| 摘要 |
PURPOSE:To easily adjust an optical system converting plural coherent light rays having a wide pitch to those of a narrow pitch by specifying a magnification and a focal distance, etc., by the combination of a first and a second lenses. CONSTITUTION:This device is provided with an element independently transmitting the respective plural laser beams in parallel with a pitch Rmum, a first lens with a focal distance f1mm arranged in front of the element, a second lens with a focal distance f2mm arranged in front of the first lens and a multichannel optical waveguide element provided with a distance bmm apart in front of the second lens and a distance Lmm apart from the transmitting point of the element and comprising plural optical waveguides with a pitch Smum (R>S) corresponding to the plural laser beams, respectively. The first and the second lenses make the magnification M (=S/R) in combination with these lenses, the focal distances f1, f2 and the distance L are selected within a range that satisfies an equation I and the distance b falls within a range satisfying an equation II. |
