperature of peripheral plasma zone (T = 2800 ± 500 K) was estimated from the intensity distribution within a part of an OH spectrum. The composition of the plasma containing zirconium, oxygen, and hydrogen, under assumption of local thermal equilibrium, was calculated in the temperature range up to 12,000 K and for pressure of 10(5) and 10(7) Pa, in order to explain the appearance of the observed spectral features.

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Section: Determination Of Plasma Temperaturementioning

confidence: 99%

Spectroscopic Investigation of Direct Current (DC) Plasma Electrolytic Oxidation of Zirconium in Citric Acid

et al. 2014

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“…Knowledge about the characteristics of the target material in the laser ablation step provides the key to an optimization of the laser parameters and target properties to achieve an elimination of particle ejection. Up to now, the few studies on the laser ablation characteristics of zirconiabased ceramics focus mainly on microstructuring aspects 23,24 or plasma diagnostics [25][26][27] and remain predominantly restricted to a single type of target, respectively laser source.…”

Section: Introductionmentioning

confidence: 99%

Laser ablation characteristics of yttria-doped zirconia in the nanosecond and femtosecond regimes

Heiroth

Koch

Lippert

et al. 2010

Journal of Applied Physics

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The laser ablation characteristics of yttria-stabilized zirconia ͑YSZ͒ have been investigated as a function of the target microstructure and dopant level for different nanosecond-͓ArF, KrF, and XeCl excimers; Nd:YAG ͑yttrium aluminum garnet͒ ͑fourth harmonic͔͒ and femtosecond-laser sources ͓Ti:sapphire ͑fundamental and third harmonic͔͒. Particle ejection, which compromises the quality of coatings prepared by pulsed laser deposition ͑PLD͒, was analyzed in detail. Nanosecond-laser pulses cause a severe thermomechanical surface cracking and exfoliation of micron-sized fragments on a microsecond to millisecond time scale in the case of 8 -9.5 mol % Y 2 O 3 -doped, fully stabilized zirconia ͑8YSZ and 9.5YSZ͒ targets. As a consequence of the intrinsic material brittleness, fully stabilized YSZ coatings deposited by PLD contained particles for all tested conditions. Lower doped partially stabilized zirconia ͑3YSZ͒ exhibits a superior fracture toughness attributed to a laser-induced partial transition to the monoclinic phase, detected by Raman spectroscopy, which enables the deposition of particle-free dense thin films by conventional PLD using nanosecond-UV laser radiation at moderate fluences of 1.2-1.5 J / cm 2 . The ablation dynamics of ultrashort laser pulses differ fundamentally from the nanosecond regime as evidenced, e.g., by time-resolved shadowgraphy and light scattering experiments. Femtosecond pulses prevent the exfoliation of micron-sized fragments but result invariably in a pronounced ejection of submicron particles. The resulting PLD coatings are porous and reveal a large surface roughness as they consist of an agglomeration of nanoparticles. Femtosecond-NIR pulses provide a factor of 2.5-10 higher material removal rates compared to nanosecond-and femtosecond-UV pulses. The ablation metrics, i.e., threshold fluence and effective absorptivity, mainly depend on the laser wavelength while the pulse duration, target microstructure, and dopant level are of minor importance. Evidence is presented that incubation effects play a significant role in nanosecond-and femtosecond-laser ablations of YSZ enabling material removal at comparatively low fluences for sub-bandgap photon energies.

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“…Popovic et al [13] studied the electron impact broadening effect in hot star atmospheres: the case of single and double ionized zirconium. Ping Li et al [14] presented the diagnostics of nanosecond dynamics of the plasma produced during KrF excimer laser ablation of zirconium in vacuum. P. Chapelle et al [15] presented the plasma diagnostic by emission spectroscopy during vacuum arc re-melting of zircaloy electrode.…”

Section: Lasers and Their Applicationsmentioning

confidence: 99%

Optical emission characterization of laser ablated zirconium plasma

Hanif

Salik

2015

Opt. Spectrosc.

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Optical emission characteristics of zirconium (Zr) plasma produced by the fundamental (1064 nm) and second (532 nm) harmonics of an Nd:YAG laser are studied. The temperature measurements have been estimated through the Boltzmann plot method whereas; number density is calculated using Stark broadening profile of 535.07 nm (5p 3 G → 5s 1 H) transitions. The variation in the temperature and number density at different laser irradiance has also been investigated using spectroscopic technique. It is observed that temperature and number density increases as laser irradiance is increased. The temperature is also calculated by varying distance from the target surface along the line of propagation of plasma plume.

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Diagnostics of nanosecond dynamics of the plasma produced during KrF excimer laser ablation of zirconia in vacuum

Abstract: Equivalent ion temperature in Ta plasma produced by high energy laser ablation J. Appl. Phys. 99, 083301 (2006); 10.1063/1.2189932Electronic temperature and density of the plasma produced by nanosecond ultraviolet laser ablation of LiF

Cited by 14 publications

References 32 publications

Spectroscopic Investigation of Direct Current (DC) Plasma Electrolytic Oxidation of Zirconium in Citric Acid

Spectroscopic Investigation of Direct Current (DC) Plasma Electrolytic Oxidation of Zirconium in Citric Acid

Laser ablation characteristics of yttria-doped zirconia in the nanosecond and femtosecond regimes

Optical emission characterization of laser ablated zirconium plasma

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