Open AccessGeneration of femtoseond Ti:sapphire laser at 10MHz repetition rate by extending laser cavity with a telescope
Author(s) -
Zhao Yang-Ying,
Hainian Han,
Teng Hao,
Zhiyi Wei
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.1709
Subject(s) - laser , optics , pulse duration , femtosecond , materials science , pulse (music) , femtosecond pulse shaping , sapphire , group delay dispersion , chirped pulse amplification , telescope , physics , fiber optic sensor , detector , optical fiber , dispersion shifted fiber
We demonstrated a femtosecond Ti:sapphire oscillator at 10?MHz repetition rate by introducing a specially designed multi-pass telescope to increase the cavity length. Stable mode locking laser with average power of 200 mW is obtained under 532?nm laser pump of 5?W power, corresponding to a single pulse energy of 20?nJ. Based on this laser, we further explored the characteristics of pulse duration and spectrum with the net intracavity group-delay dispersion GDD. The result indicates that the near-bandwidth-limited pulse can be obtained when a little net negative GDD exists, the optimized pulse duration as short as 56?fs was generated in this case. The positive GDD will lead to a widened pulse with the increase of positive GDD, and the pulse duration can extend to more than 600?fs with the largest allowable positive GDD.