Abstract
Rare earth doped fiber lasers for emission in the infrared wavelength region above 1.55 micron are of great interest for several applications, including eye-safe LIDAR and DIAL systems for defence applications [1]. In particular single frequency sources emitting above 2 micron would allow longer coherent length and thus better sensitivity for coherent detection at long distance, thanks to the atmospheric transmission window available [2]. Ho3+ ions are interesting for their ability to provide the following efficient radiative decays:5I7 ➔ 5I8 at 2.1 μm and 5I6 ➔ 5I7 at 2.9 μm by pumping with suitable laser diodes [3]. Tellurite glasses are promising candidates for laser sources in the near infrared, thanks to the lowest phonon energy among oxide glasses, the ability of hosting higher amounts of dopants than silicate glasses and a higher stability than fluoride and chalcogenide glasses [4,5].
© 2011 Optical Society of America
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