Tuning, temporal, and spectral characteristics of the green (λ∼549 nm), holmium-doped fluorozirconate glass fiber laser

Intense red upconversion emission in infrared excited holmium-doped PbGeO3–PbF2–CdF2 transparent glass ceramic

“…[12][13][14][15][16][17][18][19], only a few produced visible upconversion emission in holmium-doped materials utilizing a 980 nm source [12,19]. However, in all these reports, the results revealed that the green fluorescence around 540 nm is the dominant upconversion emission signal [10][11][12][13][14][15][16][17][18]. In this work, we report on the generation of a predominant intense red upconversion emission in holmium-activated lead-cadmium germanate vitroceramics under 980 nm diode laser excitation.…”

“…Among several infrared-to-visible upconverters based upon rare-earth doped solid-state materials, holmium-doped systems have emerged as promising candidates for the conversion of infrared semiconductor laser radiation into visible light in the blue-green spectral region. The first upconversion laser employed a BaY 2 F 8 crystal doped with Ho 3+ and Yb 3+ [8], and holmium-doped fibers have also produced upconversion laser action [9][10][11]. Infrared-to-visible upconversion fluorescence emission has recently been investigated in holmium-doped crystals under excitation of different infrared pump wavelengths [12][13][14][15][16][17][18][19].…”

Multi-wavelength visible up-converted luminescence in novel heavily doped Ytterbium–Holmium silica fiber under low-power IR diode pumping

“…Among them, silica fibers activated with holmium (Ho), or co-activated with Yb and Ho [4][5][6][7][8][9][10] are of a special interest since these fibers can be an alternative for communications purposes in a 2-mm spectral range and for the lidar and medicine applications. Yb-Ho-doped fibers can be also used as an amplifying medium for the frequency- On the other hand, as far as we know only the recent work [8] reports on an analysis of Yb-Hodoped silica fiber as a potential material for lasing at wavelength 2.1 mm at IR pumping, where the up-conversion mechanism [11], the effect wellknown in Yb-Ho-co-doped bulk crystals and glasses [12][13][14][15][16][17][18][19], is shown to be quite effective.…”

High-Power ZBLAN Glass Fiber Lasers: Review and Prospect

“…Diode-pumped Ho 3+ -doped ZBLAN fiber laser was demonstrated by Funk et al [176] in 1997 using a 30 mW InGaAlP laser at 643 nm. Excitation spectra, tunability, temporal and spectral characteristics of green Ho 3+ -doped ZBLAN fiber laser were investigated in detail by Funk et al [177,178]. In his continued experiment [135], power conversion efficiency, pump acceptance bandwidth, and excited-state kinetics were studied with a series of experiments in which the Ho 3+ -doped ZBLAN fiber laser has been characterized with regard to fiber length and core diameter, threshold pump power and slope efficiency, and pump acceptance bandwidth.…”