Laser phase-locking techniques for LISA: Experimental status

Details Laser phase-locking techniques for LISA: Experimental status Laser phase-locking techniques for LISA: Experimental status

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..456..143m&link_type=abstract

The second international laser interferometer space antenna symposium (LISA) on the detection and observation of gravitational w

Other

4

Gravitational Wave Detectors And Experiments, Gravitational Radiation Detectors, Mass Spectrometers, And Other Instrumentation And Techniques

Scientific paper

Phase-locking of a slave laser to weak incoming light is an essential ingredient of the laser transponders to be used in LISA. Here we report on an experiment to evaluate such a weak-light phase-locking scheme, in which two independent diode-pumped Nd:YAG non-planar ring oscillators are locked together with a 15 MHz frequency offset. With a weak-light intensity of 17 nW we observe close to shot-noise limited performance of the phase locking system over a frequency range from 800 Hz down to 10 Hz. Excess noise is observed at lower frequencies-reaching two orders of magnitude above the shot-noise limit at 10-4 Hz-most probably due to seismic and temperature effects on the optical layout. The level of the unlocked relative phase fluctuations is observed to be anomalously low, compared with that deduced from separate experiments in which one of the lasers was frequency stabilized to a reference cavity [1,2]. The possibility of partial injection locking of the lasers due to leakage light cannot be excluded. Caution in interpretation of the results is therefore warranted.

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