| Autor: |
Tarquin Ralph, D., Altin, Paul A., Rabeling, David S., McClelland, David E., Shaddock, Daniel A. |
| Zdroj: |
Applied Optics; March 2017, Vol. 56 Issue: 8 p2353-2358, 6p |
| Abstrakt: |
We present a new technique for the fine alignment sensing of optical interferometers. Unlike conventional wavefront sensing systems, which use multielement photodiodes, this approach works with a single-element photodiode, in combination with a spatial light modulator (SLM) and digitally enhanced heterodyne interferometry. As all signals pass through a single photodetection and analog path, the technique exhibits high common-mode rejection to low frequency errors present in conventional systems. By changing the modulation pattern on the SLM, the technique can also be extended to sensing higher-order wavefront errors. In this paper, we demonstrate the technique experimentally and compare performance with a conventional heterodyne wavefront sensing system. This may improve and simplify alignment systems in space-based interferometers such as the planned LISA gravitational wave detector and provide a way to optimize the power in laser cavities not possible with the traditional segmented diode approach. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
