| 简介 |
A 2-dimensional image display device using laser has a problem that interference noise called speckle noise is generated. The noise can be reduced by using a multi-wavelength light source but there has been no green light source which can be employed. By using Yb dope clad pump fiber (103) which is a rare earth-added fiber as laser active material, it is possible to significantly widen the peak of the fluorescent spectrum and increase the change width of the amplitude wavelength as compared when oxide crystal is used. Moreover, by using the rare earth-added fiber as a fiber amplifier without arranging a laser mirror at its both ends, it is possible to eliminate control of the resonator length which has been required in the conventional example (when oxide crystal is used as laser medium). That is, it becomes possible to perform high-speed wavelength control and accordingly, to reduce the speckle noise when it is mounted on the 2-dimensional image display device. |
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