A liquid-crystalline blue-phase laser with a tunable photonic bandgap (PBG) of over 150 nm and a wide temperature range is demonstrated by Myoung Hoon Song and Suk-Won Choi on p. 3002. A lasing peak shift of more than 100 nm is realized due to the large PBG shift of the liquid-crystalline blue phase. The shift in the lasing wavelength was reversible during repeated temperature changes over the entire stability range of the liquid-crystalline cubic blue phase.
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