Teraxion Inc.

Art Recherches Et Technologies Avancees Inc./art Advanced Research Technologies, Inc.

Alain Mailloux

Yves Painchaud

Simon Savard

Richard L Lachance

H&eacute;l&egrave;ne Chotard

A method for aligning the spectral responses of two comb-like optical filters is provided. This method does not necessitate the use of spectrally-resolved equipment, as it uses the optical power correlation profile of a broadband light signal representative of the combined spectral responses of the two filters. In one embodiment, the power correlation profile is compared to a pre-stored profile. A tuning method for tuning two filters using this alignment method is also provided. The two filters are first relaxed to an unstretched position, and the second filter is stretched and aligned with the first. The first filter is also stretched and aligned with the other. Both filters are then stretched at a calibrated value.

Methods for the alignment and calibration of the spectral responses of optical filters

A method and an apparatus for recording optical gratings in a photosensitive medium are provided. The invention uses a phase mask in combination with a scanning of the recording light beam. The phase mask, or alternatively the photosensitive medium, is translated along a direction parallel to the scanning of the light beam, so that the period of the recorded grating may be locally adjusted. To ensure a proper recording efficiency over a large range, an appropriately selected wavefront curvature is provided in the light beam. The method of the invention is particularly advantageous for the recording of superimposed grating components in a photosensitive medium.

Method and apparatus for recording an optical grating in a photosensitive medium

A scanning module for imaging through scattering media is provided. The scanning module image through scattering media while alleviating adverse effects of the weak transmission through highly scattering media. The injection of photons is optimized so that the overall transmission is increased compared to the conventional art. Cross-talk effects in a multi-port geometry are eliminated thereby increasing parallelism.

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Québec, Canada

Alain Mailloux