Highly efficient power extraction in terahertz quantum cascade laser via a grating coupler

Chen, Yu; Zhu, Hao; Wang, Fangfang; Chang, Gaolei; Zhu, Hongtu; Chen, Jianxin; Chen, Pingping; Zhou, Tuo; Lü, Wei; Shen, Chengmin; Jiang, Tao; Wang, Xuemin; Wu, Weidong; Xu, Gangyi; Li, He

doi:10.1063/1.5041977

Cited by 10 publications

(14 citation statements)

References 32 publications

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“…The employed laser source is a THz QCL with a grating coupler to efficiently extract the THz radiation and an active distributed Bragg reflector for single-mode operation. The QCL GaAs/Al 0.15 Ga 0.85 As active region is based on a bound-to-continuum design, with a thickness of ∼12 μm and a metal-metal waveguide [ 31 ]. The pulses were generated by means of pulse generator (AVTECH AVR-3HF-B), controlled via a custom LabVIEW software.…”

Section: Experimental Apparatusmentioning

confidence: 99%

H2S quartz-enhanced photoacoustic spectroscopy sensor employing a liquid-nitrogen-cooled THz quantum cascade laser operating in pulsed mode

et al. 2021

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Section: Experimental Apparatusmentioning

confidence: 99%

H2S quartz-enhanced photoacoustic spectroscopy sensor employing a liquid-nitrogen-cooled THz quantum cascade laser operating in pulsed mode

et al. 2021

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“…For such device, highly efficient power extraction was experimentally obtained using a grating coupler. [244] Recently, Xu's group reported a THz masteroscillator power-amplifier QCL for single-mode operation with a 36 times higher output power than that of a second-order DFB laser from the same material. [245] While lasers and SPSs are highly demanded for current and next-generation applications, LEDs have not lost their appeal as fundamental platform for illumination and light-based technologies.…”

Section: Quantum Structures For Light Generationmentioning

confidence: 99%

Advances in Functional Nanomaterials Science

Rahimi‐Iman

2020

Annalen der Physik

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Technologies employing nanomaterials, such as electronics, optoelectronics, nanobiotechnologies, quantum optics, and nanophotonics, are perceived as the key drivers of investigations on novel and functional materials and their nanostructures for various applications. It is well understood that the study of such materials and structures has been of great importance for the optimization and development of electrical and optical devices. From such devices, one does not only expect higher efficiencies, but also access to the development of completely new concepts, which are strongly demanded by modern information‐processing, quantum, or medical technologies, and sensing applications. In this context, a wide range of aspects such as the physics of novel materials, as well as materials engineering, characterization, and applications are summarized here. Novel materials, which can be used, for instance, for energy harvesting or light generation, as well as for future logic devices; material engineering, which can lead to improved device functionality and performance in optoelectronics; material physics, the study of which allows insight to be gained into optical and electrical properties of nanostructured systems and quantum materials; and technologies/devices, addressing progress on the application side of sophisticated material systems and quantum structures, are highlighted using representative examples.

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“…Terahertz quantum cascade lasers (THz-QCLs) [1,2] have demonstrated important applications in the fields of spectroscopy, trace gas detection, imaging, and so on [3][4][5][6][7][8][9]. Intensive studies have been devoted to improving the performances of single-mode THz-QCLs, including the output power, the wall-plug efficiency and the beam directionality [10][11][12][13][14][15]. Metal-metal waveguide was widely used in THz-QCLs for high operation temperature due to its high optical confinement factor.…”

Section: Introductionmentioning

confidence: 99%

Modeling and improving the output power of terahertz master-oscillator power-amplifier quantum cascade lasers

Zhu¹,

Zhu²,

Chen³

et al. 2020

Opt. Express

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A model based on carrier rate equations is proposed to evaluate the gain saturation and predict the dependence of the output power of a terahertz master-oscillator power-amplifier quantum cascade laser (THz-MOPA-QCL) on the material and structure parameters. The model reveals the design rules of the preamplifier and the power extractor to maximize the output power and the wall-plug efficiency. The correction of the model is verified by its agreement with the experiment results. The optimized MOPA devices exhibit single-mode emission at ∼ 2.6 THz with a side mode suppression ratio of 23 dB, a pulsed output power of 153 mW, a wall-plug efficiency of 0.22%, and a low divergence angle of ∼6°×16°, all measured at an operation temperature of 77 K. The model developed here is helpful for the design of MOPA devices and semiconductor optical amplifiers, in which the active region is based on intersubband transitions.

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Highly efficient power extraction in terahertz quantum cascade laser via a grating coupler

Cited by 10 publications

References 32 publications

H2S quartz-enhanced photoacoustic spectroscopy sensor employing a liquid-nitrogen-cooled THz quantum cascade laser operating in pulsed mode

H2S quartz-enhanced photoacoustic spectroscopy sensor employing a liquid-nitrogen-cooled THz quantum cascade laser operating in pulsed mode

Advances in Functional Nanomaterials Science

Modeling and improving the output power of terahertz master-oscillator power-amplifier quantum cascade lasers

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