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End-pumped Nd:YVO4 laser with reduced thermal lensing via the use of a ring-shaped pump beam

End-pumped Nd:YVO4 laser with reduced thermal lensing via the use of a ring-shaped pump beam
End-pumped Nd:YVO4 laser with reduced thermal lensing via the use of a ring-shaped pump beam
A simple approach for alleviating thermal lensing in end-pumped solid-state lasers using a pump beam with a ring-shaped intensity distribution to decrease the radial temperature gradient is described. This scheme has been implemented in a diode-end-pumped Nd:YVO4 laser yielding 14 W of TEM00 output at 1.064 μm with a corresponding slope efficiency of 53% and a beam propagation factor (M2) of 1.08 limited by available pump power. By comparison, the same laser design with a conventional quasi-top-hat pump beam profile of approximately equal radial extent yielded only 9 W of output before the power rolled over due to thermal lensing. Further investigation with the aid of a probe beam revealed that the thermal lens power was ~30% smaller for the ring-shaped pump beam compared to the quasi-top-hat beam. The implications for further power scaling in end-pumped laser configurations are considered.
0146-9592
2910-2913
Lin, Di
d858c2c7-6eab-49d8-87e7-6b71d9bad013
Clarkson, W. Andrew
3b060f63-a303-4fa5-ad50-95f166df1ba2
Lin, Di
d858c2c7-6eab-49d8-87e7-6b71d9bad013
Clarkson, W. Andrew
3b060f63-a303-4fa5-ad50-95f166df1ba2

Lin, Di and Clarkson, W. Andrew (2017) End-pumped Nd:YVO4 laser with reduced thermal lensing via the use of a ring-shaped pump beam. Optics Letters, 42 (15), 2910-2913. (doi:10.1364/OL.42.002910).

Record type: Article

Abstract

A simple approach for alleviating thermal lensing in end-pumped solid-state lasers using a pump beam with a ring-shaped intensity distribution to decrease the radial temperature gradient is described. This scheme has been implemented in a diode-end-pumped Nd:YVO4 laser yielding 14 W of TEM00 output at 1.064 μm with a corresponding slope efficiency of 53% and a beam propagation factor (M2) of 1.08 limited by available pump power. By comparison, the same laser design with a conventional quasi-top-hat pump beam profile of approximately equal radial extent yielded only 9 W of output before the power rolled over due to thermal lensing. Further investigation with the aid of a probe beam revealed that the thermal lens power was ~30% smaller for the ring-shaped pump beam compared to the quasi-top-hat beam. The implications for further power scaling in end-pumped laser configurations are considered.

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End-pumped NdYVO4 laser with reduced thermal lensing_Accepted Version - Accepted Manuscript
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Accepted/In Press date: 30 June 2017
e-pub ahead of print date: 30 June 2017
Published date: 1 August 2017
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 412024
URI: https://eprints.soton.ac.uk/id/eprint/412024
ISSN: 0146-9592
PURE UUID: 452b1376-5e8a-47e1-bc1d-7e4ab231e90f

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Date deposited: 05 Jul 2017 16:31
Last modified: 10 Dec 2019 05:56

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