English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Here we report and discuss the avalanche-like up-conversion behavior inabsence of the avalanche. We experimentally observed significant changes in theslope of the curve for the intensity dependence of up-conversion luminescenceof erbium ions in green band on the pump intensity of the diode laser. Suchchanges are typical for the photon avalanche. However, the concentration oferbium ions is insufficient for an efficient exchange of energy between them,and excitation of a photon avalanche is not possible. Using a simplethree-level approximation of the up-conversion process model, we have shownthat the observed avalanche-like luminescence process can also occur in theabsence of a photon avalanche due to the non-linear relation between theefficiency of two pumping channels of erbium ion caused by intensity dependenceof the absorption.

Avalanche-like behavior of up-conversion luminescence by nonlinear coupling of pumping rates