Sökning: "Second harmonic generation"

Visar resultat 1 - 5 av 69 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

3. 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

4. 3. Second-generation High-Order Harmonic Sources — From CPA to OPCPA

   Författare :Piotr Rudawski; Atomfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Optical parametric chirped pulse amplification; Fysicumarkivet A:2014:Rudawski; Chirped pulse amplification; High-order harmonic generation; Attosecond pulse;

   Sammanfattning : This thesis presents two sources of extreme ultraviolet (XUV) radiation based on high-order harmonic generation (HHG) in gases. The sources were developed for experiments requiring high-flux harmonic beams or HHG pulses at high-repetition rate. These were used experimentally to image nano-scale objects. LÄS MER

5. 4. Optimization of High-order Harmonic Generation for Attosecond Science

   Författare :Robin Weissenbilder; Atomfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; High-order Harmonic Generation; Attosecond Pulse Train; attosecond dynamics; photoelectron interferometry; Quantum state tomography; Phase matching; Fysicumarkivet A:2023:Weissenbilder;

   Sammanfattning : High-order harmonic generation is a highly nonlinear, though inherently inefficient, process which can lead to emission of coherent, broadband extreme ultraviolet radiation in the form of attosecond pulses. Attosecond pulses are crucial for experiments investigating photoionization dynamics on the femto- and attosecond timescales. LÄS MER

7. 5. Piezoelectric Generation and Damping of Extensional Waves in Bars

   Författare :Anders Jansson; Bengt Lundberg; Urmas Valdek; Peter Olsson; Uppsala universitet; []
   Nyckelord :Technology; Piezoelectric; wave; generation; damping; bar; TEKNIKVETENSKAP;

   Sammanfattning : This thesis focuses on the electromechanical processes of generation and damping of transient waves in bars with attached piezoelectric members. In particular, the influence of amplifier and electrical circuitry on the mechanical waves is of interest. LÄS MER