Nonlinear negative transmittance at a CW 980‐nm laser diodes pumping in Yb³⁺:CaF₂ nanocrystals‐embedded glass ceramics

Abstract

Cooperative upconversion luminescence (CUCL) occurs in spectral regions in which single ions do not have energy levels. However, all results reported so far are concentrated on luminescence properties from Yb3+ ions‐doped various hosts. Here, we report the observation of nonlinear negative transmittance (NNT) at continuous‐wavelength (CW) 980‐nm laser diodes (LDs) pumping in silicate oxyfluoride glass ceramics (GCs)‐containing CaF2:Yb3+ nanocrystals. The unique optical nonlinearity is analyzed based on energy‐level transitions, dynamic evolution, rate equation, and power transmission equation, which can be explained as the cooperative optical absorption for the intense CUCL of Yb3+ ions. The NNT in the CaF2:Yb3+ nanocrystals‐embedded GCs can be tailored with the power of a CW 980‐nm LDs, which possesses potential for the development of future optical limiters and switches.

Er3+‐Yb3+ ions doped fluoro‐aluminosilicate glass‐ceramics as a temperature‐sensing material

“…The heat treatment conditions such as the temperature and time are crucial to the nucleation and growth processes, as well as to the diffusion coefficient of Er 3+ ions into the crystallites. The optical transmittance of GCs decreases with heat treatment temperature since the light scattering increases with the growth of crystallites 13,14 . However, it is a challenge to precisely control the crystal size within nanoscale and to promote insertion of Er 3+ ions into nanocrystals and thereby to improve UC luminescent performance.…”

Clarifying the Different Roles of Rare Earth Ions in the Crystallization of Upconversion Oxyfluoride Glass Ceramics by Solid-State Nuclear Magnetic Resonance Spectroscopy

“…However, most Er 3+ ions prefer to enter into LaF 3 crystals rather than the PbF 2 crystal or glass phase even the content of the LaF 3 crystal is lower than 1 mol %. The detailed results in this work explicitly show that rare earth ions cannot be homogenously incorporated into bivalent metal fluoride crystals such as PbF 2 , which is contrary to the past expectations. − However, the preferential dissolution of the rare earth ion in another codoped rare earth ion fluoride crystal proves the validity of the strategy that multiple rare earth ions are codoped to increase the upconversion luminescent efficiency.…”

Anti-escaping of incident laser in rare-earth doped fluoride ceramics with glass forming layer

“…Among multitudinous RE ions, the level structure of Er 3+ is rich and uniform, and Er 3+ has strong absorption capacity in the ~980 nm and ∼1.53 μm ranges commonly used in laser detection 42–50 . In addition, Yb 3+ ion as sensitized ion can further absorb the NIR radiation efficiently and transfer the excitation energy to Er 3+ via energy transfer processes, which can achieve large NIR laser absorption and efficient up-conversion emission, presenting a great potential in laser protection materials 51–59 . At present, the glass matrix typed laser protective material can overcome the shortcomings of the poor heat resistance, easy aging and low chemical resistance of the plastic matrix typed.…”