Li Mingzhong

High power, strictly single transverse mode ytterbium-doped large mode area fiber amplifier

The paper reports a high power, strictly single transverse mode ytterbium-doped large mode area fiber amplifier with backward pump scheme that produces near diffraction-limited, 2-ns shaped pulses with energies of 38µJ and peak powers in excess of 39kW at a repetition rate of 1Hz.

High concentration Yb3+-doped passive mode-locked fiber ring laser

Theory and experimental results on the self-starting passive mode-locked Yb fiber ring laser generating short pulse are reported. The relations between the laser cavity parameters and mode-locked pulse characters are discussed. 980 nm LD pumped laser is used as the pump source and high concentration Yb 3+ -doped fiber is adopted as gain medium. Using the nonlinear polarization rotation (NPR) effect of the fiber, self-starting stable mode-locked pulse is obtained, with center wavelength of 1046nm, 3 dB bandwidth of 6.01 nm and 20 dB bandwidth of 16 nm. The mode-locked threshold power is 150 mW and output power is 26 mW with 50 MHz repetition rate.

Highly-doped Yb/sup 3+/ fiber ring laser with short cavity

In this paper, a highly-doped Yb/sup 3+/ fiber ring laser with short cavity has been presented. Comparing with normal Yb/sup 3+/ doped fiber, the relationships between the important characteristics of the Yb/sup 3+/ doped fiber laser such as threshold power, output power and laser parameters such as pump power, fiber length, couple ratio are analyzed. Numerical results are coincident with the experiment phenomenon.