Bell Telephone Laboratories

Van-Tran Nguyen

Theodoor Charlouis Damen

Chandra K Patel

Erich Gornik

Tao-Yuan Chang

Theodoar Charlouis Damen

A tunable far infrared generator makes use of a four-photon mixing process that cycles among highly excited atomic states, the lowest of which states is reached from the atomic ground state by a visible or ultraviolet photon, and the remainder of which states are connected by transitions in the infrared.

Generation of tunable far-infrared radiation

The invention relates to a high-power tunable infrared source employing a four-photon mixing process, with three input lasers, in which process the output power is resonantly enhanced by exciton states in the conversion medium.

Tunable infrared and far-infrared source by four-photon mixing

An optical polarization rotator is developed for use with infrared radiation using a nonlinear, two-photon interaction in a solid medium. The mechanism employed is resonance dispersion, where the sum frequency of an infrared beam to be rotated and a visible control beam is close to the frequency of a two-photon transition of exciton states, thereby producing different amounts of dispersion for the two orthogonal components of the linearly polarized infrared beam. The result of a phase difference between the two components is a rotation of the plane of polarization of the infrared beam.

Growing community of inventors

Holmdel, NJ, United States of America

Van-Tran Nguyen