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Abstract
We performed a comparative study of Yb-doped double-clad large mode area (${\rm{MFD}} = {{31}}\;{\rm{\unicode{x00B5}{\rm m}}}$) spun tapered fibers with different pitch lengths. A novel type of spun tapered fibers with constant pitch lengths of 7.5, 15, and 30 mm, internal birefringence as low as ${\sim}{{10}^{- 8}}$, and perfect output beam quality (${{\rm{M}}^2}\; \lt \;{1.2}$) has been manufactured and investigated. We demonstrated the efficient direct amplification of a picosecond pulsed signal (95 ps/100 MHz, 1064 nm) in the spun active tapered fiber with optimized geometry providing an average output power of 71 W (gain 32 dB, 74% slope efficiency). Efficient green light generation ($\lambda = {{532}}\;{\rm{nm}}$) with 17 W average power (1.7 µJ) and 80 pm linewidth was demonstrated using the developed master oscillator power amplifier system.
© 2021 Optical Society of America
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