Title

Comparison of laser induced thermal fracture between polycrystalline ceramic and crystal Nd:YAG

Document Type

Article

Publication Date

2014

Publication Title

The Optical Society

DOI

10.1364/OL.39.001965

Abstract

Continuous wave 808 nm pump laser-induced thermal damage of polycrystalline transparent ceramic and crystalline Nd:YAG materials was investigated both experimentally and theoretically. The measured temperature agrees well with the theoretical simulation, and the maximum hoop stresses occur on the incident facet of the end-pumped rod at about 2√ times of the pump beam radius �0, where the temperature gradient is the highest and the damage occurs first at this location. The fracture-limited laser intensity of ceramics was experimentally measured to be 6.4±0.6  kW/cm2, nearly 64% higher than that of the crystals (3.9±0.3  kW/cm2). The deduced thermal fracture stress for ceramic was 386±50  MPa, which is 64% higher than that of the crystals (235±16  MPa).

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