Abstract
The progress achieved on power scaling and compact and portable THz sources
is reviewed. By reversely stacking the GaP plates, the photon conversion efficiency
is improved from 25% to 40% which corresponds to the maximum value. When the number
of the plates is increased from four to five, the output power decreases because of
back conversion. The THz generation is also investigated by mixing the two
frequencies generated by a single Nd:YLF solid-state laser. The average output power
reaches 1 \mu W. The introduction of two Nd:YLF crystals significantly improves the
output power to 4.5 µW. This configuration facilitates the generation of different
output frequencies.
© 2011 Chinese Optics Letters
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