Surface stability under pulsed laser ablation

Vitali I. Konov; Vladimir N. Tokarev

doi:10.1117/12.147683

7 July 1993 Surface stability under pulsed laser ablation

Vitali I. Konov, Vladimir N. Tokarev

Proceedings Volume 1882, Laser-Tissue Interaction IV; (1993) https://doi.org/10.1117/12.147683
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

High quality (precise) laser ablative processing of materials, e.g. cutting of polymers or biotissues, is characterized by smooth bottom and edges of a crater and absence of droplets, expeffing from the irradiation zone. Until recently, the experimental realization of the above mentioned conditions has been achieved mostly with excimer lasers. The most popular 'chanism of precise organic material removal is photoablation, but it can be applied only to the case of UV radiation. Though recently, quite good quality tissue cuttin was obtained also by means of erbium (X =2.94 m) laser. In both cases we have laser radiation with relatively short pulse duration r 1O s and high absorption coefficients (a 1O"10 cm-i) in biotissues, but for excimer lasers radiation absorption takes place mostly in biomolecules while for erbium laser energy is deposited in water. That is why it could be quite natural to consider thermal mechanisms of precise tissue ablation. We believe that surface thermal stability under intense laser heating is a key factor which determines surface quality after material ablation. Really, numerous experiments with melting, ablation, laser induced chemical reaction on irradiated solid surfaces (metals, dielectrics, semiconductors) have shown that after sufficiently long heat treatment by CW radiation or by multiple pulse action various types of surface reliefs can be formed. In fact, one of the problems in laser materials processing is to find radiation parameters (wavelength, irradiation time or pulse number, intensity, spot size and beam polarization) when surface reliefs are not formed. Typically, under multiple pulsed action such reliefs show essential degree of order and. are called surface structures (see, e.g. [1]).

Citation Download Citation

Vitali I. Konov and Vladimir N. Tokarev "Surface stability under pulsed laser ablation", Proc. SPIE 1882, Laser-Tissue Interaction IV, (7 July 1993); https://doi.org/10.1117/12.147683

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