Scientist Profile

Photo

Percival F. Almoro

Best Ph.D. Dissertation (2005)

Expertise: Optics & Optoelectronics, Nondestructive Testing, Phase Retrieval, Speckle Interferometry, Holography, Coherent Metrology, Lasers, Optics, Photonics, Fringe Processing

Dr. Percival F. Almoro is recognized for his important contributions in the field of professor at the National Institute of Physics (NIP), University of the Philippines Diliman and is a UP scientist 1. He is currently the deputy director for facilities and resources of the institute. He obtained his Ph.D. Physics at the NIP in 2004 and carried out post-doctoral research fellowships at the Institute of Applied Optics, Universität Stuttgart, Germany from 2005 until 2006, Risø National Research Laboratory, Kingdom of Denmark from 2007 until 2009 and at the Center of Optical Research and Education, University of Utsunomiya, Japan in 2014. Dr.Senior Member_Triangle Cool Gray Almoro is a Senior Member of the Optical Society of America (OSA). He is also a Topical Editor of the OSA Applied Optics journal. As topical editor, he is responsible in assigning reviewers and in making decisions on the reviewed manuscripts in specialised fields including but not limited to Interferometry, Holography, Speckle, Statistical Fringe Processing and Nondestructive testing.

Affiliation

Associate Professor III, University of the Philippines, Quezon City, Philippines

Employment

    • National Institute of Physics (NIP), Associate Professor III, 2000 - present

Award

    • U.P. Scientist I, U.P. Scientific Productivity System, 2012-2014
    • Grand Winner, National Academy of Science and Technology – Dep’t. of Science and Technology (NASTDOST) – DuP, 2005
    • Awardee, DOST-Phil. Council for Advanced Science and Technology Research and Development, 2005
    • Best Ph.D. Dissertation, DOST-Phil. Council for Advanced Science and Technology Research and Development, 2005
    • Awardee, First U.P. System Advanced Technology Award, 2005
    • Awardee, Gawad Tsanselor, 2005

