Title :
Noncollinear Electro-Optic Sampling of Terahertz Waves in a Thick GaAs Crystal
Author :
Mashkovich, Eugene A. ; Shugurov, Alexander I. ; Ozawa, Shipei ; Estacio, Elmer ; Tani, Masahiko ; Bakunov, Michael I.
Author_Institution :
Gen. Phys. Dept., Univ. of Nizhny Novgorod, Nizhny Novgorod, Russia
Abstract :
In this paper, we propose and experimentally demonstrate noncollinear EO sampling of terahertz pulses with a femtosecond fiber laser in cm-thick GaAs crystals. This technique provides more than an order of magnitude improvement in spectral resolution and a significant increase in efficiency as compared to previously used collinear EO sampling in mm- and sub-mm-thick GaAs crystals. The optimal incidence angle of the probe beam on the crystal is found to be 42 °-50 ° and the optimal crystal thickness is ~ 1-3 cm.
Keywords :
III-V semiconductors; electro-optical effects; gallium arsenide; high-speed optical techniques; terahertz waves; GaAs; femtosecond fiber laser; noncollinear EO sampling; noncollinear electrooptic sampling; optimal incidence angle; spectral resolution; terahertz waves; Crystals; Electrooptical waveguides; Gallium arsenide; Laser beams; Optical beams; Optical pulses; Probes; GaAs; Terahertz detection; electro-optic sampling; noncollinear;
Journal_Title :
Terahertz Science and Technology, IEEE Transactions on
DOI :
10.1109/TTHZ.2015.2461439
