Ytterbium (Yb)-based femtosecond lasers have gained significant attention in recent years due to their unique combination of high average power, high pulse energy, and pulse control capabilities for both industrial and scientific applications. In this talk we will review the most recent advancements in obtaining high power infrared (IR) and ultraviolet (UV), while maintaining the stability, as well repetition rate options and wavelength extensions.
Femtosecond optical parametric oscillator (OPO) pumped by second harmonic of Yb: KGW solid state oscillator was investigated. Comparison between LBO and BBO crystals was carried out. The phase mismatch induces cascaded nonlinearity which acts as effective nonlinear refractive index. Negative group delay dispersion (GDD) of the resonator and effective nonlinear refractive index allows linear phase and nonlinear phase compensation leading to soliton like pulse formation. Z-scan experiment was used to determine nonlinear refractive indices under conditions identical to those in the oscillator cavity. Surprisingly, the signs of nonlinear refraction as measured by Z-scan and indirectly observed in optical parametric oscillator were opposite.
Femtosecond optical parametric oscillator (OPO) was investigated, the chirped mirror based OPO was tunable by rotating intracavity crystal in the wavelength range of 680-810 nm with maximum output power of 600 mW and pulse duration below 150 fs. The experimental results were compared with numerical modelling while solving coupled electric field equations in spatial and time domain to include the effects of resonator dispersion and self-phase modulation. The results pave a way for a compact femtosecond optical parametric oscillator tunable in a spectrum band limited by resonator mirrors’ spectral phase characteristics.
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