Abstract
We are developing directly diode-pumped femtosecond lasers for industrial applications. A mode-locked Yb:KYW laser with the pulse duration of 113 fs has been developed as a seed laser. An Yb:KGW crystal in the regenerative amplifier is pumped by a 75-W fiber-coupled laser diode. The seed pulse was amplified to 0.82 mJ at the repetition rate of 1 kHz. At the repetition rate of 100 kHz, the averaged output achieved more than 3 W after pulse compression. The power stability during four hours was 1.56 % (3σ). We confirmed that the amplified pulse was compressed to nearly Fourier transform limit. The calculated transform limited pulse width and the measured pulse width was 319 fs and 339 fs, respectively.
Published Version
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