High aperture off-axis parabolic mirror applied in digital holographic microscopy

Kalenkov, G. S.

doi:10.1117/1.oe.57.4.043112

Opt. Eng.

2018

DOI: 10.1117/1.oe.57.4.043112

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High aperture off-axis parabolic mirror applied in digital holographic microscopy

G. S. Kalenkov¹

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Cited by 2 publications

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Polarization-Maintaining Diffractive Elements for Off-Axis Terahertz Digital Holography

Sobczyk

Makowski

Kowalczyk

et al. 2023

J Infrared Milli Terahz Waves

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Off-axis digital holography in the terahertz waves allows three-dimensional visualizations of optically opaque volumetric objects in a single exposure and with angular separation of the zero-order component. Forming the tilted reference beam usually requires a set of mirrors, which can disturb the polarization, causing the loss of contrast in fringes at the detector. Here we present a mirror-less approach with 3D-printed transmissive diffractive optical elements, providing unaltered polarization and successful holographic measurements at 0.1 THz without any pre- or postprocessing of interference fringes.

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Polarization-Maintaining Diffractive Elements for Off-Axis Terahertz Digital Holography

Sobczyk

Makowski

Kowalczyk

et al. 2023

J Infrared Milli Terahz Waves

View full text Add to dashboard Cite

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Planar focusing reflectors based on monolithic high contrast gratings: design procedure and comparison with parabolic mirrors

Komar¹,

Gębski²,

Czyszanowski³

et al. 2020

Opt. Express

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Here, we describe in detail a procedure for the numerical design of planar focusing mirrors based on monolithic high contrast gratings. We put a special emphasis on the reconstruction of the hyperbolic phase of these mirrors and we conclude that the phase does not have to be perfectly mimicked to obtain a focusing reflector. We consider here the grating mirrors that focus light not in the air but in the GaAs substrate and we compare them with conventional parabolic reflectors of corresponding dimensions. The light intensity at the focal point of the focusing grating mirrors was found to be comparable to that of the parabolic reflector. Moreover, the reflectivity of the focusing grating mirrors is almost as high as that of parabolic mirrors covered with an additional reflecting structure, if the ratio of the reflector width to the focal length is less than 0.6. Planar focusing grating mirrors offer a good alternative to parabolic mirrors, especially considering the complexity of fabricating three-dimensional structures compared to planar structures.

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High aperture off-axis parabolic mirror applied in digital holographic microscopy

Cited by 2 publications

References 17 publications

Polarization-Maintaining Diffractive Elements for Off-Axis Terahertz Digital Holography

Polarization-Maintaining Diffractive Elements for Off-Axis Terahertz Digital Holography

Planar focusing reflectors based on monolithic high contrast gratings: design procedure and comparison with parabolic mirrors

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