Nonlinear ellipse rotation measurements in optical thick samples

Miguez, M. L.; Barbano, E. C.; Coura, J. A.; Zílio, Sérgio Carlos; Misoguti, Lino

doi:10.1007/s00340-015-6178-x

Cited by 29 publications

(32 citation statements)

References 17 publications

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“…In a recent study, our NLO response functions have also been used to interpret the results of mid-infrared supercontinuum generation from CS 2 -core optical fibers, which helps us understand new hybrid soliton dynamics as a result of the noninstantaneous NLR of CS 2 [31,32]. Recently, seven solvents (also included in this work) were studied along with CS 2 using nonlinear ellipse rotation (NER) experiments [33,34] for a range of pulse widths, from which predictions of n 2,eff are given using an empirical model [29]. To open up more possibilities for other materials to be used in NLO applications, we follow the same BD methodology as [20,25] to perform extensive experimental characterizations on the third-order NLO response functions for 24 widely used organic solvents, as listed in Table 1.…”

Section: Introductionmentioning

confidence: 99%

Temporal and polarization dependence of the nonlinear optical response of solvents

Zhao

Reichert

Benis

et al. 2018

Optica

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It has long been known that nonlinear refraction in solvents can depend on pulse width, and this along with experimental uncertainties has led to orders-of-magnitude disagreements in nonlinear refractive coefficients reported in the literature. To resolve this issue, we perform beam-deflection (BD) measurements of the rigorously defined nonlinear impulse response function for 24 commonly used solvents selected from various classes of molecules. Using this polarization-resolved BD, the bound-electronic and the three major nuclear contributions are separately measured by determining the magnitudes, symmetry, and temporal dynamics of each mechanism. This allows us to construct the response functions that we use to accurately establish self-consistent references for predicting and interpreting the outcomes of other experiments performed on these materials over the temporal range from 10 fs to 1 ns. The results also provide insight into relating solvent nonlinearities with their molecular structures and exploring the effects of the Lorentz-Lorenz local field. We find that nonconjugated molecules with small polarizability anisotropy exhibit negligible reorientational response, and hence the nonlinear refraction is almost independent of pulse width. Knowledge of the response functions also allows engineering the transient nonlinear refractive properties of solutions of organic dyes, for example, materials with effectively zero nonlinear refraction.

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Section: Introductionmentioning

confidence: 99%

Temporal and polarization dependence of the nonlinear optical response of solvents

Zhao

Reichert

Benis

et al. 2018

Optica

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“…Neste caso, a rotação da polarização elíptica do feixe é determinada pelo uso do lock-in e de um polarizador girante. Fonte: Adaptada de Miguez (40). Para a realização da microscopia, ou em alguma medida da RNLPE, ao fazer girar um polarizador (analisador), uma modulação tipo cosseno pode ser observada no osciloscópio.…”

Section: Rnlpe Em Amostras Grossasunclassified

Desenvolvimento de uma microscopia óptica não linear por rotação da polarização elíptica

Gomes¹

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A Deus que me proporcionou ser o que sou diante de todas as dificuldades e resignação para nunca desistir diante dos obstáculos e me fazer conhecedor de que não importa o tamanho da montanha, pois ela nunca poderá tampar o sol.A minha mãe Glória Cele Coura Gomes, heroína que me deu apoio, incentivo nаs horas difíceis, de desânimo е cansaço.Meu pai Valdez Juval Rocha Gomes, qυе apesar dе todas аs dificuldades mе fortaleceu е qυе pаrа mіm foi muito importante.Aos meus irmãos Danilo José Coura Gomes, Valdez Juval Rocha Gomes Filho e ao meu querido sobrinho Danilo Manoel que sempre torceram pelo meu crescimento profissional e que sеmprе fizeram entender qυе о futuro é feito а partir dа constante dedicação nо presente.Ao Prof. Dr. Lino Misoguti pela atenção e apoio durante o processo de definição e orientação, bem como pela oportunidade de realizar o mestrado contribuindo para o meu crescimento pessoal e profissional.Ao Instituto de Física de São Carlos, pela oportunidade de realização do curso de mestrado.A todos (amigos e professores) do grupo Fotônica.Agradeço а todos оs professores pоr mе proporcionarem о conhecimento nо processo da formação profissional, nãо somente pоr terem mе ensinado, mаs por terem mе feito aprender.A CNPq (Conselho Nacional de Pesquisa), pelo apoio financeiro com a manutenção da bolsa de auxílio durante o curso de mestrado, contribuindo para a finalização de uma importante etapa da minha vida. The use of nonlinear optical processes is one approach used in the optical microscopy, to obtain three-dimensional (3D) images, without destruction, of transparent objects. The acquisition of 3D images is an important resource to allow better visualization of those objects with internal complex structures. Various nonlinear optical processes are used in microscopy; for example, second-harmonic generation, third-harmonic generation, two-photon absorption, fluorescence induced by two-photon absorption, etc. which one with particular characteristics, advantage and disadvantage, etc. An interesting refractive nonlinearity, the nonlinear elliptical polarization rotation (NEPR) which is a Kerr nonlinearity similar to self focusing. Through NEPR, it is possible to determine the absolute magnitude of nonlinearity location, and this feature is possible to develop even never used microscopy. The NEPR signal is not regularly used for microscopy due to its difficult measurement.However, recently a new accurate and simple method of measurement NEPR was developed with use of rotating polarizer and a dual-phase lock-in amplifier. In this way, in this work we propose a proof of concept of one simple microscopy using the NEPR signal. We assembled a optical microscopy based on NEPR measurement using a rotating polarizer, a dual phase lock-in, low cost components, and a femtosecond laser system. We have successfully obtained image of glass capillaries, optical fibers, glass beds and onion cells.

