Sökning: "second-harmonic generation"

Visar resultat 1 - 5 av 46 avhandlingar innehållade orden second-harmonic generation.

  1. 1. Resonance-enhanced Second Harmonic Generation from spherical microparticles in aqueous suspension

    Författare :Sviatlana Viarbitskaya; Tony Hansson; Micha Bonn; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Nonlinear optics; second harmonic generation; adsorption; molecules; Physics; Fysik; Physics; fysik;

    Sammanfattning : Second harmonic generation (SHG) is a nonlinear optical effect sensitive to interfaces between materials with inversion symmetry. It is used as an effective tool for detection of the adsorption of a substance to microscopic particles, cells, liposomes, emulsions and similar structures, surface analysis and characterization of microparticles. LÄS MER

  2. 2. Many-photon effects in time-resolved second harmonic generation from systems in optical cavities

    Författare :Megha Gopalakrishna; Matematisk fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Second harmonic generation; Cavity optics; Non-linear optics; Cavity leakage; Ultracold atoms; Dicke model; Exact diagonalization; Non-equilibrium Green s functions; Fysicumarkivet A:2024:Gopalakrishna;

    Sammanfattning : Second harmonic generation is popular due to its numerous applications in different technologies dealing with multiple fields of science. The rapid technical advancement with the second harmonic generation demands parallel development in the theoretical understanding. LÄS MER

  3. 3. Second harmonic and sum frequency generation in lithium niobate waveguides

    Författare :Fredrik Laurell; Martin Fejer; KTH; []
    Nyckelord :Fysik; Physics;

    Sammanfattning : .... LÄS MER

  4. 4. Laser diode systems for photodynamic therapy and medical diagnostics

    Författare :Eva Samsöe Andersen; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; quasi-phasematching; photodynamic therapy; laser-induced fluorescence; medical laser systems.; Histology; cytochemistry; histochemistry; tissue culture; Histologi; Laserteknik; Laser technology; cytokemi; histokemi; vävnadskultur; Diagnostik; Diagnostics; second harmonic generation; pulsed lasers; spatial filtering; Diode lasers; optical feedback; Fysicumarkivet A:2004:Samsöe Andersen;

    Sammanfattning : This work concerns techniques for improvement of the coherence properties of diode lasers so that they may be used in two specific medical applications: (Interstitial) photodynamic therapy (PDT) and laser-induced fluorescence diagnostics. In the first application, spatial coherence is crucial, since the treatment light should be delivered through relatively thin optical fibers to optimize treatment and to facilitate minimally invasive treatment. LÄS MER

  5. 5. Molecular Quadratic Response Properties with Inclusion of Relativity

    Författare :Johan Henriksson; Patrick Norman; Juha Vaara; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; relativistic quantum chemistry; molecular physics; clamping levels; four-component Hartree-Fock theory; Kohn-Sham density functional theory; response theory; nonlinear optics; second-harmonic generation; two-photon absorption; excited state properties; optical power limiting; Computational physics; Beräkningsfysik;

    Sammanfattning : This thesis concerns quadratic response properties and their application to properties in Jablonski diagrams such as resonant two-photon absorption and excited state absorption. Our main interest lies in optical power limiting applications, and in this context, molecules containing heavy metal atoms prove superior. LÄS MER