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http://dx.doi.org/10.7736/KSPE.2014.31.9.805

A Simple Yb-Doped Mode-Locked Fiber Oscillator under Normal Dispersion as a Seed Laser  

Kim, Byeong Kwon (Department of Photonic Engineering, Chosun University)
Joo, Ki-Nam (Department of Photonic Engineering, Chosun University)
Publication Information
Journal of the Korean Society for Precision Engineering / v.31, no.9, 2014 , pp. 805-811 More about this Journal
Abstract
In this investigation, we constructed and demonstrated a simple Yb-doped fiber laser, of which longitudinal modes are mode-locked without any additional devices to compensate the dispersion caused by optical components. Non-linear polarization rotation (NPR) was adopted for the mode-locking mechanism and a polarization controller (PC) was used for a kind of spectral filters to restrict the bandwidth for mode-locking. As the result, the laser was successfully operated as mode-locked with the repetition rate of 42.2 MHz and the spectrum was broadened up to approximately 16 nm at 1033 nm center wavelength when the laser was mode-locked. In this paper, the operation of the developed Yb-doped mode-locked laser is explained with the concept of Lyot filter realized by a PC, which enables mode-locking under normal dispersion. In the industrial applications, this laser can be used as a seed laser of the high power lasers for optical manufacturing.
Keywords
Yb-Doped Fiber Laser; Mode-Locking; Polarization Control; Normal Dispersion; Lyot Filter;
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