Calculation of beam divergence of a quantum cascade laser by effective index method

Szymański, Michał; Regiński, K.; Mroziewicz, B.; Pruszyńska-Karbownik, Emilia; Kosiel, Kamil; Karbownik, Piotr

doi:10.1117/12.2012000

Cited by 2 publications

(2 citation statements)

References 14 publications

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“…In the QCLs such a condition is fulfilled in the slow axis. In this case the field E m ðxÞ of mth transversal mode on the resonator mirror can be expressed by Szymański et al (2013)…”

Section: Methodsmentioning

confidence: 99%

A novel method to calculate a near field of widely divergent laser beams

2016

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A new method to calculate the near field of widely divergent laser beams based on a given far field is proposed. It is assumed that the field of radiation consists of several transversal modes and the far field is determined by the Huygens principle. The idea consists in employing the least squares method to find a minimum of the difference between the measured far field and the far field calculated under the assumption that is consists of several transversal modes with assumed weights. To find this minimum the Levenberg-Marquardt algorithm is used. Thus the problem is dealt beyond the paraxial approximation. The method is illustrated by its results for experimental mid-infrared quantum cascade laser beams and for the beams obtained by simulations. Keywords Near field Á Far field Á Quantum cascade laser Á Non-Gaussian beam This article is part of the Topical Collection on Advances in the Science of Light.

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“…In the QCLs such a condition is fulfilled in the slow axis. In this case the field E m ðxÞ of mth transversal mode on the resonator mirror can be expressed by Szymański et al (2013)…”

Section: Methodsmentioning

confidence: 99%

A novel method to calculate a near field of widely divergent laser beams

2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…In addition to the lasers themselves, another problem associated with on-board systems is beam management. This function is far from trivial, especially considering the thermalization required and the lasers high divergence (60°) 19 . We opted for a planar integration, i.e.…”

Section: Focus On Beam Managementmentioning

confidence: 99%