High resolution, absolute excited-state absorption (ESA) spectra, at room temperature, from the long-lived 3F4 energy
level of several crystals doped with trivalent thulium (Tm3+) ions have been measured employing high-brightness
narrowband (FWHM <30 nm) light emitting diodes (LEDs) as a probe wavelength. The aim of this investigation was to
determine the strength of ESA channels at wavelengths addressable by commercially available semiconductor laser diodes
operating around 630-680 nm. The favourable lifetime of the 3F4 manifold and negligible ground-state absorption (GSA) for
the red-wavelength second-step excitation, ensures a direct and efficient route for a dual-wavelength pumping scheme of the
thulium ion, which will enable blue-green laser emission from its 1G4 upper-laser level.
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