About 25-mm-long and similar to 1-mm-diameter transparent crystalline fibers of Rd6G (0.01, 0.1 and 1.0molwt%) doped L-arginine phosphate (LAP) have been grown by the laser-heated pedestal growth technique using similar to 4W CO2 laser power, 36mm/h fiber pulling speed and 14 mm/h sample rod pushing speed. TG analysis shows the improvement in the thermal properties of LAP by Rd6G doping. XRD and photoluminescence techniques have been used for the characterization of fibers. Optical transmission studies indicate that in normal laboratory conditions there is less degradation in Rd6G:LAP compared to undoped LAP. (c) 2007 Elsevier B.V. All rights reserved.