The GEO 600 stabilized laser system and the current-lock technique

Details The GEO 600 stabilized laser system and the current-lock technique The GEO 600 stabilized laser system and the current-lock technique

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..523..215w&link_type=abstract

GRAVITATIONAL WAVES: Third Edoardo Amaldi Conference. AIP Conference Proceedings, Volume 523, pp. 215-221 (2000).

Physics

2

Laser Optical Systems: Design And Operation, Gravitational Wave Detectors And Experiments

Scientific paper

This talk will give an overview over the GEO 600 laser-diode pumped Nd:YAG laser system. After an introduction which defines the requirements, we describe the laser design and the laser frequency stabilization scheme. Due to its low power noise in the radio frequency region and due to its good spatial beam quality, an injection-locked master-slave design is used for the GEO 600 laser. This laser system has an output power of 12 W and a good spatial profile (M2<=1.05). A monolithic non-planar ring-oscillator (NPRO) with an optical power of 0.8 Watt is used as the master laser. By stabilizing the NPRO to a reference cavity we achieve an frequency noise spectral density of less than 1mHz/Hz for fourier frequencies between 10 Hz and 1 kHz at the feed-back loop error point. Finally we present a new scheme to stabilize the frequency of a NPRO by feeding back to the power of its laser-diode pump-source. First experiments with this so-called current-lock technique led to a robust lock and simultaneously to a reduction in power-noise of the NPRO without an additional power stabilization control system. .

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