Tuning of Laser Frequency in Random Media of Dye-Doped Polymer and Glass-Particle Hybrid Shiyoshi YOKOYAMA1,2 and Shinro MASHIKO2 1Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Corporation (JST), 588-2 Iwaoka, Nishi-ku, Kobe 651-2401, Japan 2Communications Research Laboratory, 588-2 Iwaoka, Nishi-ku, Kobe 651-2401, Japan (Received March 17, 2003; revised manuscript received May 16, 2003; accepted for publication June 5, 2003) Abstract We prepared a solid-state random medium as a laser source consisting of laser-dye-doped polymer and glass-particlescatterers. The random medium was prepared by dispersing glass particles in polymer medium by laser-induced glass ablation.　The gain medium emitted single-mode laser light that had a 0.15 nm spectral linewidth. The lasing action was based on the coherent feedback resulting from the strong optical scattering and was characterized in terms of the random laser. Our experimental results suggest that the spatial confinement of emitted light at certain wavelengths results in the fine tuning of the lasing frequency. [DOI: 10.1 143/JJAP.42.L970] KEYWORDS: organic and inorganic hybrid, laser dye, random laser, glass particle, mirrorless laser, light scattering