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Diffraction-limited Yb-doped double-clad all-solid photonic bandgap fiber laser at 976 nm
Author(s): Turghun Matniyaz; Monica T. Kalichevsky-Dong; Thomas W. Hawkins; Joshua Parsons; Guancheng Gu; Wensong Li; Max Faykus; Bradley Selee; Jonathan A. Dong; Liang Dong
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Paper Abstract

Diffraction-limited 976nm lasers can be used to core-pump ultrafast fiber lasers to overcome nonlinearities with significantly shortened fiber lengths or to pump ultrafast solid-state lasers for much improved beam quality. In order to make Yb fiber lasers operate efficiently as a three-level system at ~976nm, it is critical to use double-clad fibers with large core-to-cladding ratio and additional spectral filters, such as dichroic mirrors in free space or fiber Bragg gratings in all-fiber configurations, to suppress lasing at longer wavelengths. Diffraction-limited 94W at 976nm was achieved in 2008 with an efficiency of ~50% with respect to the launched pump powers at ~915nm using a rod-type PCF and multiple dichroic mirrors. However, the results from flexible fibers with the potential to be used for monolithic fiber lasers are far worse. In this work, the Yb-doped double-clad all-solid photonic bandgap fiber has a core diameter of ~25μm and a cladding diameter of ~125μm. The photonic bandgap was engineered to have its long wavelength band edge just beyond 976nm to suppress lasing at longer wavelengths. We demonstrate a record efficiency of ~54% with regard to the coupled pump power at ~915nm. Pump-limited 38W at ~977nm was achieved with a M2 of ~1.24. ASE at ~1026nm was suppressed by <30dB at all powers. This is possible due to the use of all-solid photonic bandgap fibers which provide both the necessary large core-to-cladding ratio and the additional suppression of the four-level system by strong out-of-band transmission loss.

Paper Details

Date Published: 7 March 2019
PDF: 6 pages
Proc. SPIE 10897, Fiber Lasers XVI: Technology and Systems, 108970V (7 March 2019); doi: 10.1117/12.2505798
Show Author Affiliations
Turghun Matniyaz, Clemson Univ. (United States)
Monica T. Kalichevsky-Dong, Clemson Univ. (United States)
Thomas W. Hawkins, Clemson Univ. (United States)
Joshua Parsons, Clemson Univ. (United States)
Guancheng Gu, Coherent | Nufern (United States)
Wensong Li, Xiamen Univ. (China)
Max Faykus, Clemson Univ. (United States)
Bradley Selee, Clemson Univ. (United States)
Jonathan A. Dong, D. W. Daniel High School (United States)
Liang Dong, Clemson Univ. (United States)

Published in SPIE Proceedings Vol. 10897:
Fiber Lasers XVI: Technology and Systems
Adrian L. Carter; Liang Dong, Editor(s)

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