120-fs single-pulse generation from stretched-pulse fiber Kerr resonators

TL;DR

This paper demonstrates the generation of stable 120-fs single pulses from fiber Kerr resonators using stretched-pulse solitons, advancing ultrashort pulse production for practical applications.

Contribution

It introduces a method to achieve robust, single 120-fs pulses in fiber Kerr resonators by optimizing cavity length and drive conditions, addressing previous limitations.

Findings

Stable 120-fs pulses achieved experimentally.

Optimal cavity length depends on drive, Raman scattering, and pulse stretching.

Single-pulse trapping demonstrated with pulsed drive source.

Abstract

Fiber Kerr resonators are simple driven resonators with desirable wavelength and repetition rate flexibility for generating ultrashort pulses for applications including telecommunications, biomedicine, and materials processing. However, fiber Kerr resonators to date often generate longer pulses and require more complicated techniques for generating single pulses than would be desirable for applications. Here we address these limits by demonstrating robust single-pulse performance with 120-fs pulse durations in fiber Kerr resonators based on stretched-pulse solitons. Through matching numerical and experimental studies, stretched-pulse soliton performance is found to strongly depend on the total cavity length, and the optimum length is found to depend on the drive, Raman scattering, and the total pulse stretching. By designing the cavity for this optimum with the described setup, stable stretched-pulse solitons with 120-fs duration are experimentally observed. In addition, soliton trapping is demonstrated with a pulsed drive source despite large intracavity breathing and single-pulse performance is observed. Robust with high performance single-pulse generation is a critical step toward useful femtosecond pulse generation.