title: Comparison of laser induced thermal fracture between polycrystalline ceramic and crystal Nd:YAG.
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 w0, 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).
authors.forename: Yu
authors.initials: Y
authors.lastname: Shen
authors.forename: Wen-bin
authors.initials: WB
authors.lastname: Liu
authors.forename: Nan
authors.initials: N
authors.lastname: Zong
authors.forename: Jiang
authors.initials: J
authors.lastname: Li
authors.forename: Yong
authors.initials: Y
authors.lastname: Bo
authors.forename: Xi-qi
authors.initials: XQ
authors.lastname: Feng
authors.forename: Fang-qin
authors.initials: FQ
authors.lastname: Li
authors.forename: Yu-bai
authors.initials: YB
authors.lastname: Pan
authors.forename: Ya-ding
authors.initials: YD
authors.lastname: Guo
authors.forename: Peng-yuan
authors.initials: PY
authors.lastname: Wang
authors.forename: Wei
authors.initials: W
authors.lastname: Tu
authors.forename: Qin-jun
authors.initials: QJ
authors.lastname: Peng
authors.forename: Jing-yuan
authors.initials: JY
authors.lastname: Zhang
authors.forename: Wenqiang
authors.initials: W
authors.lastname: Lei
authors.forename: Da-fu
authors.initials: DF
authors.lastname: Cui
authors.forename: Zu-yan
authors.initials: ZY
authors.lastname: Xu