PURPOSE: To establish stable laser oscillator with narrowed spectral line width by providing a ring resonator including a single mode optical waveguide, at least in a part of which a laser activation ion is doped, and polarizing means, and a pumping light source for exciting the ring resonator.
CONSTITUTION: A title device includes ring resonators 3, 4 including a single mode optical waveguide, at least partly in which a laser activation ion is doped, and polarizing means, and a pumping light source 1 for exciting the ring resonators. Light emanating the excitation light source 1 is coupled to an optical film 3 through light wave synthesizing/driving means 2 to excite Er3+ involved in the optical fiber 3 and hence produce light in a 1.5μm band. The light propagates a predetermined number of times through the ring resonator composed of the light synthesizing/splitting means 2 and the optical fibers 3, 4 to establish laser oscillation at the time a pumping level reaches a threshold. Oscillation light is derived to the outside through the light synthesizing/splitting member 2. Hereby, an optical waveguide type laser device having a narrowed spectral line width in a single mode can be constructed only with an optical waveguide.
SARUWATARI MASATOSHI
HORIGUCHI MASAHIRO
| JPS6338903A | 1988-02-19 | |||
| JPS63291488A | 1988-11-29 |
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