Two-Directional CW THz Wave Generation System by Pumping With a Single Fiber Amplifier of Near-IR Lasers

We constructed a two-directional continuous-wave (CW) terahertz (THz) wave generation system with laser diode pumping. The generation method is based on difference frequency generation (DFG) of two near-infrared (NIR) lasers by excitation of phonon polaritons in a GaP crystal. The two NIR lasers for...

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Bibliographic Details
Published in:IEEE photonics technology letters 2009-02, Vol.21 (4), p.260-262
Main Authors: Tanabe, T., Ragam, S., Oyama, Y., Sasaki, T., Nishizawa, J.-i., Ohkado, M., Yamada, N.
Format: Article
Language:English
Subjects:
Amplifiers
Beams (radiation)
Continuous-wave (CW)
Crystal surfaces
Crystals
Diode lasers
fiber amplifier (FA)
Fiber lasers
Fibers
Frequency
GaP
Laser beams
Laser excitation
Lasers
Optical fiber amplifiers
Optical surface waves
phase matching
Phonons
Pump lasers
Pumping
Surface emitting lasers
terahertz (THz)
Wave generation
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Summary:We constructed a two-directional continuous-wave (CW) terahertz (THz) wave generation system with laser diode pumping. The generation method is based on difference frequency generation (DFG) of two near-infrared (NIR) lasers by excitation of phonon polaritons in a GaP crystal. The two NIR lasers for DFG are amplified simultaneously using one ytterbium-doped fiber amplifier (FA). Efficient beam overlapping of the NIR lasers was achieved on the GaP crystal surface. This system consists of a simple optical design with a single FA. Narrow linewidth CW THz waves, which are generated in two directions, can be applied to high-resolution spectroscopy.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2008.2010716