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mode sweeping

A form of laser output noise that is caused by thermal, mechanical, or acoustical disturbances of the cavity length. Mode sweeping occurs when the length of the laser cavity changes as a result of environmental conditions or changes in temperature, which cause the longitudinal modes to sweep across the gain curve causing fluctuations in output power. Very short lasers with a single longitudinal mode can fluctuate from max power to zero power and back to maximum power as temperature changes. The longer the laser the smaller the fluctuations of power.
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