Random laser spectrum responds to temperature
By combining liquid-crystal technology with light diffusion in random systems, researchers at the European Laboratory for Non-Linear Spectroscopy (LENS; Florence, Italy) have created a random laser source that changes its color spectrum in response to changes in temperature. With a diffusive ground-glass powder as the scattering medium and a laser dye to provide gain, random lasers operate by multiple random-scattering events between disordered particles rather than the mirrored lasing cavity in traditional lasers.
DYE LASERS