Starting Dynamics of a Fully Electronically Controlled Linear Mamyshev Oscillator

TL;DR

This paper demonstrates a stable, environmentally-friendly linear Mamyshev oscillator with electronic control, achieving ultrashort pulses and reliable startup conditions through modulation and innovative design features.

Contribution

It introduces a fully electronically controlled linear Mamyshev oscillator with a novel starting method and damage prevention measures, advancing practical ultrafast laser technology.

Findings

Achieved 65 fs pulses after compression

Reliable mode-locking starts at modulation frequencies above 70 kHz

Implemented Faraday rotators to prevent gain fiber damage

Abstract

We start an environmentally-stable linear Mamyshev oscillator with electronically-controlled modulated pump and a moving filter. It delivers a 21-nJ pulse that becomes 65 fs in duration after a compressor. Reliable starting into stable mode-locking is found achievable with a modulated mode-locked state observed only when the modulation frequency is larger than 70 kHz. To avoid the damage of the gain fiber, two Faraday rotators are introduced. Besides, we have studied several aspects toward obtaining successful starting.