Abstract

We have enhanced the tunability of a terahertz-wave parametric generator using $\mathrm{MgO}\text{:}{\mathrm{LiNbO}}_3$ pumped by a subnanosecond, passively Q-switched, microchip Nd:YAG laser. This pump source allows high-intensity pumping without damage to the nonlinear crystal and generates a narrow linewidth and tunable terahertz wave with injection seeding by an external cavity diode laser for the idler wave. The high-intensity pumping causes a gain curve broadening of the terahertz-wave parametric generation, especially in the high-frequency region. We obtained an output terahertz wave with a tuning range of $0.9–3\mathrm{THz}$ ($100–330\mathrm{\mu m}$), a peak power of $100\mathrm{mW}$, and a linewidth of less than $10\mathrm{GHz}$. This room temperature operated, palm-sized source promises to be a widely tunable terahertz-wave source that is suited to a variety of applications.

© 2009 Optical Society of America

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