Terahertz quantum-cascade lasers | Nature Photonics- terahertz quantum cascade lasers with sampled lateral gratings for single mode operation ,The multiple-quantum-well active region is usually grown using molecular-beam epitaxy in the GaAs/Al x Ga 1–x As material system, and is the heart of any QC laser. To obtain gain for ...(PDF) Recent Progress in Widely Tunable Single-Mode Room ...Quantum cascade lasers: a versatile source for precise measurements in the mid/far-infrared range By Saverio Bartalini High-Temperature Operation of …
Single-mode THz quantum cascade laser. Distributed feedback (DFB) is a reliable compact approach in THz QCL to realize coherent single-mode emission. ... Single-mode operation can be achieved by choosing a small period Z so that the ±1 order supermodes are shifted from the gain curve. ... F.Y. Zhao, Y.Y. Li, J.Q. Liu, et al.. “Sampled ...
We report the design, fabrication and experimental characterization of surface-emitting terahertz (THz) frequency quantum cascade lasers (QCLs) with distributed feedback concentric-circular-gratings. Single-mode operation is achieved at 3.73 THz with a side-mode suppression ratio as high as ~30 dB. The device emits ~5 times the power of a ridge laser of similar dimensions, …
Jan 08, 2021· In conclusion, we have presented high-speed operation of a single-mode tunable quantum cascade laser at λ ∼ 4.6 µm based on a buried hetero-structure ultra-short resonant cavity. A broad single-mode tuning range covers ∼40 nm at room temperature under low electrical power consumption below 1.1 W. High frequency modulation is achieved with ...
A general method is presented to calculate the coupling coefficients of lateral gratings. In conjunction with this method, the lasers are well described by the coupled-mode theory of DFB lasers with two reflective end facets. Single-mode operation within the specified frequency bands at 4.75 THz is demonstrated.
Jan 25, 2013· We demonstrate single-mode surface-emitting terahertz frequency quantum cascade lasers utilising non-uniform second-order distributed feedback concentric-circular-gratings. The grating is designed for single-mode operation and surface emission for efficient and directional optical power out-coupling. The devices exhibit single-mode operation over …
The diameter of the silicon lens we presented here is 3mm with a total length of 1.96mm. When the lens is placed in contact with the output facet of 150-μm-wide laser, the simulated divergence angle of far-field pattern is ~8.7°. Special copper heat sinks were designed to …
CW operation was observed up to 35 K, where the threshold current increased to 595 mA, while still more than 120 pW of output Continuous-wave operation of a terahertz quantum cascade laser is power was emitted at 850 mA.
The periodic scattering of the surface plasmon modes employed in the waveguide of terahertz quantum cascade lasers is shown to be an efficient method to control the properties of the laser emission. The scatterers are realized as thin slits in the metal and top contact layer carrying the surface plasmon. This technique provides larger coupling strengths than previously reported …
Single mode operation with at least 30 dB SMSR could be maintained from threshold to at least 110 mA in a temperature range from 10 °C to 35 °C. At 20 °C the threshold current and power were 70 mA and 203 mW, respectively, which is considerably lower than for the best reported QCLs in this wavelength region [14].
Jan 01, 2013· Unique distributed-feedback (DFB) techniques have been recently demonstrated to achieve single-mode operation of THz QCLs with narrow beam patterns. 20, 21, 22, 23, 24 Techniques for continuous frequency tuneability in the range of …
Feb 01, 2014· Abstract. Currently, different competing waveguide and resonator concepts exist for terahertz quantum-cascade lasers (THz QCLs). We examine the continuous-wave (cw) performance of THz QCLs with single-plasmon (SP) and metal-metal (MM) waveguides fabricated from the same wafer. While SP QCLs are superior in terms of output power, the …
We implemented our scheme for terahertz plasmonic quantum-cascade lasers (QCLs) and measured peak output power in excess of 2W for a single-mode 3.3THz QCL radiating in a narrow single-lobed beam, when operated at 58K in a compact Stirling cooler. ... 50% radiative efficiency and is significantly greater than that achieved for previous single ...
