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Hybrid optical systems using kinoforms offer broadband achromatization. While improving high-frequency performance, diffraction effects reduce modulation transfer functions at low frequencies.

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Area of Science:

Optics
Optical Engineering
Diffractive Optics

Background:

Hybrid diffractive-refractive optical systems combine refractive and diffractive elements.
Kinoforms, a type of diffractive optical element, exhibit large negative dispersion, enabling achromatization.
Achieving high efficiency in diffractive optics is typically limited to specific object points and wavelengths.

Purpose of the Study:

To investigate the design and performance of broadband hybrid diffractive-refractive optical systems.
To evaluate the achromatization capabilities of kinoforms in landscape lenses and Schmidt telescopes.
To assess the polychromatic image quality considering diffraction efficiency.

Main Methods:

Designed hybrid diffractive-refractive systems (landscape lens, Schmidt telescope).
Utilized kinoforms for achromatization due to their large negative dispersion.
Calculated modulation transfer functions (MTFs) by constructing weighted geometric point-spread functions from diffracted orders.

Main Results:

The hybrid achromats demonstrated improved MTFs at high spatial frequencies.
Diffraction into nondesign orders reduced MTFs at low spatial frequencies.
Polychromatic image quality was evaluated accounting for diffraction efficiency.

Conclusions:

Hybrid kinoform-based systems can achieve broadband achromatization.
Diffraction effects in kinoforms impact polychromatic image quality, particularly at lower spatial frequencies.
The design trade-offs involve balancing achromatization with diffraction efficiency for optimal system performance.