System physics modeling of the electro-optical energy conversion in mid-infrared quantum cascade lasers

Tholl, Hans Dieter; Münzhuber, Franz

doi:10.1117/12.2240877

Cited by 1 publication

(2 citation statements)

References 6 publications

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“…We know that Δn 0 is induced by electron-hole pairs, and can be described by the following equation [12]: (8) Combining Equations 2, 3 and 4, we obtain the following: (9) which yields: (10) where e is the charge of an electron, λ is the wavelength of the laser, N and P are the numbers of the electrons and holes, ε 0 is the permittivity in a vacuum, and and are the effective electron and hole masses, respectively.…”

Section: Numerical Approachmentioning

confidence: 99%

“…Modulation of QCLs is an effective method of suppressing low-frequency noise and improving the signal-to-noise ratio. Various approaches to modulation have been reported, including thermal [ 8 ], electrical [ 9 ], acousto-optic [ 10 ], Faraday rotation effect spectroscopy [ 11 ], and all-optical methods [ 12 ]. The unipolar characteristics of QCLs provide them with unique advantages for all-optical modulation.…”

Section: Introductionmentioning

confidence: 99%

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Numerical study on all-optical modulation characteristics of quantum cascade lasers

Wei¹,

Zhou²,

Li³

et al. 2022

Beilstein J. Nanotechnol.

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To explain the phenomenon of all-optical modulation of quantum cascade laser (QCL), and explore the physics in QCL’s gain medium which consists of multiple of dielectric nanostructures with high refractive index under light injection, we modified the 1½-period model to calculate values of electron population and lifetime in each subband which is separated by the nanostructures, optical gain, current and number of photons in the cavity of a mid-infrared QCL modulated with near-infrared optical injection. The results were consistent with an experiment, where the injected light increases the electron population and lifetime, but does not affect the optical gain obviously. Our study can be helpful for optimizing its use and dielectric nanostructure design.

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