title: Ultraviolet Laser-induced ignition of RDX single crystal.
abstract: The RDX single crystals are ignited by ultraviolet laser (355 nm, 6.4 ns) pulses. The laser-induced damage morphology consisted of two distinct regions: a core region of layered fracture and a peripheral region of stripped material surrounding the core. As laser fluence increases, the area of the whole crack region increases all the way, while both the area and depth of the core region increase firstly, and then stay stable over the laser fluence of 12 J/cm(2). The experimental details indicate the dynamics during laser ignition process. Plasma fireball of high temperature and pressure occurs firstly, followed by the micro-explosions on the (210) surface, and finally shock waves propagate through the materials to further strip materials outside and yield in-depth cracks in larger surrounding region. The plasma fireball evolves from isotropic to anisotropic under higher laser fluence resulting in the damage expansion only in lateral direction while maintaining the fixed depth. The primary insights into the interaction dynamics between laser and energetic materials can help developing the superior laser ignition technique.
authors: School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, 610054, China.|Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109, USA.
authors: Zhonghua
authors: Z
authors: Yan
authors: Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China.
authors: Chuanchao
authors: C
authors: Zhang
authors: School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, 610054, China.|Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109, USA.
authors: Wei
authors: W
authors: Liu
authors: Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, China.
authors: Jinshan
authors: J
authors: Li
authors: Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, China.
authors: Ming
authors: M
authors: Huang
authors: School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, 610054, China.
authors: Xuming
authors: X
authors: Wang
authors: Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China.
authors: Guorui
authors: G
authors: Zhou
authors: Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, China.
authors: Bisheng
authors: B
authors: Tan
authors: Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, China.
authors: Zongwei
authors: Z
authors: Yang
authors: School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, 610054, China.
authors: Zhijie
authors: Z
authors: Li
authors: School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, 610054, China.
authors: Li
authors: L
authors: Li
authors: Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China.
authors: Hongwei
authors: H
authors: Yan
authors: Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China.
authors: Xiaodong
authors: X
authors: Yuan
authors: School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, 610054, China.
authors: Xiaotao
authors: X
authors: Zu