| Abstract [eng] |
Influence of Positive Dispersion on Synchronously Pumped Optical Parametric Oscillator's Spectral and Power Characteristics There is a great need for coherent light source, that could be tunable in wide spectral range and could work at high repetition rates (> 50 MHz) in many scientific areas such as spectroscopy, photochemistry, material science and others. In this work we investigate synchronously pumped optical parametric oscillator based on BBO nonlinear crystal. Most of the optical parametric systems at the moment are pumped with Ti:Saphire lasers. However Ti:Saphire optical parametric systems have some disadvantages, such as they require a lot of space and are expensive, plus their output power is restricted due to high Ti:Saphire heat load. That is why we are presenting an investigation on synchronously pumped optical parametric oscillator pumped with femtosecond Yb:KGV laser oscillator’s second harmonic (515nm). In this work we presented a synchronously pumped optical parametric oscillator tunable over 630 – 850 nm spectral range. Maximum output power of oscillator operating in low dispersion regime was 280 mW. Output power decreased to 259 mW and 144 mW as group delay dispersion was increased. Signal to pump power conversion efficiency was 15,1%, 14% and 7,8% correspondingly. We also measured spectral width of pulses around 725 nm signal wavelength, oscillating in low, medium and high group delay dispersion which corresponded to 34, 17 and 4 nm and corresponding pulses durations were 329, 382 and 635 fs. |
