Dr. Konstantinos Falaggis Profile

Dr. Konstantinos Falaggis

Assistant Professor

SPIE Involvement:

Conference Program Committee | Author

Websites:

Company Website

Publications (20)

Proceedings Article | 3 October 2022 Presentation + Paper

Vision ray metrology: a new versatile tool for the metrology and alignment of optics

Ana Hiza Ramirez-Andrade, Shohreh Shadalou, Dustin Gurganus, Matthew Davies, Thomas Suleski, Konstantinos Falaggis

Proceedings Volume 12223, 1222304 (2022) https://doi.org/10.1117/12.2634327

KEYWORDS: Metrology, Cameras, Wavefronts, Imaging systems, Calibration, 3D modeling, 3D vision

Read Abstract +

Proceedings Article | 3 October 2022 Presentation + Paper

Variable shearing holography with geometric phase elements

P. Shanmugam, A. Light, A. Turley, K. Falaggis

Proceedings Volume 12223, 122230M (2022) https://doi.org/10.1117/12.2634326

KEYWORDS: Reconstruction algorithms, Holography, Diffraction gratings, Interferometry, Phase shifting, Optimization (mathematics)

Read Abstract +

Proceedings Article | 21 August 2020 Presentation + Paper

Numerical integration of slope data with application to deflectometry

Ana Ramirez-Andrade, Rosario Porras-Aguilar, Konstantinos Falaggis

Proceedings Volume 11490, 1149009 (2020) https://doi.org/10.1117/12.2570600

KEYWORDS: Deflectometry, Numerical integration, Optics manufacturing, Optical testing, Aspheric metrology, Optical metrology

Read Abstract +

SPIE Journal Paper | 5 January 2019 Open Access

Multicolor fluorescence microscopy using static light sheets and a single-channel detection

Jacob Licea-Rodriguez, Alfredo Figueroa-Melendez, Konstantinos Falaggis, Marcos Plata Sánchez, Meritxell Riquelme, Israel Rocha-Mendoza

JBO, Vol. 24, Issue 01, 016501, (January 2019) https://doi.org/10.1117/12.10.1117/1.JBO.24.1.016501

KEYWORDS: Luminescence, Imaging systems, Microscopy, Cameras, Objectives, Image acquisition, Visualization, Microscopes, Modulation, Data transmission

Read Abstract +

DOWNLOAD PAPER

Proceedings Article | 18 August 2018 Paper

Multi-wavelength phase unwrapping: a versatile tool for extending the measurement range, breaking the Nyquist limit, and encrypting optical communications

Konstantinos Falaggis, Ana Hiza Ramirez-Andrade, David Towers, Catherine Towers, Rosario Porras-Aguilar

Proceedings Volume 10749, 1074913 (2018) https://doi.org/10.1117/12.2321987

KEYWORDS: Interferometers, Interferometry, Phase measurement, Metrology, Phase interferometry, Optical communications

Read Abstract +

Proceedings Article | 18 August 2018 Paper

Grey-level coding for structured-light illumination systems

Konstantinos Falaggis, Rosario Porras-Aguilar

Proceedings Volume 10749, 107490F (2018) https://doi.org/10.1117/12.2322050

KEYWORDS: 3D metrology, Modulation transfer functions, Phase measurement, Phase shifting, Deflectometry, Fringe analysis, Environmental sensing, Phase shifts

Read Abstract +

Proceedings Article | 9 March 2016 Paper

Enhanced lateral resolution for phase retrieval based on the transport of intensity equation with tilted illumination

J. Martinez-Carranza, K. Falaggis, T. Kozacki

Proceedings Volume 9718, 97180H (2016) https://doi.org/10.1117/12.2212876

KEYWORDS: Phase retrieval, Phase imaging, Resolution enhancement technologies, X-ray imaging, Microscopy, X-ray microscopy, Wavefronts, Fourier transforms, Super resolution, Algorithm development, Imaging systems, Image resolution, Diffraction, Radio propagation

