Scaling the output power of quantum-cascade lasers with a number of cascades

Fedosenko, Oliana; Chashnikova, M.; Machulik, S.; Kischkat, Jan; Klinkmüller, M.; Aleksandrova, A.; Monastyrskyi, G.; Semtsiv, M. P.; Masselink, W. T.

doi:10.1016/j.jcrysgro.2010.11.131

Cited by 15 publications

(5 citation statements)

References 6 publications

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“…We see that, as expected, the threshold voltage is proportional to the number of cascades and the threshold current density is higher for fewer cascades. This trend was observed before for the series of lasers with different numbers of cascades . Whereas Gmachl fits

J_{t h} \propto {erf}^{- 1} true(N / N_{0} true)

, the trend is easier to describe (and with no loss of accuracy for

5 {< N}_{C} < 30

) with a power law over the range of N that we have investigated.…”

Section: Pulsed Laser Performancesupporting

confidence: 78%

Impact of Cascade Number on the Thermal Properties of Broad‐Area Quantum Cascade Lasers

Aleksandrova

Flores

Kurlov

et al. 2017

Physica Status Solidi (a)

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In this article the operation and thermal conductance of a series of quantum cascade lasers (QCLs) emitting at 4.6 μm grown with between 5 and 30 cascades in the active region is analyzed. A reduced number of cascades, but with fixed active region design, results in larger threshold current density but lower threshold power density. An analysis of the temperature gradient in the active region implies that for continuous-wave QCL operation, using fewer than 15 cascades in the active region is advantageous, especially for broad-area structures. We demonstrate a QCL with 10 cascades operating in continuouswave mode at room temperature emitting 0.9 W from a 4 mm Â 30 μm stripe.

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J_{t h} \propto {erf}^{- 1} true(N / N_{0} true)

, the trend is easier to describe (and with no loss of accuracy for

5 {< N}_{C} < 30

) with a power law over the range of N that we have investigated.…”

Section: Pulsed Laser Performancesupporting

confidence: 78%

Impact of Cascade Number on the Thermal Properties of Broad‐Area Quantum Cascade Lasers

Aleksandrova

Flores

Kurlov

et al. 2017

Physica Status Solidi (a)

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“…Increasing the number of cascades can technically archive total quantum efficiencies greater than 100% because each cascade can result in up to one photon per electron [39] and the electron can be reused by the next cascade. The power efficiency is largely independent on the number of cascades, but increases with the cascade number due to better overlap of the optical mode with the gain.…”

Section: Quantum Cascade Lasersmentioning

confidence: 99%

“…Therefore, they can be periodically stacked. Several pairs of quantum wells and barriers on top of each other form a cascading structure enhancing the quantum efficiency of the process [39] and giving the lasers their name (QCL).…”

Section: Quantum Cascade Lasersmentioning

confidence: 99%

Mid-IR hyperspectral imaging for label-free histopathology and cytology

Hermes

Morrish

Huot³

et al. 2018

J. Opt.

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Mid-infrared (MIR) imaging has emerged as a valuable tool to investigate biological samples, such as tissue histological sections and cell cultures, by providing non-destructive chemical specificity without recourse to labels. While feasibility studies have shown the capabilities of MIR imaging approaches to address key biological and clinical questions, these techniques are still far from being deployable by non-expert users. In this review, we discuss the current state of the art of MIR technologies and give an overview on technical innovations and developments with the potential to make MIR imaging systems more readily available to a larger community. The most promising developments over the last few years are discussed here. They include improvements in MIR light sources with the availability of quantum cascade lasers and supercontinuum IR sources as well as the recently developed upconversion scheme to improve the detection of MIR radiation. These technical advances can substantially speed up data acquisition of multispectral or hyperspectral datasets thus providing the end user with vast amounts of data when imaging whole tissue areas of many mm2. Therefore, effective data analysis is of tremendous importance, and progress in method development is discussed with respect to the specific biomedical context.

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“…Дополнительное повышение квантовой эффективности возможно за счет реализации многопериод-ных гетероструктур ККЛ, содержащих до 100 каскадов [10]. Изготовле-ние таких многопериодных гетероструктур ККЛ требует поддержания высокой идентичности химического состава и толщин слоев, форми-рующих каскады, на протяжении всего длительного эпитаксиального процесса [11]. Использование промышленных установок МПЭ удовле-творяет этим требованиям [12,13] и существенно повышает качество роста.…”

Section: поступило в редакцию 17 марта 2017 гunclassified

Гетероструктуры квантово-каскадных лазеров спектрального диапазона 7-8 mum

Бабичев¹,

Гладышев²,

Филимонов³

et al. 2017

Письма В Журнал Технической Физики

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Методом молекулярно-пучковой эпитаксии продемонстрирована возможность изготовления гетероструктур квантово-каскадных лазеров спектрального диапазона 7-8 mum, содержащих в активной области 50 квантовых каскадов на основе гетеропары твердых растворов In0.53Ga0.47As/Al0.48In0.52As. Для получения оптического излучения использована конструкция квантового каскада, основанная на принципе двухфононного резонансного рассеяния. Методами рентгеновской дифракции и просвечивающей электронной микроскопии исследованы структурные свойства созданных гетероструктур и подтверждено их высокое структурное совершенство --- идентичность состава и толщин эпитаксиальных слоев во всех 50 каскадах. Полосковые лазеры, изготовленные из гетероструктуры, демонстрируют лазерную генерацию с пороговой плотностью тока менее 1.6 kA/cm2 при температуре 78 K. DOI: 10.21883/PJTF.2017.14.44833.16776

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Scaling the output power of quantum-cascade lasers with a number of cascades

Cited by 15 publications

References 6 publications

Impact of Cascade Number on the Thermal Properties of Broad‐Area Quantum Cascade Lasers

Impact of Cascade Number on the Thermal Properties of Broad‐Area Quantum Cascade Lasers

Mid-IR hyperspectral imaging for label-free histopathology and cytology

Гетероструктуры квантово-каскадных лазеров спектрального диапазона 7-8 mum

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