A Green Upconversion Laser with Erbium-Doped LiLuF<SUB>4</SUB> Crystal by 976 nm Fiber Laser Pump

Abstract

A stable fiber laser operating at appro ximately 976 n m peak power at a 280 ns and 1.9 W pump was used as a pumping source for an upconversion laser based on an Er 3+ :doped LiLuF4 crystal. A 548 n m wavelength and 320 mW could be achieved. In this study, we used a 976 n m lo w threshold average pump power fiber laser at 8 mW, wh ich can achieve green upconversion laser output at room temperature. Th is system includes a high reflective coating at 552 n m+/-10 n m on the LiLuF4 crystal and a 96% reflective mirror forming a laser cavity fo r the 548 n m laser. Using the laser cavity setup and 976 n m fiber laser pu mp, lo w threshold pump power green erbiu m upconversion lasing was achieved. The two peak wavelengths of 548 n m and 537 n m are observed and the intensity changes by changing the input to 976 n m pu mp power.

Structure and upconversion luminescence of transparent glass-ceramics containing (Er,Yb)2(Ti,Zr)2O7 nanocrystals

“…If the excitation wavelength is located in the near-IR, upconversion is typically observed in the visible spectrum. Near-IR-to-visible converters are of practical importance for phosphors [1,2], in solid-state lightning [3], for visible lasers [4][5][6][7][8][9][10][11][12], for the enhancement of the solar cell efficiency [13,14], as fluorescence labels of biomolecules [2,[15][16][17], etc. Conversion of low-energy photons into high-energy ones can be achieved by various mechanisms, namely two-(or multi-) photon absorption, excitedstate absorption, or cross-relaxation [18].…”