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Very short erbium-fibre lasers with holographically written gratings in the erbium-doped fibre core are reported. An output power of 181μW was obtained from a 2cm long diode-pumped laser. A 1cm long diode pumped laser had an output power of 57μW. As would be expected for such short cavity lengths, these lasers are robustly singlemode.
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Zyskind et al. (1992) studied this question.
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