| 摘要 |
Terahertz waves are generated by modulating the output of a cw laser to produce an optical signal with equally spaced frequency components. The modulated optical signal is supplied to a nonlinear optical waveguide in which it undergoes self-phase modulation, thereby producing at least two further frequency components that are separated by a desired frequency in the terahertz gap and have a sufficient magnitude. An optical filter selects the two frequency components, which are directed to a photomixer, that produces an electrical signal with the same frequency as the beat frequency. The photomixer is biased, and coupled to an antenna, so that the resulting electrical signal causes an electromagnetic wave having a frequency in the terahertz range to propagate from the antenna.
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