Patent ID: 7456967

Claim:
A method for minimizing wavelength dependent error in a mark position detection apparatus, comprising: illuminating a mark using an illumination optical system, comprising: producing as plurality of light fluxes having a plurality of wavelengths from a light source, transmitting the plurality of light fluxes through a first optical element, and adjusting the first optical element relative to a first optical axis in the illumination optical system in accordance with a wavelength range, wherein said first optical element suppresses a tool induced shift (TIS) value of the mark position detection apparatus caused by telecentricity of the illumination optical system; and collecting and focusing reflected light from a mark to form an image using an imaging optical system, wherein adjusting the first optical element comprises: (a) measuring a first measurement error at a first range of wavelengths; (b) measuring a second measurement error at a second range of wavelengths, wherein the second range of wavelengths is longer than the first range of wavelengths; (c) calculating a difference between the first measurement error and the second measurement error; (d) tilting the first optical element in a direction in which the difference decreases; and (e) repeating steps (a) through (d) until the difference reaches a predetermined value.