| 摘要 |
<p>An optical system for generating light includes a doped fluoride fiber (820), which is used to convert energy of light at a first frequency, supplied by an optical pump(s) (840 and 850), to light at a second frequency. The second frequency may be lower (down-conversion) or higher (up-conversion) than the first frequency. The optical pump(s) (840 and 850) is/are coupled to the doped fiber by fiber(s) (860 and 870). A reflector (810 and 825) may be placed at each facet of the doped fiber to form a laser cavity. The reflectors, (810 and 825), at the facets of the fiber are tuned to a desired emission frequency of the fiber. The laser cavity may be formed either by two substantial reflectors (810 and 825) or a substantial and a partial reflector. When two substantial reflectors are used, a wavelength division multiplexer or diffraction grating (892, 894 and 896) may be as an output path for the light at the second frequency. The optical system may be used to generate red, green and blue wavelength laser light for image projection systems. A broad emission spectrum may be formed by co-directional or contra-directional pumping of the doped fiber. In such a case a reflector is ground at an angle so that a laser cavity is not formed.</p> |
