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Theoretical Studies of Fundamental Processes Relevant to Diode Pumped Alkali Lasers

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[Technical Report, Final Report]

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Theoretical studies of basic kinetic and optical processes relevant to DPALs that strongly affect the operation of these lasers and governing their output power and efficiency as well as studies of the output beam quality have been performed. The results were compared with experimental results obtained in our and other labs. Our main activity in the reported period concentrated on the following subjects i Dependence of static K DPAL performance on addition of methane 3D CFD modeling and comparison with experimental results. ii Velocity dependence of the performance of flowing-gas K DPAL with He and HeCH4 buffer gases 3D CFD modeling and comparison with experimental results. iii 3D CFD modeling of flowing-gas Rb DPALs effects of buffer gas composition and of ionization of high lying Rb states. iv Quantum mechanical computations of the dissociative recombination rate constant of K2 ions in the gain medium of K DPAL calculations of the potential energy surfaces for highly excited dissociative states of the ground state of the molecular ion and their crossing points. v Calculations of the quenching cross-section of the excited electronic levels of Rb by methane using quantum mechanics methods. vi Detailed theoretical study of controlling the beam quality in DPALs by changing the resonator parameters.

Subject Categories:

  • Lasers and Masers

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[A, Approved For Public Release]