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Thin-Film Optical Filters for Phase Control Applications

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Phase control has been an important component in optical design in applications using ultrashort pulse lasers and high-data-rate telecommunications lasers. Now, phase control requirements are emerging in life sciences applications such as structured illumination and multiphoton microscopy.

RANCE FORTENBERRY, PH.D., MIKE SCOBEY, PETER EGERTON AND AMBER CZAJKOWSKI, ALLUXA INC.

Thin-film filters (TFFs) can create virtually any spectral shape imaginable to modify the transmission or reflection of light in optical systems. During design, strong emphasis is often placed on optimizing the amplitude response, although for many emerging optics applications, equally important is the need to control the phase of the light. The frequently neglected phase response is increasingly a consideration for optical coating manufacturers, creating challenges that require new, sophisticated design and manufacturing methods. Figure 1. Thin-film mirror stack reflection,...Read full article

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    Published: November 2015
    Glossary
    superresolution
    Superresolution refers to the enhancement or improvement of the spatial resolution beyond the conventional limits imposed by the diffraction of light. In the context of imaging, it is a set of techniques and algorithms that aim to achieve higher resolution images than what is traditionally possible using standard imaging systems. In conventional optical microscopy, the resolution is limited by the diffraction of light, a phenomenon described by Ernst Abbe's diffraction limit. This limit sets a...
    refraction
    The bending of oblique incident rays as they pass from a medium having one refractive index into a medium with a different refractive index.
    CoatingsFeaturesFilterslensessuperresolutionmirrorsOpticsLasersMicroscopyBiophotonicsthin-film opticsRance FortenberryMike ScobeyPeter EgertonAmber CzajkowskiAlluxarefractiongroup delay dispersion

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