title: High performance terahertz quantum cascade laser sources based on intracavity difference frequency generation.
abstract: We demonstrate high power, room temperature, single-mode THz emissions based on intracavity difference frequency generation from mid-infrared quantum cascade lasers. Dual active regions both featuring giant nonlinear susceptibilities are used to enhance the THz power and conversion efficiency. The THz frequency is lithographically tuned by integrated dual-period distributed feedback gratings with different grating periods. Single mode emissions from 3.3 to 4.6 THz with side-mode suppression ratio and output power up to 40 dB and 65 µW are obtained, with a narrow linewidth of 5 GHz.
authors: Center for Quantum Devices, Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL 60208, USA.
authors: Q Y
authors: QY
authors: Lu
authors: N
authors: N
authors: Bandyopadhyay
authors: S
authors: S
authors: Slivken
authors: Y
authors: Y
authors: Bai
authors: M
authors: M
authors: Razeghi