Lasing is obtained in Tm 3+ -doped sodium—gadolinium tungstate NaGd(WO 4 ) 2 crystals longitudinally pumped by pulses from a laser diode bar. The slope lasing efficiency is 16%. Lasing was observed at wavelengths of 1957, 1944, 1936, and 1901 nm for the transmission coefficients of the output mirror T out = 0.3%, 1.4%, 3.3%, and 8.5%, respectively.
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Zharikov et al. (2006) studied this question.
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