Ottawa, Canada
Ottawa, Canada

Time filter

Source Type

We demonstrate a novel method to measure circular birefringence (CB) and linear birefringence (LB) present simultaneously in the device under study. By using a π-shifted Sagnac interferometer, the scheme eliminates the dependence on incoming polarization and on the orientation angle of the linear birefringence. Moreover, due to different handedness symmetry/response of CB and LB to counter-propagating waves, the technique allows us to control the relative influence of the two birefringences leading to a requirement of only two measurements to determine both of them. Thus, comparing to Stokes polarimeters and other methods, our scheme has advantages when characterizing media containing both birefringences. Our findings are experimentally confirmed. © 2017 Optical Society of America.


The International Nurses Association is pleased to welcome M. Anne Slater, RN, to their prestigious organization with her upcoming publication in the Worldwide Leaders in Healthcare. M. Anne Slater is a Registered Nurse with more than 34 years of experience in her field and an extensive expertise in all facets of nursing, especially gastrointestinal and camp nursing. She is currently serving patients in Ontario, Canada. M. Anne Slater gained her Nursing Degree in 1982 from Algonquin College in Ottawa, Ontario, becoming a Registered Nurse. Since graduating, she has completed a number of advanced training courses while practicing as a nurse. To keep up to date with the latest advances in nursing, M. Anne Slater maintains a professional membership with the College of Nurses of Ontario and the Registered Nurses Association of Ontario. She says that her success is thanks to being a team player and problem solver, and she loves managing, mentoring and training new staff and nurses. When she is not working, M. Anne Slater enjoys reading, knitting, skiing and biking. Learn more about M. Anne Slater here: http://inanurse.org/network/index.php?do=/4136144/info/ and be sure to read her upcoming publication in Worldwide Leaders in Healthcare.


Daria Olah, REALTOR®, Oak Realty Ltd., has joined The Expert Network©, an invitation-only service for distinguished professionals. Ms. Olah has been chosen as a Distinguished Real Estate Professional™ based on peer reviews and ratings, dozens of recognitions, and accomplishments achieved throughout her career. Ms. Olah outshines others in her field due to her numerous awards and recognitions, and outstanding customer service. She attended Nipissing University in Ontario and graduated with a bachelor’s degree in Criminal Justice. She went on to receive a Veterinarian Certificate from Algonquin College as well as a Counseling Certificate. Ms. Olah also holds a Teaching Certificate from York University and previously taught elementary school children where she was tasked with listening to and understanding student needs to help them grow and achieve their goals. Ms. Olah brings a wealth of knowledge to her industry, and, in particular, to her area of expertise, the real estate market of Ontario's Elliot Lake. When asked why she decided to pursue a career in real estate, Ms. Olah said: "I love to stay busy. Because of my strong work ethic, I was essentially looking at the careers where the harder I'd work, the more success I would have. Real estate provided me with this opportunity." After spending ten years exploring different career paths outside of the real estate industry, Ms. Olah ultimately returned to her original passion and hasn’t looked back since. Her understanding of the Algoma District and its surrounding communities have fueled her work as a REALTOR®, allowing her to find quick success on her professional path while continuing her lifelong goal of helping people. As a thought-leader in her field, Ms. Olah keeps an eye on industry trends and developments in the local Ontario market. In particular, she has been paying close attention to the recent influx of buyers coming from the Toronto area. She noted: "We have noticed a large increase of buyers from down South. Elliot Lake is known to many as a retirement community and it is easier to find affordable houses here as opposed to most other towns/cities. I find that having a good grasp of the area is very important, especially with those buyers who don't know Elliot Lake and what it has to offer. With a population of only about 11,500, Elliot Lake has a lot to offer. For example, we offer an 18 hole championship golf course, municipal pool, ski hill, many lakes for fishing, and beautiful trails for hiking." After only Residing in Elliot Lake since 2013, Ms. Olah has worked extremely hard to establish herself in the community, offering outstanding customer service and superior marketing. Ms. Olah's core values include trustworthiness, hard work and diligence. Her positive attitude coupled with her genuine care for clients and strong willingness to go that extra mile has accelerated into profound success within only a short period of time. Ms. Olah also exercises a desire to give back to the community and donates to the local animal shelter (Society for Animals in Distress) from every sale she makes. Moving forward, Ms. Olah plans to build upon her reputation as one of the top selling agents in the region with an eye toward increasing her sales numbers each year and solidifying her presence in Elliot Lake’s real estate market. Ms. Olah enjoys spending time with family and friends, being active and being involved with continued success in the real estate industry. The Expert Network© has written this news release with approval and/or contributions from Daria Olah. The Expert Network© is an invitation-only reputation management service that is dedicated to helping professionals stand out, network, and gain a competitive edge. The Expert Network selects a limited number of professionals based on their individual recognitions and history of personal excellence.


