Propagation and Amplification of a Short Subterahertz Pulse in a Plasma Channel in Air Created by Intense Laser Radiation Topics: High Intensity Lasers and High Field Phenomena; Nonlinear Optics; Plasma Technologies In Proceedings of 2nd International Conference on Photonics, Optics and Laser Technology PHOTOPTICS - Volume 1, 199-204, 2014 , Lisbon, Portugal