Low threshold melt-processed two-photon organic surface emitting upconversion lasers

Herein, a low threshold, wavelength-tunable, compact, two-photon pumped upconversion laser is presented. The surface emitting lasers are composed of melt-processed 1,4-bis[2-[4-[N,N-di(p-totyl)amino]phenyl]vinyl]benzene (DADSB) as active media and two designed distributed bragg reflectors. The melting fabrication process is very simple, and the lasing threshold is as low as 150 μJ cm−2 pulse−1, when pumped by a Ti:sapphire amplifier operating at 800 nm with a 150 fs pulse width. To the best of our knowledge, it is one of the lowest values for two-photon lasers. Lasing from multimode to single-mode oscillation is demonstrated. Tunable single mode oscillation was obtained at wavelength from 514 nm to 523 nm with a spectral width of less than 0.2 nm.

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► Extremely low threshold two photon excited upconversion lasing is demonstrated.
► Multimode and single-mode laser oscillation from device excited with near-IR wavelength is demonstrated.
► The fabrication of two-photon upconversion laser is very simple and feasible.