Featured customer: Physical Optics Corporation
Generation of wide terahertz radiation using bulk and quasi-phase-matched
GaAs crystal
Paper 7311-9 of Conference 7311
Date: Tuesday, 14 April 2009
Author(s): Baolong Yu, Naibing Ma, Min-Yi Shih, Alexander V. Parfenov, Physical
Optics Corp. (United States)
Physical Optics Corporation (POC) studied intense terahertz (THz) generation
through optical rectification in bulk low-temperature growth GaAs (LG-GaAs) and
quasi-phase-matched orientation pattern GaAs (OP-GaAs). POC performed
simulations based on one-dimensional coupled propagation equations of THz and
optical fields and conducted experimental tests. The results show that a LG-GaAs
crystal with 0.5mm-thick under the excitation of a compact all-fiber femtosecond
laser (76 MHz, 100 fs, 100 mW, 800 nm) can generate wide frequency range from
0.1 to 8.2 THz. The enhanced conversion efficiency was found for OP-GaAs crystal
that can generate an average THz power of several milliwatts. Both theoretical
and experimental results show that average THz output power is proportional to
the energy fluence of the excitation source rather than the laser power for
ultra-short pulse source. These achievements provide an effective approach to
increase THz output power.
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We offer femtosecond oscillators and amplifiers based on Ti:Sapphire (Trestles,
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microfluidic devices, glass MEMS, inscription of FBG fiber Bragg gratings,
stand-off detection using filament-induced breakdown spectroscopy LIBS, optical
sensing, plasma generation, 3D optical fabrication, optical memory recording,
generation of wide terahertz THz radiation, spectroscopy, microscopy and
imaging.