Read Abstract +

Proceedings Article | 24 August 2015 Paper

Optimal single beam wave-field reconstruction with application to speckle field recovery

Konstantinos Falaggis, Tomasz Kozacki, Malgorzata Kujawinska

Proceedings Volume 9660, 966008 (2015) https://doi.org/10.1117/12.2196893

KEYWORDS: Signal to noise ratio, Speckle, Spatial frequencies, Reconstruction algorithms, Phase retrieval, Contrast transfer function, X-ray optics, Metrology, Electroluminescent displays, Wavefront reconstruction

Read Abstract +

Proceedings Article | 22 June 2015 Paper

Deterministic phase retrieval employing spherical illumination

J. Martínez-Carranza, K. Falaggis, T. Kozacki

Proceedings Volume 9525, 952503 (2015) https://doi.org/10.1117/12.2184760

KEYWORDS: Spherical lenses, Phase retrieval, Sensors, Cameras, Wave propagation, Modulation, Radio propagation, Pixel resolution, Fourier transforms, Phase shift keying

Read Abstract +

Deterministic Phase Retrieval techniques (DPRTs) employ a series of paraxial beam intensities in order to recover the phase of a complex field. These paraxial intensities are usually generated in systems that employ plane-wave illumination. This type of illumination allows a direct processing of the captured intensities with DPRTs for recovering the phase. Furthermore, it has been shown that intensities for DPRTs can be acquired from systems that use spherical illumination as well. However, this type of illumination presents a major setback for DPRTs: the captured intensities change their size for each position of the detector on the propagation axis. In order to apply the DPRTs, reescalation of the captured intensities has to be applied. This condition can increase the error sensitivity of the final phase result if it is not carried out properly. In this work, we introduce a novel system based on a Phase Light Modulator (PLM) for capturing the intensities when employing spherical illumination. The proposed optical system enables us to capture the diffraction pattern of under, in, and over-focus intensities. The employment of the PLM allows capturing the corresponding intensities without displacing the detector. Moreover, with the proposed optical system we can control accurately the magnification of the captured intensities. Thus, the stack of captured intensities can be used in DPRTs, overcoming the problems related with the resizing of the images. In order to prove our claims, the corresponding numerical experiments will be carried out. These simulations will show that the retrieved phases with spherical illumination are accurate and can be compared with those that employ plane wave illumination. We demonstrate that with the employment of the PLM, the proposed optical system has several advantages as: the optical system is compact, the beam size on the detector plane is controlled accurately, and the errors coming from mechanical motion can be suppressed easily.

Proceedings Article | 18 August 2014 Paper

Comparison of phase retrieval techniques based on the transport of intensity equation using equally and unequally spaced plane separation criteria

J. Martinez-Carranza, K. Falaggis, M. Jozwik, T. Kozacki

Proceedings Volume 9204, 92040G (2014) https://doi.org/10.1117/12.2061976

KEYWORDS: General packet radio service, Phase retrieval, Contrast transfer function, Wave propagation, Error analysis, Spatial frequencies, Interferometry, Neodymium, Visualization, Beam splitters

Read Abstract +

Proceedings Article | 18 August 2014 Paper

Reduction of the stagnation effect by combined iterative and deterministic single beam phase retrieval techniques

Konstantinos Falaggis

Proceedings Volume 9203, 92030U (2014) https://doi.org/10.1117/12.2061995

KEYWORDS: Phase retrieval, Reconstruction algorithms, Spatial frequencies, Signal to noise ratio, Contrast transfer function, Interferometry, Error analysis, Wave propagation, Cameras, Light wave propagation

Read Abstract +

Proceedings Article | 1 May 2014 Paper

Optimum phase retrieval using the transport of intensity equation

J. Martínez-Carranza, K. Falaggis, T. Kozacki

Proceedings Volume 9132, 91320T (2014) https://doi.org/10.1117/12.2052561

KEYWORDS: Signal to noise ratio, Phase retrieval, Neodymium, Error analysis, Solids, Computer simulations, Ions, Linear filtering, Chemical elements, Numerical analysis

