The University of Southampton
University of Southampton Institutional Repository

High-power diode-pumped solid-state 2 micron lasers

High-power diode-pumped solid-state 2 micron lasers
High-power diode-pumped solid-state 2 micron lasers
Brightness scaling of diode-bar end-pumped solid-state lasers producing efficient output radiation in the 2µm wavelength region is investigated. Problems and strategies for power scaling diode-bar end-pumped lasers in the 2µm region are also discussed.
Thermal lens measurements on Tm3+:YAG and Tm3+:(Lu,Y)AG were made. Thermal lens dependency on resonator loss is observed and attributed to heating from upconversion.
High-power room temperature diode-bar end-pumped Tm3+:(Lu,Y)AG were developed. Efficient high power operation of the Tm3+:YAG laser producing 14.2W of output power at 2.013µm for 53.4W of incident pump power is demonstrated with M(2) values of 1.3 in orthogonal planes. The laser was then linearly polarised and compared with a similar laser using a scheme to compensate for the loss caused by thermally induced de-polarisation. Before the de-polarisation loss prevented lasing operation an output power of 8.4W was observed. Using the compensation scheme, the laser produced 11.5W of output power and was limited by pump power. The uncompensated de-polarisation loss was >5% reducing to <0.4% for the compensated laser.
A high power Tm3+:(Lu,Y)AG laser producing 18W of output power at 2.022µm was demonstrated and compared with a Tm3+:YAG laser.
High-power intracavity pumped Ho3+:YAG lasers were developed. A collinearly intracavity pumped Ho3+:YAG laser producing 8.4W of output power is demonstrated though application of the brightness scaling strategy was difficult to implement. A non-collinearly intracavity pumped laser showing 1.6W of output power is reported but showed alignment instability and was hard to replicate. Intracavity pumping schemes are discussed.
A Tm3+:silica fibre laser produced 14.2W of output at 1.98µm for 38.3W of launched pump power with a slope efficiency of ~36%. This was the highest reported power from a Tm3+:silica fibre laser to the author's knowledge. A tunable Tm3+ fibre laser showed > 1.8W output power across a tuned wavelength range of 1870-2030 nm.
Hayward, R.A.
75d8a6ac-ff53-44a9-b2b5-21617a2d73a7
Hayward, R.A.
75d8a6ac-ff53-44a9-b2b5-21617a2d73a7
Hanna, David
3da5a5b4-71c2-4441-bb67-21f0d28a187d
Clarkson, William
3b060f63-a303-4fa5-ad50-95f166df1ba2

(2003) High-power diode-pumped solid-state 2 micron lasers. University of Southampton, Optoelectronic Research Centre, Doctoral Thesis, 162pp.

Record type: Thesis (Doctoral)

Abstract

Brightness scaling of diode-bar end-pumped solid-state lasers producing efficient output radiation in the 2µm wavelength region is investigated. Problems and strategies for power scaling diode-bar end-pumped lasers in the 2µm region are also discussed.
Thermal lens measurements on Tm3+:YAG and Tm3+:(Lu,Y)AG were made. Thermal lens dependency on resonator loss is observed and attributed to heating from upconversion.
High-power room temperature diode-bar end-pumped Tm3+:(Lu,Y)AG were developed. Efficient high power operation of the Tm3+:YAG laser producing 14.2W of output power at 2.013µm for 53.4W of incident pump power is demonstrated with M(2) values of 1.3 in orthogonal planes. The laser was then linearly polarised and compared with a similar laser using a scheme to compensate for the loss caused by thermally induced de-polarisation. Before the de-polarisation loss prevented lasing operation an output power of 8.4W was observed. Using the compensation scheme, the laser produced 11.5W of output power and was limited by pump power. The uncompensated de-polarisation loss was >5% reducing to <0.4% for the compensated laser.
A high power Tm3+:(Lu,Y)AG laser producing 18W of output power at 2.022µm was demonstrated and compared with a Tm3+:YAG laser.
High-power intracavity pumped Ho3+:YAG lasers were developed. A collinearly intracavity pumped Ho3+:YAG laser producing 8.4W of output power is demonstrated though application of the brightness scaling strategy was difficult to implement. A non-collinearly intracavity pumped laser showing 1.6W of output power is reported but showed alignment instability and was hard to replicate. Intracavity pumping schemes are discussed.
A Tm3+:silica fibre laser produced 14.2W of output at 1.98µm for 38.3W of launched pump power with a slope efficiency of ~36%. This was the highest reported power from a Tm3+:silica fibre laser to the author's knowledge. A tunable Tm3+ fibre laser showed > 1.8W output power across a tuned wavelength range of 1870-2030 nm.

PDF
Hayward_2003_thesis_3251.pdf - Other
Download (7MB)

More information

Published date: 2003
Organisations: University of Southampton

Identifiers

Local EPrints ID: 41525
URI: http://eprints.soton.ac.uk/id/eprint/41525
PURE UUID: 3e81b3a8-88b2-452c-a477-230e9a29f2ad

Catalogue record

Date deposited: 26 Sep 2006
Last modified: 17 Jul 2017 15:30

Export record

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×