Relative Carrier-Envelope-Offset Frequency Locking between Ultrafast Two-Color Fiber Laser Systems by Feed-Forward Method

• Main Authors: Bo-Jyun Fong, 馮柏鈞
• Other Authors: Wei-Wei Hsiang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/71951547407122969401

碩士 === 輔仁大學 === 物理學系碩士班 === 102 === In this thesis, we investigate the possible method to lock the relative carrier-envelope-offset (CEO) frequency of the ultrafast two-color fiber laser system with a synchronized pulse repetition frequency. First of all, the locking of the pulse repetition frequencies is achieved by the hybrid synchronization technique. After achieving the synchronization, the relative CEO frequency is obtained from the beat notes between the output of the Yb-fiber laser system and the supercontinuum (SC) generated by the Er-fiber laser system. We use the feed-forward method based on an acousto-optic frequency shifter (AOFS) to lock the relative CEO frequency at zero or a fixed frequency. When the relative CEO frequency is locked to zero, interference fringes between the SC of the Er-fiber laser system and the Yr-fiber laser output diffracted by the AOFS can be observed obviously in the optical spectrum near 1 μm. This means not only the CEO frequency but the CEO phase is stabilized.