Abstract

Backward terahertz pulses were converted from ultrafast pulses of a laser amplifier within multiperiod periodically poled $\mathrm{Li}\mathrm{Nb}{\mathrm{O}}_3$ (PPLN) wafers. The average output powers of more than $2\mu \mathrm{W}$ were obtained from all six domain periods, corresponding to the frequency range of $217\mathrm{GHz}–2.373\mathrm{THz}$. Among the six periods, the highest output power of $10.7\mu \mathrm{W}$ and the narrowest linewidth of $5.98\mathrm{GHz}$ were achieved at the periods of $66.5\mu \mathrm{m}$ and $150.0\mu \mathrm{m}$, respectively.

© 2009 Optical Society of America

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