Abstract-Phase dependence of the generation of terahertz waves from two-color laser-induced gas plasma

Houmei Dai^1,2 and Jinsong Liu¹
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¹ Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
² Department of Applied Physics, Wuhan University of Science and Technology, Wuhan 430081, People's Republic of China 
http://m.iopscience.iop.org/2040-8986/13/5/055201?rel=ref&relno=6

A transient photocurrent model is used to explain terahertz emission from gas plasma irradiated by two-color laser pulses, with one the second harmonic of the other. In this optical process, the relative phase between the two fields is very critical to the terahertz generation efficiency. In order to find out the optimal phase, many cases with relative phase from − π/2 to π/2 are studied. Results show that the case at π/4 can obtain the largest intensity.