We demonstrate a compact high-power ultraviolet multiwavelength femtosecond laser source, where both an oscillator and an amplifier are based on a diode-pumped ytterbium-doped single-polarization large-mode-area photonic-crystal fiber and multiple wavelengths are generated through cascaded frequency mixing in nonlinear crystals. Tunable ultraviolet pulses within the wavelength range from 257 to 263 nm have been produced with maximum average powers of 2.14 and 0.81 W for pulse widths of 410 and 120 fs, respectively, through fourth-harmonic generation in different lengths of β-barium borate crystal.
© 2010 Optical Society of America
Original Manuscript: May 20, 2010
Revised Manuscript: August 31, 2010
Manuscript Accepted: September 1, 2010
Published: October 13, 2010
Huagang Liu, Minglie Hu, Bowen Liu, Youjian Song, Lu Chai, Aleksei M. Zheltikov, and Chingyue Wang, "Compact high-power multiwavelength photonic-crystal-fiber-based laser source of femtosecond pulses in the infrared–visible–ultraviolet range," J. Opt. Soc. Am. B 27, 2284-2289 (2010)