Triple and Double Photons Absorption Process and Down-Conversion Laser Emitting Investigation of Er-Ion Doped Microsphere

Abstract

We report a readily and cheap method to build taper optical fiber-Er 3+ doped microsphere platform to investigate upconversion fluorescence emission and down-conversion laser oscillation with low threshold pump power. We demonstrate to dope Er 3+ into silica microsphere surface by dipping a single-taper optical fiber into a certain concentration of erbium nitrate solution (Er(NO 3 )) , then dry it and use the electrical-arc of the optical fiber splicer to melt the tip of taper fiber to form the Er 3+ -doped silica microsphere due to surface tension induced. We also present a HF acid etching setup to fabricate low loss biconical optical taper fibers. We demonstrate the Er 3+ doped silica microsphere triple photons and dual photons absorption process of up-conversion fluorescence emission and down-conversion laser oscillation spectra by using the optical tapered fiber to couple 976 nm/1534 nm pump light source.

Ultralow-threshold laser and blue shift cooperative luminescence in a Yb3+ doped silica microsphere

“…OFTs can generate resonant excitation of specific WGMs within microspheres and they are fabricated by melting and drawing standard single-mode fibers. 21,23 The typical waist diameter of OFTs is ∼1.5 μm, and the insertion loss is ∼0.1 dB. The pump source is a 976 nm laser diode.…”

“…Initial PSMs are formed by arc-melting the tips of tapered optical fibers with electrode discharge of a fusion splicer. 21,22 The sol-gel starting solution is prepared by hydrolyzing tetraethoxysilane (TEOS) in water under acid condition, ethanol acts as cosolvent, dimethyl formamide serves as addition agent. Yb 3+ ions are introduced by adding Yb(NO 3 ) 3 · 5H 2 O, and the weight ratio of Yb(NO 3 ) 3 · 5H 2 O/ TEOS is ∼12 wt.…”

Laser oscillation of Yb3+:Er3+co-doped phosphosilicate microsphere [Invited]

“…The diameter of microspheres also was determined by that of glass filaments. Optical fiber tapers were fabricated by melting and drawing a standard single-mode fiber [18], which was used as a coupler-not only for launching pump power into the microspheres but also for coupling out the emitting laser [19,20]. Figure 1 reveals the fabrication process of the YECP microsphere.…”