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Research on Mechanism of Laser Damage Germanium Materials

Author: ZhangYuZuo
Tutor: ZhangXiHe
School: Changchun University of Science and Technology
Course: Optics
Keywords: Germanium Damage Threshold Stress Injury Damage mechanism
CLC: TN249
Type: Master's thesis
Year: 2010
Downloads: 125
Quote: 0
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Abstract


With Nd: YAG1064nm wavelength pulsed laser irradiation of germanium materials, for example , research germanium laser damage mechanism . Damage analysis of the use of laser damage morphology germanium material damage mechanism , and analyzes the germanium surface corrugation formation mechanism , obtained germanium material formed on the surface of the surface waviness rules germanium material damage is near the threshold . Application zero damage probability calculated germanium laser damage threshold of materials obtained with germanium laser parameters laser damage threshold of the relationship between the curves . Using the finite element method to heat conduction equation and the stress equilibrium equations are analytic calculation , obtained when irradiated germanium axial stress , radial stress and hoop stress equation , the results showed that: the axial stress germanium material , runoff stress , hoop stress , followed by increases. Hoop stress is caused by damage to germanium material stress is a major factor . Laser irradiation established thermal shock model germanium , germanium obtain a temperature distribution and stress distribution field , germanium obtained temperature distribution curve and the stress distribution curve, and according to the graph of the laser damage mechanism Germanium discussed.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Laser technology, the maser > Laser applications
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