Waveguide lasers have been fabricated by potassium ionexchange in neodymium-doped BK-7 glass. Lasers operating at λ = 1058 nm in a single-transverse-mode at both pump and lasing wavelengths showed launched-power thresholds as low as 7.5 mW.
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Mwarania et al. (1990) studied this question.
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