Abstract-Role of resonance absorption in terahertz radiation generation from solid targets

Chun Li, Yun-Qian Cui, Mu-Lin Zhou, Fei Du, Yu-Tong Li, Wei-Min Wang, Li-Ming Chen, Zheng-Ming Sheng, Jing-Long Ma, Xin Lu, and Jie Zhang  »View Author Affiliations

http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-10-11797

Optics Express, Vol. 22, Issue 10, pp. 11797-11803 (2014)
http://dx.doi.org/10.1364/OE.22.011797

The interaction of 100-fs laser pulses with solid targets at laser intensities 10¹⁶-10¹⁸ W/cm² has been investigated experimentally by simultaneous measurements of terahertz (THz) and second harmonic signals. THz yield at the front side of the target, which rises from the self-organized transient electron currents along the target surface, is found scaling linearly with the laser intensity basically. Measurements of specularly reflected light spectrum show clear evidence of resonance absorption. The positive effects of resonance absorption on surface current and THz radiation generation have been confirmed by two-dimensional (2D) particle-in-cell (PIC) simulations and angular-dependent experiments, respectively.

© 2014 Optical Society of America