Stuttgart 2012 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 54: Poster 3
Q 54.21: Poster
Donnerstag, 15. März 2012, 16:30–19:00, Poster.I+II
Intracavity absorption spectroscopy with a Nd-doped ZBLAN fiber laser in the spectral range from 1.32 to 1.35 µm — •Johannes Röhl, Svetlana Kuznetsova, Peter Fjodorow, Ortwin Hellmig, Benjamin Löhden, Klaus Sengstock, and Valery Baev — Institut für Laserphysik, Universität Hamburg, Germany
Emission spectrum of Nd3+- doped silica fiber lasers is very sensitive to intracavity absorption. Up to now absorption measurements have been performed in the spectral ranges 0.9 - 0.945 µm (4F3/2 → 4I9/2) and 1.075 - 1.14 µm (4F3/2 → 4I11/2) [1]. The laser emission at another strong transition, 4F3/2 → 4I13/2 around 1.33 µm could not be excited in silica glass, because of strong excited state absorption. In order to achieve laser emission in this spectral range we use a Nd-doped ZBLAN glass fiber where the influence of excited state absorption is sufficiently reduced. The selected ZBLAN fiber is doped with 1000 ppm of Nd and pumped by a laser diode at λp = 808 nm. The fiber length is 50 cm, the cut-off wavelength λc = 1.05 µm and the core/cladding diameters are 5/125 µm. In the emission spectra of the laser, ranging from 1.32 to 1.35 µm, we have observed a strong atmospheric absorption dominated by water vapor lines. The sensitivity of this fiber laser to intracavity absorption corresponds to the effective absorption path length of several kilometers. Absorption spectra of various other molecules such as HF, CH4, OH and NO can be detected in this spectral range as well.
[1] J. Hünkemeier et al., Optics Communications 176, 417 (2000).