Abstract
A method of temporally compressing picosecond pulses is proposed. To increase the spectral broadening, two picosecond pulses at different central wavelengths are overlapped spatiotemporally to induce a modulation on the intensity envelope, thus leading to a high temporal intensity gradient. The combined pulse is then coupled into a gas-filled hollow-core fiber (HCF) to broaden the spectrum through nonlinear propagation. After that the pulse can be compressed by chirp compensation. This method is demonstrated numerically with two 1-ps/5-mJ pulses centered at 1053- and 1064-nm, respectively, which are coupled into a 250-μm-inner-diameter, 1-m-long HCF filled with 5-bar neon. After nonlinear propagation, the spectrum of the combined pulse is broadened significantly compared with the sum of the broadened spectra of a single 1-ps/10-mJ pulse centered at 1053- and 1064-nm. Under proper initial conditions, the pulse can be compressed down to ~16-fs. The influences of the energy ratio, time delay and wavelength gap between two input pulses, as well as the energy scaling are also discussed. These results show an alternative way to obtain ultrashort laser pulses from the picosecond laser technology, which can deliver both high peak power...Continue Reading
References
Oct 1, 2004·Nature·C G R GeddesW P Leemans
Nov 5, 2004·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·M Kolesik, J V Moloney
Oct 17, 2006·Optics Letters·B F MansourD M Villeneuve
Dec 7, 2007·Optics Letters·J LimpertH R Müller
Apr 15, 1997·Optics Letters·M NisoliF Krausz
Sep 19, 2005·Optics Express·C HauriU Keller
Dec 18, 2010·Optics Letters·P RussbueldtR Poprawe
Mar 17, 2011·Physical Review Letters·Yunquan LiuQihuang Gong
Sep 3, 2013·Physical Review Letters·A GopalG G Paulus
Aug 29, 2014·Optics Letters·Jan RothhardtAndreas Tünnermann
Dec 17, 2014·Optics Letters·Florian EmauryUrsula Keller
Sep 15, 2015·Optics Express·Jan-Philipp NegelThomas Graf
May 4, 2016·Optics Express·Marcus SeidelOleg Pronin
Jul 30, 2016·Optics Letters·Michael MüllerAndreas Tünnermann
Sep 16, 2016·Optics Letters·Steffen HädrichJens Limpert
Oct 18, 2016·Optics Letters·Jan SchultePeter Russbueldt
Aug 10, 2017·Optics Express·Marco PlötnerAndreas Tünnermann