Laser-induced expansion and ablation mechanisms of organic materials

Hosokawa, Yoichiroh; Mito, Takashi; Tada, Toshiko; Asahi, Tsuyoshi; Masuhara, Hiroshi

doi:10.1117/12.456806

Cited by 5 publications

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“…As a breakthrough technique to enhance nucleus generation by light irradiation, we are interested in applying a femtosecond laser, the peak intensity of which is above gigawatt and which induces strong nonlinear optical and photochemical effects, for example, discrete etching, ultrafast melting, shock wave generation, and multiphoton ionization. − These effects characteristic of a femtosecond laser indicate that the solution absorbs the light of the femtosecond laser in a very short time by multiphoton absorption even if the solution has no one-photon absorption. The multiphoton absorption and the following energy conversion processes will initiate perturbations to induce crystallization.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond Laser-Induced Crystallization of 4-(Dimethylamino)-N-methyl-4-stilbazolium Tosylate

Hosokawa

Adachi

Yoshimura

et al. 2005

Crystal Growth & Design

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A femtosecond laser pulse was irradiated to a supersaturated methanol solution of an organic molecule, 4-(dimethylamino)-N-methyl-4-stilbazolium tosylate (DAST), and its efficient crystallization was demonstrated under concentration and temperature conditions where spontaneous crystallization does not occur. The efficiency was higher than that using a nanosecond laser, and the nucleation depended on the laser repetition rate. The results suggest that the nucleation is trigged by cluster formation, which is ascribed to femtosecond laser irradiation effects, such as shock wave generation due to the ablation of the medium and an optical pressure due to the strong electric field.

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Section: Introductionmentioning

confidence: 99%

Femtosecond Laser-Induced Crystallization of 4-(Dimethylamino)-N-methyl-4-stilbazolium Tosylate

Hosokawa

Adachi

Yoshimura

et al. 2005

Crystal Growth & Design

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“…Considering the possibility of the relief structure formation by laser ablation process, as reported in the works by using short‐pulse KrF laser, it should be noted that the laser fluence used in this work is relatively quite low in comparison with the cases of laser ablation in organic materials and polymers . Moreover, in comparison with the works using a short‐pulse KrF laser that operates in the deep UV region at 248 nm, the laser wavelength in this work is 355 nm, which is out of the absorption band of this hybrid polymer gel.…”

Section: Resultsmentioning

confidence: 99%

Distributed feedback grating fabricated from hybrid polymer precursor gel by employing short‐pulse laser interference for photopumped polymer laser applications

Hidayat

Fitrilawati

et al. 2011

Polymers for Advanced Techs

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The application of hybrid polymer precursor gel for distributed feedback (DFB) grating laser fabricated by short‐pulse laser interference has been investigated. The precursor gel was prepared by sol–gel process from siloxane‐modified methacrylate monomer. The molecular structure characterization results show the formation of inorganic networks within the precursor gel, which further undergoes the formation of organic–inorganic polymer network by photopolymerization. The laser interference was performed by using the frequency‐tripled output of nanosecond Nd–YAG laser. The fabricated DFB gratings exhibit photopumped lasing actions with high consistency between the grating periodicity (between 380 and 1030 nm) and the lasing wavelength, which appears at the wavelength of the second‐order Bragg reflection. The atomic force microcopy measurements clearly show the formation of surface relief (corrugated) structure in those gratings. The mechanism of surface relief formation is attributed to a fast photo‐induced swelling process, which is unique property belonging to this kind of hybrid polymer precursor gel. Copyright © 2011 John Wiley & Sons, Ltd.

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“…For femtosecond resonant studies, morphological changes such as the fracture and destruction of anthracene microcrystals on a quartz substrate (threshold ∼40 mJ cm -2 ) have been observed under the microscope (resonant, 390 nm, 150 fs). 10 On the other hand, few studies have been carried out regarding femtosecond nonresonant ablation of organic solids. Multistep discrete etching has been achieved by two-photon ablation of amorphous organic film (780 nm, 150 fs).…”

Section: Introductionmentioning

confidence: 99%

“…Photothermal (heating by the relaxation of excited states followed by melting and boiling) and photochemical (expand the bulk by the formation of radicals and low molecular weight gases) mechanisms were proposed as the origin of ablation. For femtosecond resonant studies, morphological changes such as the fracture and destruction of anthracene microcrystals on a quartz substrate (threshold ∼40 mJ cm −2 ) have been observed under the microscope (resonant, 390 nm, 150 fs) . On the other hand, few studies have been carried out regarding femtosecond nonresonant ablation of organic solids.…”

Section: Introductionmentioning

confidence: 99%

Ionization of Anthracene Followed by Fusion in the Solid Phase under Intense Nonresonant Femtosecond Laser Fields

Yatsuhashi

Nakashima

2009

J. Phys. Chem. C

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Fused anthracene cation and a series of anthracene−C n H m cluster-like products were observed on irradiation with nonresonant femtosecond pulses at 1.4 μm. Ionization of polycrystalline anthracene revealed strikingly different features such as the absence of multiply charged molecular ions, the appearance of H+ and C+ at low intensity without the formation of C n H m fragment ions, C n H m -attached and detached molecular ions, and multimer cation formation, compared with the gas-phase experiments. The fusion reactions of anthracene and C n H m fragments indicated the presence of novel reactions among high-density cations in the crystal produced by femtosecond laser irradiation.

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Laser-induced expansion and ablation mechanisms of organic materials

Cited by 5 publications

References 0 publications

Femtosecond Laser-Induced Crystallization of 4-(Dimethylamino)-N-methyl-4-stilbazolium Tosylate

Femtosecond Laser-Induced Crystallization of 4-(Dimethylamino)-N-methyl-4-stilbazolium Tosylate

Distributed feedback grating fabricated from hybrid polymer precursor gel by employing short‐pulse laser interference for photopumped polymer laser applications

Ionization of Anthracene Followed by Fusion in the Solid Phase under Intense Nonresonant Femtosecond Laser Fields

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