Multielement (P‐Yb‐Zr‐Ce‐Al‐Ca) fiber for moderate‐power laser application with enhanced photodarkening resistivity

Abstract

Multielement (ME) (P-Yb-Zr-Ce-Al-Ca) nanophase separated silica-glass-based optical fiber is fabricated through a conventional-modified chemical vapor deposition (MCVD) process, coupled with solution doping technique. The lasing and photodarkening behaviors of this ME fiber have been demonstrated and compared, in terms of its photodarkening (PD) performance at moderate pump powers (tens of Watts), with standard Yb-doped fiber with phospho-alumino-silicate (PAS) glass composition, which clearly reveals that the ME-Yb doped fiber is a promising candidate for laser applications with enhanced PD resistivity.

Luminescent Properties and Optical Amplification of Erbium‐Doped Nano‐Engineered Scandium‐Phospho‐Yttria‐Alumina‐Silica Glass Based Optical Fiber

“…The fabrication of Er doped nano‐engineered glass based optical fiber based on the incorporation of Al 2 O 3 , Y 2 O 3 , and Sc 2 O 3 into silica glass made to reduce RE clustering compared to pure silica glass along with improving fiber's spectroscopic properties. Insulation of REs ions from matrix vibrations is essential by appropriate material design of the surrounding ion site through the formation of phase‐separated NPs . This involves encapsulation of dopants inside glassy or crystalline NPs, embedded in the fiber glass.…”

“…Insulation of REs ions from matrix vibrations is essential by appropriate material design of the surrounding ion site through the formation of phase-separated NPs. [10,11,[19][20][21] This involves encapsulation of dopants inside glassy or crystalline NPs, embedded in the fiber glass. The selection of different components of the present glass is discussed in details in the experimental section.…”

“…The glass formers, SiO 2 and P 2 O 5 , were incorporated in the core matrix of the optical fiber preform through the MCVD process, where P 2 O 5 served as a nucleating agent that facilitates phase separation and assists generation of Er‐enriched nano‐crystallites . Selection of Sc 2 O 3 and Y 2 O 3 allows enhancing radiative transitions between electronic levels of RE's ions due to their low phonon energy compared to silica.…”

“…The glass formers, SiO 2 and P 2 O 5 , were incorporated in the core matrix of the optical fiber preform through the MCVD process, where P 2 O 5 served as a nucleating agent that facilitates phase separation [10,11] and assists generation of Er-enriched nano-crystallites. [21,27] served to slow down or stop the changes in the formation of larger sized crystallites and, eventually, preserve the mechanical strength and integrity of the preform and final fiber.…”

“…This new technique has attracted a lot of interest as it provide the formation of embedded phase-separated nanoparticles with crystalline or amorphous nature into REdoped SiO 2 host-matrix to enhance their spectroscopic performance and promises for high-power optical amplifiers, modelocked, and Q-switched fiber lasers, and broadband SC sources. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] In this paper, we are, for the first time to report on the formation of Er doped nano-engineered Scandium-Phospho-Yttria-Alumina-Silica (SPYAS) glass based optical fiber using the MCVD process, coupled with solution doping technique followed by thermal annealing of the original preform. Scandium oxide used as one of the sesquioxides is a cubic crystal belonging to the Ia3 space group (space group number 206).…”