Abstract
We demonstrate a room-temperature operation of the near-infrared femtosecond optical parametric oscillator based on MgO-doped stoichiometric periodically-poled lithium niobate, which is synchronously pumped by a Kerr-lens mode-locked Ti:sapphire laser. Wide tunability in the range from 0.98 microm to 1.50 microm was enabled for a single set of cavity mirrors by incorporating a BK7 window as an output coupler. For the output coupling ratio of 3.7%, the threshold pumping power of 460 mW and the slope power conversion efficiency of 37% were achieved. By controlling dispersion values with intra-cavity prisms, femtosecond pulses as short as 66 fs could be obtained.
Highlights
Pumped femtosecond optical parametric oscillators (OPO), enabling the ultrashort light sources tunable in the near- and mid-infrared as well as in the visible [1,2,3], have been proved to be attractive sources for laser applications in such fields like timeresolved spectroscopy and coherent light-matter interactions [4,5]
We demonstrate a room-temperature operation of the nearinfrared femtosecond optical parametric oscillator based on MgO-doped stoichiometric periodically-poled lithium niobate, which is synchronously pumped by a Kerr-lens mode-locked Ti:sapphire laser
The pulse duration is longer for negative or positive dispersions, the signal spectrum is found to be less sensitive to the cavity length fluctuations
Summary
Pumped femtosecond optical parametric oscillators (OPO), enabling the ultrashort light sources tunable in the near- and mid-infrared as well as in the visible [1,2,3], have been proved to be attractive sources for laser applications in such fields like timeresolved spectroscopy and coherent light-matter interactions [4,5]. In the QPM, the phase mismatch occurring due to the dispersed group velocity with wavelength inside a medium, is relaxed by an artificial periodicity of the poling direction, as was demonstrated for periodically poled lithium niobate (PPLN) and KTP [7,8]. For the QPM, the parametric conversion condition can be manipulated with the poling period in the fabrication, and it can utilize the largest nonlinear coefficients of the crystal. We demonstrate the operation of a novel femtosecond OPO based on MgOdoped stoichiometric PPLN, which is synchronously pumped by a Kerr-lens mode-locked Ti:sapphire laser. The wavelength tunability as a function of the pump wavelength, and spectral and temporal characteristics of output pulses are discussed depending on the total intra-cavity dispersion
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