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Maximizing output power of a low-gain laser system
Applied Optics
|September 11, 2010
Summary
Rigrod theory accurately models low-gain laser power. Higher saturation increases overtone efficiency but not always measurable power, offering insights for laser mirror reflectivity optimization.
Area of Science:
- Laser Physics
- Chemical Lasers
Background:
- Rigrod theory is a standard model for laser output power.
- Overtone lasers present unique challenges in modeling efficiency and power extraction.
Purpose of the Study:
- To accurately model outcoupled power from a low-gain overtone continuous-wave (cw) hydrogen fluoride (HF) chemical laser using Rigrod theory.
- To investigate the relationship between medium saturation, overtone efficiency, and measurable power.
- To establish a method for accurately deducing high-reflectivity mirror reflectivities in laser systems.
Main Methods:
- Application of Rigrod theory to model overtone laser performance.
- Analysis of data from the University of Illinois at Urbana-Champaign overtone laser.
- Experimental measurements of mirror transmissivities and outcoupled power.
Main Results:
- Rigrod theory accurately predicted outcoupled power for the low-gain laser.
- Increased medium saturation enhances overtone efficiency but not necessarily measurable power.
- A method was developed to deduce high-reflectivity overtone mirror reflectivities with approximately ±0.07% accuracy.
- Intracavity flux and mirror loading can be significantly reduced with appropriate mirror losses and sufficient gain length.
Conclusions:
- Rigrod theory is effective for modeling low-gain overtone lasers.
- The developed method for reflectivity deduction is potentially applicable to other laser systems.
- Maximum overtone efficiency is estimated to be in the range of 80%-100%.
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