Infrared laser-induced desorption of H2O and hydrocarbons from optical surfaces
Abstract
Laser-induced desorption has been demonstrated for strongly optically absorbing molecules on nominally transparent substrates. Both H2O and hydrocarbon contaminants were desorbed using a pulsed HF/DF laser source at 2.8 and 3.7 μm. Following laser desorption of H2O, the 2.8-μm damage threshold in CaF2 roughly doubled. Surface mapping of H2O desorption with a 120-μm-diam focal spot showed considerable variation with spatial position on polished CaF2, indicating localized concentrations of adsorbate.
- Publication:
-
Applied Physics Letters
- Pub Date:
- September 1982
- DOI:
- 10.1063/1.93556
- Bibcode:
- 1982ApPhL..41..416A
- Keywords:
-
- Desorption;
- Infrared Lasers;
- Laser Windows;
- Surface Finishing;
- Calcium Fluorides;
- Contaminants;
- Hydrocarbons;
- Pulsed Lasers;
- Transparence;
- Water;
- Optics