| 摘要 |
PURPOSE:To improve the efficiency of optical transmission by providing an optical multiplexer multiplexing laser light outputted from plural laser light sources and a single optical fiber transmitting light from the optical multiplexer and irradiating the light source from one end face toward an optical magnetic recording medium. CONSTITUTION:The linearly polarized laser light irradiated from a couple of laser elements 10, 12 with fixed position and different wavelength is condensed respectively by lenses 22, 24 on incident end faces 18, 20 with fixed position of single core repeater optical fibers 14, 16 so as to couple the repeater optical fibers 14, 16 and the leaser elements 10, 12 optically. The laser light is multiplexed into one optical path by an optical synthesizer 26, transmitted through a single core irradiated light transmission optical fiber 28 and condensed respectively on the 1st recording layer 36 and the end recording layer 38 of the photomagnetic recording medium 34 through an objective lens 32 from an irradiation end face 30. Thus, number of components is reduced, the optical transmission efficiency of an optical head is improved and miniaturization is attained. |
