Analog phase lock between two lasers at LISA power levels

authored by

Christian Diekmann, Frank Steier, Benjamin Sheard, Gerhard Heinzel, Karsten Danzmann

Abstract

This paper presents the implementation of an analog optical phase-locked-loop with an offset frequency of about 20MHz between two lasers, where the detected light powers were of the order of 31 pW and 200 μW. The goal of this setup was the design and characterization of a photodiode transimpedance amplifier for application in LISA. By application of a transimpedance amplifier designed to have low noise and low power consumption, the phase noise between the two lasers was a factor of two above the shot noise limit down to 60mHz. The achievable phase sensitivity depends ultimately on the available power of the highly attenuated master laser and on the input current noise of the transimpedance amplifier of the photodetector. The limiting noise source below 60mHz was the analog phase measurement system that was used in this experiment. A digital phase measurement system that is currently under development at the AEI will be used in the near future. Its application should improve the sensitivity.

External Organisation(s)

Max Planck Institute for Gravitational Physics (Albert Einstein Institute)

Type

Conference article

Journal

Journal of Physics: Conference Series

Volume

154

ISSN

1742-6588

Publication date

2009

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

General Physics and Astronomy

Electronic version(s)

https://doi.org/10.1088/1742-6596/154/1/012020 (Access: Open)