The tuning property of the fiber sheet type dye laser has been studied. When the array of the active fibers doped with a laser dye in a plastic core is pumped by a pulsed N2 laser, the fiber dye laser emission with narrow spectrum is obtained in wide wavelength region.

As new nonlinear optical materials, several organic crystals such as N, N-dimethyl-p-nitroaniline and 5-methyl-2-nitrobenzoic acid have been grown in the form of crystal fiber from the melts. These crystal fibers with a 100µm core diameter and a 10 mm length generated an efficient SHG of Nd : glass laser. The observed SHG intensities were comparable to that of NBD-cloride crystal fiber.