Optical gain at 1550 nm from colloidal solution of Er^3+-Yb^3+ codoped NaYF_4 nanocubes

Controllable Phase Transformation and Mid-infrared Emission from Er3+-Doped Hexagonal-/Cubic-NaYF4 Nanocrystals

“…As an ideal host, fluorides with low phonon frequency and intense crystalline field, have been widely studied141516. Among these RE fluorides, NaYF 4 with low vibration energy (<400 cm −1 )17, controllable morphology and particle size18 have attracted widespread attention to study the visible up-conversion and near-infrared emission of RE ions in NaYF 4 NCs1718192021. To our best knowledge, no any works are reported about the MIR emission in RE-doped NaYF 4 NCs yet.…”

“…There are two kinds of NaYF 4 host material: cubic (α) and hexagonal (β) phases. At present, a number of methods have been available to synthesize these two kinds of NaYF 4 NCs, including solid treatment, co-precipitation method, hydrothermal/solvothermal synthesis and the surfactant-controlled organometallic pyrolysis approach171819. In this work, environment friendly hydrothermal and co-precipitation methods are chosen to prepare the two kinds of NaYF 4 host material, respectively.…”

Optical amplification in NaYF4:Nd nanoparticle dispersed solution with gain

“…The fluorescence peak of NPs dispersed solution around 1060 nm mismatches with the spectrum of the signal laser at 1064 nm, leading to relative lower gain in the experiments. The gain coefficients were measured and calculated based on the formula G = log(IT /I 0 )/L [13], where L and T are the thickness and transmission of the solution, respectively, I is the intensity of amplified signal, and I 0 is the signal intensity without pumping. Fig.…”

“…doped NPs solution around 1550 nm have been demonstrated because of their higher doping concentration and large stimulation cross-section [13]. However, Er 3+ -ion doped materials generally suffered from complicated energy cross relaxation and up conversion process, which makes them difficult to be applied in high power regime.…”

Nanoparticle dispersion laser

“…In recent years Liu et al [2] measured an optical gain coefficient of 0.58 cm −1 at 1550 nm from a colloidal solution of Er 3 -Yb 3 codoped NaYF 4 nanocubes, and Xu et al [3] measured an optical gain coefficient of 0.13 cm −1 at 1.06 μm from a solution of Nd:NaYF 4 nanoparticles dispersed in CCl 4 . In addition, the fluorescence spectra and lifetimes have been measured for various nanoparticle dispersions that can be candidates for nanoparticle dispersion lasers [4][5][6][7].…”