NDLI: Spectral broadening and power leakage in CW Yb-doped fibre laser

Content Provider	IEEE Xplore Digital Library
Author	Latkin, A.I. Kurkov, A.S. Turitsyn, S.K.
Copyright Year	2009
Description	Author affiliation: Novosibirsk State University, Pirogova st. 2, 630090, Russia (Latkin, A.I.) \|\| School of Engineering and Applied Science, Aston University, Birmingham B4 7ET, UK (Turitsyn, S.K.) \|\| General Physics Institute, Vavilov st. 38, 119333, Moscow, Russia (Kurkov, A.S.)
Abstract	Spectral broadening of the fibre laser emission can degrade system efficiency, complicate frequency doubling and is a non-desirable effect in many applications. On the other hand, effect of the spectral broadening lies in a very background of the operation of supercontinuum laser sources. Therefore, study of this nonlinear physical phenomenon is both an interesting fundamental and practical engineering problem relevant to laser performance. Spectral broadening of powerful laser radiation might lead to large changes of the emission characteristics during one round trip, breaking assumption that is typically used in the classical laser models (see e.g. [1]). In this work we study experimentally and theoretically spectral broadening of radiation in CW Yb-doped fibre laser. Averaged models dealing with an average optical power and neglecting the phase of optical field and time dynamics of the radiation are commonly used for analysis of CW fibre lasers (see e.g. [2] and references therein). However, time evolution of the optical radiation might play an important role in performance of high power fibre laser even for so-called CW lasers. In this work we undertake experimental and numerical study of spectral broadening of radiation in fibre laser operating at 1084nm. Experimental setup is shown in Fig. 1(left): 35 meter Yb-doped fibre (GTWave) with 7µm core was pumped with 910 nm laser diode at up to 23W output power. Laser operates in CW regime with maximal output power of 12W. The FBG (HR2) at the left end of the cavity has maximum reflectivity at 1084nm and spectral width of ∼1nm. At the other end, cavity was formed by the 4% back reflection from the fibre edge. A fraction of power leaves the cavity through leakage around HR2 FBG, Fig. 1 (right). This effect can be quantitatively treated as an effective “decrease of the FBGs reflectivities”.
Starting Page	1
Ending Page	1
File Size	943788
Page Count	1
File Format	PDF
ISBN	9781424440795
DOI	10.1109/CLEOE-EQEC.2009.5192860
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-14
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Reflectivity Laser theory Particle beam optics Power lasers Laser modes Fiber nonlinear optics Optical harmonic generation Optical pumping Pump lasers Fiber lasers
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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