A ray-optic, Monte Carlo, description of a Gaussian beam waist - applied to reverse saturable absorption

Milsom, P. K.

doi:10.1007/s003400050867

Cited by 14 publications

(8 citation statements)

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“…According to Eqs. (12) and (32) when z → ∞ the intensity distribution I z (x = pz/n) is proportional to the angular distribution at z = 0…”

Section: Double Slitmentioning

confidence: 98%

Complementary Huygens principle for geometrical and nongeometrical optics

Luis¹

2007

Eur. J. Phys.

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We develop a fundamental principle depicting the generalized ray formulation of optics provided by the Wigner function. This principle is formally identical to the Huygens-Fresnel principle but in terms of opposite concepts, rays instead of waves, and incoherent superpositions instead of coherent ones. This ray picture naturally includes diffraction and interference, and provides a geometrical picture of the degree of coherence.

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“…According to Eqs. (12) and (32) when z → ∞ the intensity distribution I z (x = pz/n) is proportional to the angular distribution at z = 0…”

Section: Double Slitmentioning

confidence: 98%

Complementary Huygens principle for geometrical and nongeometrical optics

Luis¹

2007

Eur. J. Phys.

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“…A particularly elegant approach that is able to correctly reproduce the profile of a Gaussian beam at every position was proposed by Milsom 35 for the modeling of reverse saturable absorption. The approach is based on a stochastic ray-optics description which is perfectly compatible with an MC framework and based on the actual physical parameters used to describe the Gaussian beam.…”

Section: Methodsmentioning

confidence: 99%

Experimental imaging and Monte Carlo modeling of ultrafast pulse propagation in thin scattering slabs

Pattelli

Mazzamuto²

2022

J. Biomed. Opt.

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. Significance : Most radiative transport problems in turbid media are typically associated with mm or cm scales, leading to typical time scales in the range of hundreds of ps or more. In certain cases, however, much thinner layers can also be relevant, which can dramatically alter the overall transport properties of a scattering medium. Studying scattering in these thin layers requires ultrafast detection techniques and adaptations to the common Monte Carlo (MC) approach. Aim : We aim to discuss a few relevant aspects for the simulation of light transport in thin scattering membranes, and compare the obtained numerical results with experimental measurements based on an all-optical gating technique. Approach : A thin membrane with controlled scattering properties based on polymer-dispersed nanoparticles is fabricated for experimental validation. Transmittance measurements are compared against a custom open-source MC implementation including specific pulse profiles for tightly focused femtosecond laser pulses. Results : Experimental transmittance data of ultrafast pulses through a thin scattering sample are compared with MC simulations in the spatiotemporal domain to retrieve its scattering properties. The results show good agreement also at short distances and time scales. Conclusions : When simulating light transport in scattering membranes with thicknesses in the orders of tens of micrometer, care has to be taken when describing the temporal, spatial, and divergence profiles of the source term, as well as the possible truncation of step length distributions, which could be introduced by simple strategies for the generation of random exponentially distributed variables.

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“…The reconstruction of the angular information by any spatially resolved experiment is incomplete because of diffraction (overlapping divergent beamlets). The possibility to describe a Gaussian beam as a bundle of partial beams some times has been discussed in the literature 12 . The wave can be decomposed into elementary Gaussian beamlets as well as in partial plane waves.…”

Section: Error Correctionmentioning

confidence: 99%

<title>Automated high-accuracy measuring system for specular microreflectivity</title>

et al. 2001

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An automated, compact system for high-accuracy measurements of specular reflectivity at different laser wavelengths (633 nm, 822 nm) on the basis of lock-in technique and LabView has been developed. With a spatial resolution of < 2 µm, a signal resolution of < 10 -4 was obtained. Micro-optical components like microlenses with angular-compensating antireflection coatings, non-uniform micro-mirror arrays, broad-stripe diode laser facets and low-numerical-aperture gradedindex microlenses have been characterized by two-dimensional reflectivity mapping. Errors caused by the angular spectrum of the focused polarized probe lasers were analysed.

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A ray-optic, Monte Carlo, description of a Gaussian beam waist - applied to reverse saturable absorption

Cited by 14 publications

References 0 publications

Complementary Huygens principle for geometrical and nongeometrical optics

Complementary Huygens principle for geometrical and nongeometrical optics

Experimental imaging and Monte Carlo modeling of ultrafast pulse propagation in thin scattering slabs

<title>Automated high-accuracy measuring system for specular microreflectivity</title>

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