Acousto-optic filter with near-ideal bandpass characteristics

G - Physics – 02 – F

Patent

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Details

G02F 1/11 (2006.01) G02B 5/20 (2006.01) G02F 1/125 (2006.01) G02F 1/01 (2006.01)

Patent

CA 2169962

An acousto-optic tunable filter (100) is provided with an acousto-optic interaction profile that results in a frequency response with near-ideal bandpass filter characteristics of near-unity transmission inside the passband and near-zero transmission outside the passband. The acousto-optic interaction profile which results in this frequency response has a phase polarity which alternates and is damped, i.e., the acousto-optic interaction profile has a damped oscillating shape. The physical structure to implement this filter comprises a pair of acoustical waveguides (110, 112) which taper toward each other at the beginning of the profile and then are spaced apart by a constant distance. A damping layer (132) or other damping structure is provided to achieve the damping characteristics of the profile.

Filtre acousto-optique accordable (100) pourvu d'un profil d'interaction acousto-optique donnant lieu à une réponse en fréquence ayant des caractéristiques quasi idéales de filtre passe-bande, c'est-à-dire qu'il y a une transmission proche d'unité à l'intérieur de la bande passante et une transmission sensiblement nulle à l'extérieur de la bande passante. Le profil d'interaction acousto-optique donnant lieu à cette réponse en fréquence présente une polarité de phase alternée et amortie, c'est-à-dire que le profil d'interaction acousto-optique a une forme oscillante amortie. La structure matérielle mettant en oeuvre ce filtre comporte une paire de guides d'ondes acoustiques (110, 112) qui se rapprochent l'un de l'autre au début du profil puis s'étendent à une distance constante l'un de l'autre. Une couche d'amortissement (132) ou une structure d'amortissement analogue est prévue pour assurer les caractéristiques d'amortissement du profil.

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