single-mode quantum cascade lasers
Coupled-cavity terahertz quantum cascade lasers for single mode operation
... sented in Fig. 5, the maximum emitted power at a heat sink temperature of 13 K is in excess of 3.5 mW. The latter was measured with a calibrated THz power meter and was not corrected for the polyethylene window ...
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Continuous-wave highly-efficient low-divergence terahertz wire lasers
... (THz) quantum cascade lasers (QCLs) have undergone rapid development since their demonstration, showing high power, broad-tunability, quantum-limited linewidth, and ultra-broadband ...the ...
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The MBE growth and optimization of high performance terahertz frequency quantum cascade lasers
... pulsed mode, with a repetition rate of 10 kHz and a duty cycle of 2%, in a liquid-helium continuous-flow cryostat equipped with ...a single facet and the average power was measured using an absolute ...
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Single mode interband cascade lasers emitting below 2 8 μm
... semiconductor lasers by three different approaches with reasonable performance 6 : diode lasers based on GaSb using type-I interband-transitions with emission from around 2 to ...7–11 quantum ...
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Distributed feedback terahertz frequency quantum cascade lasers with dual periodicity gratings
... Figures 4(a)–4(c) show the far-field emission pattern (Figs. 4(a) and 4(b)) and the measured laser spectra (Fig. 4(c)) of two prototype QCL devices (samples D and E) exploiting a top grating designed via Eq. (3). The ...
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Low Power Consumption Substrate Emitting DFB Quantum Cascade Lasers
... facets [8], in which the dissipated power as low as 1.2 W at 22 °C and 0.83 W at 25 °C have been demonstrated by A. C. Richard et al. and Y. Bai et al., respectively. These methods could also be applied to DFB devices. ...
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Coherent imaging using laser feedback interferometry with pulsed-mode terahertz quantum cascade lasers
... With the current system, there are two limiting factors to achieving video frame rate imaging. The first limiting factor is the speed of controlling the two-axis translation stage used in our system — to communicate and ...
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Stable Single Mode Operation of Distributed Feedback Quantum Cascade Laser by Optimized Reflectivity Facet Coatings
... Mid-infrared quantum cascade lasers (QCLs) [1] are one of the most promising light sources for many commercial ap- ...improved single-mode reliability, and low ...stable ...
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QUANTUM cascade lasers (QCLs) are currently the
... temperature single-mode CW devices is at least 10 times longer, because high-performance CW DFB QCLs have effi- cient thermal packaging that prevents excessive heating and the pump current must be modulated ...
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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 microsecond ...
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Planar integrated metasurfaces for highly-collimated terahertz quantum cascade lasers
... 2D far-field emission patterns of the devices were measured by scanning a pyroelectric detector on a spherical surface centered on the curved laser facet. 3D simulations were also performed using Lumerical FDTD. Figure ...
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Development of Terahertz Frequency Quantum Cascade Lasers for the Applications as Local Oscillators
... CW mode up to a temperature of 94 K, with a low temperature output power of ...W. Single frequency emission and better thermal management will be considered in the next device ...
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Discrete Vernier tuning in terahertz quantum cascade lasers using coupled cavities
... Terahertz-frequency quantum cascade lasers (THz QCLs) are compact solid-state sources of coherent radiation in the 1–5 THz region of the electromagnetic spectrum [1], with output powers in excess of ...
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Low divergence single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers
... optical mode selection, only optical collimation and beam ...enable single-mode operation and collimate the edge- emitting beam tightly (~10°) ...Indeed, single-mode devices with a ...
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Single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers
... demonstrated single-mode sur- face emitting THz QCLs using second-order CCGs, which can be simply fabricated by metal evaporation on top of the laser active ...
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Fast modulation of terahertz quantum cascade lasers using graphene loaded plasmonic antennas
... continuum quantum cascade laser was used for all these ...in single mode around the maximum current density, which is a fundamental feature required in order to test the speed performance of ...
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Terahertz imaging using quantum cascade lasers — a review of systems and applications
... pulsed mode [32], and 129 K in cw operation [33], which is preferred for coherent detection ...pulsed mode [34], whereas under cw operation output powers greater than 100 mW have been achieved ...
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Silver-based surface plasmon waveguide for terahertz quantum cascade lasers
... Section 3. Four wafers labeled A1, A2, B1 and B2 are compared in Table 2. A1 and A2 are based on a three-well resonant-phonon active region design [14], with a larger oscillator strength in the case of A2. B1 and B2 are ...
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Optical feedback effects on terahertz quantum cascade lasers: modelling and applications
... frequency quantum cascade lasers,” ...longitudinal mode properties and optical noise in index-guided semiconductor lasers,” IEEE ...
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Surface plasmon waveguides with gradually doped or NiAl intermetallic compound buried contact for terahertz quantum cascade lasers
... Indjin, D., Ikonic, Z., Harrison, P. et al. (1 more author) (2003) Surface plasmon waveguides with gradually doped or NiAl intermetallic compound buried contact for terahertz quantum cascade lasers. ...
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