Papers Presented

    • Complete deformation analysis of transparent samples using digital shearography and holography, Ninth International Symposium on Laser Metrology, Volume: 7155
    • Coherence length measurement for ultra-short laser pulses using digital holography and statistical fringe analysis, 7th International Workshop on Advanced Optical Imaging and Metrology, Springer, Nuertingen, Germany
    • 3D shape measurement using deterministic phase retrieval and a partially developed speckle field, SPIE 8384, 83840Q, Baltimore, Maryland, USA
    • Investigation of smooth wave fields using SLM-based phase retrieval and a phase diffuser, 1st EOS Topical Meeting on Micro- and Nano-Optoelectronic Systems, Bremen
    • Reconstruction of wavefront from a photonic crystal fiber using speckle phase retrieval, Photonics 2010, Guwahati, India
    • Complete wavefront reconstruction at infrared wavelength using speckle phase retrieval, European Optical Society (EOS) Annual Meeting
    • Comparison and unification of speckle-based phase retrieval and holography with applications in phasefront alignment and recognition, The 6th International Workshop on Advanced Optical Metrology, Nürtingen, Germany, Springer
    • Computerized laser wavefront alignment with aberration correction using a speckle-based phase retrieval method, Technical Digest of the 3rd International Symposium on Photoelectronic Detection and Imaging
    • Phase error correction in wavefront curvature sensing via phase retrieval San Diego, U.S.A., SPIE 7064, 70640F
    • Power loss due to beam splitter cascade in the simultaneous sampling of a volume speckle field for phase retrieval, SPIE 7155, 71551J
    • Complete deformation analysis of transparent samples using shearography and holography, SPIE 7155, 715536
    • Phase retrieval using a random amplitude mask for wavefront sensing, SPIE 6617, 66170J
    • Wave front phase and amplitude reconstruction techniques using multi-intensity patterns, SPIE 6341, 63411C
    • Thickness evaluation for volume refractive objects using phase maps and statistics-based localization, 31st Samahang Pisika ng Pilipinas (SPP) Physics Congress, Cebu City
    • Dynamic Referencing in Pinhole Scanning Phase Retrieval, 31st SPP Physics Congress, Cebu City
    • Wavefront reconstruction with denoising using lateral displacements of a random phase mask, 31st SPP Physics Congress, Cebu City
    • Digital watermarking of retrieved phase maps, 31st SPP Physics Congress, Cebu City
    • Coherence evaluation for femtosecond lasers using digital holography and statistical fringe analysis, 31st SPP Physics Congress, Cebu City
    • Digital watermarking of reconstructed wavefronts via mutliple-plane phase retrieval technique, NIP BS Applied Physics thesis
    • Pinhole phase retrieval and dynamic referencing, NIP BS Applied Physics thesis
    • Holograms for the Investigations of 3-D objects, Compressive Stress Loading and Sub-Surface Defects, 80th National Research Council of the Philippines (NRCP) General Membership Assembly, Manila
    • Coherence length measurement for femtosecond lasers using digital holography and statistical fringe analysis, 30th Samahang Pisika ng Pilipinas (SPP) National Physics Congress
    • Watermarking of reconstructed wavefronts, 30th SPP
    • Interferometric evaluation using deterministic phase retrieval and speckle illumination, 30th SPP
    • Wavefront reconstruction using single-beam phase-shifting speckle illumination, 30th SPP
    • Precise reconstruction distance in digital holography using focus quantifiers, 30th SPP
    • Axial Localization of Phase Objects Using a Statistical Contrast Algorithmq, 30th SPP
    • Rough object distance measurement and fringe localization using focus measures, 29th SPP National Physics Congress, NIP-U.P. Diliman
    • Enhanced characterization of sub-surface defects using fringe-shifted shearograms, 29th SPP
    • Optical vortex tracking using standard deviation of phase maps with application in deformation analysis, 29th SPP
    • Interferometric vibration detection using fringe visibility quantifier, 29th SPP
    • Deformation analysis using spatial evolution of fringe densities, 29th SPP
    • Let there be diffused light: Novel methods for object wavefront reconstruction, 29th SPP
    • Enhanced detection of sub-surface defects using statistical variation of numerically phase-shifted shearograms, 31st PAASE Symposium, NIP-U.P. Diliman
    • High Resolution Technique for the Evaluation of Object Tilt and Rotation Using Amplitude Variance of Reconstructed Wavefronts, 31st PAASE
    • A Statistical Approach to Object Localization in Digital Holographic Microscopy in the Presence of Residual Aberration, 31st PAASE
    • Computer Generated Holograms of Optical Vortices, 31st PAASE NIP-U.P. Diliman
    • 3D tracking of Optical Vortices using a Statistical Algorithm for Phase Map Analysis, 31st PAASE
