Mundry, J., et al. “Tunable Femtosecond Near-IR Source by Pumping an OPA Directly with a 90 MHz Yb:Fiber Source.”10.1364/AO.56.003104__Applied Optics, vol. 56, no. 11, OSA, 2017, pp. 3104–08, doi:10.1364/AO.56.003104.