Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 14: Precision Measurements and Metrology III (with Q)

A 14.5: Vortrag

Dienstag, 24. März 2015, 12:15–12:30, G/gHS

Characterization and stabilization of a high-power fiber amplifier — •Patrick Oppermann, Fabian Thies, and Benno Willke — Max-Planck-Institut für Gravitationsphysik und Leibniz Universität Hannover (AEI)

We present a detailed beam characterization of continuous-wave single frequency fiber amplifier with an output power of more than 180 W at a wavelength of 1064 nm. The power noise, frequency noise, beam pointing fluctuations and spatial beam quality were measured with an optical ring resonator. The results are compared with the Advanced LIGO Pre-Stabilized Laser system. The advantage of this laser system is the use of new actuators for power stabilization of each amplifier stage with a power-shunt and an EO-AM to modulate the seed laser. First, stabilization of the pre-amplifier with 20 W to an over all relative power noise of 1*10e-8/sqrt(HZ) is shown. Then the main amplifier is stabilized with a second power-shunt.