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Journal of Luminescence

Stimulated emission and excited-state absorption at room temperature on the 550 nm-laser transition in Er 3+ doped YAlO 3

Markus Pollnau, ERNST HEUMANN, Günter Huber

Published Apr 1, 1994• 11 citations
Publisher
DOI
10.1016/0022-2313(94)90292-5

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One-dimensional nanobeam photonic crystal cavities are fabricated in an Er-doped amorphous silicon nitride layer.Photoluminescence from the cavities around 1.54 µm is studied at cryogenic and room temperatures at different optical pump powers.The resonators demonstrate Purcell enhanced absorption and emission rates, also confirmed by time-resolved measurements.Resonances exhibit linewidth narrowing with pump power, signifying absorption bleaching and the onset of stimulated emission in the material at both 5.5 K and room temperature.We estimate from the cavity linewidths that Er has been pumped to transparency at the cavity resonance wavelength.

•Jan 1, 2010•24 citations
Using a laser diode modulated at 250 and 500 MHz, dependence of enhanced absorption on both sample length and temperature was investigated in an erbium doped yttrium aluminum garnet crystal. The transmitted laser intensity decreased with a decay time of 300 ps for sample lengths greater than 3.0 mm and temperatures higher than 50 K when the incident laser intensity increased. In addition, an emission peak was observed near 835 nm corresponding to the transition from the S3/24 level to the I13/24 in Er3+. It was suggested that the enhanced absorption was caused by stimulated emission in three excited states.
One-dimensional nanobeam photonic crystal cavities are fabricated in an Er-doped amorphous silicon nitride layer.Photoluminescence from the cavities around 1.54 µm is studied at cryogenic and room temperatures at different optical pump powers.The resonators demonstrate Purcell enhanced absorption and emission rates, also confirmed by time-resolved measurements.Resonances exhibit linewidth narrowing with pump power, signifying absorption bleaching and the onset of stimulated emission in the material at both 5.5 K and room temperature.We estimate from the cavity linewidths that Er has been pumped to transparency at the cavity resonance wavelength.