Amplification of up-converted THz pulse in Yb-doped optical fiber.

Dr. Nkeck Joel Edouard1, Mr. Gabriel Gandubert1, Mr. Sota Mine2, Prof. Kosuke Murate2, Dr. Xavier Ropagnol3,1, Prof. Francois Blanchard1
1Ecole de technologie superieure, Montreal, Canada. 2Nagoya University, Nagoya, Japan. 3INRS, Varennes, Canada


Using an ytterbium-doped fiber optic amplifier, we have improved the signal-to-noise ratio (SNR) of a terahertz (THz) pulse detection obtained by upconversion to an infrared (NIR) signal in a nonlinear lithium niobate crystal. This demonstration was carried out with a THz transmitter using a photoconductive antenna (PCA) and a femtosemcond laser oscillator. The geometrical separation between the signal and the optical pump easily enables unique amplification of the NIR signal to achieve an order-of-magnitude improvement in SNR.