Generation and spectral manipulation of coherent terahertz radiation with two-stage optical rectification.
We propose and experimentally demonstrate the generation of single-cycle terahertz radiation with two-stage optical rectification in GaSe crystals. By adjusting the time delay between the pump pulses employed to excite the two stages, the terahertz radiation from the second GaSe crystal can constructively superpose with the terahertz field injected from the first stage. The high mutual coherence between the two terahertz radiation fields is ensured with the coherent optical rectification process and can be further used to synthesize a desired spectral profile of coherent THz radiation. The technique is also potentially useful for generating high-power single-cycle terahertz pulses, usually limited by the pulse walk-off effect of the nonlinear optical crystal used.
Chen
Ching-Wei
CW
Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu, Taiwan 30010, ROC.
Lin
Yu-Shian
YS
Huang
Jung Y
JY
Chang
Chen-Shiung
CS
Pan
Ci-Ling
CL
Yan
Li
L
Lee
Chao-Kuei
CK
D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005708:Gallium / Q000737:chemistry*; D007259:Infrared Rays; D007368:Interferometry / Q000295:instrumentation*; D008029:Lighting / Q000295:instrumentation*; D008872:Microwaves; D008962:Models, Theoretical; D012031:Refractometry / Q000295:instrumentation*; D012643:Selenium / Q000737:chemistry*
C517764:gallium selenide; D005708:Gallium; D012643:Selenium