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Why must the power supply be „stabilized and peak-free“?

Laser diodes react sensitively to voltage spikes and current fluctuations. An unregulated supply or one with peaks can destroy the diode within microseconds – even if the peak occurs only briefly. Stabilized means: constant output voltage under load (no sag during switch-on). Peak-free means: no switching spikes or overshoot on the supply lines. Always use a switching power supply with sufficient smoothing or a dedicated laser diode driver. Avoid unfiltered supplies, cheap plug-in adapters without filtering, and supplies that are shared with other switching loads.