Patent ID: 6829051
Filing Date: 2004-12-07
Classification: G01N

Abstract:
An optical apparatus comprising:a light source; an illuminating optical system for illuminating a sample with illuminating light emitted from said light source; a first wavelength selecting member; a light beam splitter for leading said illuminating light to the sample an objective lens disposed between said light beam splitter and said sample; a detector for detecting light from the sample through the objective lens; and a second wavelength selecting member disposed between said objective lens and said detector, wherein said first wavelength selecting member has at least a wavelength selecting element which selectively transmits light having wavelengths in a predetermined region out of said illuminating light, wherein said second wavelength selecting member has at least a wavelength selecting element which selectively transmits light having a predetermined wavelength out of light reflected or emitted from said sample, wherein said light beam splitter has an optical element, and wherein said optical element has a transmittance characteristic not lower than 85% and a reflectance characteristic not higher than 15% at least in a wavelength region not shorter than 400 nm and not longer than 700 nm.