Optimization design of a powe-scaled rubidium laser with a 3-stage amplification configuration

Because of the extremely high saturation gain of a diod-pumped alkali laser (DPAL), the master oscillator powe-amplifier (MOPA) system is an ideal selection to achieve powe-scaling of DPALs. In this report, a theoretical model based on the kinetic algorithm was established for construction of the 3-stage amplification configuration in which the en-pumped structures were adopted. Then the amplification factors at different temperatures were calculated when the cell lengths in the MOPA system are 3, 5, and 7 cm, respectively. According to the simulation results, a 3 c-long vapor cell was employed for the pr-amplification, a 5 c-long vapor cell was chosen for the first mai-amplification, and a 7 cm-long cell was used for the second mai-amplification. With such a designed MOPA system, the output power over 1000W for a 50mW Rb-DPAL seed light can be optained. In addition, the power of fluorescence and generated heat are evaluated for this 3-stage MOPA system. The research could provide some design schemes and theoretical methodology for realization of a powe-scaled DPAL-MOPA system.