Chinese Optics Letters, 2018, 16 (9): 090401, Published Online: Sep. 6, 2018
A proposed approach for detecting terahertz pulses by using double few-cycle laser pulses with opposite carrier envelope phases Download: 831次
Abstract
Previous research shows that few-cycle laser (FCL) pulses with low energy and without a bias field can be used to coherently detect terahertz (THz) pulses. As we know, it is very difficult to stabilize the carrier envelope phase (CEP) of FCL pulses, i.e., there are some random fluctuations for the CEP. Here we theoretically investigate the influence of such instability on the accuracy of THz detection. Our results show that although there is an optimum CEP for THz detection, the fluctuations of the CEP will lead to terrible thorns on the detected THz waveform. In order to solve this problem, we propose an approach using two few-cycle laser pulses with opposite CEPs, i.e., their CEPs are differed by π .
Kejia Wang, Xinyang Gu, Zhenwei Zhang, Zhengang Yang, Jinsong Liu, Shenglie Wang. A proposed approach for detecting terahertz pulses by using double few-cycle laser pulses with opposite carrier envelope phases[J]. Chinese Optics Letters, 2018, 16(9): 090401.