Change search
ReferencesLink to record
Permanent link

Direct link
Pulse selection at 1 MHz with electrooptic fiber switch
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.ORCID iD: 0000-0003-3933-4406
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
2012 (English)In: Optics Express, ISSN 1094-4087, Vol. 20, no 9, 9465-9470 p.Article in journal (Refereed) Published
Abstract [en]

Two 78-cm long electrooptic fibers with nonlinear coefficient. chi((2)) similar to 0.26 pm/V are used in a Sagnac loop for pulse selection at up to 1 MHz repetition rate. Laser pulses of 1.5 mu m wavelength arriving at every 140 ns are selected with an extinction ratio as high as -30 dB. The arrangement is entirely based on silica fiber.

Place, publisher, year, edition, pages
2012. Vol. 20, no 9, 9465-9470 p.
Keyword [en]
Modulation, Microstructured fibers
National Category
Atom and Molecular Physics and Optics
URN: urn:nbn:se:kth:diva-93691DOI: 10.1364/OE.20.009465ISI: 000303989300015ScopusID: 2-s2.0-84861117821OAI: diva2:517461
Swedish Research CouncilKnut and Alice Wallenberg Foundation
QC 20120612Available from: 2012-04-23 Created: 2012-04-23 Last updated: 2012-11-29Bibliographically approved
In thesis
1. All-fiber modulators for laser applications
Open this publication in new window or tab >>All-fiber modulators for laser applications
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The objective of this thesis was to explore the usefulness of all-fiber modulators for laser applications. The modulators were all based on refractive index change achieved in the core of the studied fiber- components, exploiting either the elasto-optic effect or the electro-optic effect. This was realized with the aid of electrodes inside the fiber cladding close to the core that provided either thermal stress in the core, or an electric field across the core. The electrodes consisted of low melting-point alloys, such as BiSn and AuSn, which were pushed into the hole-fiber, in the liquid state, which then solidified to form solid electrodes filling the entire hole.

Together with an analyzer such as a polarizer or an interferometer the achieved refractive index modulation in the core could then be translated into an amplitude modulation of the guided light, which was subsequently utilized for switching fiber-lasers to generate cavity dumped, Q-switched, or mode-locked pulses. The fast rise/fall-time of a few nanoseconds for the elasto-optic devices was due to the fast thermal expansion of the electrodes. The maximum repetition rate, however, was limited to a few tens of kHz, due to the slow thermal processes for dissipation of the applied energy. The electro-optic fiber components, which displayed similar rise/fall-times on the other hand, showed a much higher cut-off frequency of 16 MHz.

The electro-optic, all-fiber switch was also employed to select single pulses at 1 MHz repetition rate out of a 7 MHz train of pulses. Additionally, simulations using the finite element method were performed in order to gain insight and to explain the underlying processes of the observed response of a long-period grating written in a 2-hole fiber with electrodes, when applying HV-pulses to one of these.

The thesis shows that the studied fiber-components show great potential of becoming complementary devices with high damage threshold for all-fiber laser applications in the future. 

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. vii, 77 p.
Trita-FYS, ISSN 0280-316X ; 2012:86
All-fiber, fiber optics, modulation, q-switching, mode-locking
National Category
Atom and Molecular Physics and Optics
urn:nbn:se:kth:diva-105863 (URN)978-91-7501-574-3 (ISBN)
Public defence
2012-12-18, FD5, Albanova, Roslagstullsbacken 21, Stockholm, 10:00 (English)

QC 20121129

Available from: 2012-11-29 Created: 2012-11-28 Last updated: 2015-03-30Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Malmström, MikaelMargulis, Walter
By organisation
Laser Physics
In the same journal
Optics Express
Atom and Molecular Physics and Optics

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 64 hits
ReferencesLink to record
Permanent link

Direct link