Baltiska, A.

Fernández, A.

Grüner-Nielsen, L.

Israelsen, Stine Møller

Verhoef, A. J.

Zhu, L.

Online Research Database In Technology

                       General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.  • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal   If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.     Downloaded from orbit.dtu.dk on: Dec 20, 2017Self-starting all-polarization maintaining Yb-fiber laser with a polarization maintaininganomalous dispersion higher-order-mode fiberZhu, L.; Verhoef, A. J.; Grüner-Nielsen, L.; Israelsen, Stine Møller; Baltiska, A.; Fernández, A.Publication date:2014Document VersionPublisher's PDF, also known as Version of recordLink back to DTU OrbitCitation (APA):Zhu, L., Verhoef, A. J., Grüner-Nielsen, L., Israelsen, S. M., Baltiska, A., & Fernández, A. (2014). Self-startingall-polarization maintaining Yb-fiber laser with a polarization maintaining anomalous dispersion higher-order-mode fiber. Abstract from 6th EPS-QEOD EUROPHOTON CONFERENCE, Neuchatel, Switzerland.   Self-­starting	  all-­polarization	  maintaining	  Yb-­fiber	  laser	  with	  a	  polarization	  maintaining	  anomalous	  dispersion	  higher-­order-­mode	  fiber	  	  L. Zhu,1,2 A.J. Verhoef,1 L. Grüner-Nielsen,3 S. Møller Israelsen,4 A. Baltuška,1 and A. Fernández1 1 Institut für Photonik, Technische Universität Wien, Gusshausstrasse 27-29/387, A-1040 Wien, Austria. 2Universität Wien, Institut für Physikalische Chemie, Währinger Straße 42, 1090 Vienna, Austria 3OFS Denmark, Priorparken 680, 2605 Brøndby, Denmark. 4 Technical University of Denmark, Department of Photonics Engineering, DK - 2800 Kgs. Lyngby, Denmark.  All-integrated modelocked Yb-fiber lasers are very attractive for a wide range of potential applications, including micromachining, spectroscopy, metrology, nonlinear imaging and several clinical applications. The adoption of these lasers beyond laboratory environments is hindered because of the sensitivity of modelocking operation against external perturbations. In non-polarization maintaining (non-PM) fibers, temperature changes, fiber bending and other mechanical perturbations, can influence the birefringence properties of the fibers which can result in degradation of device performance and eventually losing of   modelocking. Since environmental instabilities in fiber lasers mainly arise from induced changes in the birefringence of non-PM fibers, the straightforward approach to make the laser robust against them is to use PM fibers with light polarized only along the slow axis [1,2]. A major challenge to develop operational and environmentally stable fiber lasers delivering high fidelity femtosecond pulses at 1 µm wavelength is to realize good higher order dispersion compensation and to manage intracavity nonlinearities. Previously we have demonstrated a high-fidelity oscillator in which dispersion compensation was realized with a higher order mode fiber (HOM) [3], but this scheme was based on non-PM fibers. Several environmentally stable Yb-fiber oscillators using PM fibers and different approaches for dispersion compensation has been realized. Such approaches include using bulk gratings [1], chirped PM-fiber Bragg gratings [4], solid core PM-photonic crystal fibers [5]. Recently the realization of a PM-higher order mode fiber (HOMF) was demonstrated [6]. The use of a HOMF has key advantages over the other approaches. It allows for smooth intracavity compensation including higher order dispersion without introducing severe nonlinearities in the system. Additionally, integration of solid silica-based HOMF is possible using standard fusion splicing techniques. In this contribution we demonstrate a semiconductor saturable absorber mirror (SESAM) modelocked all-polarization maintaining femtosecond fiber laser where for the first time a PM-HOMF has been used for intracavity dispersion compensation. The layout of the oscillator ring cavity is shown in Fig. 1 (left). The mode-locking mechanism is based on a SESAM. The gain medium was a 40 cm long highly Yb-doped PM fiber (Yb-401 PM from Coractive). The oscillator repetition rate is 10 MHz. The total cavity dispersion is slightly anomalous and the oscillator operates in the weak stretched pulse regime. It delivers 1.2 nJ pulses that can be externally recompressed down to 150 fs. The output spectrum and corresponding pulse are shown in Fig. 1 (center) and (right), respectively. For our proof-of-principle setup we have made use of a configuration including free space components but straightforward realization of an all PM-fiber integrated system is possible with commercially available PM fiber based components.    Fig. 1 (left) Oscilltor schematic, (center) output spectrum and (right) corresponding pulse shape.	  References [1] C. K. Nielsen et al., Opt. Express, 13, 9346 (2005). [2] X. Liu, J. Lægsgaard and D. Turchinovich, IEEE J. Sel. Topics Quantum Electron., 18, 1439 (2012). [3] L. Zhu et al., Opt. Express 21, 16255 (2013). [4] I. Hartl, et al., ”Ultra-compact dispersion compensated femtosecond fiber oscillators and amplifiers,” CLEO 2005, paper CThG1, (2005). [5] X. Liu, J. Lægsgaard, and D. Turchinovich, Opt. Express 18, 15475 (2010). [6] S.H.M. Larsen et al., Opt. Lett. 37, 4170 (2012). 

Self-starting all-polarization maintaining Yb-fiber laser with a polarization maintaining anomalous dispersion higher-order-mode fiber

http://orbit.dtu.dk/ws/files/100327710/x_abstract_0162_submitter_0149_Verhoef_Aart.pdf

Self-starting all-polarization maintaining Yb-fiber laser with a polarization maintaining anomalous dispersion higher-order-mode fiber

Abstract

Similar works

Full text

Available Versions

Online Research Database In Technology