Title :
Tunable terahertz generation at quasi-phase matching structures using femtoscond laser pulses
Author :
Yu, N.E. ; Kang, C. ; Jung, C. ; Kee, C.-S. ; Lee, Y.L. ; Yu, B.-A. ; Ko, D.-K. ; Takekawa, S. ; Kitamura, K. ; Lee, J.
Author_Institution :
Adv. Photonics Res. Inst., Gwangju Inst. of Sci. & Technol., Gwangju
Abstract :
We demonstrated tunable and narrow-band terahertz generation around l~3 THz via difference frequency generation (DFG) using femtosecond (fs) pulses in a periodically poled lithium niobate (PPLN) crystal and periodically poled stoichiometric lithium tantalate (PPSLT) crystal. Two different types of terahertz radiation, forward and backward, could be generated in the quasi-phase matching (QPM) structures by the DFG process. A broadband fs optical pulse contributes to the DFG process, which occurs between two different frequency components set of an ultrashort optical pulse within the frequency range and a terahertz frequency at the QPM structure. We observed a backward terahertz radiation at approximately 1.3 THz at PPLN crystal and the frequencies of terahertz radiations are easily controlled by varying the domain structures.
Keywords :
lithium compounds; optical pulse generation; submillimetre wave generation; LiNbO3; LiTaO3; backward terahertz radiation; difference frequency generation; domain structures; femtoscond laser pulses; forward terahertz radiation; frequency 1 THz to 3 THz; narrowband terahertz generation; periodically poled lithium niobate crystal; periodically poled stoichiometric lithium tantalate; quasi-phase matching structures; tunable terahertz generation; ultrashort optical pulse; Biomedical optical imaging; Crystals; Frequency; Nonlinear optics; Optical pulse generation; Optical pulses; Optical refraction; Optical sensors; Tunable circuits and devices; Ultrafast optics; difference frequency generation; periodically poled lithium niobate; quasi-phase matching; terahertz generation;
Conference_Titel :
Infrared and Millimeter Waves, 2007 and the 2007 15th International Conference on Terahertz Electronics. IRMMW-THz. Joint 32nd International Conference on
Conference_Location :
Cardiff
Print_ISBN :
978-1-4244-1438-3
DOI :
10.1109/ICIMW.2007.4516782