Single-frequency Er³⁺ doped phosphate fiber MOPA

verfasst von

Phillip Booker, Marian Dürbeck, Nadia G. Boetti, Diego Pugliese, Silvio Abrate, Daniel Milanese, Michael Steinke, Jörg Neumann, Dietmar Kracht

Abstract

Single-frequency Er³⁺ doped fiber amplifiers in MOPA configuration are promising candidates to fulfil the challenging requirements of laser sources at 1.5 μm for the third generation of interferometrie gravitational wave detectors (GWDs) [1]. An all-fiber design ensures excellent beam quality, stability and reliability compared to bulk concepts. However, in monolithic systems high power operation gives rise to non-linear effects such as stimulated Brillouin scattering (SBS), which eventually limit the output capacity of such fiber MOPAs [2]. Since the threshold power for SBS scales inversely with the length and cross-section of the fiber, researchers placed much attention to enhance the Er³⁺ doping levels and therefore decrease necessary fiber length for sufficient signal amplification. However, already at moderately low doping concentrations Er³⁺ ions tend to form clusters in industry-standard fused silica fibers. Consequently, the short intra-cluster distances between adjacent Er³⁺ ions introduce quenching effects in terms of homogenous up-conversion processes (I_13/2 + I_13/2 → I_9/2 + I_15/2). Thus, high inversion levels can reduce the pump-to-signal energy conversion efficiency and amplifier's output capacity since ions in the I_9/2 state relax non-radiatively.

Externe Organisation(en)

Laser Zentrum Hannover e.V. (LZH)
Fondazione LINKS
Politecnico di Torino (POLITO)

Typ

Aufsatz in Konferenzband

Publikationsdatum

2019

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Spektroskopie, Elektronische, optische und magnetische Materialien, Instrumentierung, Atom- und Molekularphysik sowie Optik, Computernetzwerke und -kommunikation

Elektronische Version(en)

https://doi.org/10.1109/cleoe-eqec.2019.8871636 (Zugang: Geschlossen)