Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1990-12-13
1992-01-07
Laroche, Eugene R.
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359247, 359254, 359285, G02F 103, G02F 111
Patent
active
050796429
ABSTRACT:
There is provided by this invention an electro-optic modulator for damping acoustical energy produced by an electro-optic crystal. The modulator couples acoustic energy from the electro-optic crystal to an acoustic coupler due to the matching acoustic impedances of the coupler and the crystal. The coupler transmits the acoustic wave to the acoustic damper which dampens the acoustic energy. The coupler linearly decreases in height in a direction away from the crystal so that the acoustic wave is reflected through more than one damper prior to returning to the crystal, thus further decreasing acoustical energy. Another feature of this invention is the geometrical design of the electro-optic crystal which has two of its faces, which are not attached to a coupler, positioned not to be perpendicular with a face attached to a coupler. This design of the crystal allows for all acoustic waves, even if directed toward a face which does not have an attached coupler, to be reflected toward a face having an attached coupler so that they can be coupled from the cavity and damped. A further feature of this invention is the use of material from the damper in the bonding material between the coupler and the damper so that a gradient interface is formed so that more efficient transmission to and from the damper is obtained.
REFERENCES:
patent: 3663091 (1972-05-01), Lee
Dreisewerd Doug W.
Haack John A.
Rigney Thomas F.
Courson Timothy H.
Gosnell Guy R.
Hudson, Jr. Benjamin
LaRoche Eugene R.
Lester Evelyn A.
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