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Title: Femtosecond Laser Plane-by-Plane Inscribed Cavity Mirrors for Monolithic Fiber Lasers in Thulium-Doped Fiber
Authors: Theodosiou, Antreas 
Aubrecht, Jan 
Kašík, Ivan 
Dousek, Daniel 
Komanec, Matěj 
Kalli, Kyriacos 
Major Field of Science: Engineering and Technology
Field Category: Electrical Engineering - Electronic Engineering - Information Engineering
Keywords: Femtosecond laser;Fiber Bragg gratings;Fiber lasers;Monolithic fiber lasers
Issue Date: 10-Mar-2021
Source: Sensors, 2021, vol. 21, no. 6, articl. no. 1928
Volume: 21
Issue: 6
Journal: Sensors 
Abstract: A monolithic fiber laser operating in the short wavelength infrared that is suitable for CO2 gas sensing applications is proposed and presented. The current study reports a laser design based on the direct inscription of a monolithic Fabry-Perot (FP) cavity in a thulium-doped optical fiber using the femtosecond laser (FsL) plane-by-plane inscription method to produce the cavity mirrors. The FP cavity was inscribed directly into the active fiber using two wavelength-identical fiber Bragg gratings (FBGs), one with high and one with low reflectivity. Initially the effective length of the fiber was defined using a single high reflectivity FBG and subsequently a very weak FBG was inscribed at the other end of the fiber in order to demonstrate a fully monolithic fiber laser. All fiber lasers were designed for continuous wave operation at 1950 nm and characterized with respect to the power output, slope efficiency, stability, and effective resonator length. The performance of the presented monolithic laser cavities was evaluated using the same active fiber as a reference fiber spliced to FBGs inscribed in passive fiber; an improvement exceeding 12% slope efficiency is reported for the presented monolithic laser.
ISSN: 1424-8220
DOI: 10.3390/s21061928
Rights: This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution
Attribution-NonCommercial-NoDerivatives 4.0 International
Type: Article
Affiliation : Lumoscribe LTD 
Cyprus University of Technology 
Czech Academy of Sciences 
Czech Technical University in Prague 
Appears in Collections:Άρθρα/Articles

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