Laser Dynamics of Asynchronous Harmonic Mode-Locked Yb-Doped Fiber Laser

• Main Authors: Wang, Sheng-Min, 王聖閔
• Other Authors: La,i Yin-chieh
• Format: Others
• Language: en_US
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/06035176795275598821

碩士 === 國立交通大學 === 光電工程學系 === 99 === Asynchronous Harmonic Mode-Locked Ytterbium Doped Fiber Lasers have many characteristics which are of great application potentials in the fields of long-distance optical communication, bio-photonics and ultrafast optics. These advantages include higher super-mode suppression ratios and the capability of generating ultrahigh repetition rate and ultra-short pulse trains. In this thesis, we demonstrate for the first time an asynchronous harmonic mode-locked ytterbium doped fiber laser with the hybrid mode-locking technique. This is the first observation of the asynchronous harmonic mode-locking in a normal dispersion fiber cavity. The deviation frequency of the laser is 94 kHz and the super-mode suppression ratio is around 60 dB at the 10 GHz asynchronous harmonic mode-locked state. The super-mode suppression ratio increases around 40 dB than the ordinary harmonic mode-locked state. The output power is around 20 mW operating at 1050 nm, a useful wavelength in many applications including bio-photonics.