Ultrafast dynamics of photoexcited free carriers in CVD diamonds

Photorefractive Photonics 2017

Liu, Xiangming^1 ; Zhang, Ben^1 ; Zhong, Quanjie^1 ; Peng, Xiaoshi^1 ; Liu, Shenye^1

Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang

621900, China^1

关键词: Chemical vapor deposition diamond;    Femtosecond pump-probe techniques;    Free-carrier dynamics;    Non-linear optical properties;    Non-linear refraction;    Nonlinear absorptions;    Polycrystalline;    Ultra-fast dynamics;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/867/1/012013/pdf
DOI  :  10.1088/1742-6596/867/1/012013

来源: IOP

【 摘 要 】

We report on the experimental studies of the free-carrier dynamics and nonlinear optical properties in both bulk polycrystalline and single-crystal chemical vapor deposition (CVD) diamonds. The dynamics of nonlinear refraction and nonlinear absorption is measured by use of a time-resolved femtosecond pump-probe technique under UV excitation. Nonlinear refraction dynamics indicates a positive Kerr effect. Slow and fast components in nonlinear absorption transmittance are separated and used to determine the free-carrier lifetimes.