Bell Telephone Laboratories

Ravinder Kumar Jain

Rogers H Stolen

Chinlon Lin

Sigurd Wagner

Arthur Ashkin

John George Bergman, Jr

Devices which emit in the visible region having a metal oxide barrier layer, e.g. magnesium oxide or beryllium oxide, and having a corresponding metal electrode, i.e., a magnesium or beryllium electrode, in addition to a silver electrode are stable at room temperature. The emitted light spectrum is dependent on the voltage applied to the device which emits an orange or green appearing light for the Mg and Be junctions, respectively.

Light emitting tunnel junctions which are stable at room temperature

A tunable radiation source employing the stimulated Raman-scattering process is disclosed. The source generates several orders of Stokes radiation in an optical-fiber oscillator cavity, which Stokes radiation may be independently tuned by incorporating separate tuning elements for the several Stokes orders. Several different arrangements of fiber and tuning elements are disclosed.

Optical fiber Raman oscillator

There is disclosed a time-dispersion tuned Raman oscillator which makes use of the frequency-dependent transit time of Stokes radiation through a long optical fiber. Time-dispersion tuning is effected by synchronizing Stokes radiation of the desired frequency with a pump pulse. This synchronization may be accomplished either by adjusting the delay of the feedback pulse relative to a pump pulse or by adjusting the repetition rate of the pulsed pump laser.

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Matawan, NJ, United States of America

Ravinder Kumar Jain