| Abstract [eng] |
Femtosecond optical parametric oscillator technology allows to tune the wavelength of small pulse energy lasers. Tunable wavelength ultrashort pulse lasers are an invaluable tool in nonlinear microscopy and increased output power of the device allows faster imaging of biological specimens. In this dissertation the effects are investigated, which arise when the output power of femtosecond optical parametric oscillator is scaled. An increase of output power leads to unsuspected challenges, such as cascaded nonlinearity induced time and spatial domain phase modulation effects. In this dissertation cascaded nonlinearity influence to optical parametric oscillator characteristics is investigated, when it is synchronously pumped by a high power Yb: doped oscillator. New methods of cascaded nonlinearity control are also investigated. One of such methods is to exploit negative cascaded nonlinearity for soliton generation in optical parametric oscillator with positive cavity group delay dispersion. Numerical modelling allowed to explain non trivial experimental results, such as a higher order soliton generation and their perturbation by the third order of cascaded nonlinearity induced dispersion. Based on the research, a transportable prototype of a femtosecond optical parametric oscillator was assembled, which was tested out in a field leading application laboratories of nonlinear microscopy, nonlinear photopolymerization and nonlinear optogenetics. |
