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| Experimental arrangement used for injection seeding of the coupled-cavity laser. A Ti:Sapphire laser generates femtosecond pulses; a fraction of the power triggers a radio frequency source to generate gain switching pulses. The remaining power is split to form a pump beam and a probe beam. The pump beam is focused onto a photoconductive antenna to generate broadband terahertz pulses. These terahertz pulses are used to injection seed the lasing section of the coupled-cavity laser. The terahertz field emitted from the facet of the tuning section wi sampled using an electro-optic crystal with the time-delayed probe beam. The gain switching pulses are combined with quasi-direct current pulses using a bias tee to drive the lasing cavity above threshold. A second quasi-direct current pulse generator is synchronised with the first pulse generator and used to drive the tuning cavity. Image: Nature Communications / U Leeds. |
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