Why laser output power decreases with increasing temperature

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SUMMARY

The discussion centers on the phenomenon of decreasing laser output power with increasing temperature of the active medium, specifically in the context of Neodymium-doped Yttrium Aluminium Garnet (Nd:YAG) lasers. Participants assert that thermal lensing does not significantly impact output power, but rather the energy levels of the doped material are affected. The introduction of Neodymium as a dopant causes the energy levels in YAG to widen, which influences the efficiency and performance of the laser. Understanding these interactions is crucial for optimizing laser performance in various applications.

PREREQUISITES
  • Understanding of laser physics and operation principles
  • Familiarity with Neodymium-doped Yttrium Aluminium Garnet (Nd:YAG) lasers
  • Knowledge of thermal lensing effects in optical systems
  • Basic concepts of energy level transitions in doped materials
NEXT STEPS
  • Research the effects of temperature on laser efficiency in Nd:YAG lasers
  • Study the principles of thermal lensing and its impact on laser performance
  • Explore the mechanisms of energy level widening in doped materials
  • Investigate alternative dopants and their effects on laser output power
USEFUL FOR

Laser engineers, optical physicists, and researchers involved in laser technology development and optimization will benefit from this discussion.

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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