Westerngeco L.l.p.

Chris Yakymyshyn

Loran D Ambs

An optical geophone or hydrophone for detecting seismic vibrational energy comprising a laser material, which generates a lasing frequency signal, the frequency of which varies in accordance with vibrational energy incident upon the laser material, a light source occurring at an excitation frequency for providing excitation energy incident upon the laser material, so that the laser material emits light at the lasing frequency modulated by the vibrational energy and a fiber optic cable for transmitting the excitation frequency light to the laser material and receiving the frequency modulated lasing frequency for transmission to a receiver. The laser material comprises a first face and a second face, the first face being parallel to the second face. The first face is coated so that it passes substantially all of the lasing frequency light and reflects substantially all of the excitation frequency light. The second face is coated so that the second face reflects substantially all of the lasing frequency light and substantially all of the excitation frequency light. An acoustic amplifier is provided for coupling vibrational energy to the laser material, wherein the vibrational energy is incident upon a side of the laser material orthogonal or parallel to the incidence of the excitation energy.

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Bozeman, MT, United States of America

Chris Yakymyshyn