Abstract
A pulse laser on a phosphate glass activated by Cr3+-Yb3+-Er3+ ions (λ = 1.54 μm) was used to pump Y2Al5O12:Er3+ (YAG:Er) crystals to the lower laser level of a 3-μm transition (4I11/2 → 4I13/2) in Er3+ ions (λ = 2.94 μm). For a pumping pulse energy of Eexc = 200 mJ, the efficiency of 3-μm lasing was 20%. A differential efficiency of the YAG:Er laser in the case of a resonance pumping into the lower laser level amounted to 26%.
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