Proceedings ArticleDOI
Fiber amplifier utilizing an Yb-doped large-mode-area fiber with confined doping and tailored refractive index profile
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TLDR
In this article, two Yb-doped large-mode-area fibers were manufactured using the Direct Nanoparticle Deposition process: one with a======step refractive index profile and active ion confinement, and another with a tailored re-fraction index profile.Abstract:
Power scaling of Yb-doped large-mode-area fibers drives the scaling of the mode area in order to suppress nonlinearities.
Two Yb-doped large-mode-area fibers were manufactured using the Direct Nanoparticle Deposition process: one with a
step refractive index profile and active ion confinement, and another with a tailored refractive index and active ion
confinement. The index tailoring and doping profiles were designed based on literature to enhance the beam quality of
the fibers. Both fibers exhibited a mode field diameter comparable to a 40μm step index fiber with 0.07 NA. The fibers
were characterized for their geometries, index profiles, and material composition profiles. Additional testing for beam
quality and nonlinearities in pulsed operation was conducted using a power amplifier setup. The beam quality
enhancement capability of the tested fibers was inconclusive due to incomparable launching conditions of the signal to
the fibers.read more
Citations
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Journal ArticleDOI
Room-temperature fiber laser at 3.92 μm
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Ultrafast thulium fiber laser system emitting more than 1 kW of average power.
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Generation of 8 nJ pulses from a normal-dispersion thulium fiber laser
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152 W average power Tm-doped fiber CPA system
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TL;DR: A high-power thulium (Tm)-doped fiber chirped-pulse amplification system emitting a record compressed average output power of 152 W and 4 MW peak power is demonstrated.
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High-power all-fiber wavelength-tunable thulium doped fiber laser at 2 μm.
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References
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Journal ArticleDOI
Spatially and spectrally resolved imaging of modal content in large-mode-area fibers
TL;DR: A new measurement technique, capable of quantifying the number and type of modes propagating in large-mode-area fibers is both proposed and demonstrated, based on both spatially and spectrally resolving the image of the output of the fiber under test.
Journal ArticleDOI
Single-mode excitation of multimode fibers with ultrashort pulses.
TL;DR: Single-mode excitation of step-index multimode fibers with light sources with short temporal coherence lengths is demonstrated and designs with reduced microbending-induced mode coupling are described that allow the propagation of the fundamental mode over long lengths with negligible mode coupling even in the presence of tight fiber bends.
Journal ArticleDOI
Spatial and temporal filtering of a 10-W Nd:YAG laser with a Fabry--Perot ring-cavity premode cleaner.
TL;DR: A fixed-spacer Fabry-Perot ring cavity is used to filter spatially and temporally a 10-W laser-diode-pumped Nd:YAG master-oscillator power amplifier.
Proceedings ArticleDOI
2 kW CW ytterbium fiber laser with record diffraction-limited brightness
Valentin Gapontsev,D.V. Gapontsev,Nikolai Platonov,Oleg Shkurikhin,V V Fomin,A. Mashkin,M. Abramov,S. Ferin +7 more
TL;DR: In this paper, an all-fiber format ytterbium fiber laser with M/sup 2/ < 1.2 was demonstrated, achieving a diffraction-limited brightness of 1400 W.
Journal ArticleDOI
Photodarkening rate in Yb-doped silica fibers.
Joona Koponen,Mikko Söderlund,Hanna J. Hoffman,Dahv A. V. Kliner,Jeffrey P. Koplow,Mircea Hotoleanu +5 more
TL;DR: A seventh-order dependence of the PD rate on the excited-state Yb concentration for two different fibers implies that PD of a Yb-doped fiber source fabricated using a particular fiber will be strongly dependent on the configuration of the device.