High stability laser for next generation gravity missions
- Nicklaus, K.
- Herding, M.
- Wang, X.
- Beller, N.
- Fitzau, O.
- Giesberts, M.
- Herper, M.
- Barwood, G.P.
- Williams, R.A.
- Gill, P.
- Koegel, H.
- Webster, S.A.
- Gohlke, M.
DOIAbstract
With GRACE (launched 2002) and GOCE (launched 2009) two very successful missions to measure earth’s gravity field have been in orbit, both leading to a large number of publications. For a potential Next Generation Gravity Mission (NGGM) from ESA a satellite-to-satellite tracking (SST) scheme, similar to GRACE is under discussion, with a laser ranging interferometer instead of a Ka-Band link to enable much lower measurement noise. Of key importance for such a laser interferometer is a single frequency laser source with a linewidth <10 kHz and extremely low frequency noise down to 40 Hz / √Hz in the measurement frequency band of 0.1 mHz to 1 Hz, which is about one order of magnitude more demanding than LISA. On GRACE FO a laser ranging interf...
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