Optically pumped lasing measurements were carried out on a homebuilt far-field micro-PL system. The excitation pulses (400 nm, ~100 fs, 1 kHz) were generated from the second harmonic of the fundamental output of a regenerative amplifier (Solstice, Spectra-Physics; 800 nm, ~100 fs, 1 kHz), which was, in turn, seeded by a mode-locked Ti:sapphire laser (Mai Tai, Spectra-Physics; 800 nm, ~100 fs, 80 MHz). The microwires on glass substrates (refractive index, ~1.5) were locally excited with a laser beam focused down to ~20 μm in diameter through an objective (Nikon CFLU Plan; 50×; numerical aperture, 0.8), with input power altered by neutral density filters. After passing through a 420-nm long-pass emission filter, the collected PL signal from the microwires was subsequently coupled to a grating spectrometer (Acton SP-2358) and recorded with a thermal electrically cooled charge-coupled device (Princeton Instruments, ProEm: 1600B).

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