4-8 July 2016
Kramer Law building
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=10&confId=86">The Proceedings of SAIP2016</a> published on 24 December 2017

Development of a large mode area (LMA), high-power, thulium-doped fibre laser

5 Jul 2016, 10:00
20m
5C (Kramer Law building)

5C

Kramer Law building

UCT Middle Campus Cape Town
Oral Presentation Track C - Photonics Photonics

Speaker

Mr Daniel Morris (Council for Scientific and Industrial Research)

Main supervisor (name and email)<br>and his / her institution

Dr. Lorinda Wu, LWua@csir.co.za, Council for Scientific and Industrial Research (CSIR)

Level for award<br>&nbsp;(Hons, MSc, <br> &nbsp; PhD, N/A)?

MSc

Please indicate whether<br>this abstract may be<br>published online<br>(Yes / No)

Yes

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?

No

Apply to be<br> considered for a student <br> &nbsp; award (Yes / No)?

Yes

Abstract content <br> &nbsp; (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>

Thulium-doped fibre lasers are useful 2 micron sources that can be used for light detection and ranging (LIDAR), free space propagation of light, medical surgery and pumping of optical parametric oscillators (OPO). We investigated a high-power, large mode area (LMA), free space coupled, thulium-doped fibre laser which was pumped by 793 nm laser diodes. The fibre laser was characterized with regard to efficiency, beam quality, output power stability, and wavelength. Characterisation was also done with two intra-cavity volume Bragg gratings (VBG’s). We achieved more than 60 W of stable, continuous wave output from a 3.7 m long thulium-doped fibre with a near theoretical limit slope efficiency of 54%. This output was achieved at the free running output wavelength of 2014 nm. The beam profile had a measured beam quality factor (M2) of 1.85 at 60 W of average laser power.

Primary author

Mr Daniel Morris (Council for Scientific and Industrial Research)

Co-authors

Prof. Andrew Forbes (CSIR) Dr Lorinda Wu (CSIR-NLC) Dr Wayne Koen (CSIR National Laser Centre)

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