    • Enhanced strain analysis using statistics of axial shearograms, 78th National Research Council of the Philippines (NRCP) General Membership Assembly, Manila
    • Enhanced object localization using axial variation of phase maps, 78th NRCP, Manila
    • Phase map analysis using axial behavior of reconstructed wavefronts, NIP Masteral thesis (as adviser)
    • Enhanced object localization using axial variation of reconstructed phase maps, Victor Angelo Gonzalez
    • Effects of Illumination Wavelength and Diffuser Roughness Height on Speckle Formation and Phase Retrieval, 28th Samahang Pisika ng Pilipinas (SPP) (Physical Society of the Philipines) National Physics Congress, Antipolo City
    • Object boundary detection using speckle-based phase retrieval, 28th SPP
    • Wavefront sensing using correlations of two speckle intensity measurements and a Shack Hartmann-based algorithm, 28th SPP
    • Shearographic inspections of glossy objects and transparent materials using speckle illumination and a diffuser, NIP Undergraduate thesis
    • Evaluation of a Diffusing Mask as Speckle Generator in Digital Shearography, 27th SPP, Tagaytay City, Philippines
    • Development of a Simplified Model for Deformation and Strain Analyses via Digital Shearography, Proc. 27th SPP
    • Quantization Analysis and a Design for Parallel Speckle Recording for Phase Retrieval using a Volume Speckle Field, Proc. 27th SPP
    • 3D Object Slope Measurement Using a Geometric Model of Digital Shearography, 29th Annual Philippine–American Academy of Science and Engineering Meeting and Symposium–Ateneo de Manila University, Quezon City
    • Automated Strain Analysis of Transparent Samples Using Shearography and a Diffusing Mask, 29th Annual Philippine–American Academy of Science and Engineering Meeting and Symposium–Ateneo de Manila University, Quezon City
    • Quantization analysis and a design for parallel speckle recording for phase retrieval using a volume speckle field, NIP Undergraduate thesis
    • Quantization analysis and a design for parallel speckle recording for phase retrieval, 76th NRCP, Manila Hotel
    • Phase retrieval based on the constraints taken from parallel capture of intensity patterns of a volume speckle field, National Physics Congress, Samahang Pisika ng Pilipinas (SPP)
    • Strain analysis of transparent samples using digital shearography and holography, SPP
    • Characteristics of amplitude masks for wavefront sensing, SPP
    • Influence of CCD pixel size on sampling of volume speckle field for phase retrieval, SPP
    • Frequency analysis of phase retrieval using a volume speckle field, U.P.
    • Application of digital shearography in the analyses of surface deformation and photoelastic strain, SPP
    • Height sensitivity in 3D object shape measurement using dual-illumination phase shifting digital holography, SPP
    • Three-dimensional optical shape measurement using dual-illumination phase-shifting digital holography, U.P
    • Deformation analysis using Lensless Fourier digital holography, U.P
    • Phase retrieval using a volume speckle field and synthetic apertures, SPP
    • A technique to control chromatic dispersion of full-color digital hologram reconstructions, SPP
    • Full-color digital holography, U.P
    • Multicolor three-dimensional microscopy with digital holography, U.P
    • In-line semiconductor laser with optical feedback, U.P.
    • Pulsed full-color digital holography using hydrogen Raman shifter, U.P.
    • Measurement of three-dimensional deformations using phase-shifting digital holographic interferometry, Science Diliman
    • Pulsed multicolor digital holography using hydrogen Raman shifter, SPP
    • Digital holographic microscopy, SPP
    • Digital holograms for beginners, SPP
    • Phase-shifting digital holographic interferometry, U.P.
    • Digital holography with a 635nm semiconductor laser diode, U.P.
    • Surface profiling of silicon wafers using digital speckle pattern interferometry, SPP
    • Effects of hologram size on image quality, SPP
    • Holography using a 639nm laser diode and a digital photo-camera, SPP
    • Reconstruction of 3-D objects via phase-shifting digital holography, SPP
    • Measurement of 3-D deformations using phase-shifting digital holographic interferometry, SPP
    • Optical recognition of fingerprints, SPP
    • Application of optical correlation in fingerprint identification, U.P.
    • Optical correlation using Van der Lugt holographic filters, U.P.
    • Optical pattern recognition using holographic films, SPP
    • Holographic studies on human femur with internal fixations, SPP
    • Detection of sub-surface defects in vinyl tiles using double-exposure holographic interferometry, SPP
    • Measurement of solid object deformation using double-exposure holographic interferometry, U.P.
    • Evaluation of printed circuit boards using double-exposure holographic interferometry, spp
    • Measurement of microscopic deformations using double-exposure holographic interferometry and the Fourier transform method, Science Diliman

