High average and peak power femtosecond large-pitch photonic-crystal-fiber laser Baumgartl, Martin ; Jansen, Florian ; Stutzki, Fabian ; Jauregui, Cesar ; Ortaç, Bülend ; Limpert, Jens ; Tünnermann, Andreas Abstract Publication: Optics Letters Pub Date: January 2011 DOI: 10.1364/OL.36.000244 Bibcode: 2011OptL...36..244B