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Effects of sample shape in p-Ge 'hot-hole' lasers

The efficiency of p-Ge hot-hole lasers is shown to depend on the shape of the sample. This is due to the inhomogeneity of the electric field caused by the Hall effect. To estimate the effect on gain, Monte Carlo (MC) simulations are performed for the case of intervalence band (IVB) lasing, while for light-hole cyclotron resonance (LHCR) lasing characteristics are taken from the literature. It is concluded that samples with an elongated rectangular cross section perpendicular to B are advantageous because they provide a relatively large region with positive gain.