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Diode-pumped ytterbium-doped Sr5(PO4)3 F laser performance

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8 Author(s)
Marshall, C.D. ; Lawrence Livermore Nat. Lab., CA, USA ; Smith, L.K. ; Beach, R.J. ; Emanuel, M.A.
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The performance of the first diode-pumped Yb3+-doped Sr 5(PO4)3F (Yb:S-FAP) solid-state laser is discussed. An InGaAs diode array has been fabricated that has suitable specifications for pumping a 3×3×30 mm Yb:S-FAP rod. The saturation fluence for diode pumping was deduced to be 5.5 J/cm 2 for the particular 2.8 kW peak power diode array utilized in our studies. This is 2.5× higher than the intrinsic 2.2 J/cm 2 saturation fluence as is attributed to the 6.5 nm bandwidth of our diode pump array. The small signal gain is consistent with the previously measured emission cross section of 6.0×10-20 cm2, obtained from a narrowband-laser pumped gain experiment. Up to 1.7 J/cm3 of stored energy density was achieved in a 6×6×44 mm Yb:S-FAP amplifier rod. In a free running configuration, diode-pumped slope efficiencies up to 43% (laser output energy/absorbed pump energy) were observed with output energies up to ~0.5 J per 1 ms pulse. When the rod was mounted in a copper block for cooling, 13 W of average power was produced with power supply limited operation at 70 Hz with 500 μs pulses

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Quantum Electronics, IEEE Journal of  (Volume:32 ,  Issue: 4 )