Experimental determination of laser induced breakdown thresholds of metals under nanosecond Q-switched laser operation
| Autor: | J. Javier Laserna, L. M. Cabalín |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Infrared
business.industry Chemistry Physics::Optics Plasma Nanosecond Threshold energy medicine.disease_cause Laser Q-switching Atomic and Molecular Physics and Optics Analytical Chemistry law.invention Optics law Melting point medicine Optoelectronics business Instrumentation Spectroscopy Ultraviolet |
| Zdroj: | Spectrochimica Acta Part B: Atomic Spectroscopy. 53:723-730 |
| ISSN: | 0584-8547 |
| DOI: | 10.1016/s0584-8547(98)00107-4 |
| Popis: | Laser-induced breakdown thresholds for several pure metals were determined using a nanosecond laser. A Q-switched pulsed Nd:YAG laser operating at infrared (1064 nm), visible (532 nm) and ultraviolet (266 nm) wavelengths has been used. The plasma was generated by focusing the Nd:YAG laser on the target in air at atmospheric pressure. The dispersed plasma light was detected using a two-dimensional intensified charge-coupled device (CCD) detector. The studied elements were chosen according to their different thermal and physical properties, particularly boiling point, melting point and thermal conductivity. The effect of wavelength on the plasma threshold has been discussed. Laser fluence thresholds in the ultraviolet were larger than those obtained using visible and infrared radiation, while the energy threshold is larger using infrared radiation. Correlations between the plasma threshold of metal targets and the melting point and boiling point at 266, 532 and 1064 nm have been established. The results indicate that thermal effects have an important influence on the ablation behavior of metals at the three wavelengths used. |
| Databáze: | OpenAIRE |
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