Infrared-Pumped Visible Laser

Abstract

Infrared-pumped stimulated emission near 6700 Å in BaY2F8 : Yb3+–Er3+ and at 5515 Å in BaY2F8 : Yb3+–Ho3+ is reported. In BaY2F8 : Yb3+–Er3+, oscillation takes place at 77 °K in Er3+ transitions from 4F9/2 to the highest level of the ground state at 410 cm−1. Pumping of Er3+ results predominantly from up-conversion produced by successive energy transfers from Yb3+; direct pumping of the metastable state and higher-lying states of Er3+ is substantially less effective than up-conversion. Oscillation in Ho3+ occurs in a transition from 5S2 to the highest level of the ground manifold at 385 cm−1. Up-conversion and direct pumping contribute about equally to the inversion.

Investigation of up-conversion luminescence properties of RE/Yb co-doped Y2O3 transparent ceramic (RE=Er, Ho, Pr, and Tm)

“…Codoping the material with Yb 3 þ and Ho 3 þ can significantly increase up-conversion yield owing to efficient energy transfer from Yb 3 þ to Ho 3 þ ion [17,18]. The plot of logarithm of I up versus logarithm of P pump is shown in Fig.…”

Efficient oxide phosphors for light upconversion; green emission from Yb3+and Ho3+co-doped Ln2BaZnO5(Ln = Y, Gd)

“…Early upconversion lasers based on rareearth ions only operated at low temperatures (below 100K), making the systems impractical. 14,15 For instance, BaY 2 F 8 : Yb 3+ , Tm 3+ was reported to lase at 77K, 15 but no emission was observed at room temperature. Significant progress was made with the discovery of Er 3+ doped LiLuF 4 crystals emitting bright green emission at room temperature.…”

“…[1][2][3] Potential applications of these materials include biosensors, [4][5][6] colour displays [7][8][9] and solar cells. [10][11][12][13] One of the first historical applications of upconverting materials was in the area of solid-state compact lasers 14 emitting in the visible, with important applications in the areas of data storage, reprographics, and underwater optical communications. Early upconversion lasers based on rareearth ions only operated at low temperatures (below 100K), making the systems impractical.…”

Color tunability of intense upconversion emission from Er3+–Yb3+ co-doped SiO2–Ta2O5 glass ceramic planar waveguides

“…32 However, great advances in both basic research and technological areas have occurred with the introduction of higher power excitation lasers in the market. Therefore, the availability of more efficient diodes and Ti:sapphire lasers operating from 800 to 1100 nm since the 1980s has prompted investigations on the UC dynamics, especially in the case of Er 3+ , thereby leading researchers to verify the possibility of producing UC lasers.…”