There are mainly two standard solutions:
a) using a long resonator – which means, that you must not miniaturize the laser – results in using as many longitudinal modes as mode hopping does not cause significant intensity noise.
b) forcing a single mode operation, which is accompanied by significant loss of intensity.
The Georg-August-Universität of Göttingen proposes a method based on a multiple time delayed feedback control. A signal generated from intensities of the fundamental modes is fed back to the pump power. The result is a highly stable output (peak-to-peak better 1%) with nearly no loss of intensity. Such stable cw-lasers with high beam quality are used in measurement and medicin, but in RGB projection systems and holografic displays. Now these systems can be miniaturized.
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