Why laser output power decreases with increasing temperature

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Laser output power decreases with increasing temperature of the active medium due to changes in energy levels and thermal effects. Thermal lensing affects the focusing of the laser but does not directly reduce output power. As temperature rises, the energy levels in the material can broaden, impacting the efficiency of the laser. The introduction of dopants like Neodymium (Nd) into materials such as YAG causes energy levels to widen, which can influence the laser's performance. Understanding these thermal and dopant effects is crucial for optimizing laser output.
DariusP
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Why laser output power decreases with increasing temperature? By increasing temperature, I mean increasing temperature of the active medium.

I think that thermal lensing alone should not have effect on output power? Just different focusing (focal length).

What happens with energy levels in materials?
 
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Also, could I get an explanation as to why when we introduce a dopant (Neodymium (Nd) for example) to a material (Yttrium aluminium garnet (YAG) for example) then the energy levels "widen"? I know I've read this but I'm not sure if I understand it.
 

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