I have been using 785 nm continuous laser for 20 months. 350 mW is the maximum output of the laser mentioned by the manufacturer. At the beginning I used to get the same power with my power meter. However, I can see the power is 285 mW, which means 20% dropped from the maximum power. Is there any suggestions why the power is dropping? any thumbs of rules that can predict the laser life time ?
Perhaps you run it too close to the max power, e.g. https://www.rpmclasers.com/blog/understanding-laser-diode-lifetime/
To my knowledge the degradation of laser power is due to ageing of the laser components, especially when acting close to their individual operational limits (see the answer of Nikolay Pavlov or 'google' for these issues); but has really nothing to do with any kind of radioactice decay, as mentioned above...
Best regards
G.M.
May be your laser contains the hydrophillic component? May be the electric supplying of pumping system was slightly damaged (capacitors or transistors)? May be active media (or output mirror of cavity) slightly damages due to the dust in air and its adsorption on the surface of mirror. It is necessary to use air stream to realize processing of mirror. Check all the component of system or ask offices of company.
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