Coupled ridge waveguide distributed feedback quantum cascade laser arrays

Abstract

Articles you may be interested in 5.5 W near-diffraction-limited power from resonant leaky-wave coupled phase-locked arrays of quantum cascade lasers Appl. Phys. Lett. 106, 061113 (2015); 10.1063/1.4908178Index-coupled surface porous grating distributed feedback quantum cascade laser

Low Power Consumption Substrate-Emitting DFB Quantum Cascade Lasers

“…In recent years, quantum cascade lasers (QCLs) have undergone a rapid development and become the most promising source in the mid-infrared frequency region [ 1 – 3 ]. Benefited from their high power, single-mode operation and compact size, distributed-feedback (DFB) QCLs have been widely used in many applications such as trace-gas sensing, free space communication, and substance analysis [ 4 – 6 ].…”

Phase-locked array of quantum cascade lasers with an integrated Talbot cavity

“…Phase-locked array with in-phase operation can provide coherent light with beam divergence smaller than that of a single laser [10]. Recently, this technology have been intensively studied for QCLs, including evanescent-wave coupling arrays [11,12], leaky wave coupling arrays [13,14], Y-coupling arrays [15] and global antenna mutual coupling arrays [16]. However, the evanescent-wave coupling devices often tend to favor out-of-phase operation [11]; leaky-wave coupling devices can operate in in-phase mode but need very complex regrowth process to form anti-waveguides structure [13] or need additional phase sectors [14]; Y-coupling devices often show undesirable self-pulsation dynamics between inphase and out-of-phases operation due to spatial hole burning effect [14]; global antenna mutual coupling scheme is only suitable for surface-emitting laser with a deep subwavelength confined cavity [16].…”

High-power phase-locked quantum cascade laser array emitting at λ ∼ 4.6 μm

“…The single-mode spectrum can be maintained by introducing a distributed feedback grating on the top cladding layer. 16,21 In conclusion, we demonstrate a 40-W phase-locked QCL array consisting of 100 elements that were integrated in parallel emitting at λ ∼ 4.6 µm. A single-lobe far-field pattern with a lateral divergence of 2…”

“…16 Fig . 2 shows the simulation results for waveguide loss and modal gain for a five-element (N) phase-locked array by solving the one-dimensional (1D) Helmholtz's equation using finite element software [COM-SOL].…”

“…15 Very recently, our group has also obtained phase-locked QCL array emitting at 7.25 µm using a shallow etched coupled ridge waveguide. 16 However, the current presented phase-locked QCL arrays with only a few Watts of output power mostly demonstrate operation in the long-wavelength infrared spectral region (7 ∼ 9 µm) because of the strong coupling and a large-tolerance fabrication process. For practical reasons, high-power injection lasers with low beam divergence in the mid-infrared spectral region (3∼5 µm) are also significant.…”