Acousto-optic filter

Details Acousto-optic filter Acousto-optic filter

1974-07-01

1976-04-27

McGraw, Vincent P.

350161, G02F 118, G02F 132

Patent

active

039531074

ABSTRACT:
An acousto-optic filter utilizing the far-off-axis anisotropic Bragg diffraction comprising an optically anisotropic crystal in which a light beam of incidence travels in a direction making a large angle with the crystalline axis and an ultrasonic wave travels in a predetermined direction. In the acousto-optic filter using a paratellurite crystal, the wavelength of the visible light is tuned by changing the frequency of the ultrasonic wave in a low frequency range below 100 MHz. The ultrasonic power required for driving the acousto-optic filter is about 1/500 that of the so far known acousto-optic filters. The bandwidth of the transmitted light can be changed from several angstroms to several hundred angstroms by selecting the incident angle of the light.

REFERENCES:
new Noncollinear...Filter..."In Paratellurite"; Yano et al; App. Phy Lt; Vol. 24 No. 6 Mar. 1974; pp. 256-257.

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