A reverse saturable absorption material of phthalocyalne indium was prepared by the method of injection molding．From the SEM analysis of the cross section of the sample

we could judge the dispersion of phthalocyalne indium in PMMA matrix A UV-Vis spectrophotometer (UVl240) was used to test the UV-Visible spectrum of sample．The sample showed the typical absorption of Q-region at 620 nm to 730nm wavelength．There was a wide non-resonance area at 480 nm to 570 nm wavelength

and the phenomenon of reverse saturable absorption occurred accordingly An ns/ps Nd：YAG pulsating laser device was used to test the characteristic ryeverse saturable absorption of the sample The limited threshold of the sample reached 68.5 mJ/cm2

its dynamic range was 1.07 and the damage threshold was more than 1200 mJ/cm2．