Closed-cavity solutions with partially coherent fields in the space-frequency domain

Bhowmik, Anup

doi:10.1364/ao.22.003338

Cited by 21 publications

(9 citation statements)

References 14 publications

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“…Therefore, the filled factor predicted by the proposed model is in good agreement with the experimental result. In some previous works [19,20], the partially coherent field is computed by averaging on the round-trip coherent fields starting from a noise distribution. This method leads to a quasisteady solution and demands many rounds of computation for the averaging.…”

Section: Calculation and Discussionmentioning

confidence: 99%

“…A stable cavity of COIL is often with large Fresnel number (>500) and many transverse modes oscillating simultaneously. Bhowmik noticed the partially coherent nature of the fields, and developed an improved Fox-Li type iteration by starting with a random noise distribution [20]. The random noise distribution was supposed to represent the partially coherence field which could fill the cavity width during whole propagation inside the cavity.…”

Section: Introductionmentioning

confidence: 99%

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Coupled simulation of chemical lasers based on intracavity partially coherent light model and 3D CFD model

Wu¹,

Huai²,

Jia³

et al. 2011

Opt. Express

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Abstract:Coupled simulation based on intracavity partially coherent light model and 3D CFD model is firstly achieved in this paper. The dynamic equation of partially coherent intracavity field is derived based on partially coherent light theory. A numerical scheme for the coupled simulation as well as a method for computing the intracavity partially coherent field is given. The presented model explains the formation of the sugar scooping phenomenon, and enables studies on the dependence of the spatial mode spectrum on physical parameters of laser cavity and gain medium. Computational results show that as the flow rate of iodine increases, higher order mode components dominate in the partially coherent field. Results obtained by the proposed model are in good agreement with experimental results.

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Section: Calculation and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Coupled simulation of chemical lasers based on intracavity partially coherent light model and 3D CFD model

Wu¹,

Huai²,

Jia³

et al. 2011

Opt. Express

View full text Add to dashboard Cite

show abstract

“…The numerical method in this simulation is summarized as follows. First, we adopt a partially coherent random field [20] as the initial field in the space-frequency domain to avoid dependence between the initial field selection and conversion field in the resonator. The propagation of the field in the cavity can be described by Fresnel-Kirchhoff integral [21].…”

Section: Simulation Model and Numerical Methodsmentioning

confidence: 99%

Numerical investigation on the generation of high-order Laguerre–Gaussian beams in end-pumped solid-state lasers by introducing loss control

Lei

Chen

et al. 2014

Appl. Opt.

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This paper reports a robust and systematic approach to generate high-order scalar Laguerre-Gaussian (LG_p,l) beams in end-pumped solid-state lasers by introducing loss control. Based on the spatial distributions of Laguerre-Gaussian modes and the theory of transverse mode selection, the "loss control" is implemented by an amplitude mask in the resonator. This proposed mechanism can be divided into three categories: radial loss, azimuthal loss, and the combination of radial and azimuthal loss, which correspond to excite radial high-order modes (LG_p,0), azimuthal high-order modes (LG_0,l), and regular high-order modes (LG_p,l), respectively. By controlling the locations and thicknesses of opaque rings and lines on the mask, all kinds of LG_p,l modes can be obtained. With the application of mode purity, all the generated modes possess high mode purities greater than 93% in simulation.

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“…However, the effect of overlap ratio was not explored in detail; it needs more study. In our simulation, the initial simulated field is a partially coherent random field [10] in the space-frequency domain to avoid dependence between the initial field selection and conversion field in the stable laser cavity. Its expression is E ¼ E 0 expði Á rand Á 2pÞ, where E is the optical field, E 0 is the complex amplitude, and rand refers to the random number between 0 and 1.…”

Section: Simulation Of the ''Loss Control'' Methods In A Halfsymmetricmentioning

confidence: 99%

A method for selective excitation of Ince-Gaussian modes in an end-pumped solid-state laser

Lei

Wang

et al. 2014

Appl. Phys. B

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A method for selective excitation of InceGaussian modes is presented. The method is based on the spatial distributions of Ince-Gaussian modes as well as the transverse mode selection theory. Significant diffraction loss is introduced in a resonator by using opaque lines at zerointensity positions, and this loss allows to excite a specific mode; we call this method ''loss control.'' We study the method by means of numerical simulation of a half-symmetric laser resonator. The simulated field is represented by angular spectrum of the plane waves representation, and its changes are calculated by the two-dimensional fast Fourier transform algorithm when it passes through the optical elements and propagates back and forth in the resonator. The output lasing modes of our method have an overlap of over 90 % with the target Ince-Gaussian modes. The method will be beneficial to the further study of properties and potential applications of Ince-Gaussian modes.

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Closed-cavity solutions with partially coherent fields in the space-frequency domain

Cited by 21 publications

References 14 publications

Coupled simulation of chemical lasers based on intracavity partially coherent light model and 3D CFD model

Coupled simulation of chemical lasers based on intracavity partially coherent light model and 3D CFD model

Numerical investigation on the generation of high-order Laguerre–Gaussian beams in end-pumped solid-state lasers by introducing loss control

A method for selective excitation of Ince-Gaussian modes in an end-pumped solid-state laser

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