Abstract

At present, direct generation of an ultrafast laser with a pulse width shorter than 10 ps in the visible spectral region has been very rarely demonstrated. In this work, we focus on this issue by operating an InGaN blue-diode-pumped Kerr-lens mode-locked Pr:LiYF₄ laser. Using an undoped CaGdAlO₄ crystal as an additional Kerr medium in the resonator for providing enhanced third-order nonlinearity, a stable mode-locked Pr:LiYF₄ laser with red emission at 639 nm is achieved with the shortest pulse duration of 2.6 ps at a repetition rate of 49.7 MHz. The maximum average output power, single pulse energy, and peak power reach 68.4 mW, 1.38 nJ, and 530 W, respectively. To the best of our knowledge, this is the shortest pulse width that has ever been achieved in this specific emission line of Pr³⁺ ions.

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