Abstract
We report a multi-gigahertz (GHz) repetition-rate femtosecond MgO:PPLN optical parametric oscillator (OPO) harmonically pumped by a 75.6 MHz Kerr-lens mode-locked Yb:KGW laser. By fractionally increasing the OPO cavity length, we obtained OPO operation up to the 493rd harmonic of the pump laser repetition rate, corresponding to a repetition rate as high as 37.3 GHz. Using a 1.5% output coupler, we are able to extract signal pulses with up to 260 mW average power at the 102nd harmonic (7.7 GHz) and 90 mW at the 493rd harmonic (37.3 GHz) under 2 W pump power. The measured relative standard deviations of the fundamental and the 102nd harmonic signal power were recorded to be 0.5% and 2.1%, respectively. The signal pulse durations at different harmonics were measured in the range of 160-230 fs.
Highlights
Ultrafast lasers providing picosecond to femtosecond pulses are of demand in various application areas such as spectroscopy [1], precision measurement [2], biophotonics [3], etc
We report a multi-gigahertz (GHz) repetition-rate femtosecond MgO:PPLN optical parametric oscillator (OPO) harmonically pumped by a 75.6 MHz Kerr-lens mode-locked Yb:KGW laser
It is believed that the multi-GHz repetition-rate femtosecond optical parametric oscillator (OPO) with considerable average power will be a suitable tool in various applications in the near to midIR
Summary
Ultrafast lasers providing picosecond to femtosecond pulses are of demand in various application areas such as spectroscopy [1], precision measurement [2], biophotonics [3], etc. The second approach is so-called higher-order synchronous pumping, which required a very compact, high-repetition-rate ultrafast pump source, while the free spectra range (FSR) of the SPOPO could be several times of the pump laser. In this situation, the repetition rate of the SPOPO is defined by the pump’s, which corresponding to that multiple pulses are circulating in the OPO cavity. The dimension restrictions of the SPOPO for high repetition has been relieved with this method, and all signal pulses have equal intensities compared to the first method This approach is limited to the demands of high-repetition-rate ultrafast lasers with high average power as the pump source. The way indicates that when the cavity lengths of the SPOPO (LSPOPO) and its pump laser (Lpump) satisfy the following equation:
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