High SBS-threshold, narrowband, erbium codoped with ytterbium fiber amplifier pulses frequency-doubled to 770 nm

Dilley, C. E.; Stephen, Mark; Savage-Leuchs, Matthias

doi:10.1364/oe.15.014389

Cited by 36 publications

(25 citation statements)

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“…Note that the power of the 1 st SBS Stokes pulse is limited in this regime mainly by the available "pump" (forward propagating signal at the input of amplifier -average power of 10-20 mW). Similar behavior of the trailing edge due to SBS was also reported by C. E. Dilley et al [5].…”

Section: Instabilities Caused By Sbssupporting

confidence: 88%

“…However, efficient energy transitions from Yb to Er ions requires a co-doping of the fiber core with a significant amount of phosphorus, which increases the numerical aperture (NA) and therefore limits the diameter of the single mode core. Thus, up to 6 kW of peak power can be obtained from single-frequency multimode Er-Yb fiber lasers (M 2~5 ) [4] and up to 360 W in the single-mode regime [5]. In addition, a significant drawback of such lasers is the Ytterbium emission near 1 micron, which presents an eye safety concern.…”

Section: Introductionmentioning

confidence: 99%

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Single-mode single-frequency high peak power all-fiber MOPA at 1550 nm

et al. 2014

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In this Report, we present a record-high-peak-power single-frequency master oscillator power amplifier (MOPA) system based on a newly developed double-clad large-mode-area Yb-free Er-doped fiber (DC-LMA-EDF). A fiber Bragg grating wavelength-stabilized fiber-coupled diode laser at λ=1551 nm with ~2 MHz spectral width was used as the master oscillator. Its radiation was externally modulated with a 5 kHz repetition rate and 92 ns pulse duration and then amplified in a core-pumped Er-doped fiber amplifier up to an average power of 4 mW. The amplified spontaneous emission (ASE) generated at the last preamplifier stage was suppressed by a narrow-band (0.7 nm) DWDM filter. The last MOPA stage was based on the recently developed single-mode DC-LMA-EDF with a mode field diameter of 25 microns and pump clad-absorption of 3 dB/m at λ=980 nm. The pump and the signal were launched into this fiber through a commercial pump combiner in a co-propagating amplifier scheme. At first, we used a 3-m long DC-LMA-EDF. In such configuration, a peak power of 800 W was achieved at the output of the amplifier together with a ~ 12 % pump conversion slope efficiency. Further power scaling was limited by SBS. After that we shortened the fiber length to 1 m. As a result, owing to large unabsorbed pump power, the efficiency decreased to ~5 %. However, a peak power of more than 3.5 kW was obtained before the SBS threshold. In this case, the pulse shape changed and its duration decreased to ~60 ns owing to inversion depletion after propagation of the forward front of the pulse. To the best of our knowledge, the peak power of more than 3.5 kW reported here is the highest value ever published for a single-frequency single-mode silica-based fiber laser system operating near λ=1550 nm.

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Section: Instabilities Caused By Sbssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Single-mode single-frequency high peak power all-fiber MOPA at 1550 nm

et al. 2014

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“…This allows keeping single mode regime at large core diameters. And (2) 3 were used as precursors. The uniform Er-doped P 2 O 5 -Al 2 O 3 -SiO 2 core was produced by the following procedure.…”

Section: Pm Lma Edf Designmentioning

confidence: 99%

“…As a result, peak power of standard telecom-grade fiber amplifiers is SBS limited at value of ~10 W, which does not allow one to increase scanning distance to be more than 1-2 km [1,2]. Standard technique to suppress SBS is increasing mode field diameter (MFD) of the fiber and shortening its length [3][4][5][6], resulting in typical peak-power for such systems of hundreds of Watts. Recently record peak-power of 4 kW was demonstrated by our group from single-frequency Er-doped amplifier based on just 1 m of active fiber with 500 μm 2 mode area [5].…”

Section: Introductionmentioning

confidence: 99%

Monolithic high peak-power coherent Doppler lidar system

et al. 2016

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In this work we present a monolithic lidar system, based on a newly-developed double-clad large mode area (LMA) polarization-maintaining Er-doped fiber and specially designed LMA passive components. Optimization of the fiber designs resulted in as high as 100 W of SBS limited peak power. The amplifier and its passive components (circulator and collimator) were integrated in an existing lidar system. The enhanced lidar system provides three times increase of scanning range compared to one based on standard telecom-grade amplifiers.

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“…Currently, doubleclad Er-Yb-sensitized fibers are widely used to increase the output power of fiber lasers at 1.55 microns [2][3][4]. However, efficient energy transitions from Yb to Er ions requires a co-doping of the fiber core with a significant amount of phosphorus, which increases the numerical aperture (NA) and therefore limits the diameter of the single mode core.…”

Section: Comparison Of Different Laser Schemesmentioning

confidence: 99%

Record peak power single-frequency erbium-doped fiber amplifiers

et al. 2015

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In this work we present results on the amplification of narrow-linewidth nanosecond pulses in a recently developed ytterbium-free erbium-doped large mode area fiber cladding pumped at 980 nm. At first, a co-propagating all-fiber amplifier scheme was used. Using 1 m of active fiber length in such configuration a peak power of 4 kW limited by instabilities caused by stimulated Brillouin scattering (SBS) was achieved. To the best of our knowledge this is the highest peak power ever reported for single-frequency single-mode silica-based fiber sources near 1550 nm.Then all-fiber counter-pumped configuration with 6 m of active fiber was used and peak power of 900 W was obtained. In this case peak power was limited by SBS generation in a passive fiber at the laser output. Slope electrical-to-optical conversion efficiency of 8 % demonstrated in such scheme is a record value for kW-level single-mode single-frequency Er-doped nanosecond fiber lasers.

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High SBS-threshold, narrowband, erbium codoped with ytterbium fiber amplifier pulses frequency-doubled to 770 nm

Cited by 36 publications

References 0 publications

Single-mode single-frequency high peak power all-fiber MOPA at 1550 nm

Single-mode single-frequency high peak power all-fiber MOPA at 1550 nm

Monolithic high peak-power coherent Doppler lidar system

Record peak power single-frequency erbium-doped fiber amplifiers

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