Read Abstract +

Proceedings Article | 13 May 2013 Paper

Effect of imposed boundary conditions on the accuracy of transport of intensity equation based solvers

J. Martinez-Carranza, K. Falaggis, T. Kozacki, Malgorzata Kujawinska

Proceedings Volume 8789, 87890N (2013) https://doi.org/10.1117/12.2020662

KEYWORDS: Magnesium, Phase retrieval, Sensors, Mirrors, Signal to noise ratio, Fourier transforms, Matrices, Phase measurement, Interferometry, X-ray astronomy

Read Abstract +

Proceedings Article | 13 September 2012 Paper

Accurate and quantitative phase retrieval methods for a series of defocused images with application to in-line Gabor microscopy

Konstantinos Falaggis, Tomasz Kozacki, Michal Jozwik, Malgorzata Kujawinska

Proceedings Volume 8493, 84930X (2012) https://doi.org/10.1117/12.929303

KEYWORDS: Cameras, Spatial frequencies, Sensors, Phase retrieval, Holography, Holograms, Digital holography, Microscopes, Phase measurement, Spatial resolution

Read Abstract +

Proceedings Article | 13 September 2012 Paper

Generalized theory of phase unwrapping: approaches and optimal wavelength selection strategies for multiwavelength interferometric techniques

Konstantinos Falaggis, David Towers, Catherine Towers

Proceedings Volume 8493, 84930O (2012) https://doi.org/10.1117/12.929874

KEYWORDS: CRTs, Interferometers, Interferometry, Reliability, Phase interferometry, Phase measurement, Fringe analysis, Optical metrology, Optimization (mathematics), Metrology

Read Abstract +

Proceedings Article | 3 November 2011 Paper

Unified theory of phase unwrapping approaches in multiwavelength interferometry

Konstantinos Falaggis, David Towers, Catherine Towers

Proceedings Volume 8011, 80117H (2011) https://doi.org/10.1117/12.902646

KEYWORDS: CRTs, Interferometry, Interferometers, Reliability, Phase interferometry, Phase measurement, Optical metrology, Optimization (mathematics), Metrology, Nickel

Read Abstract +

Proceedings Article | 3 June 2011 Paper

Extended range metrology: an age old problem

Catherine Towers, David Towers, K. Falaggis

Proceedings Volume 8082, 80821P (2011) https://doi.org/10.1117/12.893283

KEYWORDS: Interferometry, Metrology, Phase measurement, Reliability, Fringe analysis, Error analysis, 3D metrology, Interferometers, Coherence (optics), Inspection

Read Abstract +

Proceedings Article | 3 August 2010 Paper

Theoretical analysis and optimisation of the method of excess fractions for long-range metrology

Konstantinos Falaggis, David Towers, Catherine Towers

Proceedings Volume 7790, 779009 (2010) https://doi.org/10.1117/12.861177

KEYWORDS: Interferometers, Reliability, Metrology, Interferometry, Phase measurement, Tantalum, Systems modeling, Nickel, Performance modeling, Sensors

Read Abstract +

Proceedings Article | 11 August 2008 Paper

A hybrid technique for ultra-high dynamic range interferometry

Konstantinos Falaggis, David Towers, Catherine Towers

Proceedings Volume 7063, 70630X (2008) https://doi.org/10.1117/12.795293

KEYWORDS: Fiber Bragg gratings, Interferometers, Interferometry, Metrology, Phase measurement, Signal detection, Distance measurement, Michelson interferometers, Reliability, Optical amplifiers

Read Abstract +

Proceedings Article | 11 August 2008 Paper

Optimum wavelength selection for the method of excess fractions

Konstantinos Falaggis, David Towers, Catherine Towers

Proceedings Volume 7063, 70630V (2008) https://doi.org/10.1117/12.795211

KEYWORDS: Fiber Bragg gratings, Reliability, Interferometers, Interferometry, L band, Signal detection, Metrology, Optical amplifiers, Distance measurement, Ferroelectric materials

Read Abstract +