High power 1726 nm operation of a thulium fiber laser pumped in-band by an erbium-only fiber laser (Conference Presentation)

Mark D. Burns; Peter C. Shardlow; Pranabesh Barua; Thomas L. Jefferson-Brain; Jayanta Sahu; William A. Clarkson

doi:10.1117/12.2510354

13 March 2019 High power 1726 nm operation of a thulium fiber laser pumped in-band by an erbium-only fiber laser (Conference Presentation)

Mark D. Burns, Peter C. Shardlow, Pranabesh Barua, Thomas L. Jefferson-Brain, Jayanta Sahu, William A. Clarkson

Author Affiliations +

Proceedings Volume 10897, Fiber Lasers XVI: Technology and Systems; 108970O (2019) https://doi.org/10.1117/12.2510354
Event: SPIE LASE, 2019, San Francisco, California, United States

Abstract

There are a number of spectral features around 1700 nm which are very attractive to the laser community. Strong C-H bond absorption and moderate water absorption lend this region to many applications such as polymer processing and laser surgery. Despite being a growing area of interest, development of high-power, laser sources in this region is quite challenging. Here we present preliminary results of in-band pumping a thulium-doped fiber laser (TDFL) with erbium-only doped fiber laser (EDFL) to generate 1700 nm Erbium-only was chosen to avoid the power scaling limitations of co-doping with ytterbium. Parasitic lasing on the ytterbium band at 1030 nm results in efficiency roll-off and self-pulsing. Because of this, single-mode Er/Yb laser systems are generally limited to moderate powers of ~20W and reliability remains an issue. An in-house double-clad large mode-area fiber, with a fundamental mode-field diameter of 20 um, was cladding pumped at 975 nm. Maximum power at 90 W launched was 31 W and the slope efficiency was 44.2% (35.4%) with respect to absorbed (launched) pump power. Suitability for high-brightness core pumping of a TDFL was confirmed with an M2 measurement of 1.1 ± 0.1. For 1700 nm generation, the 1580 nm pump light was free-space coupled into an in-house TDF (0.2 wt.% dopant concentration). For a maximum launched power of 23 W, 15 W of 1726 nm output was generated with a slope efficiency of 67.1% (64.7%) with respect to absorbed (launched). To the author’s best knowledge, this is the highest recorded power in this wavelength region from a TDFL.

Conference Presentation

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Mark D. Burns, Peter C. Shardlow, Pranabesh Barua, Thomas L. Jefferson-Brain, Jayanta Sahu, and William A. Clarkson "High power 1726 nm operation of a thulium fiber laser pumped in-band by an erbium-only fiber laser (Conference Presentation)", Proc. SPIE 10897, Fiber Lasers XVI: Technology and Systems, 108970O (13 March 2019); https://doi.org/10.1117/12.2510354

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KEYWORDS

Fiber lasers

YAG lasers

Absorption

Ytterbium

High power lasers

Laser development

Laser sources

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