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. 2015 Oct 22;6:8636. doi: 10.1038/ncomms9636

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(a) Experimental set-up used for conventional photoluminescence, energy-momentum spectroscopy and time-resolved measurements. (b) Photoluminescence spectrum of a single-layer Er³⁺:Y₂O₃ sample. (c) Extracted spectrally resolved intrinsic emission rates for ED (blue) and MD (red) transitions obtained from theoretical fit to experimental energy-momentum spectra (Supplementary Fig. 1). AOM, acousto-optic modulator; BL, Bertrand lens; DM, dichroic mirror; FM, flip mirror; freq. synt., frequency synthesizer; func. gen., function generator; LL, laser line; micro. obj., microscope objective; Pol, polarization; SP, short-pass; SPAD, single-photon avalanche photodiode; trig., trigger.