Tuning the lasing wavelength of dye-doped chiral nematic liquid crystal by fluid flow

The influence of hydrodynamic flow on the lasing wavelength and stability of the laser emission average power of a dye-doped chiral liquid crystalline (DDCLC) structure is studied. Multiple lasing peaks at equidistant wavelengths are observed, which are originating from multiple domains that are induced by the hydrodynamic flow of the DDCLC. A simultaneous blue shift over 4nm for all lasing peaks is observed after increasing the flow velocity to 0.3mm/s for cells with a thickness of 10m. It is observed that the CLC flow dramatically increases the stability of the laser emission compared to conventional cells because dye bleaching and LC molecular reorientation due to pumping beam is reduced. [GRAPHICS] .