Abstract
We demonstrate the first Kerr-lens mode-locked operation in a diode-pumped Yb:GdYSiO5 oscillator. Under a diode pump power of 5 W, 141 fs pulses with an average power of 237 mW were obtained at a repetition rate of 118 MHz. The central wavelength was at 1094 nm with a bandwidth of 10.1 nm. Shorter pulses were obtained by adjusting the cavity to operate at a shorter wavelength, resulting in 55 fs pulse duration at the central wavelength of 1054 nm with a bandwidth of 23.5 nm.
Highlights
Diode-pumped ytterbium-doped lasers have received continuous attention in past years due to their high conversion efficiency, high average power, and ultrashort pulse duration [1,2]
We report the first diode-pumped Kerr-lens mode-locking (KLM) of a Yb:GYSO
We firstly characterized the CW properties and wavelength tunability of the Yb:GYSO laser by a simple three-mirror cavity consisting of a plane dichroic mirror, a concave mirror with radii of curvature (ROC) of 200 mm, and a plane output coupler
Summary
Diode-pumped ytterbium-doped lasers have received continuous attention in past years due to their high conversion efficiency, high average power, and ultrashort pulse duration [1,2]. The large lower-level splitting results in a broad emission bandwidth, which is beneficial to generate ultrashort pulses by various mode-locking techniques. The shortest pulse duration reported far was 32 fs in a Yb:CaGdAlO4 oscillator optically pumped by a fiber laser [8] Such femtosecond lasers in the 1 μm wavelength range may be a valuable alternative to Ti:sapphire lasers in many applications. Yb:GYSO crystal (x = 0.5) has a ground state splitting of 995 cm−1 and a fluorescence life time of 1.92 ms, indicating it as a promising candidate for the efficient generation of high-power femtosecond lasers.
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