Laser ablation of absorbing liquids

Golovlyov, V. V.; Letokhov, V. S.

doi:10.1007/bf00357385

Cited by 13 publications

(6 citation statements)

References 7 publications

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“…Thus, the photochemical ablation mechanism is verified for the ablation of liquid benzene derivatives. The present photochemical ablation falls in a new category and is distinguishable from other liquids ablation induced by explosive boiling or intense photoacoustic wave . Relevant to the present study, we have reported recently the mechanistic switching for solutions of benzene derivatives .…”

Section: Discussionsupporting

confidence: 51%

The 248-nm Excimer-Laser-Ablation Mechanism of Liquid Benzene Derivatives: Photochemical Formation of Benzyl Radical Leads to Ablation

et al. 1998

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The mechanism underlying 248-nm laser ablation of liquid benzene derivatives (alkyl benzenes, benzyl chloride, benzyl alcohol) was revealed by means of transient absorption spectroscopy. One characteristic in the present liquid system is that the ablation threshold can be correlated not to the boiling point at all but to the photochemical reactivity of β-bond cleavage. In the spectroscopic measurement, the benzyl-radical formation was confirmed upon ablation, and its concentration was quantitatively evaluated at the threshold. The obtained value was ∼0.05 M, which was almost common to all of the examined liquids. The result means that the present liquids, whose macroscopic physical properties such as surface tension do not differ too much from each other because of the analogous molecular structure, undergo the ablation when the radical concentration reaches the critical value of 0.05 M. This is the first demonstration for bridging a gap between microscopic photochemical process and macroscopic morphological change. The ablation behavior can be well interpreted in terms of the photochemical volume explosion.

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Section: Discussionsupporting

confidence: 51%

The 248-nm Excimer-Laser-Ablation Mechanism of Liquid Benzene Derivatives: Photochemical Formation of Benzyl Radical Leads to Ablation

et al. 1998

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“…The random distribution of ejected jets and of droplet sizes has been attributed to capillary wave generation at the surface in an ablation model proposed by Golovlyov and Letokhov. 78 This model is based on the assumption that the spectral components of the thermoelastic wave near the surface have independent and random phases resulting in an acoustic speckle pattern. It is not clear, however, how the initially coherent acoustic field of the thermoelastic source should result in such a random distribution.…”

Section: B Ablation Of Liquidsmentioning

confidence: 99%

Photomechanical Processes and Effects in Ablation

2003

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“…One candidate for a tentative explanation would be a contribution from a photoacoustic wave. 33 Such an effect has been reported to assist the pulsed laser ablation of an aqueous solution of CuCl 2 . In the present case, the absorption coefficient (R) is very high (3 × 10 4 cm -1 ) 34 compared to that of neat benzene (2 × 10 3 cm -1 ).…”

Section: Resultsmentioning

confidence: 97%

“…Other effects may also be involved in the present ablation. One candidate for a tentative explanation would be a contribution from a photoacoustic wave . Such an effect has been reported to assist the pulsed laser ablation of an aqueous solution of CuCl 2 .…”

Section: Resultsmentioning

confidence: 99%

Nonlinear Photophysics and Ablation of Liquid Naphthalene Derivatives: Fluence-Dependence of Luminescence Spectra upon 248 nm Laser Excitation

et al. 2003

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The ablation of liquid naphthalene derivatives (1-methylnaphthalene and 1-chloronaphthalene) induced by 248-nm pulsed excimer laser irradiation was investigated by means of a photoacoustic technique and by nanosecond time-resolved luminescence/absorption spectroscopy. Cavitation (ablation) was observed in both of the liquids when the laser fluence was increased beyond a certain threshold. During the photoacoustic measurements, the ablation threshold was evaluated to be 20 mJ/cm2 for both of the liquids. In the time-resolved luminescence spectroscopy, two spectral components were detected both above and below the threshold: the fluorescence of naphthalene monomers and the fluorescence of excimers. The former component is conspicuous in the later temporal stage after the excitation. One characteristic feature observed in the luminescence spectroscopy below the threshold region was that the ratio of the intensity of the monomer fluorescence to the excimer fluorescence increased with increasing laser fluence. This behavior, that is, the increase in the monomer component, was also induced by raising the temperature of the liquids. No chemical intermediates such as radicals (which would suggest photochemical fragmentation) were detected by the transient absorption spectroscopy during ablation. These results indicate that a photothermal effect is dominant for laser ablation in liquid naphthalene derivatives. The temperature at the ablation threshold was estimated on the basis of the intensity ratio of the monomer and excimer fluorescence components and the Boltzman equilibrium.

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Laser ablation of absorbing liquids

Cited by 13 publications

References 7 publications

The 248-nm Excimer-Laser-Ablation Mechanism of Liquid Benzene Derivatives: Photochemical Formation of Benzyl Radical Leads to Ablation

The 248-nm Excimer-Laser-Ablation Mechanism of Liquid Benzene Derivatives: Photochemical Formation of Benzyl Radical Leads to Ablation

Photomechanical Processes and Effects in Ablation

Nonlinear Photophysics and Ablation of Liquid Naphthalene Derivatives: Fluence-Dependence of Luminescence Spectra upon 248 nm Laser Excitation

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