Comparison of laser induced thermal fracture between polycrystalline ceramic and crystal Nd:YAG
The Optical Society
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).
Shen, Yu, Wen-bin Liu, Nan Zong, Jiang Li, Yong Bo, Xi-qi Feng, Fang-qin Li, Yu-bai Pan, Ya-ding Guo, Peng-yuan Wang, Wei Tu, Qin-jun Peng, Jing-yuan Zhang, Wenqiang Lei, Da-fu Cui, Zu-yan Xu.
"Comparison of laser induced thermal fracture between polycrystalline ceramic and crystal Nd:YAG."
The Optical Society, 39 (7): 1-3.