Absorption background and laser properties of YAP:Nd |
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Authors: | Jiří Kvapil Bohumil Perner Michal Košelja Josef Kvapil |
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Institution: | (1) Monokrystaly Turnov, Leninova 175, 511 19 Turnov, Czechoslovakia |
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Abstract: | YAP:Nd laser crystals suffer to a greater extent than YAG:Nd from colour centres formation. Stable brownish-yellow or green colourations are evoked by non-oxidizing treatment at high (>1500 °C) temperature. The former colouration may be attributed to holes in the oxygen neighbourhood of Y3+ at Al sites, the latter to the F+ centres. Brownish-red colouration of less stability is induced by optical pumping of Nd3+ containing crystals. It may be attributed to holes in oxygen neighbourhood of Nd3+.Dependences of the colourations on the preparation methods are described. YAP:Nd,Zr laser rods, oxygen annealing of which was followed by medium (1100–1400 °C) temperature treatment in vacuum or hydrogen showed no anomalous colouration and extremely low losses at Nd3+ emission wavelength independent of pumping power. Using such rods, an overall efficiency of 2·5% and a slope efficiency of 3·0% in CW lasers were reached. |
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