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- W2032656987 abstract "With the advent of high power and narrow bandwidth 969 nm pump diodes, direct pumping into the upper laserlevel of Yb:YAG and hence quasi-2-level lasers became possible. Pumping directly into the emitting level leadsto higher quantum efficiency and reduction of non-radiative decay. Consequently, thermal load, thermal lensingand risk of fracture are reduced significantly. Moreover pump saturation and thermal population of uninvolvedenergy-levels in ground and excited states are benefical for a homogenous distribution of the pump beam aswell as the reduction of reabsorption loss compared to 3-level systems, which allows for high-power DPSS lasers.Beside continuous-wave (cw) operation, nanosecond pulses with a repetition rate between 1 and 5 kHz are anattractive alternative to flashlamp-pumped systems (10-100 Hz) in various measurement applications that requirehigher data acquisition rates because of new faster detectors. Based on measurements of the absorption anda detailed numerical model for pump beam distribution, including beam propagation and saturation factors,power-scaling of a ceramic rod Yb:YAG oscillator was possible. Finally a cw output power of 50 W with 33% pump efficiency at 1030 nm has been demonstrated (M2 < 1.2). Nanosecond pulses have been produced bycavity-dumping of this system. The cavity-dumped setup allowed for 3-10 ns pulses with a pulse energy of 12.5mJ at 1 kHz (M2 < 1.1). In order to achieve these results a systematic experimental and numerical investigationon gain dynamics and the identification of different stable operating regimes has been carried out." @default.
- W2032656987 created "2016-06-24" @default.
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- W2032656987 date "2015-02-20" @default.
- W2032656987 modified "2023-10-06" @default.
- W2032656987 title "50W CW output power and 12mJ pulses from a quasi-2-level Yb:YAG ceramic rod laser end-pumped at the 969nm zero-phonon line" @default.
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- W2032656987 doi "https://doi.org/10.1117/12.2079401" @default.
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