Distributed feedback terahertz frequency quantum cascade lasers with dual periodicity gratings

Lateral distributed-feedback gratings for single-mode, high-power terahertz quantum-cascade lasers.

We report on terahertz quantum-cascade lasers (THz QCLs) based on first-order lateral distributed-feedback (lDFB) gratings, which exhibit continuous-wave operation, high output powers (>8 mW), and single-mode emission at 3.3-3.4 THz. A general method is presented to determine the coupling coefficients of lateral gratings in terms of the coupled-mode theory, which demonstrates that large couplin...

Tunable terahertz quantum cascade lasers with external gratings.

We demonstrate a frequency tunable external cavity terahertz quantum cascade laser using an abutted antireflection-coated silicon lens to reduce facet reflection and as a beam-forming element, with an external grating providing frequency selective optical feedback. Angle tuning of the grating allows a single longitudinal mode of the laser ridge to be selected, resulting in discontinuous tuning ...

Terahertz generation in mid-infrared quantum cascade lasers with a dual-upper-state active region

Articles you may be interested in Distributed feedback terahertz frequency quantum cascade lasers with dual periodicity gratings Appl. Narrow-band injection seeding of a terahertz frequency quantum cascade laser: Selection and suppression of longitudinal modes Appl. High order sideband generation in terahertz quantum cascade lasers Appl. High frequency modulation of mid-infrared quantum cascade...

Distributed-feedback terahertz quantum-cascade lasers with laterally corrugated metal waveguides.

We report the demonstration of distributed-feedback terahertz quantum-cascade lasers based on a first-order grating fabricated via a lateral corrugation in a double-sided metal ridge waveguide. The phase of the facet reflection was precisely set by lithographically defined facets by dry etching. Single-mode emission was observed at low to moderate injection currents, although multimode emission...

Nanowire terahertz quantum cascade lasers