Highly temperature insensitive quantum cascade lasers

Abstract

Articles you may be interested inHigh power operation of λ5.2-11μm strain balanced quantum cascade lasers based on the same material composition Appl. Phys. Lett. 105, 071106 (2014); 10.1063/1.4893746 Watt level performance of quantum cascade lasers in room temperature continuous wave operation at λ 3.76 μ m Appl. Phys. Lett. 97, 131117 (2010); 10.1063/1.3496489 3 W continuous-wave room temperature single-facet emission from quantum cascade lasers based on nonresonant extraction design approach Appl. Phys. Lett. 95, 141113 (2009); 10.1063/1.3238263Above room-temperature operation of In As ∕ Al Ga Sb superlattice quantum cascade lasers emitting at 12 μ m Appl.An InP based quantum cascade laser ͑QCL͒ heterostructure emitting around 5 m is grown with gas-source molecular beam epitaxy. The QCL core design takes a shallow-well approach to maximize the characteristic temperatures, T 0 and T 1 , for operations above room temperature. A T 0 value of 383 K and a T 1 value of 645 K are obtained within a temperature range of 298-373 K. In room temperature continuous wave operation, this design gives a single facet output power of 3 W and a wall plug efficiency of 16% from a device with a cavity length of 5 mm and a ridge width of 8 m.

Recent Advances in Room Temperature, High-Power Terahertz Quantum Cascade Laser Sources Based on Difference-Frequency Generation

“…Given the waveguide loss of 8 cm´1, mirror loss 2.3 cm´1 for a 3-mm long HR-coated cavity, and confinement factor of 0.4, the electron densities in the upper lasing level, the lower lasing level 2, and its adjacent levels contributing to DFG are calculated as 2.0ˆ10 15 , 2.1ˆ10 14 , 1.1ˆ10 14 , and 4ˆ10 14 cm´3, respectively. The nonlinear susceptibility is estimated to be |χ (2) design have demonstrated the highest power and efficiency in the shorter mid-IR wavelength range (4-6 µ m) [20]. The strong coupling of the lower lasing state and the upper injector state indicates that the SPR design in the long mid-IR wavelength range can be designed with giant nonlinearity without much compromise on its high power feature [21].…”

“…Meanwhile, the mid-IR QCL technology has made tremendous progress in power and efficiency, thanks to the improved material quality, waveguide, and especially the elaborate quantum designs [16][17][18][19]. Out of these, QCLs based on the single-phonon-resonance (SPR) design have demonstrated the highest power and efficiency in the shorter mid-IR wavelength range (4-6 µm) [20]. The strong coupling of the lower lasing state and the upper injector state indicates that the SPR design in the long mid-IR wavelength range can be designed with giant nonlinearity without much compromise on its high power feature [21].…”

Demonstration of a quick process to achieve buried heterostructure quantum cascade laser leading to high power and wall plug efficiency

“…The structure of the laser is as described in Ref. 25. These were processed so as to analyze the advantage of BH design in terms of thermal dissipation.…”

Comment on “Highly temperature insensitive quantum cascade lasers” [Appl. Phys. Lett. 97, 251104 (2010)]

“…Equation ͑2͒ makes clear that the inelastic-scattering rate is an exponential function of −E ul+1,ul ; thus, in order to virtually suppress electron leakage one has to significantly increase the E ul+1,ul value. That, in turn, can be realized by tapering the barrier heights in the active region such that their conduction band edges increase in energy from the injection barrier to the exit barrier, as was shown for 4.6− 4.8 m emitting, deep-well QCLs of tapered active-region design [5][6][7] and double-phonon-resonance depopulation scheme, and as obtained by Bai et al 1 for ϳ5.0 m emitting QCLs of "shallow-well" design and SPR depopulation scheme.…”