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Theoretical and experimental investigations of small-signal gain for a diode-pumped Q-switched Cr:LiSAF laser

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6 Author(s)
Balembois, F. ; Univ. de Paris-Sud, Orsay, France ; Falcoz, F. ; Kerboull, F. ; Druon, F.
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We present a theoretical model proving that up-conversion and thermal quenching of fluorescence strongly limit small-signal gain in a CW pumped Cr:LiSAF laser. We have a good agreement with experimental measurements of small-signal gain obtained with a new simple method. We have then optimized the gain in a Cr:LiSAF laser pumped by two 400-mW red diodes. The highest gain, 1.11 at 600 mW of absorbed pump power, is obtained if the pump spot is circularized inside the crystal and if the Cr:LiSAF is pumped on both sides. In Q-switched operation, this laser produces tunable pulses (up to 6.5 μJ at 10 kHz) between 800 and 900 nm

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Quantum Electronics, IEEE Journal of  (Volume:33 ,  Issue: 2 )