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Spatial hole burning is suppressed in linear Er/sup 3+/ fibre lasers by two alternative modulation schemes. They move the standing wave pattern, formed by the two counterpropagating waves, along the gain medium in an oscillatory or continuous way. Output bandwidths <5 kHz result.<<ETX>>
Spatial hole burning and mode jumping in a linear Nd/sup 3+/ fibre laser are suppressed by inserting an integrating optical phase modulator at one end of the resonator and a section of undoped fibre at the other end. At 1088 nm a linewidth of 40 MHz is obtained.<<ETX>>
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