The laser induced glass bulk damage morphology has been analyzed quantitatively

and the size and classification of the damage are obtained by using the image processing technology based on the improved watershed segmentation algorithm. The physical meaning and application of each processed image are analyzed in detail based on the interaction mechanism between the laser-induced plasma shock waves and the glass. The results show that the gradient picture can reflect the shape and distribution of a crack

the shade of the image gray aftering filter can reflect the degree of the damage

the marker picture of object region can reflect the region of the damage

and the final segmentation result owns all the characteristics above and can fully reflect all information mentioned above. Furthermore

each area is analyzed of the light of the final segmentation images. The analysis results show that the ratios of the filamentary of plasma channel

the fusion range and the region of varying refractive index to the entire analyzed area are about 15％

55％ and 30％

respectively.The result implies that laser energy is deposited into the small range of filamentary of plasma channel firstly; Following that

the plasma expands outward because of the high temperature and extreme pressure to form a large fusion range; With the increase of the distance from the centerline

the pressure of the laser plasma shock wave will reduce rapidly and the region of varying refractive index is formed.