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Opt Express. 2008 Jun 9;16(12):8629-40.

High-power, femtosecond, thermal-lens-shaped Yb:KGW oscillator.

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  • 1Department of Physics (m/c 273), University of Illinois at Chicago, 845 W. Taylor Street (rm. 2236), Chicago, IL 60607-7059, USA. jberge2@uic.edu


Thermal lens shaping for astigmatism compensation is extended to a high-power, diode-pumped, Yb:KGW laser by employing a gain crystal geometry designed for efficient polarized pumping. The 63MHz oscillator is soliton mode-locked with the aid of a saturable Bragg reflector to yield 250fs (347fs) pulses at an output power of 3.5W (5W). Frequency doubling of the 250fs pulses with an intrinsic efficiency >60% provides 1.65W of average green power.

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