  In the present work we have studied the possibility of laser welding and
ablation of biological tissue by the using of spherical metal nanoparticles
(NPs) and infrared laser irradiation which spectrally located far from plasmon
resonances. YAG:Nd laser with 1064 nm wavelength, 8 ns pulse duration, and
operating in transverse electromagnetic modes TEM$_{00}$ was used for the
synthesis of metal NPs. The Au,Ti Ni and Cu as well as Au-Ag and Au-Cu hybrid
metal NPs were formed in the liquid medium. Effectiveness of laser ablation in
the case of the biotissue sample that stained with the metal NPs was
approximately on 4-5 times larger than for the native sample. Also the scheme
of a laser point welding for the deep-located biotissue layer selectively
stained by the metal NPs has been demonstrated.