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“…Equation (27) shows that the larger the radius or the refractive index difference, the bigger is amount of modes supported by SIF fiber. Conversely, there is a lower limit, down to the point where only one mode is allowed to propagate.…”

Section: Propagation Modesmentioning

confidence: 99%

“…The NER effect is employed, in our research group, as a technique to evaluate the materials NLO refractive index. 103 NER is a stablished technique for measuring 2 in solid and liquids [26][27][28][104][105][106] , also in the presence of two-photon absorption 107 and having been used even as an innovative tool for imaging microscopy. 108 Our group extended NER measurements into gaseous samples, improved the acquisition method and explored even further its characteristics.…”

Section: A New Way Of Evaluatementioning

confidence: 99%

“…Very recently, our group (Photonic's group -University of São Paulo) have developed an experimental setup for accurately measuring the nonlinear ellipse rotation (NER) effect and evaluating 2 of liquid and solid materials. [26][27] Additionally, we manage to measure this parameter as a function of the excitation pulse width ( ), from which we were able to evaluated and distinguish the amount of contribution coming from electronic nonresonant (ENR) and molecular orientation (MO) physical mechanism responsible for the material 2 . 28 Furthermore, a comparison of NER and the well-established Z-Scan technique for the study of we explore in deep relationship between the third order susceptibility ( (3) ) elements associated with each effect of those effects.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of gases nonlinear refractive index and energetic deep UV generation in hollow core fiber

Souza¹

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I thank the Photonic's group members, for every group meeting and interaction. I have definitely learned a lot. Special thanks goes to my colleague Emerson Cristiano Barbano. Our scientific and personal exchange were among the highest points of my graduation. A man to be remembered. My sincere gratitude to all IFSC-USP community, who has provided a very rich and pleasant environment along all my graduation. As much as I live, I would never forget those days. Standing out, I mention Evandro Ares, a true friend! I thank all my ICFO colleagues, highlighting my host Jens Biegert and my mentor Maurizio Reduzzi during my internship at Attosecond and Ultrafast Optics group. There, I matured my knowledge in nonlinear optics. I am aware my personal debt with my family will never be paid. I hope I can honor them. Fabiola Ferreira de Almeida, my best friend. We grew up together. During the writing of this Thesis, I had one target in mind, the forthcoming students. I wrote for them. I am going to feel realized if they use my accumulated experience to fly higher and further. My work is something to be overcome, it is a step into your Selbstüberwindung. I also thank CAPES for the scholarship, FAPESP and CNPq by financial support. This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-Brasil (CAPES)-Finance Code 001. "The task is not so much to see what no one has seen yet; but to think what nobody has thought yet, about what everybody sees."

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Nonlinear ellipse rotation measurements in optical thick samples

Cited by 29 publications

References 17 publications

Temporal and polarization dependence of the nonlinear optical response of solvents

Temporal and polarization dependence of the nonlinear optical response of solvents

Desenvolvimento de uma microscopia óptica não linear por rotação da polarização elíptica

Characterization of gases nonlinear refractive index and energetic deep UV generation in hollow core fiber

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