Open AccessFrequency tunable terahertz pulses generated from GaP waveguide emitter
Author(s) -
Feng Liu,
Yang Li,
Junkai Shi,
Xiaokun Hu,
Jiang Li,
Yanfeng Li,
Qirong Xing,
Minglie Hu,
Li Chai,
Qingyue Wang
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.61.034210
Subject(s) - terahertz radiation , common emitter , materials science , waveguide , optics , optoelectronics , amplifier , pulse duration , femtosecond , pulse (music) , dispersion (optics) , physics , laser , cmos , detector
We report on a frequency-tunable terahertz pulse train generated from a rectangular GaP waveguide emitter pumped by a pulse width tunable femtosecond photonic crystal fiber amplifier. The THz frequency can be tuned by varying the pump pulse duration. The dispersion of the emitter can be controlled via the geometry of the waveguide, and the coherent buildup length can be increased to scale up the output power. Waveguides with different cross sections can be used to tune the THz spectrum. Combined with the pump pulse duration tuning technique, THz pulses with a precisely tunable frequency can be obtained. In the experiment, tunable THz radiation is obtained from a GaP waveguide emitter with a cross section of 1 mm0.7 mm. Finally, a GaP emitter array is designed to achieve a wider tuning range.