Characteristics of three operation schemes in a passively mode-locked all fiber ring laser

Chunmei Ouyang; Lu Chai; Minglie Hu; Youjian Song; Chingyue Wang

doi:10.1117/12.754840

6 February 2008 Characteristics of three operation schemes in a passively mode-locked all fiber ring laser

Chunmei Ouyang, Lu Chai, Minglie Hu, Youjian Song, Chingyue Wang

Proceedings Volume 6823, High-Power Lasers and Applications IV; 68230X (2008) https://doi.org/10.1117/12.754840
Event: Photonics Asia 2007, 2007, Beijing, China

Abstract

We demonstrate a passively mode-locked all fiber ring laser based on all-solid Yb-doped Photonic Bandgap fiber (AS-Yb- PBGF) which is designed to simultaneously provide laser gain and anomalous dispersion. The laser is comprised of 0.42m AS-Yb-PBGF and a segment of single mode fiber (SMF). By varying the length of the SMF from 0.8m to 3.2m, three operation schemes, namely soliton operation, gain-guided soliton operation, and self-similarity operation, have been obtained by means of numerical simulations in split-step Fourier method in the ring laser. In the case of net anomalous cavity group-velocity dispersion (GVD) when the SMF is 0.8m, we obtain soliton pulse with the balance between the nonlinear self-phase modulation (SPM) and the anomalous GVD. The soliton pulse has the pulse duration of 355fs and the bandwidth of 1.9nm, corresponding to the time-bandwidth product of 0.33, nearly a transform-limited pulse. As the length of the SMF is changed to 2m, self-similar propagation is generated with the net cavity GVD of +0.014ps². The pulse has strong frequency chirp and high pulse energy up to 4nJ. The pulse duration is 2.5ps with the bandwidth of 2.1THz. To obtain gain-guided soliton, we change the SMF to 3.2m leading to a large net positive cavity GVD of +0.04 ps² and enforce the spectral limit of the gain fiber. A chirped gain-guided soliton pulse is observed with pulse energy of ~1nJ, the pulse duration of 2.5ps and the bandwidth of 2.5 THz.

Citation Download Citation

Chunmei Ouyang, Lu Chai, Minglie Hu, Youjian Song, and Chingyue Wang "Characteristics of three operation schemes in a passively mode-locked all fiber ring laser", Proc. SPIE 6823, High-Power Lasers and Applications IV, 68230X (6 February 2008); https://doi.org/10.1117/12.754840

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