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28 September 2006 Compact and coherent source of widely tunable THz radiation
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We report a THz radiation source based on the technique of non-collinear phasematched parametric generation. The source, which is compact and operable at room temperature, generates nanosecond pulses of peak power and energy greater than 3 W and 17 nJ respectively. The radiation is continuously tunable over the range 1.2-3.05 THz and is of narrow spectral bandwidth (<100 GHz). The use of intersecting pump and parametric wave cavities results in minimum threshold pump pulse energies below 1 mJ (from a Nd:YAG laser excited at 20 W, 500 μsec by a quasi-CW diode-laser) and close to 50% down-conversion efficiency when operated at twice threshold.
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T. J. Edwards, D. Walsh, M. B. Spurr, P. G. Browne, C. F. Rae, and M. H. Dunn "Compact and coherent source of widely tunable THz radiation", Proc. SPIE 6402, Optics and Photonics for Counterterrorism and Crime Fighting II, 64020C (28 September 2006);

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