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In this talk we discuss two novel effects in steady state microlasers. The first one is interaction-induced mode switching (IMS), where the onset of a new lasing mode switches off an existing mode via a negative power slope. It's a deterministic effect in steady state lasing and caused by cross saturation of the gain medium, hence it's different from dynamic mode switching or hopping. For a fixed...
Spatial coherence is one of the signature properties of traditional lasers. While spatial coherence allows laser emission to be focused to a small volume or collimated over long distances, it is also the cause of deleterious effects such as speckle which has limited the adoption of lasers in most imaging applications [1]. In this work, we show that random lasers have the unique ability to exhibit...
We demonstrate control of the spatial coherence of random laser emission by tuning the scattering strength and excitation volume. The optimized, spatially incoherent source is applied to full-field optical coherence tomography to mitigate crosstalk.
Ultraviolet microdisks lasers are fabricated on silicon substrates, with a thin layer of zinc oxide grown on top of silica disk. Under optical pumping, lasing occurs in the whispering gallery modes at room temperature.
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