Education

    • University of the Philippines, Quezon City, Philippines, Ph.D. Physics, 2004
    • Institut für Technische Optik, Universität Stuttgart, Germany, Postdoctoral fellowships, 2006
    • DTU-Fotonik, Danmarks Tekniske Universitet, Denmark, Postdoctoral fellowships, 2009
    • Center for Optical Res. and Educ., Univ. of Utsunomiya, Hitachi Fellow, Japan, Postdoctoral fellowships, 2014

Publication

    • Percival F. Almoro, Giancarlo Pedrini, Phanindra N. Gundu, Wolfgang Osten, Steen G. Hanson, (2011) Enhanced wavefront reconstruction by random phase modulation with a phase diffuser
    • Optics and Lasers in Engineering - OPT LASER ENG , vol. 49, no. 2, pp. 2011 Volume 49
    • Filipinas, J.C., Almoro, P.F., (2011) Fringe localization using focus measure
    • Optics Letters Volume 36
    • Percival F. Almoro, Giancarlo Pedrini, Phanindra N. Gundu, Wolfgang Osten, Steen G. Hanson, (2011) Enhanced wavefront reconstruction by random phase modulation with a phase diffuser
    • Optics and Lasers in Engineering - OPT LASER ENG Volume 49
    • Maallo, A.M.S., Almoro, P.F., (2011) Numerical correction of optical vortex using a wrapped phase map analysis algorithm
    • Optics Letters / DOI: 10.1364/OL.36.001251 Volume 36
    • Percival F. Almoro, Giancarlo Pedrini, Phanindra N. Gundu, Wolfgang Osten, Steen G. Hanson, (2010) Phase microscopy of technical and biological samples through random phase modulation with a diffuser
    • Optics Letters Volume 35, No. 7
    • Justine Patricia L. Carpio, (July 2014) Wavefront watermarking of technical and biological samples using digital random phase modulation and phase retrieval
    • Journal of Modern Optics
    • Esmerando Escoto, Joselito Muldera, Lean Dasallas and Elmer Estacio, (2014) Mapping of Temporal Coherence Function for Ultrafast Lasers via Statistical Fringe Analysis of Reconstructed Phase Maps
    • Optics Communications
    • Francesca Celine I. Catalan, (2013) Deterministic phase retrieval interferometry
    • Optics Communications
    • Giancarlo Pedrini, Wolfgang Osten, and C.S. Narayanamurthy, (2013) Analysis of Bessel beam propagation in free space using digital holographic microscopy
    • Optik - International Journal for Light and Electron Optics
    • Francesca Celine I. Catalan, Anne Margarette S. Maallo, (2012) Fringe analysis and enhanced characterization of sub-surface defects using fringe-shifted shearograms
    • Optics Communications
    • Laura Waller, Mostafa Agour, Claas Falldorf, Giancarlo Pedrini, Wolfgang Osten, and Steen G. Hanson, (2012) Enhanced deterministic phase retrieval using a partially developed speckle field
    • Optics Letters
    • Jae Lord Dexter C. Filipinas, (2012) Vibration detection using focus analysis of interferograms
    • Applied Optics
    • Mostafa Agour and Claas Falldorf, (2012) Investigation of smooth wave fronts using SLM-based phase retrieval and a phase diffuser
    • Journal of the European Optical Society Rapid Publications
    • Jae Lord Dexter C. Filipinas, (2011) Fringe localization using focus measure
    • Optics Letters
    • Anne Margarette S. Maallo, (2011) Numerical correction of optical vortex using a wrapped phase map analysis algorithm
    • Optics Letters
    • Giancarlo Pedrini, Phanindra N. Gundu, Wolfgang Osten, and Steen G. Hanson, (2011) Enhanced Wavefront Reconstruction by Random Phase Modulation with a Phase Diffuser
    • Optics and Lasers in Engineering
    • Giancarlo Pedrini, Fucai Zhang, Anne Margarette S. Maallo, Arund Anand, Phanindra N. Gundu, Wei Wang, Anand Asundi, Wolfgang Osten, and Steen G. Hanson, (2010) Fault-tolerant characterization of phase objects using a speckle-based phase retrieval technique
    • International Journal of Optomechatronics 4
    • Jesper Glückstad and Steen G. Hanson, (2010) Single-plane multiple speckle pattern phase retrieval using a deformable mirror
