Abstract
Both tunable and passively mode-locked laser oscillators based on an efficient Yb,Gd:SrF2 crystal are reported for the first time. Charge compensation ions of Gd3+ enhanced the emission and absorption cross section of Yb,Gd:SrF2 crystal markedly. With the aid of birefringent filter, a 61.1-nm continuous-wavelength-tunable laser from 1020.2 to 1081.3 nm was obtained, making it a potential candidate for ultrafast lasers. Based on a semiconductor saturable absorber mirror, a diode-pumped passively mode-locked laser with the pulse width of 951 fs was realized. The oscillator operated at a repetition rate of 92 MHz.
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