发明授权
US07869121B2 Small ultra-high NA catadioptric objective using aspheric surfaces 有权
使用非球面表面的小超高NA反射折射物镜

Small ultra-high NA catadioptric objective using aspheric surfaces
摘要:
A relatively high NA objective employed for use in imaging a specimen is provided. The objective includes a lens group having at least one focusing lens configured to receive light energy and form an intermediate image, at least one field lens oriented to receive the intermediate image and provide intermediate light energy, and a Mangin mirror arrangement positioned to receive the intermediate light energy and apply light energy to the specimen. One or more elements may employ an aspheric surface. The objective may provide an uncorrected spectral bandwidth up to approximately 193 to 266 nanometers and numerical apertures in excess of 0.9. Elements are less than 100 millimeters in diameter and may fit within a standard microscope. The field lens may include more than one lens and may be formed of a material different from at least one other lens in the objective.
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