High stability single-frequency Yb fiber amplifier for next generation gravity missions

Abstract

In scope of the ESA funded "High stability Laser" activity, a single-mode and single-frequency fiber power amplifier with 500 mW output power at 1064 nm wavelength has been developed. It is part of an elegant breadboard (EBB) which consists additionally of an ultra-stable Fabry-Perot reference for frequency stabilization. The monolithic fiber amplifier is seeded by a non-planar ring oscillator (NPRO) with a linewidth below 10 kHz. The amplifier is stabilized in power via pump diode modulation and achieves a RIN performance of <0.01/sqrt(Hz) in the range from 10(-3) Hz to 10 Hz and a polarization extinction ratio of >30 dB

High stability laser for interferometric earth gravity measurements

“…In contrast to the first results presented in [4] and [5], the operational tests were performed with a frequency and power stabilized HSL EBB.…”

“…The multi-mode fibre of the pump diode is spliced to the fibre amplifier. The light from the pump diode is contra-directionally coupled into an active Yb-doped fibre via a pump combiner inside the fibre amplifier box; see [5] for further details. …”