Abstract
We investigated methods for improvement of continuous-wave (CW) terahertz
(THz) output power by laser diode (LD) pumping in noncollinear phase-matched
difference frequency generation (DFG). The effects of interaction length and
beam spot size of input lasers (near-IR) in GaP crystals were studied. The
THz wave power dependence on various sizes of GaP crystals was investigated
and it was observed that an output power of 4 nW was obtained with a 20 mm
long GaP crystal at 1.5 THz. Also, the THz wave absorption coefficient was
dominant for longer GaP crystals at high frequencies (above 2.5 THz). The
THz wave power dependence on beam spot size (1.2 mm–300 $\mu{\rm m}$) of near-IR lasers at 1.62
THz was studied, and an improvement of THz wave power
being seen with a 500 $\mu{\rm m}$ beam spot size, while the beam divergence effect was dominant for
beam spot sizes below 500 $\mu{\rm m}$.
© 2009 IEEE
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