state-of-the-art top-of-line quantum cascade lasers
Transient Osteoporosis of the Hip: State of the Art and Review of Literature
... single line sign with edema with on T1 images, double line sign (an outer band of low signal associated with an inner band of high signal) with edema on T2 images and may reveal femoral head ...
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Endophthalmitis: state of the art
... In the Endophthalmitis Vitrectomy Study (EVS), 24 94% of patients with acute-onset postoperative endophthalmitis following cataract surgery or secondary intraocular lens [r] ...
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Coherent imaging using laser feedback interferometry with pulsed-mode terahertz quantum cascade lasers
... current state of the art solution for a fast high-resolution THz imaging system is to utilise a THz QCL as an illumination source and a microbolometer-based THz camera as a ...
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Design Optimization for 4.1-THZ Quantum Cascade Lasers
... terahertz-quantum cascade lasers (THz-QCLs) is to achieve population inversion in a THz inter-subband structure, at room ...ground state into the lower laser state reduces the ...
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Planar integrated metasurfaces for highly-collimated terahertz quantum cascade lasers
... Design of the metasurface collimator. Figure 3(a) shows a 2D simulation of the electric field distribution of the whole device performed in the y-z plane along the symmetric line of the structure (white dashed ...
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Temperature dependent high speed dynamics of terahertz quantum cascade lasers
... delay and rise time are seen to increase non-linearly with increasing temperature, while the steady-state optical output power decreases and ceases altogether at ∼53 K. Because thermal effects take place on a ...
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Infinite-period density-matrix model for terahertz-frequency quantum cascade lasers
... In Fig. 7, we included the dependence of the waveguide loss on the temperature discussed in [37], which slightly decreases, and that is one of the reasons why threshold currents do not fully match the experiment. We also ...
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Discrete Vernier tuning in terahertz quantum cascade lasers using coupled cavities
... A schematic diagram of the experimental setup is shown in Fig. 5(b). The tuning section of the laser was heated using a train of 10-µs-long current pulses at a repetition rate of 8.21 kHz, which were supplied using an ...
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Development of Terahertz Frequency Quantum Cascade Lasers for the Applications as Local Oscillators
... 2]. Quantum-cascade lasers [3] (QCLs), in particular, are promising light sources in the terahertz (THz) spectral region ...structure line at ...
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Aspects of the internal physics of InGaAs/InAlAs quantum cascade lasers
... the quantum cascade structure is described within a tight-binding-like picture, where any state in the long cascade is associated with one of its ...a cascade to be constructed as ...
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Efficient method for transport simulations in quantum cascade lasers
... paper we propose an approach based on other methods to determine Green’s functions. We were inspired by Büttiker probes (see Fig. 4), widely used in mesoscopic physics, where the parameter % b i $ b $ b [27] describing ...
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Optimizing optical nonlinearities in GaInAs/AlInAs quantum cascade lasers
... ground state which is lo cated one LO phonon en ergy be low the lower la ser level (6), so as to fa cil i tate faster car rier ex trac tion from the ac - tive QCL re gion into the fol low ing col lec tor/in jec ...
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High order sideband generation in terahertz quantum cascade lasers
... Photoluminescence (PL) measurements (Figure 4(b)) were performed and compared with the simulated electron- heavy hole overlap (Figure 4(c)) and the sideband intensity (Figure 4(a)) to identify the origin of the ...
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Fast modulation of terahertz quantum cascade lasers using graphene loaded plasmonic antennas
... supported by the metal feature and m is an odd integer number. A more detailed simulation, however, is required to better investigate and disentangle the optical response of the graphene loaded plasmonic antennas and the ...
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Coupled-cavity terahertz quantum cascade lasers for single mode operation
... the top laser metallization that inevitably introduce significant additional losses (the increase in waveguide losses can be up to ...green line) for gap widths larger than 20 lm (the cavity lengths are ...
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Towards automated design of quantum cascade lasers
... the active region are set by the desired emission wavelength sbetween the active laser levelsd and the longitudinal optical sLOd phonon energy sbetween the ground and lower laser leveld, which facilitates the population ...
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Investigation and Application of Microscale Semiconductor Lasers and Cavities
... This dissertation is a culmination of work tied together by an overreaching goal: understanding the behavior of microscale active optical cavities and leveraging that knowledge to design and create such devices for ...
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Investigation of thermal effects in quantum-cascade lasers
... where and are the indexes to the control volumes (of size by ) in the and direction, respectively, and is an integer counter of the time step . The midpoint values of the thermal conductivity were calculated as the ...
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Accuracy Improvement of Blood Glucose Measurement System Using Quantum Cascade Lasers
... DOI: 10.4236/opj.2019.910014 157 Optics and Photonics Journal As described above, numerous groups have developed blood glucose mea- surement systems based on QCLs; however, most of these systems use wave- length-tunable ...
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Distributed feedback terahertz frequency quantum cascade lasers with dual periodicity gratings
... ble which correspond to the fundamental frequencies of the two superimposed gratings. The intensity of the mixed har- monic peaks due to the clipping effect is here largely reduced compared with that seen previously ...
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