Khonina S.N.,Russian Academy of Sciences | Golub I.,Algonquin College
Journal of the Optical Society of America A: Optics and Image Science, and Vision | Year: 2013

A simple roadmap is established for the construction of the smallest three-dimensional (3D) isotropic focal spots. It is achieved in a 4Pi configuration by imposing a restriction/condition of equal transverse and longitudinal spot sizes to determine the position of an annular aperture and then optimize its size. The calculations were performed for cylindrically symmetric radial, azimuthal, and circular polarizations for the cases of in-phase and out-of-phase counter-propagating beams as well as when a vortex was added to the beams. A diffraction-limited bright 3D isotropic spot containing solely longitudinal or transverse electric field components is obtained, while the 3D dark spot can be formed from one of two complementary combinations, each containing both transverse and longitudinal field components. © 2013 Optical Society of America.


Khonina S.N.,Russian Academy of Sciences | Golub I.,Algonquin College
Optics Letters | Year: 2011

We show that, by adding a π-phase shift to one-half of a linearly polarized beam, the roles of the transversal and longitudinal field components of the focused beam are interchanged, resulting in better focusing of the longitudinal component in the direction perpendicular to the phase jump line. For this component the scheme produces a spot with FWHM > 15% smaller than a spot generated with either linearly or radially polarized light for any NA. The scheme has a similar advantage when applied to circularly polarized light, and it holds for both a plane wave and a realistic case of a Gaussian incident beam. This technique may find applications when using recording media responsive to the longitudinal field only, particularly in read/write for optical storage where the resolution in one transverse dimension is most important. © 2011 Optical Society of America.


Khonina S.N.,Russian Academy of Sciences | Golub I.,Algonquin College
Journal of the Optical Society of America A: Optics and Image Science, and Vision | Year: 2012

We compare different beam combinations for stimulated emission depletion microscopy. The four considered copolarized, mutually symmetric, but complementary write + erase beam combinations are circularly polarized beam + circularly polarized vortex with charge +1 or -1, azimuthally polarized with a vortex + azimuthally polarized, and radially polarized beam + radially polarized with a vortex. The resulting fluorescent spot was calculated for plane incident pump and erase beams, for plane waves with added high NA annular ring apertures, and when both incident beams were optimized with amplitude-phase masks. For all three incident wave cases, the azimuthal polarization combination consistently produces spots 15%-C30% smaller than the commonly used, circularly polarized light combination (the first from above). The two other polarization combinations produce even smaller, of the order of nanometers /0.003λ, fluorescent spots with a caveat of having nonzero erase beam intensity in the center. Nevertheless, these combinations can be advantageous when exploiting PF, i.e., using molecules that respond solely to the longitudinal (or only to transversal) component of the illuminating field. © 2012 Optical Society of America.


Khonina S.N.,Russian Academy of Sciences | Golub I.,Algonquin College
Journal of the Optical Society of America A: Optics and Image Science, and Vision | Year: 2012

We compare generation of a dark spot using focusing of beams with azimuthal polarizion, radial polarization with a vortex, and a circular polarization with either a first or second order vortex. By optimization of the amplitudephase pupil, it is ascertained that azimuthal polarization is the most suitable one to obtain the diffraction bounded dark spot per se whose scalar approximation limit has FWHM = 0.29λ. Consequently, for dark spot generation, this polarization plays the role of the radial polarization in creation of the diffraction-limited bright spot. Using azimuthal polarization, it is shown that an amplitude-phase filter allows generation of a subdiffractive dark spot in a prescribed finite area. © 2012 Optical Society of America.


Golub I.,Algonquin College | Exir H.,Algonquin College
Optics Letters | Year: 2013

We present a left-right symmetry restoring method, which removes the detrimental birefringence in the singlemode fiber Sagnac interferometer, achieved with the aid of a half waveplate oriented at a specific angle. We show theoretically and demonstrate experimentally that adding a π-shift between clockwise and counterclockwise propagating, horizontally (in fiber loop plane) polarized field components, the Sagnac loop mirror's reflection becomes independent on birefringence of an element placed in the loop. © 2013 Optical Society of America.


Golub I.,Algonquin College | Chebbi B.,Laurentian University | Shaw D.,Algonquin College | Nowacki D.,Algonquin College
Optics Letters | Year: 2010

We show that it is feasible to design and manufacture a refractive logarithmic axicon that generates a quasi-diffraction-free/Bessel beam with nearly constant beam size and intensity over a predetermined range. The novel optical element was characterized with both coherent and incoherent light, and good correspondence with the predicted behavior of the intensity distribution and spot size was found. The energy flow was also found to be nearly constant over most of the designed range. Logarithmic axicons may find applications in situations where large depth of field and uniform axial intensity/energy distributions are important. © 2010 Optical Society of America.


News Article | April 17, 2016
Site: www.topix.com

Algonquin College mechanical engineering student Joseph Dupuis - whose off-the-grid cabin went viral last spring - displays an early prototype of his solar tracking device in September 2015. A local entrepreneur who made global headlines for his off-the-grid home last year is getting ready to unveil his latest unconventional solution in sustainable energy.

Loading Algonquin College collaborators
Loading Algonquin College collaborators