一维光子晶体的带边，群速度接近于零，也就是说，如果这个结果内的光子将经

Dimensional photonic crystal with a side group velocity close to zero, i.e., if the result of the photons will pass multiple reflections, the energy band of photons is not present. Adding an organic laser dyes in the cholesteric liquid crystal, if the fluorescent spectrum of the dye and the cholesteric liquid crystal reflection spectra overlap, the edge burning light reflection spectrum is the reflection forming cavity, is formed along the helical axis of the laser emission direction Fu

The edge of a one-dimensional photon crystal, the group speed is close to zero, that is, if the photons in this result will undergo multiple reflections, there is no photon in the energy band. Organic laser dye is added to the bile phase liquid crystal, and if the fluorescent spectrum of the dye and the reflection spectrum of the bile phase liquid crystal overlap, the burned light is reflected along the edge of the reflection to form a resonant cavity, and a laser fume is formed along the direction of the spiral axis.

At the band edge of one-dimensional photonic crystal, the group velocity is close to zero, that is to say, if the photons in this result will be reflected many times, there is no photon in the band. If the fluorescence spectrum of the dye overlaps with the reflection spectrum of the cholesteric liquid crystal, the burning light will be reflected along the reflection spectrum edge to form a resonant cavity, and the laser beam will form along the spiral axis<br>