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    • Methods and apparatus for generating terahertz radiation 

      Belkin, Mikhail A.; Capasso, Federico; Belyanin, Alexey (United States. Patent and Trademark OfficeTexas A&M University. Libraries, 2011-07-05)
      Apparatus and methods for generating radiation via difference frequency generation (DFG). In one exemplary implementation, a quantum cascade laser (QCL) has a significant second-order nonlinear susceptibility (χ(2)) ...