Tuning of random lasers by means of external magnetic fields based on the Voigt effect

It has been proposed that emission spectrum of random lasers with magnetically active semiconductor constituents can be made tunable by external magnetic fields. By employing the FDTD method, the spectral intensity and spatial distribution of electric field are calculated in the presence of an external magnetic field. It is numerically shown that due to the magneto-optical Voigt effect, the emission spectrum of a semiconductor-based random laser can be made tunable by adjusting the external magnetic field. The effect of magnetic field on the localization length of the laser modes is investigated. It is also shown that the spatial distribution of electric field exhibited remarkable modification with variation of magnetic field.

► A new method is proposed to obtain a tunable random laser.
► Tunability of the proposed random lasers is based on the Voigt effect.
► Emission spectrum can be controlled by the magnetic field.
► Spatial distribution of the electric field depends on the applied magnetic field.