We demonstrate that the etalon effects of alkali cells can be used as the output coupler of an alkali laser. Based on a rubidium cell with highly parallelized windows, a 2.7 W rubidium laser with optical efficiency of 20.9% and slope efficiency of 31.8% is obtained by adopting unconventional output couplers. Since it has compact configuration and the inner surface of the rubidium cell is uncoated, this may be used in high power laser systems with long lifetimes.
A new scheme of diode pumped alkali vapor laser (DPAL) which uncouples the temperature and the concentration of alkali vapor is reported. Non-equilibrium instead of saturated potassium vapor is used. The calculation results indicate that the optical-to-optical efficiency of the diode pumped non-equilibrium potassium vapor laser (NE-DPAL) is higher than that of saturated vapor at high power pumping density.
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