High power, continuous wave, quantum cascade ring laser

Abstract

We demonstrate a quantum cascade ring laser with high power room temperature continuous wave operation. A second order distributed feedback grating buried inside the waveguide provides both in-plane feedback and vertical power outcoupling. Total output power reaches 0.51 W at an emission wavelength around 4.85 μm. Single mode operation persists up to 0.4 W. The far field analysis indicates that the device operates in a high order mode. The magnetic and electric components of the ring-shaped lasing beam are in radial and azimuthal directions, respectively.

Substrate-emitting ring interband cascade lasers

“…In contrast to that, the ring QCL shows an azimuthal orientation of the electric field, which has been also observed in previous studies. 25,31 These experimental results underline the different nature of light generation in interband and intersubband cascade lasers, owing to the character of the optical transitions.…”

Impact of intersubband dispersive gain in semiconductor quantum optics

“…Intersubband emitters like the Quantum Cascade Laser (QCL) are the main source of Mid Infrared Radiation (MIR) delivering high power at room temperature CW operation [1]. On the other hand, regardless of a major effort with continuous increase of the operating temperature [2], THz QCLs still require cryocooling.…”

Multi-wavelength surface emitting quantum cascade laser based on equivalent phase shift

“…Since light generated in laser core is transverse magnetic (TM) polarized, QCLs are not instinctively suitable for vertical cavity but in-plane configuration. Second-order distributed feedback (DFB) gratings, [3][4][5] photonic crystal (PhC) lattices, 6,7 and ring cavity grating 8,9 utilizing their first-order Fourier diffraction are capable of surface emission with spectra and spatial purifications. Among these designs, the fabrication of PhC patterns and ring cavity grating experience a technologically challenging in the device preparation.…”