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Proceedings Paper

A mode-hop-free tunable single-longitudinal-mode Nd:YVO4 laser with 25W of power at 1064nm
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Paper Abstract

It is well known that intra-cavity second-harmonic generation (SHG) suppresses mode hopping in solid-state resonators producing single-longitudinal-mode (SLM) output at the second-harmonic frequency (SHF). A simple extension of this concept is to suppress mode hopping in a resonator producing SLM output at the fundamental frequency (through an output-coupling mirror) by inserting an intra-cavity SHG crystal that converts a fraction of the intra-cavity power to the SHF. The beam at the SHF can either be dumped or is available as a second output beam. When combined with a PZT-actuated mirror, it is possible to continuously tune the frequency of the fundamental beam through a significant fraction of the gain bandwidth without mode hopping. SHG also suppresses mode hopping during warm up and during pumppower changes. These features were demonstrated in a unidirectional Nd:YVO4 ring resonator producing an output beam greater than 25W at 1064nm while generating a few Watts at the SHF of 532nm. Mode hopping is substantially reduced during warm up and mode-hop-free operation can be sustained over many hours. Frequency tuning over several GHz was demonstrated and larger tuning ranges are possible. The PZT-actuated mirror can be used to eliminate frequency drift, to stabilize the output to a frequency standard (such as an atomic-absorption line), or to mitigate cavitylength changes due to acoustic noise.

Paper Details

Date Published: 27 February 2009
PDF: 10 pages
Proc. SPIE 7193, Solid State Lasers XVIII: Technology and Devices, 71930P (27 February 2009); doi: 10.1117/12.809288
Show Author Affiliations
Keith M. Murdoch, Coherent, Inc. (United States)
David A. Clubley, Coherent, Inc. (United States)
Michael J. Snadden, Coherent, Inc. (United States)

Published in SPIE Proceedings Vol. 7193:
Solid State Lasers XVIII: Technology and Devices
W. Andrew Clarkson; Norman Hodgson; Ramesh K. Shori, Editor(s)

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