Raman-Laser System for Absolute Gravimeter Based On 87Rb Atom Interferometer
Open Access
- 15 May 2020
- Vol. 7 (2), 32
- https://doi.org/10.3390/photonics7020032
Abstract
The paper describes a Raman-laser system with high performance for an absolute gravimeter that was based on 87Rb atom interferometer. As our gravimeter is a part of the standard acceleration of gravity of China, the Raman lasers’ characteristics should be considered. This laser system includes two diode lasers. The master laser is frequency locked through the frequency-modulation (FM) spectroscopy technology. Its maximum frequency drift is better than 50 kHz in 11 h, which is measured by home-made optical frequency comb. The slave laser is phase locked to the master laser with a frequency difference of 6.8346 GHz while using an optical phase lock loop (OPLL). The phase noise is lower than −105 dBc/Hz at the Fourier frequency from 200 Hz to 42 kHz. It is limited by the measurement sensitivity of the signal source analyzer in low Fourier frequency. Furthermore, the power fluctuation of Raman lasers’ pulses is also suppressed by a fast power servo system. While using this servo system, Raman lasers’ pulses could be fast re-locked while its fast turning on again in the pulse sequence. The peak value fluctuation of the laser power pulses is decreased from 25% to 0.7%, which is improved over 35 times. This Raman-laser system can stably operate over 500 h, which is suited for long-term highly precise and accurate gravity measurements.Keywords
This publication has 20 references indexed in Scilit:
- The influence of transverse motion within an atomic gravimeterNew Journal of Physics, 2011
- Absolute and ratio measurements of the polarizability of Na, K, and Rb with an atom interferometerPhysical Review A, 2010
- Double diffraction in an atomic gravimeterPhysical Review A, 2010
- Atom interferometry based on light pulses: Application to the high precision measurement of the ratio h/m and the determination of the fine structure constantThe European Physical Journal Special Topics, 2009
- Off-resonant Raman transition impact in an atom interferometerPhysical Review A, 2008
- Tsoft: graphical and interactive software for the analysis of time series and Earth tidesComputers & Geosciences, 2005
- High-precision gravity measurements using atom interferometryMetrologia, 2001
- Demonstration of injection locking a diode laser using a filtered electro-optic modulator sidebandOptics Communications, 2000
- Precision Rotation Measurements with an Atom Interferometer GyroscopePhysical Review Letters, 1997
- Microwave signal generation with optical injection lockingOptics Letters, 1996