14.5 GHz passive harmonic mode-locking in a dispersion compensated Tm-doped fiber laser

Abstract

We demonstrate a high repetition rate passive harmonic mode-locking (HML) based on nonlinear polarization evolution (NPE) technique in a Tm-doped ring fiber laser cavity. Small net anomalous cavity dispersion based on dispersion compensation benefited the generation of high repetition rate HML due to the low soliton splitting threshold. Stable HML with a repetition rate of up to 14.5 GHz and a super-mode suppression (SSR) of 19 dB was obtained at the center wavelength of 1982.3 nm, which is about ten times of state of the art at 2 μm band mode-locking fiber laser to our best knowledge. The repetition rate was selectable between 1 GHz to 14.5 GHz through changing the pump power and intra-cavity polarization state, and the SSR better than 25 dB was obtained as the repetition rate less than 5 GHz.

β-In2S3 Nanoplates for Ultrafast Photonics

“…It is well known that a high nonlinear effect and a low dispersion are conducive to the generation of high-order harmonic pulses . According to ref , the net cavity dispersion of the resonator increases from −2.5 to −0.06 ps 2 , and the repetition frequency of the resonator increases first and then decreases. The repetition frequency is up to 10 GHz, and the corresponding dispersion is 0.22 ps 2 .…”

Numerical investigation of GHz repetition rate fundamentally mode-locked all-fiber lasers

“…% has been achieved without concentration quenching effects [35]. GHz repetition rate pulses can also be obtained from harmonic mode-locking of a long-cavity fiber laser with a fundamental repetition rate of MHz [36][37][38][39], in which multiple pulses are formed within a round trip due to the nonlinear effects [37]. Most recently, a modelocked fiber laser operating at the 3436 th harmonic of the fundamental repetition rate was developed and pulses with a repetition rate of 14.5GHz were obtained [38].…”

“…GHz repetition rate pulses can also be obtained from harmonic mode-locking of a long-cavity fiber laser with a fundamental repetition rate of MHz [36][37][38][39], in which multiple pulses are formed within a round trip due to the nonlinear effects [37]. Most recently, a modelocked fiber laser operating at the 3436 th harmonic of the fundamental repetition rate was developed and pulses with a repetition rate of 14.5GHz were obtained [38]. Harmonic modelocked fiber lasers with tunable repetition rate at GHz ranges have also been achieved with four-wave mixing mechanism and different frequency multiplication techniques [19][20][21][22].…”

L-Band GHz Femtosecond Passively Harmonic Mode-Locked Er-Doped Fiber Laser Based on Nonlinear Polarization Rotation

“…The output pulse duration is 20.67 ps, and the TBP is 9.79 which indicating heavy chirp [15]. Very recently, a 14.5 GHz PHML in a dispersion compensated Tm-doped fiber laser has been demonstrated by Wang et al [16]. However, an all-fiber L-band PHML laser based on NPR has never been demonstrated.…”