Ph.D. Elier Ramos Israde
Principal Investigator and Computational Physicist at EARCo. Specializing in nonlinear crystal phase-matching, spontaneous parametric down-conversion (SPDC) engineering and numerical simulation architecture.
Who am I?
Science, Light and Programming
I'm a person that loves challenges, and that path lead me to physics. Fun an challenging. Eventually a Masters and Ph.D. in Light and Quantum Light Sources, that gave me a lot of insight about how to design and build LASERs and Tunable light sources using aperiodically poled crystals like Lithium Niobate and Lithium Tantalate. All linked eventually to its applications for quantum light sources and the process of spontaneous parametric down conversion (SPDC).
I'm also a Senior Software Developer with over 8 years of programming experience on several languages like C#, Python and Typescript. Currently I'm the Technical Leader on a project building an app and webapp under Scio Consulting.
Passion for Science
The process of Parametric Down Conversion, either spontaneous or seeded, can be modeled on the low gain regime as a quantum light source and we can infer a lot of its characte using aperiodically polled crystal designed by using optimization algorithms like Monte Carlo-Metropolis with simulated annealing and genetic algorithms.
Passion for Programming
I'm passionate about writing clean, reproducible mathematical routines. All backed up with full mathematical derivations of the quantum process. As a software developer, I'm addicted to new projects and its challenges that can arise.
B.S. in Physics Engineering
Orientation of Research and Innovation on Green Tech.
M.S. in Optics with orientation in physical optics.
Design and fabrication of a injection seeded laser. Creation of the Nd:YAG laser on every step. Cut of the crystal, design and fabrication of the dielectric mirrors.
Ph.D. in Optics with orientation in physical optics.
Tunable light sources with broadband spectral bandwidths. Design and fabrication of aperiodically polled crystal of LiNbO3 and LiTaO3 for with ultrabroadband capacity generation (supercontinuum) and optimized using Monte Carlo-Metropolis with simulated annealing for optimizing spectral and temporal qualitifations.
Dissertation & Peer-Reviewed Papers
"Tunable light sources with broadband spectral bandwidths."
Non-linear ferroelectric mediums like lithium niobate (LiNbO3) and lithum tantalate (LiTaO3) allow tunable light conversion by using the quasi-phase matching technique, which consist on alternating the sign of the nonlinear coefficient through-out the medium (modulation of the non-linearity), which can be periodic, with chirp or aperiodic. One of the conversion processes, which is known as parametric down conversion (PDC), leads to the generation of emission spectra with wide and continuous bandwidth (greater than 10 nm), called supercontinuum. In this thesis the PDC process was theoretically studied considering the three modulations formerly mentioned. With periodic modulations, the PDC implementation with a pump wavelength tuned to the second order zero-dispersion condition, it is possible the generation of signals with spectral bandwidths above 600 nm. However, this technique doesn't offer tunable flexibility because it is limited to the medium linear properties, and because of it most of these sources emit in the infrared. On the other hand, chirp modulation allows in a simple way the generation of broadband tunable spectra, that could be implemented on an experimental regime under a compensation system, but have the inconvenient that the resulting spectra presents oscillations which cannot be easily suppressed. In these research project, an optimization methodology was proposed based on Monte Carlo-Metropolis with simulated annealing that allows to define crystal designs with aperiodic modulations that could generate wave-packets in one photon states that exhibit broad spectral bandwidth and temporal desirable properties. For the study was considered the material congruent LiNbO3 and were studied different configurations that involve particular pump sources and generation signals. Additionally, on the model there were included the effects of temperature and fabrication defects and the impact on the spectra and the generation rate. Particularly, a crystal with a random design is presented that allows the generation of two photon state with broad bandwidth that is Fourier transformed limited. The design characterization was made by using the Wigner function on the heralded one photon state.