Dr. Carlos M. Bledt Profile

Dr. Carlos M. Bledt

Graduate Research Associate at Brown University

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Publications (8)

Proceedings Article | 24 February 2017 Presentation + Paper

Mechanically robust cylindrical metal terahertz waveguides for cryogenic applications

Robert Wallis, Riccardo Degl'Innocenti, Oleg Mitrofanov, Joanna Waldie, Carlos Bledt, Jeffrey Melzer, James Harrington, Harvey Beere, David Ritchie

Proceedings Volume 10103, 1010307 (2017) https://doi.org/10.1117/12.2250530

KEYWORDS: Terahertz radiation, Waveguides, Cryogenics, Quantum cascade lasers, Metals, Copper, Picosecond phenomena, Aluminum, Thermography

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Proceedings Article | 20 March 2013 Paper

Design and fabrication of multilayer thin film coated hollow waveguides for enhanced infrared radiation delivery

Carlos Bledt, Jeffrey Melzer, James Harrington

Proceedings Volume 8576, 85760O (2013) https://doi.org/10.1117/12.2019373

KEYWORDS: Dielectrics, Cadmium sulfide, Lead, Multilayers, Thin films, Silver, Waveguides, Reflectivity, Metals, Infrared radiation

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Proceedings Article | 17 February 2012 Paper

Investigation of tapered silver / silver halide coated hollow glass waveguides for the transmission of CO2 laser radiation

Carlos Bledt, Daniel Kopp, James Harrington, Saiko Kino, Yuji Matsuura, Jason Kriesel

Proceedings Volume 8218, 821802 (2012) https://doi.org/10.1117/12.912201

KEYWORDS: Silver, Geometrical optics, Thin films, Reflection, Beam propagation method, Waveguides, Signal attenuation, Carbon dioxide lasers, Dielectrics, Glasses

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Proceedings Article | 1 February 2012 Paper

Silver and silver / polystyrene coated hollow glass waveguides for the transmission of visible and infrared radiation

Carlos Bledt, James Harrington

Proceedings Volume 8218, 821809 (2012) https://doi.org/10.1117/12.912198

KEYWORDS: Silver, Picosecond phenomena, Dielectrics, Thin films, Visible radiation, Terahertz radiation, Waveguides, Thin film deposition, Refractive index, Infrared radiation

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Proceedings Article | 1 February 2012 Paper

Photothermal imaging bundle system for estimating tissue oxygen saturation

Yonat Milstein, Dror Allon, James Harrington, Carlos Bledt, Israel Gannot

Proceedings Volume 8218, 82180D (2012) https://doi.org/10.1117/12.917008

KEYWORDS: Oxygen, Tissues, Imaging systems, Blood, Thermography, Cameras, Cancer, Tissue optics, In vivo imaging, Waveguides

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Proceedings Article | 1 February 2012 Paper

Multilayer silver / dielectric thin-film coated hollow waveguides for sensor and laser power delivery applications

Carlos Bledt, James Harrington, Jason Kriesel

Proceedings Volume 8218, 82180H (2012) https://doi.org/10.1117/12.912196

KEYWORDS: Dielectrics, Thin films, Multilayers, Cadmium sulfide, Lead, Silver, Refractive index, Surface roughness, Reflection, Signal attenuation

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Hollow Glass Waveguides (HGWs) incorporating single dielectric thin film designs deposited on silver coated silica hollow waveguides have been used for low-loss transmission of infrared radiation in the 2 - 14 micrometer region. Silver iodide has traditionally been the material of choice as a dielectric thin film in HGWs, with other dielectric thin film materials such as cadmium sulfide and lead sulfide being used as well. The incorporation of multilayer stacks of alternating low and high refractive index dielectric thin films in HGWs has been theoretically shown to further reduce the optical attenuation. Theoretically, lower losses are achieved when the refractive index contrast of the two thin film materials used is high and the number of films incorporated in the HGW film structure increases. Theoretically, such multilayer dielectric stack designs can give rise to the appearance of 1-D photonic bandgap structures with omnidirectional reflection properties as long as critical design parameters are met and scattering contributions due to surface roughness and similar defects are sufficiently low. This study involves the practical design of multilayer dielectric stacks in HGWs, with lead sulfide as a high refractive index material and cadmium sulfide as low refractive index material. The design, optimization, and processing methodology for achieving low-loss multilayer dielectric stacks in HGWs at desired infrared wavelengths is discussed. Characterization of multilayer dielectric coated HGWs includes FTIR spectroscopy for determining the optical response and infrared laser measurements for determining the optical attenuation properties of said multilayer dielectric stack coated HGWs. The experimental loss dependency of dielectric coated HGWs incorporating such metal chalcogenide materials on the particular thin film materials used and number of dielectric layers incorporated is presented and challenges in the current fabrication methodology are discussed.

Proceedings Article | 4 June 2011 Paper

Hollow core fiber optics for mid-wave and long-wave infrared spectroscopy

Jason Kriesel, Nahum Gat, Bruce Bernacki, Rebecca Erikson, Bret Cannon, Tanya Myers, Carlos Bledt, James Harrington

Proceedings Volume 8018, 80180V (2011) https://doi.org/10.1117/12.882840

KEYWORDS: Waveguides, Quantum cascade lasers, Long wavelength infrared, Mid-IR, Infrared spectroscopy, Fiber optics, Glasses, Infrared radiation, Carbon dioxide lasers, Beam delivery

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Proceedings Article | 17 February 2011 Paper

Hollow waveguides for the transmission of quantum cascade laser (QCL) energy for spectroscopic applications

James Harrington, Carlos Bledt, Jason Kriesel

Proceedings Volume 7894, 789414 (2011) https://doi.org/10.1117/12.881548

KEYWORDS: Quantum cascade lasers, Silver, Waveguides, Spectroscopy, Silica, Hollow waveguides, Long wavelength infrared, Infrared spectroscopy, Glasses, Optical filters

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Showing 5 of 8 publications

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