Tm3+:CaF2 planar waveguides grown by liquid phase epitaxy on CaF2 substrates showing signal enhancement at 1.92 μm
✍ Scribed by S. Renard; P. Camy; J.L. Doualan; R. Moncorgé; M. Couchaud; B. Ferrand
- Publisher
- Elsevier Science
- Year
- 2006
- Tongue
- English
- Weight
- 172 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0925-3467
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✦ Synopsis
We report on relative gain measurements at 1.92 lm in Tm:CaF 2 films grown on pure CaF 2 substrates by using Liquid Phase Epitaxy with CaCl 2 as a solvent. Electron microscopy and X-ray diffraction measurements show that the Tm 3+ :CaF 2 films are about 5 lm thick and have a small lattice mismatch with the CaF 2 substrate. Room temperature emission spectra of the Tm 3+ ions around 1.9 lm exhibit the same structure as in the bulk crystals and the lifetime of the 3 F 4 metastable level is found equal to about 12.8 ms. The Tm:CaF 2 films are guiding optical waves and exhibit a relative gain of 7% at 1.92 lm when pumped at 0.765 lm.