Chinese Optics Letters, 2014, 12 (8): 083201, Published Online: Jul. 31, 2014
Frequency spectrum characterization of terahertz emission from laser-induced air plasma Download: 790次
Abstract
Terahertz (THz) emission from laser-induced air-plasma is presented. The frequency spectra of THz wave are investigated using an air-biased-coherent-detection method. The frequency spectra are measured under different pump-pulse and probe-pulse energies. The frequency spectra become narrow with the increasing pump power and we speculate it caused by collision behavior. Meanwhile, the bandwidth of the frequency spectra is broadened by the increasing probe power, which can be explained by pulse compression. Based on this finding, the optimal frequency spectrum of THz can be achieved by regulating the probe and pump beam.
Ji Zhao, Liangliang Zhang, Yiman Luo, Tong Wu, Cunlin Zhang, Yuejin Zhao. Frequency spectrum characterization of terahertz emission from laser-induced air plasma[J]. Chinese Optics Letters, 2014, 12(8): 083201.