MODE FINE-STRUCTURE OF THE P-GE INTERVALENCEBAND LASER MEASURED BY HETERODYNE MIXING SPECTROSCOPY WITH AN OPTICALLY PUMPED RING GAS-LASER

Heterodyne mixing of the far infrared p-Ge intervalenceband pulse lase r and the optically pumped continuous wave ring gas laser at 117.7 mu m (CH2F2), 118.8 mu m (CH3OH) and at 184.3 mu m (CH2F2) revealed the p -Ge laser mode fine structure with a resolution below 1 MHz, the absol ute mode linewidth and a mode tunability of 25 MHz during the p-Ge las er pulse due to sample heating. For the first time and acousto-optical spectrometer has been used in such experiments which analysed the mod e spectrum during a single pulse in a 1 GHz band. We have combined the methods of grating, homodyne mixing and heterodyne mixing spectroscop y for the investigation of the p-Ge laser mode fine structure in the b road band emission regime with different resonators including a high-Q tunable resonator for single mode operation.