| 摘要 |
PCT No. PCT/JP97/03104 Sec. 371 Date May 4, 1998 Sec. 102(e) Date May 4, 1998 PCT Filed Sep. 4, 1997 PCT Pub. No. WO98/10495 PCT Pub. Date Mar. 12, 1998A laser oscillator which uses a granular laser gain medium to secure a large gain volume and is capable of suppressing resonator loss caused by granular-boundary scattering. A suspension (1), which is obtained by dispersing a number of dielectric grains doped with a luminous element in fluid having refractive index matched with that of the dielectric grains, is filled in a cell (6). The cell (6) filled with the suspension (1) is disposed in an optical resonator constituted by a rear mirror (3) and an output mirror (4). When the cell (6) is irradiated with excitation light (2), the dielectric grains in the suspension (1) are subjected to laser pumping and a laser beam (5) is output. Since the dielectric grains coexist with the refractive index-matched fluid, the granular-boundary scattering is suppressed, making it possible to provide a low-loss optical resonator. Dielectric grains with a slightly greater diameter may alternatively be distributed in filling liquid which is refractive index-matched fluid.
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