Versatile large-mode-area femtosecond laserwritten Tm:ZBLAN glass chip lasers

D. G. Lancaster*, S. Gross, A. Fuerbach, H. Ebendorff Heidepriem, T. M. Monro, M. J. Withford

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)
44 Downloads (Pure)


We report performance characteristics of a thulium doped ZBLAN waveguide laser that supports the largest fundamental modes reported in a rare-earth doped planar waveguide laser (to the best of our knowledge). The high mode quality of waveguides up to 45 um diameter (∼1075 μm2 mode-field area) is validated by a measured beam quality of M2∼1.1 ± 0.1. Benefits of these large mode-areas are demonstrated by achieving 1.9 kW peak-power output Q-switched pulses. The 1.89 μm freerunning cw laser produces 205 mW and achieves a 67% internal slope efficiency corresponding to a quantum efficiency of 161%. The 9 mm long planar chip developed for concept demonstration is rapidly fabricated by single-step optical processing, contains 15 depressed-cladding waveguides, and can operate in semi-monolithic or external cavity laser configurations.

Original languageEnglish
Pages (from-to)27503-27509
Number of pages7
JournalOptics Express
Issue number25
Publication statusPublished - 3 Dec 2012

Bibliographical note

This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.


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