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Showing 1 to 20 of 98 for “"SHG"”.
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Implementation of side-fringe locking in an SHG cavity
… method for locking a second-harmonic generation (SHG) cavity on resonance is described and implemented. The usual method, Pound-Drever-Hall locking, is prone to long-term power fluctuations from power variations in the incident laser. When using the second harmonic field for squeezing, these power …
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The study of surface SHG and polygonal microcavity design for nonlinear applications on LiNbO<sub>3</sub>
… for the surface second harmonic generation (SHG) studies and for the designs of polygonal microcavities for nonlinear applications. <br/><br/>Reflection second harmonic generation (RSHG) experiments were performed on LiNbO<sub>3</sub> to reveal the interfacial layer symmetry as the crystal is …
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In Situ Studies of Surface Electric Field on Cobalt Oxide Electrode Surfaces with Second Harmonic Generation (SHG)
… films. An optical electrochemistry cell, and an SHG setup were built, and EFISH response on Co/Co (hydr)oxide/solution sample was collected, with different EC methods applied simultaneously. Electrochemical impedance measurement (EIS), in situ Raman, and chronoamperometry were also applied to the …
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Quantification of collagen fiber organization in biological tissues at cellular and molecular scales using second-harmonic generation imaging
… for the process of second harmonic generation (SHG) when exposed to intense incident light. Consequently, SHG microscopy has been frequently employed in medicine and biology to obtain high-contrast 3D images of collagen fibers without the need for staining. Quantification of collagen fiber …
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Silica Fiber with Large and Thermodynamically Stable Second Order Optical Nonlinearity
… molecules, strong and thermodynamically stable SHG can be obtained. Our experiments also provide strong evidence for the theory. Start from the basic Maxwell equation, we derive the SHG efficiency that the excited power translates into the SHG signal. According to the SHG efficiency equation, a …
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Identification of quantitative second-harmonic generation imaging metrics for collagenous tissue
Second-harmonic generation (SHG) imaging has high specificity to collagen, sub-micrometer resolution, and optical sectioning capability. It is applied to various unstained collagenous specimens to explore the microstructure. Since collagen is one of the most abundant proteins in biological tissue, …
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Quantifying collagen-based biological tissues using Fourier-transform-second-harmonic generation imaging
… Fourier transform-second-harmonic generation (FT-SHG) imaging to quantify the arrangement of collagen fibers in biological tissues in 3D. Collagen is the primary structural protein in the human body. Depending on the spatial arrangement of collagen fibers, collagen-based biological tissues can …
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Wide-field Polarimetric Second Harmonic Generation Microscopy for Histology Imaging
… mechanisms including second harmonic generation (SHG), third harmonic generation (THG) and multiphoton excitation fluorescence (MPEF) that can contribute with additional information to hematoxylin and eosin (H&E) stained tissue histopathology, which is used as a gold standard for cancer …
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In Vivo Assessment of the Forward to Backward Ratio of Second Harmonic Generation By Collagen As Part of a Non-Invasive, All-Optical Biopsy for Skin Cancer
… scatter due to Second Harmonic Generation (SHG) in collagen can indicate pathology in skin. SHG, a non-linear optical process where two near-infrared photons of a certain energy are converted to one UV photon of twice the energy at a non-centrosymmetric molecule such as collagen. It has been …
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DEGENERATE SECOND ORDER NONLINEAR OPTICAL SPECTROSCOPY OF CHIRAL WEYL SEMIMETALS
… anisotropy second harmonic generation (RA-SHG) and transient grating. In our work on SHG, we describe a fast-reflective optic-based rotational anisotropy nonlinear harmonic generation spectrometer built upon synchronization of stepper motors and a voice-coil fast turning motor with data …
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Gemeinschaftliche Selbsthilfe nach einem Schlaganfall : die Determinanten der Inanspruchnahme
… möglicher direkter Einflussfaktoren auf eine SHG-Inanspruchnahme betrachtet, sondern auch die Rolle potentieller modifizierender Variablen berücksichtigt. Da es nicht ausreicht, SHG-Teilnehmer nach den Motiven ihres SHG-Beitritts zu befragen, wurde eine Kontrollgruppe von …
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Coupling qualitative and quantitative analyses of pharmaceutical materials enabled by second harmonic generation microscopy
… of a drug product. Second harmonic generation (SHG) microscopy has recently been developed as a selective and rapid method for imaging crystallinity in drug formulations. While SHG microscopy can enable the high signal-to-noise (SNR) detection of crystallinity, the intrinsic chemical information …
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Polarization-dependent nonlinear optical microscopy methods for the analysis of crystals and biological tissues
… crystals. Second harmonic generation (SHG) imaging has been developed as a fast, non-destructive and sensitive method for the selective identification of protein crystals, even in highly scattering environments. Polarization-dependent SHG microscopy methods were developed to assess the …
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Application of beam shaping in second-harmonic generation microscopy
Second-harmonic generation (SHG) microscopy, based on the second-order nonlinear susceptibility, has been established as a sub-micrometer resolution, label-free optical imaging method. Due to its selectivity for non-centrosymmetric structures and inherent confocality, SHG imaging has been used to …
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Two-photon absorption and nonlinear polariton effects in organic crystals
… excitation (TPE) and second harmonic generation (SHG) have been studied in phenanthrene crystals at low temperatures (2 to 6K) in order to investigate mechanisms of two-photon absorption (TPA), the relationship between TPE and SHG, and polariton effects. The transition studied is of special …
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Second Harmonic Generation – A Novel Approach in Retinal Imaging
… the utilization of Second Harmonic Generation (SHG) for label-free imaging of microtubules (MTs) in the retinal nerve fiber layer (RNFL). MTs are an important part of axonal cytoskeleton, providing structural support and serving as a railroad in intracellular transport. We demonstrate the …
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Second Harmonic Generation Stimulated Electromagnetic Emissions during High Power High Frequency Radio Wave Interaction with the Ionosphere
… near 2ω0 is known as second harmonic generation (SHG). SHG is longstanding and well-established in the field of Laser Plasma Interactions (LPI) where SHG has been harnessed to yield diagnostics such as the velocity of the critical region of the plasma, inference of the region in the plasma where …
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Plasmonic Enhancement of Nonlinear Optical Responses by Gold Nanorods
… light, it is possible to greatly enhance the SHG efficiency. To demonstrate this, the surface of the gold nanorods was functionalized with a nonlinear-optical (NLO) polymer, PCBS, via the layer-by-layer method and deposited on a polymer thin film created on a glass substrate using the ionic …
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Second-harmonic generation as a probe of chemically modified Si(111) surfaces and the initial oxidation of hydrogen terminated Si(111)
Optical second-harmonic generation (SHG) is used to probe Si(111) surfaces with covalently attached monolayers. The surfaces are prepared using wet chemical modification to form -H, -C 10 H 21 (decyl) and -O-C 10 H 21 (decyloxy) monolayers. The SHG efficiency for these surfaces as well as a Si(111) …
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SPINS : spectral phase interrogation using nonlinear spectra
… An algorithm is employed to generate trial SHG and THG spectra based on the measured fundmental spectrum and a trial phase. The phase is adjusted iteratively until the best match between the trial and measured SHG and THG spectra is obtained. The technique is experimentally simple, not …
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