Joshua R. Freeman, Jean Maysonnave, Suraj Khanna, Edmund Linfield, A. Giles Davies, Sukhdeep S. Dhillon, and Jérôme Tignon
We implement a Maxwell-Bloch simulation for a two-level system within the FDTD method to simulate the seeding of lasers by broadband pulse injection. The model does not make the slowly varying envelope approximation and the full electromagnetic field is simulated so that we are able to obtain time resolved seeding by few-cycle pulses. The model is compared to recent results on seeding of THz quantum cascade lasers to aid interpretation of their complex signals. The simulations are found to be in good agreement with the data when gain recovery times of 15ps are used. Furthermore we find that the emission from the laser depends only weakly on the seed used to initiate laser action. The model is readily applicable to any seeded laser system where few-cycle seed pulses are used.
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