High-energy laser pulse with a submegahertz repetition rate from a passively mode-locked fiber laser.
We demonstrate an ultralong cavity, all-fiber, all-normal-dispersion Yb-doped fiber laser that is passively mode locked by a semiconductor saturable absorber mirror (SESAM). Without any discrete dispersion-compensation components or conventional spectral filters, the SESAM works together with the strongly chirped pulse and the nonlinearity induced spectrum broadening to perform a filtering-equivalent function, thus stabilizing the mode locking. The laser generates 4.3 nJ stable mode-locked pulses with a 397 kHz fundamental repetition rate at a 1068 nm central wavelength.
Tian
Xiaolong
X
Network Technology Research Centre, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Drive, Singapore 637553. tian0011@ntu.edu.sg
Tang
Ming
M
Shum
Perry Ping
PP
Gong
Yandong
Y
Lin
Chinlon
C
Fu
Songnian
S
Zhang
Taishi
T
D000042:Absorption; D007834:Lasers; D055620:Optical Phenomena; D012666:Semiconductors