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Journal Article

3 GHz, Yb-fiber laser-based, few-cycle ultrafast source at the Ti:sapphire laser wavelength


Zia,  Haider
Center for Free-Electron Laser Science, DESY and University of Hamburg, Notkestraße 85, D-22607 Hamburg, Germany;
International Max Planck Research School for Ultrafast Imaging & Structural Dynamics (IMPRS-UFAST), Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Chen, H.-W., Zia, H., Lim, J., Xu, S., Yang, Z., Kärtner, F. X., et al. (2013). 3 GHz, Yb-fiber laser-based, few-cycle ultrafast source at the Ti:sapphire laser wavelength. Optics Letters, 38(22), 4927-4930. doi:10.1364/OL.38.004927.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002A-E295-C
We demonstrate a compact ultrafast source centered at 850 nm with >200  nm bandwidth (full width at half-maximum) based on a 3 GHz Yb-fiber master-oscillator-power-amplifier system. The output pulses (with up to 13 W average power) from the laser system are coupled into short (<50  mm) pieces of photonic crystal fibers to excite broadband fiber-optic Cherenkov radiation; the resulting broad phase-matching bandwidth due to short fiber length produces an upconverted spectrum spanning in the wavelength range of 750–950 nm with average power of 94, 184, and 380 mW for fiber length of 28, 37, and 48 mm, respectively. The spectrum generated from the 37 mm fiber is then dechirped by eight double-chirped mirrors, leading to compressed pulses ∼14  fs in duration. Such an ultrafast source is a promising substitute of multigigahertz mode-locked Ti:sapphire lasers for applications in optical frequency metrology and multiphoton coherent microscopy.