Abstract
A high energy pulsed terahertz (THz) laser is studied experimentally. The
laser cavity simply consists of a quartz glass waveguide, a coated GaAs input
window, and a crystal quartz output window. NH<sub>3</sub> is filled in the cavity
as gain medium, and pumped by an 8-J line-tunable transversely excited atmospheric
(TEA) CO<sub>2</sub> laser. When 9R(16) transition acts as the pump line, 55.6-mJ
THz radiation (90 \mu m) is obtained at 730-Pa NH<sub>3</sub> pressure. The
corresponding conversion efficiency is 13.54%. Energy and optimal pressure of
amplified spontaneous emission and laser oscillation are compared.
© 2010 Chinese Optics Letters
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