Single shot interferometric method for measuring the nonlinear refractive index

Dancus, I.; Popescu, S. T.; Petriş, A.

doi:10.1364/oe.21.031303

Cited by 19 publications

(11 citation statements)

References 16 publications

(29 reference statements)

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“…Dynamic applications present problems in performing identifications during roll-to-roll production; it is often sufficient to evaluate sample information only inline because the second lateral measurement axis is supplied by the movement of the substrate. However, achieving high precision is complicated by the type of profile algorithm the application uses to extract the surface characterisation from the sample [9,10]. Improvements in online techniques for surface profile measurement will prove beneficial by enabling many high-precision and ultraprecise manufacturing applications and reducing their costs of operation.…”

Section: Introductionmentioning

confidence: 99%

Development of a spatially dispersed short-coherence interferometry sensor using diffraction grating orders

2017

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Modern manufacturing processes can achieve good throughput by requiring that manufactured products be screened by better quality control exercised at a quicker rate. This trend in the quality control of manufactured products increases the need for process-oriented precision metrology capable of performing faster inspections and yielding valuable feedback to the manufacturing system. This paper presents a spatially dispersed short-coherence interferometry sensor using diffraction orders of the zeroth and first order for a diffraction grating introduced as a new compact system configuration for surface profile measurement. In this modified design, the diffraction grating acts as the beam splitter/combiner. Diffractions for the zeroth and first orders are represented by the reference and measurement arms, respectively, of a Michelson interferometer, which reduces the optical path length. This innovative design has been proven effective for determining the step-height repeatability in the sensor range from 27 nm to 22 nm for profiles spanning the step heights of the tested specimens.

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Section: Introductionmentioning

confidence: 99%

Development of a spatially dispersed short-coherence interferometry sensor using diffraction grating orders

2017

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“…Until now, several approaches to measure the nonlinear optical properties of the material have been proposed. These methods are based on Z-scan approach [5], interferometric pump-probe configuration [15], integrated digital holography for measuring thermal lens (TL) and thermal mirror (TM) effects induced by femtosecond laser pulses [16], time-resolved digital holographic microscopy [17,18] etc. Meanwhile, the investigation of the spatial distribution of the samples with inhomogeneous nonlinear refractive index has been reported using point-by-point scanning of the sample [19,20].…”

Section: Introductionmentioning

confidence: 99%

Investigation Of Nonlinear Optical Properties Of Quantum Dots Deposited Onto The Sample Glass Using Time-resolved Inline Digital Holography

Белашов¹,

Shevkunov²,

Kolesova³

et al. 2022

Preprint

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We report on the application of time-resolved inline digital holography to study the nonlinear optical properties of quantum dots deposited onto the sample glass. Fresnel diffraction patterns of the probe pulse due to noncollinear degenerate phase modulation induced by the femtosecond pump pulse were extracted from the set of inline digital holograms and analyzed. Absolute values of the nonlinear refractive index of both sample glass substrate and the deposited layer of quantum dots were evaluated using the proposed technique. To characterize the inhomogeneous distribution of samples’ nonlinear optical properties we proposed to plot an optical nonlinearity map calculated as a local standard deviation of diffraction patterns intensity induced by noncollinear degenerate phase modulation.

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“…Среди возможных техник измерения оптических нелинейных фоторефрактивных свойств можно выделить методы интерферометрии и цифровой голографии [4][5][6][7][8][9][10]. Ранее для решения задач измерения распределений нелинейного показателя преломления в образце было предложено использовать измерение локального нелинейного показателя преломления с поточечным сканированием образца [11,12].…”

Section: Introductionunclassified

О Возможности Исследования Доли Неоднородностей Оптических Нелинейных Сред С Помощью Осевой Цифровой Голографии С Временным Разрешением

Белашов¹,

Чжень²,

Петров³

2021

Журнал Технической Физики

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An approach to determining the fraction of local inhomogeneities nonlinear refractive index n2 in a transparent medium is considered. Data recording was performed using inline digital holography with femtosecond time resolution, where a set of probe beam inline digital holograms in the Fresnel diffraction zone to be recorded at various time delays between the pump and probe pulses. Digital holograms contain diffraction patterns that have information about the induced degenerate non-collinear phase modulation formed in the presence of nonlinear refractive index inhomogeneities. The developed algorithm is based on the calculation of the diffraction patterns Fourier spectrum and analysis of the intensity at zero spatial frequency. The proposed method has been validated in numerical modeling. An approach to determining the fraction of local inhomogeneities nonlinear refractive-index coefficient n2 in a transparent medium is considered. Data recording was performed using time-resolved inline digital holography, where a set of inline digital holograms in the Fresnel diffraction zone to be recorded in a probe beam at various time delays between the pump and probe pulses. Digital holograms contain diffraction patterns that have information about the induced degenerate noncollinear phase modulation formed in the presence of nonlinear refractive index inhomogeneities. The developed algorithm is based on the calculation of the diffraction patterns Fourier spectrum and analysis of the intensity at zero spatial frequency. The proposed method has been validated in numerical simulation.

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Single shot interferometric method for measuring the nonlinear refractive index

Cited by 19 publications

References 16 publications

Development of a spatially dispersed short-coherence interferometry sensor using diffraction grating orders

Development of a spatially dispersed short-coherence interferometry sensor using diffraction grating orders

Investigation Of Nonlinear Optical Properties Of Quantum Dots Deposited Onto The Sample Glass Using Time-resolved Inline Digital Holography

О Возможности Исследования Доли Неоднородностей Оптических Нелинейных Сред С Помощью Осевой Цифровой Голографии С Временным Разрешением

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