| 摘要 |
Technology of forming a fine light beam overcoming the limit caused by the wavelength of light and characteristics of the objective lens. A beam distribution shifter 4 having two light transmission regions is disposed between a source 1 of light and an objective lens 5, a phase-shifting means is provided on one of the two light transmission regions to divine the light passing through the beam distribution shifter 4 into two light fluxes L1 and L2 having phases opposite to each other, and the two light fluxes L1 and L2 are focused through the objective lens 5 to form a fine light beam overcoming the limit caused by the wavelength of light and characteristics of the objective lens 5. <IMAGE> |
