We present the realization of a high-phase diffractive axicon using a an SLM that exhibits 10π phase modulation. We compare the results with standard diffractive axicons with only 2π phase modulation. We show that high-phase modulation axicons generate Bessel beams with a shorter range and a smaller radius than standard axicons with the same period. We also find that the higher phase modulation regime provides improved diffraction efficiency since fringing effects are reduced. Dynamic control of Bessel beams is presented, controlled through the phase modulation dynamic range.
The paper has been done in collaboration with our friends at San Diego State University.
Ignacio Moreno and MarÃa Del Mar Sanchez-Lopez are Guest Editors of this special section of the journal, together with Prof. Andrew Forbes and Prof. Yoshio Hayasaky.
The editorial to the Special Section can be read at the following link.
On November 25th, 2019 we organized a workshop entitled ‘Structured Light, Polarimetry and Imaging‘.
The workshop was held at the Institute of Bioengineering of UMH, and we could count with the participation of experts from different groups in Spain working in these related fields. The program can be viewed at the following link.
We thank all the participants and attendees to this extremely interesting and motivating reunion.
We study the diffraction efficiency of linear phase (blazed) diffraction gratings displayed onto SLMs that exhibit a large phase modulation range, reaching a maximum phase modulation of 8pi or 10pi radians. We analyse these effects for their important implications in the Nyquist limit for diffractive elements
The paper has been done in collaboration with our friends at San Diego State University.
In this work we present a method for the efficient experimental generation of arbitrary polarized vector beam modes. The optical system employs two LCOS-SLMs in a common path architecture, avoiding the use of beam-splitters.
We apply a recently proposed random technique to encode complex amplitude values. This encoding technique reconstructs the complex function on-axis, thus avoiding incorporating carrier phases. We demonstrate arbitrary scalar modes encoded onto orthogonal polarization components, whose superposition results in a vector beam mode.
Pascuala GarcÃa participated in the round table as the President of the Group of Women in Physics of the of the Spanish Royal Society of Physics – RSEF.
MarÃa del Mar Sánchez and Guadalupe López also attended the workshop organized by the Area of Women, Optics and Photonics of SEDOPTICA.
The picture shows all the attendees to the workshop.
A special section on Spatial Light Modulators (SLMs) – Devices and Applications will be published in the journal Optical Engineering. Ignacio Moreno and MarÃa Del Mar Sanchez-Lopez are Guest Editors of this special section of the journal, together with Prof. Andrew Forbes and Prof. Yoshio Hayasaky.
The following link leads to the journal Call for Papers.
The deadline for submitting papers is October 15th, 2019. See here the flyer of the OE special section on SLMs.Â
MarÃa del Mar Sánchez-López visited the Group of Optics of the University Jaume I de Castellón (GROC-UJI) to participate as a member of the jury of the Doctoral Thesis of Yessenia Jauregui Sanchez, supervised by Prof. Jesús Lancis and Prof. Enrique Tajahuerce.
Excellent work on single-pixel cameras and imaging through scattering media!
Our new publication is available in OSA Continuum Dynamic control of Bessel beams through high-phase diffractive axicon.
