Femtosecond Laser Oscillator on Yb:KGW Crystal

Abstract A femtosecond laser pulse oscillator based on a Yb:KGW crystal with a repetition rate of 78 MHz and an average power of 2.3 W has been developed. The generated pulse duration is approximately 170 fs with a spectral width at half maximum of approximately 7 nm, with a central wavelength of 1031 nm. High stability of average power and diffraction-limited quality of radiation allow the device to be used as a precision source of femtosecond pulses for various high-power amplifiers, including widely used amplifiers based on Yb:YAG crystals.