Simultaneous Red, Green, and Blue Lasing Emissions in a Single‐Pitched Cholesteric Liquid‐Crystal System

Simultaneous red, green, and blue lasing emissions are demonstrated in a single resonator with a single gain medium by a single optical pumping (see figure). The resonator is fabricated using cholesteric liquid crystal systems with multiple photonic band gaps, and the energy transfer between two fluoresence dyes is employed in gain medium.