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16-µm emission from Ho^3+-doped fluoride glasses
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- Authors
- Yong Gyu Choi, Bong Je Park, Kyong Hon Kim
- Issue Date
- 2003-04
- Citation
- Optics Letters, v.28, no.8, pp.622-624
- ISSN
- 0146-9592
- Publisher
- Optical Society of America (OSA)
- Language
- English
- Type
- Journal Article
- Abstract
- We have investigated the spectroscopic properties of the 1.6-μm emission from the 5I5 ?넂 5I7 transition of Ho3+ ions in fluoride glasses for use in U-band fiber amplifiers. The intensity profile of the emission peaks at ~1660 nm, with a full width at half-maximum of ~60 nm. The measured lifetime and emission cross section are ~230 μs and ~5.4 × 10-21 cm2, respectively. Frequency upconversion to the 5F1 state occurs simultaneously with excitation of the 1.6-μm emission, so the shorter-wavelength side of the 5I8 ?넂 5I5 absorption spectrum is favorable for population of the 5I5 state. Codoping with rare earths such as Tb3-, Dy3+, Eu3+, and Nd3+ decreases the lifetimes of the lower-lying 5I6 and 5I7 levels and as a result would be of benefit in achieving population inversion between the fluorescing level and the lower-lying levels. © 2003 Optical Society of America.
- KSP Keywords
- Emission cross-section, Fluoride glasses, Full-width at half-maximum(FWHM), Intensity profile, Rare earth, Spectroscopic properties, U-Band, absorption spectrum, fiber amplifier, frequency up-conversion, population inversion