T. Tanabe, S. Ragam, Y. Oyama, T. Sasaki, J. Nishizawa, M. Ohkado N. Yamada “Two-directional CW THz Wave Generation System by Pumping With a Single Fiber Amplifier of Near-IR Lasers” IEEE Photonics Technology Letters 21 (2009) 260-262. 2009.02.15