Chromium doped crystals exhibit different emitting properties for their different valance species and the host crystals. Ruby shows narrow twin peaks around 694 nm for its Cr3+ ions. Cr4+:YAG has a broadband luminescence range on 1.1~1.6£gm, which is suitable for optical communication.
The thesis aims to study the luminescent spectra of Cr ions in different crystal structure (Al2O3 and YAG). Cr concentration dependent spectra indicate Cr3+ moving toward the octahedron sites. It results the change of luminescent spectra and luminescent decay lifetime.
Both FTIR and confocal microscopy are used for the investigations. Step-scan FTIR provides the relation of luminescence intensity relating to both wavenumber and delay time, of the external light source.The high numerical aperture optics in the confocal microscope provides higher collection efficiency, and results a better S/N ratio.
In addition, Raman spectra are measured. Ruby and sapphire crystals exhibit different Raman spectra, which results from the electronic resonance of the Cr3+ ions in the ruby crystal.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0722108-113652 |
| Date | 22 July 2008 |
| Creators | Wu, Yu-hua |
| Contributors | Bai, Shih-Jung, Hsu, Jui-Hung, Chou,Ming-Chi |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0722108-113652 |
| Rights | not_available, Copyright information available at source archive |
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