Continuous-Wave Frequency-Tunable Terahertz-Wave Generation From GaP

Nishizawa, J. Tanabe, T. Suto, K. Watanabe, Y. Sasaki, T. Oyama, Y.

This paper appears in: Photonics Technology Letters, IEEE
Publication Date: Oct.1, 2006
Volume: 18, Issue: 19
On page(s): 2008- 2010
ISSN: 1041-1135
Digital Object Identifier: 10.1109/LPT.2006.882278
Posted online: 2006-10-23 09:26:27.0



Abstract
Continuous-wave (CW) single-frequency terahertz (THz) waves were generated using difference-frequency generation via excitation of phonon–polaritons in GaP. The two pump sources were an external cavity laser diode (LD) and an LD-pumped Nd : YAG laser. The power density of the latter beam was enhanced by using a ytterbium-doped fiber amplifier. The two incident beams were focused to near the wavelength of THz waves. This optical alignment enabled us to generate frequency-tunable CW THz waves in the 0.69–2.74 THz range. With a fixed angle between the pump beams, we obtained a frequency bandwidth as large as 600 GHz.