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- Vincent Marceau, Alexandre April, Michel PichÃ©
- Optics letters
- 2012

Exact closed-form solutions to Maxwell's equations are used to investigate the acceleration of electrons in vacuum driven by ultrashort and nonparaxial radially polarized laser pulses. We show thatâ€¦ (More)

- Harold Dehez, Alexandre April, Michel PichÃ©
- Optics express
- 2012

Optical beams exhibiting a long depth of focus and a minimum spot size can be obtained with the tight focusing of a narrow annulus of radially polarized light, leading to a needle of longitudinallyâ€¦ (More)

- Alexandre April, Michel PichÃ©
- Optics express
- 2010

The Richards-Wolf theory and the complex point-source method are both used to express the phasor of the electric field of tightly focused beams, but the connection between these two approaches is notâ€¦ (More)

- Charles Varin, StÃ©phane Payeur, +9 authors Michel PichÃ©
- 2013

In the past years, there has been a growing interest in innovative applications of radially polarized laser beams. Among them, the particular field of laser-driven electron acceleration has receivedâ€¦ (More)

- Alexandre April
- Journal of the Optical Society of America. Aâ€¦
- 2010

In paraxial optics, the power carried by an optical beam can be accurately calculated by means of the integral of the squared modulus of its electric field over a plane transverse to the propagationâ€¦ (More)

- Alexandre April, Nathalie McCarthy
- Applied optics
- 2008

A method aimed to minimize the impact of spectral aberrations in a monochromator is proposed in which the spectrum of the source of radiation under study is scanned by the rectilinear translation ofâ€¦ (More)

- Alexandre April, Pierrick Bilodeau, Michel PichÃ©
- Optics express
- 2011

A parabolic mirror illuminated with an incident collimated beam whose axis of propagation does not exactly coincide with the axis of revolution of the mirror shows distortion and strong coma. Toâ€¦ (More)

- Alexandre April
- Optics letters
- 2008

Closed-form nonparaxial expressions for optical beams are useful to calculate the fields produced by tightly focused laser beams. Such expressions for elegant Laguerre-Gaussian (eLG) beams that areâ€¦ (More)

- Alexandre April
- Optics letters
- 2008

Expressions for the fields of TM and TE laser beams in free space that are rigorous solutions to Maxwell's equations are given in a closed form. The electric and the magnetic fields are bothâ€¦ (More)

- Alexandre April
- Journal of the Optical Society of America. Aâ€¦
- 2011

The study of the nonparaxial propagation of optical beams has received considerable attention. In particular, the so-called complex-source/sink model can be used to describe strongly focused beamsâ€¦ (More)