    • Optics Express 18
    • Anne Margarette S. Maallo and Steen G. Hanson, (2010) Quantization analysis of speckle intensity measurements for phase retrieval
    • Applied Optics 49
    • Giancarlo Pedrini, Phanindra N. Gundu, Wolfgang Osten, and Steen G. Hanson, (2010) Phase microscopy of technical and biological samples through random phase modulation with a diffuser
    • Optics Letters 35
    • Anne Margarette S. Maallo and Steen G. Hanson, (2009) Fast-convergent algorithm for speckle-based phase retrieval and a design for dynamic wavefront sensing
    • Applied Optics 48
    • Phanindra N. Gundu, and Steen G. Hanson, (2009) Numerical correction of aberrations via phase retrieval with speckle illumination
    • Optics Letters 34
    • Giancarlo Pedrini, Arun Anand, Wolfgang Osten, and Steen G. Hanson, (2009) Angular displacement and deformation analyses using a speckle-based wavefront sensor
    • Applied Optics 48
    • Steen G. Hanson, (2009) Object wave reconstruction by speckle illumination and phase retrieval
    • Journal of the European Optical Society Rapid Publications 4
    • Arun Anand, Vani K. Chhaniwal, Giancarlo Pedrini and Wolfgang Osten, (2009) Shape and deformation measurements of 3D objects using volume speckle field and phase retrieval
    • Optics Letters 34
    • Giancarlo Pedrini, Arun Anand, Wolfgang Osten, and Steen G. Hanson, (2008) Interferometric evaluation of angular displacements using phase retrieval
    • Optics Letters 33
    • Steen G. Hanson, (2008) Random phase plate for wavefront sensing via phase retrieval and a volume speckle field
    • Applied Optics 47
    • Steen G. Hanson, (2008) Wavefront sensing using speckles with fringe compensation
    • Optics Express 16
    • Wilson Garcia, and Caesar Saloma, (2007) Colored object recognition by digital holography and a hydrogen Raman shifter
    • Optics Express 15
    • Arun Anand, Giancarlo Pedrini and Wolfgang Osten, (2007) Wavefront sensing with random amplitude mask and phase retrieval
    • Optics Letters 32
    • Giancarlo Pedrini and Wolfgang Osten, (2007) Aperture synthesis in phase retrieval using a volumespeckle field
    • Optics Letters 32
    • Giancarlo Pedrini, and Wolfgang Osten, (2006) Complete wavefront reconstruction using sequential intensity measurements of a volume speckle field
    • Applied Optics 45
    • Marilou Cadatal, Wilson Garcia, and Caesar Saloma, (2004) Pulsed Full-Color Digital Holography with a Hydrogen Raman Shifter
    • Applied Optics 43
    • Abregana, T.J.T., & Almoro, P.F., (2016) Object localization using the statistical behavior of volume speckle fields
    • Optical Engineering Volume 55, No. 12
    • Abregana, T.J., & Almoro, P., (2015) Effects of object spatial frequency on the performance of the multiple-plane phase retrieval method
    • Proceedings of the 33rd Physics Congress of the Samahang Pisika ng Pilipinas, Vigan City
    • Abregana, T.J., Hermosa, N.P., & Almoro, P.F., (2017) Digital micromirror device as amplitude diffuser for multiple-plane phase retrieval
    • Proc. SPIE 10330, Modeling Aspects in Optical Metrology VI, 103300G
    • Abregana, T.J., & Almoro, P.F., (2016) Multiple Diffusers as Agents of Intensity Diversity for Phase Retrieval
    • In: Imaging and Applied Optics 2016, OSA Technical Digest (online) (Optical Society of America), paper JW4A.56
    • Almoro, P.F., & Abregana, T.J.T., (2015) Enhanced axial localization of rough objects using statistical fringe processing algorithm
    • Proc. SPIE 9660, SPECKLE 2015: VI International Conference on Speckle Metrology
    • Abregana, T.J., & Almoro, P.F., (2013) Phase object localization using the statistical behavior of reconstructed wavefronts
    • Proc. SPIE 8883, ICPS 2013: International Conference on Photonics Solutions, 88830D