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Proceedings Paper

Optical acoustic experimental investigation of propagation femtosecond laser radiation in air and biological tissues
Author(s): N. N. Bochkarev; A. M. Kabanov; E. S. Protasevich; A. N. Stepanov
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Paper 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, and 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 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.

Paper Details

Date Published: 19 February 2008
PDF: 8 pages
Proc. SPIE 6938, Atomic and Molecular Pulsed Lasers VII, 69380T (19 February 2008); doi: 10.1117/12.785647
Show Author Affiliations
N. N. Bochkarev, Institute of Atmospheric Optics (Russia)
A. M. Kabanov, Institute of Atmospheric Optics (Russia)
E. S. Protasevich, Institute of Atmospheric Optics (Russia)
A. N. Stepanov, Institute of Applied Physics (Russia)

Published in SPIE Proceedings Vol. 6938:
Atomic and Molecular Pulsed Lasers VII
Victor F. Tarasenko, Editor(s)

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