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6 results on '"Alexandre Doucet"'

2. Vanadium dioxide as a material to control light polarization in the visible and near infrared

Author

Tran Vinh Son, Jacques Thibodeau, Alain Haché, Patrick Cormier, Alexandre Doucet, and Vo-Van Truong

Subjects
Phase transition, Materials science, business.industry, Near-infrared spectroscopy, Phase (waves), 02 engineering and technology, 021001 nanoscience & nanotechnology, Polarization (waves), 01 natural sciences, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, 010309 optics, Metal, Condensed Matter::Materials Science, Optics, Semiconductor, visual_art, 0103 physical sciences, visual_art.visual_art_medium, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, Thin film, 0210 nano-technology, business, Refractive index
Abstract

We report on the possible use of vanadium dioxide to produce ultrathin (

Published
2017

3. Ultrathin high-contrast optical modulators for visible and near infrared applications

Author

Alain Haché, Alexandre Doucet, Jacques Thibodeau, Patrick Cormier, Tran Vinh Son, Phuong Anh Do, and Vo-Van Truong

Subjects
Phase transition, Materials science, business.industry, Near-infrared spectroscopy, 02 engineering and technology, 021001 nanoscience & nanotechnology, Polarization (waves), 01 natural sciences, 010309 optics, Metal, Optics, Optical modulator, Semiconductor, visual_art, 0103 physical sciences, visual_art.visual_art_medium, Thin film, 0210 nano-technology, business, Refractive index
Abstract

We report the theory and experiment of how an ultrathin (

Published
2016

4. Linearly Polarizing Laser Mirror for Q-switched Operation

Author

Alexandre Doucet, Jean-François Bisson, Pandurang V. Ashrit, and Gisia Beydaghyan

Subjects
Glancing angle deposition, Materials science, Extinction ratio, business.industry, Output coupler, Laser, Polarization (waves), law.invention, Optics, law, visual_art, visual_art.visual_art_medium, Optoelectronics, Ceramic, business, Refractive index, Power density
Abstract

A polarizing laser mirror made with glancing angle deposition of TiO2 could withstand a train of 2.7 ns pulses with peak power density of around 800 MW/cm2 and a polarization extinction ratio of 1000 when used as an output coupler of a passively Q-switched (Yb0.1Y0.9)3Al5O12 ceramic laser.

Published
2016

5. Visible and near infrared polarization control with vanadium dioxide

Author

Alexandre Doucet, Jacques Thibodeau, Patrick Cormier, Alain Haché, and Tran Vinh Son

Subjects
Optical pumping, Optics, Materials science, business.industry, Infrared, Near-infrared spectroscopy, Optoelectronics, business, Polarization (waves), Phase modulation, Refractive index, Circular polarization, Visible spectrum
Abstract

Vanadium dioxide, a material used in many filtering and imaging applications in the near-infrared, is shown to possess the capability of modifying the polarization of visible and infrared light.

Published
2015

6. Linearly polarized Q-switched ceramic laser made with anisotropic nanostructured thin films

Author

Alexandre Doucet, Pandurang V. Ashrit, Jean-François Bisson, and Gisia Beydaghyan

Subjects
Birefringence, Materials science, Extinction ratio, business.industry, Materials Science (miscellaneous), 02 engineering and technology, Output coupler, 021001 nanoscience & nanotechnology, Laser, 01 natural sciences, Industrial and Manufacturing Engineering, law.invention, 010309 optics, Optics, law, Physical vapor deposition, 0103 physical sciences, Refractive index contrast, Optoelectronics, Business and International Management, Thin film, 0210 nano-technology, business, Refractive index
Abstract

A polarizing laser mirror was made of an alternating sequence of low and high refractive index layers of titanium oxide using glancing angle deposition (GLAD). Large refractive index contrast and large birefringence, reaching 0.5 and 0.1, respectively, could be obtained from one single raw material by changing the deposition conditions. The laser mirror could withstand a train of 2.7 ns, single-mode pulses at 680 Hz, λ=1030 nm, and peak power density of 670 MW/cm2 when used as an output coupler of a passively Q-switched (Yb0.1Y0.9)3Al5O12 ceramic laser. The polarization extinction ratio was found to be better than 30 dB both in continuous-wave and pulsed regimes. These results indicate that polarizing laser mirrors made from nanostructured thin films with GLAD, in addition to being simple to fabricate, can withstand high pulse energy density.

Published
2016

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