Experimental study of optical gas-dynamic processes of polymeric material ablation by ultrashort laser pulses |
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Authors: | E. Yu. Loktionov A. V. Ovchinnikov Yu. Yu. Protasov D. S. Sitnikov |
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Affiliation: | 1.Bauman State Technical University,Moscow,Russia;2.Joint Institute of High Temperatures,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | Optical gas-dynamic processes occurring in polymeric targets ((CH2O) n , (C2F4) n ) exposed to ultrashort laser pulses (τ 0.5 ∼ 45 − 70 fs; λ I,II,III = 266, 400, 800 nm; and E/S ∼ 0.1 − 40 J/cm2 at r 0 ∼ 20 μm) were studied under normal conditions and in vacuum (p ∼ 10−2 Pa). The dynamics of the mass flow from the target surface (m′ ∼ 10−5 − 10−4 g/J) was studied and the spectral-energy thresholds of laser ablation, the electron density distribution (n e ∼ 1014 − 1018 cm−3), the mass-averaged velocity of the material flow from the target surface (∼ 103 m/s), and the chemical composition and average temperature in the near-surface plasma formation (T ∼ 5000 K) were determined using interference microscopy, emission spectroscopy, and shadowgraphy. |
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