Monolithic Side-Pumped Amplifier Based on an Yb-Doped Tapered-Fiber and Yielding 0.53 MW 9.3 ps Pulses
Konstantin Bobkov,
Andrey Levchenko,
Denis Lipatov,
Alexey Guryanov,
Mikhail Bubnov,
Mikhail Likhachev
Affiliations
Konstantin Bobkov
Prokhorov General Physics Institute of the Russian Academy of Sciences, Dianov Fiber Optics Research Center of the Russian Academy of Sciences, 119991 Moscow, Russia
Andrey Levchenko
Prokhorov General Physics Institute of the Russian Academy of Sciences, Dianov Fiber Optics Research Center of the Russian Academy of Sciences, 119991 Moscow, Russia
Denis Lipatov
G.G. Devyatykh Institute of Chemistry of High Purity Substances of the Russian Academy of Sciences, 603950 Nizhny Novgorod, Russia
Alexey Guryanov
G.G. Devyatykh Institute of Chemistry of High Purity Substances of the Russian Academy of Sciences, 603950 Nizhny Novgorod, Russia
Mikhail Bubnov
Prokhorov General Physics Institute of the Russian Academy of Sciences, Dianov Fiber Optics Research Center of the Russian Academy of Sciences, 119991 Moscow, Russia
Mikhail Likhachev
Prokhorov General Physics Institute of the Russian Academy of Sciences, Dianov Fiber Optics Research Center of the Russian Academy of Sciences, 119991 Moscow, Russia
We demonstrated a simple design of a monolithic all-fiber side-coupled combiner for counter-pumped amplifiers that requires no special fiber processing systems for fabrication. The combiner based on a Yb-doped polarization-maintained tapered fiber with an output core diameter of 40 µm and a total length of 1.8 m exhibiting over 60% coupling efficiency of 976 nm 0.10 NA pump power was demonstrated and utilized to amplify 1064 nm 9.3 ps 1.84 MHz pulses up to 9.1 W of average power and 0.53 MW of peak power with near diffraction-limited beam quality. The demonstrated approach seems promising for further power scaling, retaining good output beam characteristics via design optimization.
