26 February 2018 Cladding pumped Yb-doped HOM power amplifier with high gain
Author Affiliations +
Proceedings Volume 10512, Fiber Lasers XV: Technology and Systems; 105121E (2018) https://doi.org/10.1117/12.2290523
Event: SPIE LASE, 2018, San Francisco, California, United States
Abstract
Higher-order mode (HOM) fibers have been engineered to allow propagation of linearly polarized symmetric modes LP0,N in a robust way. Compared with the fundamental mode LP(0,1), HOMs exhibits an effective area that can be larger by over two order magnitude, and thus propagating light in these modes could greatly suppress the effect of nonlinear effects. HOM fibers could also be doped with rare earth ions in order to amplify light propagating in these modes, which offers the enormous potential for generating high-intensity pulses. Excitation of HOM gain fiber using cladding pumping with multimode pump source is attractive for ytterbium based amplifiers, because of the availability of low-cost multimode pump diodes in the 975nm wavelength range. One problem associated with cladding pumping which leads to excitation of the large doped core (over 100 μm diameter) is that it could result in a large amount of amplifiedspontaneous- emission (ASE) noise, particularly when the input signal is weak. Optimization of amplifier design is critical in order to suppress ASE and achieve high gain and pump-to-signal conversion efficiency. We conducted numerical modeling of a cladding pumped HOM-amplifier, which revealed that this problem could be mitigated by using a relatively long gain-fiber that allowed reabsorption of the forward propagating ASE resulting in a further amplification of the signal. We demonstrate efficient amplification of a LP0,10 mode with an effective area 3140μm2 in an Yb-doped HOM amplifier cladding pumped at 975nm. We have successfully obtained a 20.2dB gain for 0.95 W 1064 nm input seed signal to more than 105W.
Conference Presentation
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kazi S. Abedin, Raja Ahmad, Anthony M. DeSantolo, Jeffrey W. Nicholson, Paul S. Westbrook, Clifford Headley, David J. DiGiovanni, "Cladding pumped Yb-doped HOM power amplifier with high gain", Proc. SPIE 10512, Fiber Lasers XV: Technology and Systems, 105121E (26 February 2018); doi: 10.1117/12.2290523; https://doi.org/10.1117/12.2290523
PROCEEDINGS
6 PAGES + PRESENTATION

SHARE
RELATED CONTENT

High power all fiber picosecond MOPA laser based on hybrid...
Proceedings of SPIE (September 17 2013)
Unique high-power fiber laser technologies
Proceedings of SPIE (January 12 2005)
Analytic modeling of three level fibered amplifiers
Proceedings of SPIE (June 17 2003)
Photodarkening measurements in large mode area fibers
Proceedings of SPIE (February 21 2007)

Back to Top