Detailed spectrum broadening mechanisms in supercontinuum (SC) generation are studied with an all-fiber pulsed laser source and a highly nonlinear dispersion-shifted fiber (HN-DSF). Mode-locked fiber laser pulses are stretched to four different pulse widths, and SC spectra are measured with different propagation distances with these pulses. By observing the development of spectral width with distance, we have observed that self-phase modulation (SPM) rather than soliton fission is the dominant process at the beginning of SC generation in our case. We have also confirmed that four-wave mixing (FWM) and its walk-off problem associated with different spectral components are the major limiting factors in efficient wide-band SC generation.
|Number of pages||12|
|Journal||Journal of Nonlinear Optical Physics and Materials|
|Publication status||Published - 2009 Mar|
Bibliographical noteFunding Information:
This research was supported by Creative Research Initiatives (3D Nano Optical Imaging Systems Research Group) of MOST/KOSEF.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Physics and Astronomy (miscellaneous)