High-power all-fiber ultra-low noise laser

TL;DR

This paper demonstrates a high-power, ultra-low noise all-fiber laser at 100 W with significant noise reduction capabilities, suitable for interferometric metrology applications.

Contribution

It introduces a robust, linearly-polarized all-fiber laser with optimized noise control and high feedback bandwidth, advancing laser technology for precision measurements.

Findings

Achieved 100 W output power in an all-fiber laser

Reduced relative intensity noise to -160 dBc/Hz between 3 kHz and 20 kHz

Implemented high-bandwidth feedback control for noise suppression

Abstract

High-power ultra-low noise single-mode single-frequency lasers are in great demand for interferometric metrology. Robust, compact all-fiber lasers represent one of the most promising technologies to replace the current laser sources in use based on injection-locked ring resonators or multi-stage solid-state amplifiers. Here, a linearly-polarized high-power ultra-low noise all-fiber laser is demonstrated at a power level of 100 W. Special care has been taken in the study of relative intensity noise (RIN) and its reduction. Using an optimized servo actuator to directly control the driving current of the pump laser diode (LD), we obtain a large feedback bandwidth of up to 1.3 MHz. The RIN reaches-160 dBc/Hz between 3 kHz and 20 kHz.