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Continuous‐wave (CW) room‐temperature (RT) laser operation with low energy consumption is an ultimate goal for electrically driven lasers. A monolithically integrated perovskite laser in a chip‐level fiber scheme is ideal. However, because of the well‐recognized air and thermal instabilities of perovskites, laser action in a perovskite has mostly been limited to either pulsed or cryogenic‐temperature...
In article number 2006819, Chien‐Chih Lai and co‐workers report the first demonstration of a diode‐pumped ultralow‐threshold continuous‐wave room‐temperature perovskite laser, by coating MAPbI3 nanocrystallites onto a high‐quality yttrium aluminum garnet (YAG) crystal fiber. The atomically smooth crystal fiber not only serves as a perfect microcavity for ultralow‐loss optical resonance but also facilitates...
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