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Temperature effects on tunable CW Alexandrite lasers under diode end-pumping

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Title: Temperature effects on tunable CW Alexandrite lasers under diode end-pumping
Authors: Kerridge-Johns, WR
Damzen, MJ
Item Type: Journal Article
Abstract: Diode pumped Alexandrite is a promising route to high power, efficient and inexpensive lasers with a broad (701 nm to 858 nm) gain bandwidth; however, there are challenges with its complex laser dynamics. We present an analytical model applied to experimental red diode end-pumped Alexandrite lasers, which enabled a record 54 % slope efficiency with an output power of 1.2 W. A record lowest lasing wavelength (714 nm) and record tuning range (104 nm) was obtained by optimising the crystal temperature between 8 °C and 105 °C in the vibronic mode. The properties of Alexandrite and the analytical model were examined to understand and give general rules in optimising Alexandrite lasers, along with their fundamental efficiency limits. It was found that the lowest threshold laser wavelength was not necessarily the most efficient, and that higher and lower temperatures were optimal for longer and shorter laser wavelengths, respectively. The pump excited to ground state absorption ratio was measured to decrease from 0.8 to 0.7 by changing the crystal temperature from 10 °C to 90 °C.
Issue Date: 19-Mar-2018
Date of Acceptance: 8-Mar-2018
URI: http://hdl.handle.net/10044/1/57874
DOI: https://dx.doi.org/10.1364/OE.26.007771
ISSN: 1094-4087
Publisher: Optical Society of America (OSA)
Start Page: 7771
End Page: 7785
Journal / Book Title: Optics Express
Volume: 26
Issue: 6
Copyright Statement: © 2018 Optical Society of America. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Keywords: 0205 Optical Physics
1005 Communications Technologies
0906 Electrical And Electronic Engineering
Publication Status: Published
Appears in Collections:Physics
Faculty of Natural Sciences