Investigation on the self-starting Mamyshev oscillator with low threshold

TL;DR

This paper demonstrates a low-threshold, self-starting Mamyshev oscillator using a single-mode fiber, achieving ultra-short pulse generation with high peak power and investigating the effects of spectral filters and pump power.

Contribution

It introduces a low-threshold, self-starting Mamyshev oscillator with optimized spectral and polarization conditions, enabling efficient ultra-short pulse generation.

Findings

Self-starting mode-locking achieved at 520 mW pump power.

Generated pulses with 1.89 nJ energy and 54.6 nm spectral width.

External compression reduced pulse duration to 64.69 fs.

Abstract

We have demonstrated a mode-locked Mamyshev oscillator based on a single-mode-fibre configuration with low threshould. The influences of spectral filters and the pump power on the output laser characteristics have been investigated. In the case with spectral-filter central wavelength far away from the peak of gain spectrum, the laser pulses have deviated slightly from similariton evolution with gain-shaping under high pump power. Moreover, self-starting mode-locking operation has been realized when the pump power was only 520 mW, which might benefit from the appropriate polarization conditions and small spectral filter separation. The laser can generate 1.89-nJ ultra-short pulses with 20-dB spectral width of 54.6 nm. The pulse duration can be compressed externally to 64.69 fs with the peak power of 21.3 kW.