Title :
Continuous-Wave Frequency-Tunable Terahertz-Wave Generation From GaP
Author :
Nishizawa, Jun-ichi ; Tanabe, Tadao ; Suto, Ken ; Watanabe, Yusuke ; Sasaki, Tetsuo ; Oyama, Yutaka
Author_Institution :
Semicond. Res. Inst., Sendai
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
Keywords :
III-V semiconductors; gallium compounds; laser tuning; optical focusing; optical frequency conversion; optical pumping; phonons; polaritons; semiconductor lasers; submillimetre wave generation; submillimetre wave lasers; 0.69 to 2.74 THz; 600 GHz; GaP; Nd:YAG laser; YAG:Nd; YAl5O12:Nd; continuous-wave generation; difference-frequency generation; external cavity laser diode; frequency-tunable wave generation; incident beam focusing; laser diode pump; optical alignment; phonon-polariton excitation; power density; pump sources; single-frequency waves; terahertz waves; terahertz-wave generation; ytterbium-doped fiber amplifier; Diode lasers; Fiber lasers; Frequency; Laser beams; Laser excitation; Neodymium; Optical fiber amplifiers; Power amplifiers; Pump lasers; Stimulated emission; Continuous-wave (CW); GaP; frequency-tunable; phase matching; phonon–polariton; terahertz (THz)-wave;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2006.882278
