Acoustic experimental investigation of interaction femtosecond laser pulses with gas–aerosol media and biological tissues

N. N. Bochkarev; A. M. Kabanov; A. N. Stepanov

doi:10.1117/12.783061

14 February 2008 Acoustic experimental investigation of interaction femtosecond laser pulses with gas-aerosol media and biological tissues

N. N. Bochkarev, A. M. Kabanov, A. N. Stepanov

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Proceedings Volume 6936, Fourteenth International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics; 69360G (2008) https://doi.org/10.1117/12.783061
Event: Fourteenth International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics, 2007, Buryatia, Russian Federation

Abstract

Using two optical acoustic approaches we experimentally investigated spatial location of filament zone of propagation channel of focused laser radiation. For femtosecond pulses passing in air it was shown that nonlinear focus length had spatial scale of 1/P at initial power P moderate for self-focusing and at optical system focus distance significantly lower than Rayleigh beam length. The results of experimental optical acoustic investigation of femto- and nanosecond pulses attenuation by some biological tissues (muscular tissue, adipose tissue, cutaneous covering, milk) and optical breakdown thresholds on these one are presented. It was shown that penetration depth of short laser pulse radiation into biological tissues is the same as for longer one. However, amplitude of acoustic response to a process of interaction of femtosecond laser pulse with biological tissue is larger in several times than that to interaction with nanosecond pulses of the same power and spectral distribution. The obtained of threshold values can be interesting for tabulation of limit allowable levels of irradiation at work with laser radiation. Such values are unknown for femtosecond laser pulses today.

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N. N. Bochkarev, A. M. Kabanov, and A. N. Stepanov "Acoustic experimental investigation of interaction femtosecond laser pulses with gas-aerosol media and biological tissues", Proc. SPIE 6936, Fourteenth International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics, 69360G (14 February 2008); https://doi.org/10.1117/12.783061

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KEYWORDS

Acoustics

Tissues

Tissue optics

Femtosecond phenomena

Mirrors

Pulsed laser operation

Biomedical optics

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