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A Class 3R laser is considered safe if handled carefully, with restricted beam viewing. With a class 3R laser, the MPE can be exceeded, but with a low risk of injury. Visible continuous lasers in Class 3R are limited to 5 mW. For other wavelengths and for pulsed lasers, other limits apply.
Multimode lasers. The limit on total output power from a single-mode laser comes from considerations of power density within the narrow waveguide. Lower power density and higher powers can be obtained simply by making the laser structure wider, raising the width from 3 or 4 Âµm up to 50, 100 or 200 Âµm.