Abstract

We present a novel design of a micro-structured large-pitch, large-mode-area (LMA) asymmetric rod-type fiber. By reducing the cladding symmetry through six high-refractive index germanium-doped silica inclusions, the fiber features strong higher-order mode (HOM) delocalization, leading to a potentially enhanced preferential gain for the fundamental mode in active fibers. In addition, high resolution spatially and spectrally (S2) resolved mode analysis measurements confirm HOM contributions below 1% and LP1m-like HOM contributions below the detection limit. This proposed fiber design enables single-mode operation, with near-diffraction-limited beam quality of M2=1.3 and an effective mode area of 2560  μm2 at 1064 nm. This design opens new insights into improving the threshold-like onset of modal instabilities in high-power fiber lasers and fiber amplifiers by efficiently suppressing LP11 modes.

© 2017 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Mode area scaling with multi-trench rod-type fibers

Deepak Jain, Catherine Baskiotis, and Jayanta Kumar Sahu
Opt. Express 21(2) 1448-1455 (2013)

Highly efficient higher-order modes filtering into aperiodic very large mode area fibers for single-mode propagation

Aurélien Benoît, Romain Dauliat, Raphaël Jamier, Georges Humbert, Stephan Grimm, Kay Schuster, François Salin, and Philippe Roy
Opt. Lett. 39(15) 4561-4564 (2014)

Polarization-maintaining, large-effective-area, higher-order-mode fiber

Raja Ahmad, Man F. Yan, Jeffrey W. Nicholson, Kazi S. Abedin, Paul S. Westbrook, Clifford Headley, Patrick W. Wisk, Eric M. Monberg, and David J. DiGiovanni
Opt. Lett. 42(13) 2591-2594 (2017)

References

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
or
Login to access OSA Member Subscription

Supplementary Material (1)

NameDescription
» Visualization 1: MP4 (3545 KB)      The evolution of the near-field intensity profile of the output beam at 1064 nm under transversal displacement of the launch fiber.

Cited By

You do not have subscription access to this journal. Cited by 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
or
Login to access OSA Member Subscription

Figures (4)

You do not have subscription access to this journal. Figure files 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
or
Login to access OSA Member Subscription

Tables (1)

You do not have subscription access to this journal. Article tables 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
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics 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
or
Login to access OSA Member Subscription