Effect of decoherence of optical field with broad angular spectrum upon propagation through transparent media interfaces

Ryabukho, Vladimir P.; Лычагов, В. В.; Lyakin, D. V.; Смирнов, И. В.

doi:10.1134/s0030400x11050134

Cited by 11 publications

(7 citation statements)

References 9 publications

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“…For frequency-domain FF-OCT operation [91], tunable sources and fs sources that can reveal the spectral interference images in a short time will be helpful.Finally, it should be mentioned that spatial coherence effects in other related fields such as interferometry in general, holography, surface profiling and other applications has been an active field of research during the last two decades [92][93][94][95][96][97]. The group at Saratov University has been studying longitudinal spatial coherence extensively [98][99][100][101] …”

Section: Conclusion and Future Trendsmentioning

confidence: 99%

Spatial and temporal coherence effects in interference microscopy and full‐field optical coherence tomography

Abdulhalim

2012

Annalen der Physik

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Low‐coherence optical microscopy or optical coherence microscopy uses light with short coherence length. The well‐known case is: “white‐light interferometry”, which became recently more known as: “optical coherence tomography”. However, when lenses and microscope objectives are used to create interferometric images, in what is known classically as “interference microscopy” or today as “full‐field optical coherence tomography” the spatial coherence starts to play a critical role. In this article the coherence effects in low‐coherence optical microscopy are reviewed. As this technology is becoming increasingly publicized due to its importance in three‐dimensional imaging, particularly of scattering biological media and optical metrology, the understanding of the fundamental physics behind it is essential. The interplay between longitudinal spatial coherence and temporal coherence and the effects associated with them are discussed in detail particularly when high numerical apertures are used. An important conclusion of this study is that a high‐contrast, high‐resolution system for imaging of multilayered samples is the one that uses narrowband illumination and high‐NA objectives with an index‐matching fluid. Such a system, when combined with frequency‐domain operation, can reveal nearly real‐time three‐dimensional images, and is thus competitive with confocal microscopy.

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Section: Conclusion and Future Trendsmentioning

confidence: 99%

Spatial and temporal coherence effects in interference microscopy and full‐field optical coherence tomography

Abdulhalim

2012

Annalen der Physik

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“…Our theoretical and experimental investigations have demonstrated 22 that at some conditions the interference signal obtained when the one of interfering quasi-monochromatic fields with broad angular spectrum passes through the layer object can be affected similarly to the dispersion effect in the lowcoherence interferometry 23 . This effect is caused by the spherical aberration arising in the field with broad angular spectrum after propagation of this field through the layer object.…”

Section: Longitudinal Coherence At Passing Through the Layer Objectmentioning

confidence: 91%

“…Substitute (22) in Eqs.17,18 one can simulate the signals of an interference microscope with lighting interferometer as a light source.…”

Section: Longitudinal Spatial Coherence In Interference Microscopymentioning

confidence: 99%

Longitudinal spatial coherence of the optical field and its effects in the interference microscopy

Lyakin¹,

Лычагов²,

Smirnov³

et al. 2013

AIP Conference Proceedings

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The results of theoretical and experimental investigation of longitudinal spatial coherence of an optical field with broad enough angular and frequency spectra and effects of its manifestation in the interference microscopy are presented and discussed. The method for compensation of so-called defocusing effect in interference microscopy which can be applied to simultaneous determination of geometrical thickness and refractive index of a tested layer object has been proposed.

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“…Таким образом, можно сказать, что представления о мгновенных спекл-структурах волнового поля и о зависимостях их параметров от частотного и углового спектров поля не только позволяют в физически наглядной образной форме проводить качественный анализ, но и дают возможность осуществлять количественные оценки пространственных когерентных свойств волнового поля, не прибегая к феноменологическому анализу проявления когерентности света в интерференционном эксперименте. Данная возможность интересна и с прикладной точки зрения, например для более точной количественной оценки процессов декорреляции волновых полей с широкими частотными и угловыми спектрами при их прохождении через границы раздела сред с различными показателями преломления [27] при исследовании слоистых объектов технического и биологического происхождения в методах корреляционной интерференционной микроскопии [10,[12][13][14][15][16] с целью расширения диагностических и измерительных возможностей этих методов, в частности для увеличения точности определения геометрических и оптических параметров объектов [28], а также для оценки влияния оптических полей на биологические объекты на клеточном уровне [29]. Полагаем также, что полученные результаты и выработанные представления будут полезны для анализа волновых полей других частотных диапазонов, в частности терагерцового диапазона, для которого уже создаются фокусирующие устройства для формирования полей с большой числовой апертурой [30].…”

Section: заключениеunclassified

Мгновенные Спекл-Структуры В Частично Когерентном Оптическом Волновом Поле С Широкими Частотным И Угловым Спектрами

Рябухо¹,

Максимова²,

Мысина³

et al. 2019

Журнал Технической Физики

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We consider the hypothesis of instantaneous volume speckle structures in a partially coherent optical wave field of frequency-broadband radiation from an extended light source. We discuss the spatiotemporal correlation properties of instantaneous speckle structures and the relation of these properties with the spatiotemporal coherent properties of the wave field. We show that the instantaneous speckle structures determine spatial fluctuations of the wave field and its spatial coherent properties. Using numerical calculations of the field of wave perturbations in the near-field diffraction region of the extended light source, we obtain images of instantaneous speckle structures in the longitudinal cross section of the wave field and investigate the correlation properties of the spatial distribution of the instantaneous intensity of the wave field in the direction of its propagation as functions of the width of the frequency spectrum and the width of the angular spectrum of the field. We show that the longitudinal length of instantaneous speckles can be determined either by the width of the frequency spectrum of the field, or the width of its angular spectrum, or, jointly, by the width of the frequency spectrum and the width of the angular spectrum of the field. We find conditions under which instantaneous speckle structures propagate, experiencing decorrelation changes during their propagation, to a distance that is determined by the width of the angular spectrum of the field.

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Effect of decoherence of optical field with broad angular spectrum upon propagation through transparent media interfaces

Cited by 11 publications

References 9 publications

Spatial and temporal coherence effects in interference microscopy and full‐field optical coherence tomography

Spatial and temporal coherence effects in interference microscopy and full‐field optical coherence tomography

Longitudinal spatial coherence of the optical field and its effects in the interference microscopy

Мгновенные Спекл-Структуры В Частично Когерентном Оптическом Волновом Поле С Широкими Частотным И Угловым Спектрами

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