ELECTRIC-FIELD DEPENDENCE OF THE CYCLOTRON P-GERMANIUM LASER LINE

We performed a detailed study of the emission spectra of a hot-hole cyclotron p-germanium laser. The laser was operated in crossed electric and magnetic fields, which were parallel to two different [110] axes of the germanium crystal. Using a high-resolution Fabry-Perot spectrometer a broadening of the laser line was found. A band structure analysis made it possible to understand the observed feature. The line broadening is explained by the inhomogeneity of the electric field inside the crystal, which leads to slight deviations of the resonance frequency in different places. We manufactured a non-rectangular shaped laser crystal for enhancing the electric field homogeneity. Our first results show that the new laser configuration leads to a narrowing of the laser line.