Widely tunable monochromatic sources and novel detection scheme for THz imaging

Yujie J. Ding; Wei Shi

doi:10.1117/12.631231

7 November 2005 Widely tunable monochromatic sources and novel detection scheme for THz imaging

Yujie J. Ding, Wei Shi

Proceedings Volume 5989, Technologies for Optical Countermeasures II; Femtosecond Phenomena II; and Passive Millimetre-Wave and Terahertz Imaging II; 59891B (2005) https://doi.org/10.1117/12.631231
Event: European Symposium on Optics and Photonics for Defence and Security, 2005, Bruges, Belgium

Abstract

We review our recent progress made on the development of widely-tunable monochromatic THz sources implemented based on difference-frequency generation (DFG) in GaSe, ZnGeP₂, and GaP. Using a GaSe crystal the output wavelength was tuned in the range of from 66.5 μm (150 cm^-1) to 5664 μm (1.77 cm^-1), i.e. into the mm-wave region, with the peak power as high as 389 W. Such a record-high peak power corresponds to a conversion efficiency of about 0.1%. On the other hand, based on DFG in ZnGeP₂ and GaP crystals the output wavelengths were tuned in the wide ranges with high peak powers. There is an obvious advantage of using GaP over GaSe and ZnGeP₂, i.e. crystal rotation is no longer required for achieving wavelength tuning. Instead, one just needs to tune the wavelength of one mixing beam within a narrow bandwidth.

Citation Download Citation

Yujie J. Ding and Wei Shi "Widely tunable monochromatic sources and novel detection scheme for THz imaging", Proc. SPIE 5989, Technologies for Optical Countermeasures II; Femtosecond Phenomena II; and Passive Millimetre-Wave and Terahertz Imaging II, 59891B (7 November 2005); https://doi.org/10.1117/12.631231

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