Гетероструктуры квантово-каскадных лазеров спектрального диапазона 7-8 mum

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The heterostructure of a quantum-cascade laser based on In0.53Ga0.47As/Al0.48In0.52As heteropair lattice matched with the InP was grown by molecular beam epitaxy. InP layers was used to form the optical waveguide. Room temperature lasing in the spectral range of 8 μm in the standard ridge geometry of a Fabry-Perot cavity formed by cleaved facets with peak output optical power of 0.45 W was obtained.

Section: поступило в редакцию 4 апреля 2019 г в окончательной редакцunclassified

Мощные квантово-каскадные лазеры с длиной волны генерации 8 μm

Бабичев¹,

Дюделев²,

Гладышев³

et al. 2019

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“…В исследованиях использовались ККЛ с длиной волны генерации 8 µm. Образцы были изготовлены из гетероструктуры, аналогичной описанной ранее [9]. Ширина полосков исследуемых ККЛ составляла 22 и 50 µm.…”

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Исследование пространственных характеристик излучения квантовых каскадных лазеров для спектрального диапазона 8 μm

Дюделев¹,

Михайлов²,

Мыльников³

et al. 2020

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The near and far fields of quantum cascade lasers emitting in the spectral range near 8 µm have been studied. Lasing in the fundamental waveguide mode along the "fast" axis with a divergence of ~ 50º was observed in all samples of lasers with stripe widths of 22 and 50 µm in the entire range of pump currents. On the "slow" axis, multimode lasing and competition between the fundamental and higher waveguide modes were observed, which manifests itself for lasers with a 50 µm stripe in an increase of the radiation divergence from ~ 10º near the threshold to > 50º with a two-fold excess of the lasing threshold. The divergence along the slow axis for lasers with a stripe width of 22 µm remained unchanged over the entire range of pump currents and amounted to ~ 50º. The significant contribution of the fundamental mode to the total radiation intensity of quantum cascade lasers, being obvious from the far-field intensity distribution, cannot be established solely from the results of measurements of the near-field.

“…Активная область включала 50 каскадов на основе гетеропары In 0.53 Ga 0.47 As/In 0.52 Al 0.48 As. Использована конструкция с двухфононным резонансным рассеянием носителей заряда[12,13]. Толщина верхней обкладки волновода (слоя InP) составила 4 µm (n = 1 • 10 17 cm −3 ).…”

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Одночастотная Генерация Арочных Квантово-Каскадных Лазеров При Комнатной Температуре

Бабичев¹,

Гладышев²,

Курочкин³

et al. 2019

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Single-mode lasing at room temperature in quantum-cascade lasers (QCLs) with arched cavity design has been demonstrated. The output optical power in single-mode lasing regime at ~7.7-μm lasing wavelength was above 6 mW with a side-mode suppression ratio of up to 25 dB. The QCL heterostructure for the arched cavities was grown by molecular-beam epitaxy (MBE) based on a heterojunction of In_0.53Ga_0.47As/Al_0.48In_0.52As solid alloys, lattice-matched with InP substrate, and InP layers performing the function of waveguide claddings.