Ultrafast thulium-doped fiber-oscillator with pulse energy of 4.3 nJ.
A femtosecond fiber laser based on thulium-doped double-clad silica fiber with an internal dispersion compensation is presented that generates pulses at a center wavelength of 1976 nm with an energy of 4.3 nJ and a duration of 1.2 ps. The dechirped pulse duration is 294 fs. The pulse energy is more than 2 orders of magnitude above the pulse energy demonstrated previously. Mode locking is achieved using additive pulse mode locking, and dispersion compensation is facilitated by a grating stretcher arrangement.
Engelbrecht
Martin
M
Laser Zentrum Hannover e.V., Hollerithallee, Hannover, Germany. m.engelbrecht@lzh.de
Haxsen
Frithjof
F
Ruehl
Axel
A
Wandt
Dieter
D
Kracht
Dietmar
D