The effect of optical limiting is investigated in the suspensions of carbonudmicroparticles in aqueous gelatin gel and epoxy resin. Both transient and permanentudchanges of optical transmittance are observed after the irradiation by a Q-switchedudYAG:Nd³⁺ laser pulses. The experimental results are explained with taking into accountudthe formation of micro-bubbles filled with water steam and with gaseous products ofuddecomposition of the matrix. In the epoxy resin suspensions, the laser-induced permanentudchanges of transmittance are caused by pyrolysis of epoxy oligomers in the vicinity ofudlaser-heated carbon particles.
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