Journal
LASER & PHOTONICS REVIEWS
Volume 2, Issue 1-2, Pages 11-25Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.200710028
Keywords
terahertz; T-ray; frequency down-conversion; quasi-phase matching; gallium arsenide; optical parametric oscillator; synchronous pumping
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We overview methods of THz-wave generation using frequency down-conversion in GaAs with periodically-inverted crystalline orientation. First, we compare different nonlinearoptical materials suitable for THz generation, analyze THz generation process in quasi-phase-matched crystals and consider theoretical limits of optical-to-THz conversion. Then, we review single-pass optical rectification experiments with feratosecond pump pulses, performed in periodically-inverted GaAs, where monochromatic THz output tunable in the range 0.9-3 THz was produced. Finally, we describe a novel approach to create a compact highly efficient tunable (0.5-3.5 THz) room temperature monochromatic THz source, based on the concept of intracavity THz generation via resonantly-enhanced difference frequency mixing. This approach allowed generating of 1 mW of average THz power, potentially scalable to 10-100 mW.
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