Dr. Martín M. A. Núñez Velázquez Profile

Dr. Martín M. A. Núñez Velázquez

Director of product development at Coractive

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Publications (6)

Proceedings Article | 2 March 2020 Paper

Optical fibers fabricated from 3D printed silica preforms

Angeles Camacho Rosales, Martin M. Núñez Velázquez, Xiao Zhao, Jayanta Sahu

Proceedings Volume 11271, 112710U (2020) https://doi.org/10.1117/12.2543210

KEYWORDS: Silica, Optical fibers, Laser sintering, 3D printing, Glasses, Additive manufacturing, Particles, Printing, Structured optical fibers

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Proceedings Article | 21 February 2020 Paper

Efficient cladding pump Tm:Ho co-doped fiber laser for operation in the 2.1 microns region

Norberto Ramírez Martínez, Martín M. Núñez Velázquez, Jayanta Sahu

Proceedings Volume 11260, 112600H (2020) https://doi.org/10.1117/12.2546007

KEYWORDS: Fiber lasers, Thulium, Cladding, Holmium, Absorption, Semiconductor lasers, Ions, Aluminum, Diodes, Fabrication

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Proceedings Article | 18 February 2020 Paper

Enhancing the nonlinear functionality of step-index silica fibers through the combination of thermal poling and 2D materials

F. De Lucia, A. Lewis, R. H. Bannerman, N. Englebert, M. M. Nunez Velazquez, C.-C. Huang, J. Gates, S.-P. Gorza, J. Sahu, F. Leo, D. Hewak, P. J. Sazio

Proceedings Volume 11282, 1128212 (2020) https://doi.org/10.1117/12.2544140

KEYWORDS: Optical fibers, Cladding, Silica, Glasses, Molybdenum, Electrodes, Thermal effects, Nonlinear optics, Raman spectroscopy, Transition metals

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Thermal poling, a technique to create permanently effective second-order susceptibility in silica optical fibers, has recently been improved by the discovery of an “induction poling” technique¹ and the adoption of liquid electrodes², allowing for poling fibers of any length and geometry. Nevertheless, the nonlinearity created via thermal poling is always limited by the 𝜒⁽³⁾of the optical fiber material and by the maximum electric field that can be frozen inside the glass. For these reasons research is ongoing to determine routes for further improving the nonlinear effects due to the thermal poling process. In this work, we propose to enhance the effects of the thermal poling by exploiting the intrinsic nonlinear properties of some 2D materials³, which are deposited inside the cladding holes of a twin-hole silica fiber. The materials we focused on are 2D Transition Metal Chalcogenide (2D TMDC) MoS₂ and WS₂ and the technique adopted to realize the deposition inside the cladding channels of a twin-hole step index silica fiber consists of a thermal decomposition process4 of the precursor ammonium tetrathiomolybdate (NH4)2MoS⁴ in 6% H₂/Ar flow. The technique has allowed us to uniformly coat the two cladding channels for a length of ≈25 cm with a film nominally consisting in a bi-layer of the 2D materials. A Raman based analysis has been used to test the morphology of the coating. The fiber deposited with 2D materials was later thermally poled and periodically erased via exposure to UV light to reach the QPM condition at a wavelength of ≈1550 nm. The effective 𝜒⁽²⁾ of the fiber was measured via SHG for both the deposited and the pristine fiber, showing an enhancement of the nonlinearity in favor of the deposited one. The phenomenon can be explained by the exploitation of a higher 𝜒⁽³⁾ seen by the pump wave due to the presence of the 2D layer deposited inside the cladding holes and opens the possibility of exploiting the higher intrinsic material 𝜒⁽²⁾, in case of a periodic patterning/synthesis of the TMDC.

Proceedings Article | 27 September 2016 Open Access

From school classes to UNESCO: IYL-enabled environments for tackling the STEM skills shortage through student-led outreach

Matthew Posner, Pearl John, Nicholas H. Wong, Vinita Mittal, Martin Nunez-Velazquez

Proceedings Volume 9946, 994607 (2016) https://doi.org/10.1117/12.2238222

KEYWORDS: Scanning transmission electron microscopy, Photonics, Outreach programs, Video, Optoelectronics, Lead, Physics, Light emitting diodes, Gold, Laser therapeutics

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Proceedings Article | 11 March 2016 Paper

Highly efficient Yb-free Er-La-Al doped ultra-low Na large mode area single-trench fiber laser

Deepak Jain, Shaiful Alam, Yongmin Jung, Pranabesh Barua, Martin Velazquez, Jayanta Sahu

Proceedings Volume 9728, 97280W (2016) https://doi.org/10.1117/12.2211336

KEYWORDS: Fiber lasers, Laser development, Erbium, Fiber amplifiers, Doping, Numerical simulations, Refractive index, Cladding, Laser resonators, Absorption

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Proceedings Article | 6 January 2015 Paper

Characterization of fluorescence lifetime of Tm-doped fibers with increased quantum conversion efficiency

Jakub Cajzl, Pavel Peterka, Pavel Honzátko, Jan Mrázek, Ondřej Podrazký, Filip Todorov, Petar Gladkov, Jayanta Sahu, Miguel Nunez-Velazquez, Pavla Nekvindová, Ivan Kašík

Proceedings Volume 9450, 945017 (2015) https://doi.org/10.1117/12.2070425

KEYWORDS: Optical fibers, Luminescence, Quantum efficiency, Thulium, Nanoparticles, Absorption, Refractive index, Aluminum, Doping, Silica

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