Tunable terahertz generation from one CO2 laser in a GaSe crystal

Abstract: Coherent terahertz pulses have been generated at a range of 236.3–1104.5μm (0.27–1.3THz) by one CO2 laser with dual-wavelength output based on collinearly phase-matched different frequency generation (DFG) in a GaSe crystal. This source has the advantages of compact and simplicity for tuning. The output power of the THz pulse and phase-matching conditions were investigated. The maximum single pulse energy of 11nJ was generated at a frequency of 1.23THz (243.6μm), corresponding to a peak output power 182mW. [Copyright &y& Elsevier]