Coherent 5.35μm surface emission from a GaAs-based distributed feedback quantum-cascade laser

Abstract

Articles you may be interested inSpectral and spatial single mode emission from a photonic crystal distributed feedback laser Appl. Phys. Lett. 90, 121135 (2007); 10.1063/1.2716972Room-temperature, high-power, and continuous-wave operation of distributed-feedback quantum-cascade lasers at λ 9.6 μ m

Surface-emitting THz sources based on difference-frequency generation in mid-infrared quantum cascade lasers

“…10-12 matched the wave vector of a given laser mode, whereas in our devices the grating should match the wave vector of the nonlinear polarization at difference frequency. Furthermore, for devices reported in [10][11][12][13] the gratings strongly affected lasing conditions by introducing additional losses and distributed feedback. Second-order gratings in QCLs with intra-cavity second-harmonic generation also acted simultaneously as a DFB cavity for the laser mode at the fundamental frequency 13 .…”

“…We note that there is an important difference between our surface-emitting THz sources and the surface-emitting DFB QCLs with secondorder gratings demonstrated previously in ref. [10][11][12][13]. The second-order gratings implemented for standard QCLs reported in ref.…”

“…Furthermore, the large emitting area in surface-emitting devices would result in a more directional THz output compared to edge emitting devices. Surface-emitting distributed feedback (DFB) lasers with second-order grating have been demonstrated for regular mid-and far-IR QCLs 10, 11, 12 and for intra-cavity second-harmonic generation in QCLs 13 .…”

Surface-emitting terahertz quantum cascade laser source based on intracavity difference-frequency generation

“…Surface-emitting distributed feedback ͑DFB͒ lasers with second-order grating have been demonstrated for regular mid-IR and far-IR QCLs 9-13 and for intracavity secondharmonic generation in QCLs. 14 In this letter we report on surface-emitting terahertz QCL sources based on intracavity DFG.…”

“…We note, however, that there is an important difference between our surface-emitting terahertz sources and the surface-emitting DFB QCLs with second-order gratings demonstrated previously. [9][10][11][12][13][14] The second-order gratings implemented for standard QCLs 9-13 matched the wave vector of a given laser mode, whereas in our devices the grating should match the wave vector of the nonlinear polarization at difference frequency; see below. Furthermore, for devices reported in Refs.…”