Room-temperature quasi cw lasing at 1.06 μm was obtained in Li-(La1−x−yNdxCry) -phosphate glass. Thresholds as low as 1 mW and slope efficiencies up to 18% have been measured. Cross pumping of Nd3+ (x = 0.3) via Cr3+ (y = 0.03) yields a transfer efficiency of 0.45. For broadband pump sources, the spectral factor of merit (2.3) raises the slope efficiency over those of Nd3+-only doped laser glasses.
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Harig et al. (1981) studied this question.
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