| 摘要 |
A light source device provided with a light emission tube (1) in which a light emitting element is enclosed and at least one laser oscillator part (2) for radiating a laser beam towards said light emission tube, for focusing a beam within a light emission tube with a large solid angle and for preventing that the beam with a high energy density impinges upon the wall of the light emission tube, the light emission tube has a tube wall, part of which is made to function as a focusing means (32), or the light emission tube has a focusing means at the inner surface thereof.
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