Generation of burst pulses through multimodal interference in a passively mode-locked ytterbium fibre-ring laser

We present a passively mode-locked all-fibre ring laser, working in the near-infrared region. The burst of multiple pulses generation is achieved by modifying the transmission output of the saturable absorber. Consequently, multiple modes are stimulated within the laser cavity and multiple wavelengths of operation from 1038 to 1082 nm are accomplished. Furthermore, average power and pulse energy, up to 3.48 mW and 42.9 nJ, are measured and validated. The laser exhibits high-power and wavelength stability at room temperature. In addition, the Raman effect is detected by increasing the power of the pump and up to three stokes are reached; therefore, a broadband spectrum of 140 nm is observed by changing the state of polarization within the cavity. (letter)