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We demonstrate a THz optical delivery system capable of supplying a low divergence HE11 Gaussian beam at a distance of >500mm from the facet of a THz quantum cascade laser. This is achieved by optimising the optical coupling to an external hollow flexible polystyrene-lined Ag waveguide, by utilising a monolithically integrated cylindrical metal waveguide in the laser mounting block. This is shown...
We have realized a compact beam-shaping and collimating element for a double metal terahertz (THz) quantum cascade laser (QCL) emitting around 2.9 THz using directly integrated hollow metallic waveguides. Our approach allowed us to efficiently improve the beam profile with respect to the standard emission pattern observed out of a double metal QCL. The Gaussian-like mode profile emerging from the...
We presented the efficient performance of Yb:YAG/Cr, Yb:YAG self-Q-switched microchip lasers by bonding Yb:YAG crystal under high-brightness laser-diode pumping. The effects of transmission of the output coupler (Toc) and the pump intensities on the performance of the Yb:YAG/Cr, Yb:YAG self-Q-switched microchip laser were addressed.
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