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The stimulated emission cross section of the 1.061-μm transition (R1—Y1) in Nd: YAG has been measured and is (5.1 ± 0.5) × 10−19 cm2 on the same scale that assigns the value 8.8 × 10−19 cm2 to the 1.064-μm line. The thresholds of the 1.061- and 1.064-μm lines have been determined over the temperature range of 100–300 °K and are equal at 229 °K.
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Birnbaum et al. (1973) studied this question.
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