Explain Why Reflective Optics Avoided Chromatic Aberration

# Explain Why Reflective Optics Avoided Chromatic Aberration

Chromatic aberration is the blurring that happens when an optical system focuses different wavelengths of light at slightly different points, smearing an otherwise sharp image.

A simple lens-only system exposed to a broad light spectrum suffers this blurring directly, which would have limited how fine a pattern Micralign could project cleanly.

Because Micralign's imaging relied primarily on mirrors, which reflect every wavelength identically, the system avoided most chromatic aberration without needing an expensive, narrow-bandwidth light source.

CHROMATIC ABERRATION, PLAIN TERMSCausea lens focuses different wavelengths at different pointsEffectthe projected pattern blurs across the spectrumRisk to lithographyblur limits how fine a pattern can print cleanly

Diagram above: chromatic aberration, plain terms.

HOW MIRRORS SIDESTEP THISMirror behaviorreflects all wavelengths at one consistent angleResultno wavelength-dependent focus shiftPractical benefitsharper images without a narrow-bandwidth light source

Diagram above: how mirrors sidestep this.

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