May 04, 2017· The dynamical tuning due to rear facet illumination of single-mode, terahertz (THz) quantum-cascade lasers (QCLs) which employ distributed feedback gratings are compared to the tuning of single-mode QCLs based on two-section cavities. The THz QCLs under investigation emit in the range of 3 to 4.7 THz. The tuning is achieved by illuminating the …
The diameter of the silicon lens we presented here is 3mm with a total length of 1.96mm. When the lens is placed in contact with the output facet of 150-μm-wide laser, the simulated divergence angle of far-field pattern is ~8.7°. Special copper heat sinks were designed to …
Lukasz Sterczewski, Jonas Westberg, Yang Yang, David Burghoff, John Reno, Qing Hu, Gerard Wysocki, “Terahertz Multiheterodyne Spectroscopy With Quantum Cascade Lasers – A Feasibility Study,” 2017 42nd International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz 2017), Cancun, Mexico, August 27 – September 1 (2017).
Jun 01, 2017· Multi-Watt high-power terahertz (THz) frequency quantum cascade lasers are demonstrated, based on a single, epitaxially grown, 24-μm-thick active region embedded into a surface-plasmon waveguide. The devices emit in pulsed mode at a frequency of ∼4.4 THz and have a maximum operating temperature of 132 K.
Since epitaxial regrowth is challenging in the GaSb material system, all single mode ICL devices reported up to now use gratings that are added after the epitaxy of a full laser layer. So far, two different overgrowth-free DFB concepts for single mode operation of ICLs have been presented – corrugated sidewalls and Ge top gratings [7, 8].
Apr 11, 2018· Proper design of the gratings can enhance the efficiency of distributed-feedback and quantum cascade lasers. Here, Jin et al. use a hybrid grating system that superposes second- and fourth-order ...
Asaf Albo, Yuri V. Flores, Qing Hu, and John L. Reno, “Two-well terahertz quantum cascade lasers with suppressed carrier leakage,” Appl. Phys. Lett. 111, 111107 (2017). [ PDF] Yang Yang, David Burghoff, John Reno, and Qing Hu, “Achieving comb formation over the entire lasing range of quantum cascade lasers,” Op. Lett. 42, 3888 (2017). [ PDF]
The method allows the realization of single-mode THz lasers with as little as 50 grating periods and is used here to demonstrate DFB laser operation in devices without cleaved facets and vertical emission from second-order DFB lasers. 2. Modeling The design of the active region and the waveguide of our devices are the same as in Ref. [ 12 ].
We report the design, fabrication and experimental characterization of surface-emitting terahertz (THz) frequency quantum cascade lasers (QCLs) with distributed feedback concentric-circular-gratings. Single-mode operation is achieved at 3.73 THz with a side-mode suppression ratio as high as ~30 dB.
May 04, 2017· The dynamical tuning due to rear facet illumination of single-mode, terahertz (THz) quantum-cascade lasers (QCLs) which employ distributed feedback gratings are compared to the tuning of single-mode QCLs based on two-section cavities. The THz QCLs under investigation emit in the range of 3 to 4.7 THz. The tuning is achieved by illuminating the …
Oct 24, 2020· Terahertz (THz) quantum cascade lasers (QCLs) are electrically pumped and heterostructure based semiconductor laser sources with intersubband transitions of electrons in different layers of the quantum wells and barriers. The THz QCLs have high output power in THz region which make them important from application point of view. Recently intensive research …
Feb 01, 2014· Abstract. Currently, different competing waveguide and resonator concepts exist for terahertz quantum-cascade lasers (THz QCLs). We examine the continuous-wave (cw) performance of THz QCLs with single-plasmon (SP) and metal-metal (MM) waveguides fabricated from the same wafer. While SP QCLs are superior in terms of output power, the …
