Research On Mechanism Of Laser Damage Germanium Materials

Take the Nd:YAG 1064nm pulse laser radiation germanium material as example, We research germanium material laser damage mechanism. We have analyzed the laser damage mechanism of the germanium material using the damage appearance and We have analyzed the germanium material surface ripple formation mechanism, We have obtained the germanium material surface formation rule ripple is in the vicinity of the germanium material damage threshold. We Using the zero damage probability method calculated the germanium material laser damage threshold and We have discussed the relations between laser parameter and the laser damage threshold. We have obtained the germanium material laser radiation equation of the axial stress,radial stress and the circle stress, Using the finite element method calculated the heat conduction equation and the stress balance equation. The result indicated: The germanium material axial stress,radial stress and circle stress increase in turn, Circle stress is the primary factor of the stress damage. We have established the thermal impact model of the laser radiation germanium material, We have obtained the germanium material temperature distribution curve and the stress distribution curve, Finally We have discussed the laser damage mechanism according to the curves of the germanium materials.