Strong C-H bond absorption [1], and moderate water absorption in the spectral region around ~1.7 μm make this wavelength band of interest for a range of applications, including polymer processing and laser surgery [2]. Despite being a growing area of interest, development of high-power laser sources in this region has been limited. Daniel et al [3], showed that high-power, continuous-wave generation between 1.66 - 1.75 μm could be achieved by in-band pumping thulium-doped fibre (TDF) at 1565 nm using an erbium/ytterbium co-doped (Er/Yb) fibre laser, displaying 12.6 W at 1726 nm. Yb is added as a co-dopant to Er-doped fibres (EDF) to increase pump absorption efficiency. However, parasitic lasing in the Yb emission band at 1 μm can limit efficiency and the onset of self-pulsing can cause catastrophic damage, limiting single-mode output power and operating lifetimes. Here we report the use of a cladding-pumped Er-only fibre laser (EDFL) to core pump a thulium-doped fibre laser (TDFL), efficiently generating >25 W of single-mode output at 1726 nm.

© 2019 IEEE

PDF Article


You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
Login to access OSA Member Subscription