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A maximum laser power of 2.4 W was obtained at a wavelength of ∼ 2040 nm for 23 W of absorbed pump power with a slope efficiency of 21.6 % with respect to absorbed power.
We define the finite Q-factor of a continuous-wave lasing resonator as the energy of coherent photons stored in the resonator at a given time over the energy of these coherent photons lost per oscillation cycle.
Resonant total-internal-reflection diode pumping of Q-switched 1.64 μm Er3+:YAG laser with a crystalline fiber-like geometry is reported with ~10 W in cw-mode and 2.8 mJ in Q-switched mode.
Using high-brightness laser diodes for resonantly pumping a 1.64 mum Er:YAG laser, 9 W output power is achieved at 64.3% intrinsic slope with up to 95% mode-fill efficiency.
A theoretical model is presented describing continuous-wave operation of diode-end-pumped Er3+ :YAG lasers. Implemented as a numerical computer model it takes into account the full spectral information of the pump and laser transitions as well as all important ionic levels, their Stark splitting, decay schemes, up-conversion processes, excited-state absorption and especially the thermal dependencies...
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