Abstract
Tm3+:Li3Ba2Gd3(MoO4)8 crystal has been grown by the top seeded solution growth (TSSG) method from a Li2MoO4 flux. The room temperature polarized absorption spectra, fluorescence spectra, and fluorescence decay curves of the crystal were measured. Based on the Judd-Ofelt (J-O) theory, the main spectroscopic parameters of the crystal, including the spontaneous emission probabilities, fluorescence branching ratios, and radiative lifetimes were calculated and analyzed. The broad and strong absorption bands of the crystal show that it can be efficiently pumped by the diode laser, while the large emission cross-sections of the 3F4 → 3H6 transition indicate that the crystal is a promising candidate for tunable and short pulse lasers.
Highlights
With the rapid progress of high power diode lasers, Tm3+-doped laser media has been intensively investigated because of their potential applications associated with emissions in the visible and infrared spectral regions, at ~1.50 and ~2.0 μm wavelength
Other important advantages of Tm3+ ions include strong absorption of AlGaAs diode laser radiation at ~800 nm, a long lifetime of the 3F4 state, a high quantum efficiency due to the cross-relaxation between 3H4 and 3F4 multiplets, as well as a wide emission band around in the range of 1800–2000 nm, which is definitely promising for the generation of tunable and ultrafast solid state lasers
As Li3Ba2Gd3(MoO4)8 crystal melts incongruently [12], the crystal was grown by the top seeded solution growth (TSSG) method from a flux of Li2MoO4
Summary
With the rapid progress of high power diode lasers, Tm3+-doped laser media has been intensively investigated because of their potential applications associated with emissions in the visible and infrared spectral regions, at ~1.50 and ~2.0 μm wavelength. Other important advantages of Tm3+ ions include strong absorption of AlGaAs diode laser radiation at ~800 nm, a long lifetime of the 3F4 state, a high quantum efficiency due to the cross-relaxation between 3H4 and 3F4 multiplets, as well as a wide emission band around in the range of 1800–2000 nm, which is definitely promising for the generation of tunable and ultrafast solid state lasers. The double tungstate and molybdate crystals with scheelite structure are characterized by their local disordered crystal structure [4,5,6,7,8] The advantages of these crystals are high quantum efficiency, broad absorption and emission brands, as well as relatively low upper-level lifetime. The studies are extended to Tm3+-doped Li3Ba2Gd3(MoO4) crystal with the objective of exploring new Tm3+-doped crystal for efficient laser operations near 2 μm, and the growth and spectral properties of Tm3+:Li3Ba2Gd3(MoO4) crystal are reported
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