Dual Band Active Nanostructured Core Fiber for Two-Color Fiber Laser Operation


Franczyk M., Pysz D., Stepien R., Cimek J., Kasztelanic R., Chen F.L., Klimczak M., Zhao L., Kasik I., Peterka P., and Buczynski R.


We present the experimental verification of a new type of an active nanostructured fiber devoted to simultaneous laser emission at two wavelengths: 1040 nm and 1534 nm in the fundamental mode. The fiber core is formed with two types of nanorods made of a phosphate glass doped with either Yb 3+ or co-doped with Yb 3+ /Er 3+ ions, respectively. A distribution of the nanorods in the core allows to control relative gain and modal properties of the fiber at both wavelengths and to maintain the single mode performance with a high quality beam generated in a single fiber core. The double-cladding fiber structure allows efficient excitation with a single 975 nm diode pump laser. As a proof-of-concept we demonstrated an active fiber with 15 µm core diameter composed of 6649 nanorods with an individual diameter of 160 nm. The fiber was used in a laser setup. The laser operation was verified for simultaneous two-color laser generation at output power levels of 0.78 W and 0.42 W with slope efficiency of 23.0% and 9.8% at 1040 nm and 1534 nm, respectively.

Journal of Lightwave Technology, 2022, vol. 40(21), pp. 7180-7190, doi: 10.1109/JLT.2022.3199581

Originally published on - Nov. 7, 2022, 8 a.m.
Last update on - Nov. 7, 2022, 11:47 a.m.
Publisher - Sekretariat IGF