Abstract
We have enhanced the tunability of a terahertz-wave parametric generator using 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 (), a peak power of , and a linewidth of less than . 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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