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Continuous, coherent sub-terahertz radiation arises when a dc voltage isapplied across a stack of the many intrinsic Josephson junctions in aBi2Sr2CaCu2O8+d single crystal. The active junctions produce an equal number ofI-V characteristic branches. Each branch radiates at a slightly tunablefrequency obeying the ac Josephson relation. The overall output is broadlytunable and nearly independent of heating effects and internal cavityfrequencies. Amplification by a surrounding external cavity to allow for thedevelopment of a useful high-power source is proposed.

physical review letters

Broadly Tunable Sub-terahertz Emission from Internal Branches of the  Current-voltage Characteristics of Superconducting Bi2Sr2CaCu2O8+d Single  Crystals