Abstract
Cr3+:LiCAF is a very promising material for compact femtosecond laser sources because of its low quantum defect, a broadband emission range around 800 nm, and an absorption band in a spectral range where high-brightness laser diodes are available. For applications such as seeding, ultra high resolution optical coherence tomography, or metrology a compact replacement for the Ti:sapphire oscillator would be highly desirable. Although the gain bandwidth of Cr3+:LiCAF supports pulses substantially shorter than 10 fs, the shortest pulse width so far demonstrated from a mode-locked Cr3+:LiCAF -Laser is 19 fs [2]. It has been suggested that higher order dispersion and the strong Raman-effect occurring in Colquiirite crystals [2, 3, 4] which leads to a red shift of the spectrum each pass through the gain medium is limiting short pulse generation.
© 2002 Optical Society of America
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