B.I. Stahl

Subterahertz superlattice parametric oscillator

We report a superlattice parametric oscillator (SPO), with a GaAs/AlAs superlattice as the active element. The SPO was pumped by a microwave field (power 4 mW) and produced third harmonic radiation at subterahertz frequencies (near 300 GHz; 0.1 mW). We attribute the parametric gain to the nonlinearity of the miniband transport.

Semiconductor-Superlattice Parametric Oscillator as a Subterahertz and Possible Terahertz Radiation Source

We describe the operation of a semiconductor-superlattice parametric oscillator (SPO) at a subterahertz frequency (near 300 GHz). The oscillator is driven by a microwave source (frequency near 100 GHz). We also present an analysis indicating that operation at frequencies above 1 THz should be possible. The SPO is based on the ability of conduction electrons in a superlattice to perform Bloch oscillations. Broadband tunability as well as the monochromacy of a driving microwave field are transferred to the SPO.

Semiconductor-superlattice higher harmonic oscillator for generation of millimeter waves

This paper presents a GaAs/AlAs superlattice higher harmonic oscillator for generation of millimeter waves. The oscillator operated on the second harmonic around 130 GHz and was tunable by about 10 percent. Driven with a dc power of 30 milliwatts, the output power was about 10 microwatts.

Semiconductor superlattice frequency multiplier for the submillimeter wavelength range

A report on a semiconductor superlattice frequency multiplier for generation of submillimeter waves is presented. The principle is based on the nonlinearity of the miniband transport in a GaAs/AlAs superlattice. Pump radiation around 100 GHz is used. The frequency multiplication is demonstrated by studying the emission spectrum with a Fabry-Perot interferometer and by investigating an absorption line of methanol gas.