Mitigation of stimulated Raman scattering in high power fiber lasers using transmission gratings

被引：12

作者：

Heck, Maximilian ^{[1
]}

Bock, Victor ^{[2
]}

Kraemer, Ria G. ^{[1
]}

Richter, Daniel ^{[1
]}

Goebel, Thorsten A. ^{[1
]}

Matzdorf, Christian ^{[1
]}

Liem, Andreas ^{[2
]}

Schreiber, Thomas ^{[2
]}

Tuennermann, Andreas ^{[1
,2
]}

Nolte, Stefan ^{[1
,2
]}

机构：

[1] Friedrich Schiller Univ Jena, Abbe Ctr Photon, Inst Appl Phys, Albert Einstein Str 15, D-07745 Jena, Germany

[2] Fraunhofer Inst Appl Opt & Precis Engn, Albert Einstein Str 7, D-07745 Jena, Germany

来源：

FIBER LASERS XV: TECHNOLOGY AND SYSTEMS | 2018年 / 10512卷

关键词：

Stimulated Raman scattering; long period fiber gratings; high power fiber laser; large mode area fibers; fiber optical devices; optical filter; ultrafast processes in condensed matter; SUPPRESSION; AMPLIFIER;

D O I：

10.1117/12.2289511

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The average output power of fiber lasers have been scaled deep into the kW regime within the recent years. However a further scaling is limited due to nonlinear effects like stimulated Raman scattering (SRS). Using the special characteristics of femtosecond laser pulse written transmission fiber gratings, it is possible to realize a notch filter that mitigates efficiently this negative effect by coupling the Raman wavelength from the core into the cladding of the fiber. To the best of our knowledge, we realized for the first time highly efficient gratings in large mode area (LMA) fibers with cladding diameters up to 400 nm. The resonances show strong attenuation at design wavelength and simultaneously low out of band losses. A high power fiber amplifier with an implemented passive fiber grating is shown and its performance is carefully investigated.

引用

页数：8

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