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Observation and morphology of small-scale laser induced damage
1Pennsylvania State University, Physics Department, University Park, Pennsylvania 1680, USA.
Applied Optics
|April 15, 2010
Summary
Clean, defect-free coatings significantly boost laser damage thresholds. This study on ThF(4)/ZnS coatings reveals damage sites strongly correlate with pre-existing defects, impacting laser performance.
Area of Science:
- Optical coatings
- Laser-induced damage
Background:
- Thin-film coatings are crucial for laser optics.
- Understanding laser-induced damage is vital for material durability.
Purpose of the Study:
- Investigate laser-induced damage in lambda/4 ThF(4)/ZnS coatings at 10.6 micrometers.
- Correlate damage sites with pre-existing surface defects.
- Analyze damage morphology to determine causes.
Main Methods:
- Utilized Twyman-Green and knife-edge techniques for surface analysis before and after irradiation.
- Employed Nomarski microscopy to study damage morphology.
- Examined coated silicon and silica substrates.
Main Results:
- Knife-edge technique proved superior for defect mapping.
- Damage sites showed a high correlation with pre-existing defects.
- Damage morphology varied: melts/burns on silicon, bubbles on silica, often along scratches.
Conclusions:
- Defect-free coatings exhibit substantially higher laser damage thresholds.
- Surface defects act as initiation sites for laser-induced damage.
- Coating quality is paramount for laser system reliability.
