We demonstrate a chromium-doped forsterite femtosecond ring laser that generates 30-fs pulses at a 420-MHz repetition rate with nearly 500 mW of average power. The compact solid-state design and broad spectral output make this laser attractive for telecommunications applications in the 1.3–1.5-μm region. Additional spectral broadening of the laser output in highly nonlinear optical fiber leads to octave-spanning spectra ranging from 1.06 to 2.17 μm . The octave is reached at a level of 18 dB below the peak. The underlying optical frequency comb can be linked to existing optical frequency standards.
© 2003 Optical Society of America
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.4370) Fiber optics and optical communications : Nonlinear optics, fibers
(140.0140) Lasers and laser optics : Lasers and laser optics
(320.0320) Ultrafast optics : Ultrafast optics
I. Thomann, A. Bartels, K. L. Corwin, N. R. Newbury, L. Hollberg, Scott A. Diddams, J. W. Nicholson, and M. F. Yan, "420-MHz Cr:forsterite femtosecond ring laser and continuum generation in the 1-2-μm range," Opt. Lett. 28, 1368-1370 (2003)