We present a novel method to generate two phase-locked beams with a frequency offset of 6.834 GHz. The output of the master laser is firstly modulated by an electric optical modulator (EOM), and then further injected into an Extended Cavity Diode Lasers (ECDL) which is used to filter out the unwanted mode and amplify the laser power. By locking to the first-order lower sideband of the modulated master laser, the average variance of the phase fluctuations is 5.6 x 10-3 rad2 , which implies phase coherence of 99.44% between the master laser and the slave ECDL. The line width of the beat notes is less than 1Hz. For the long term stability, with the delicate design of the electronic controller in ECDL, the phase coherence of the two laser beams can be stabilized over 200 hours without any adjustment. The Raman system is applicable for gravity detection with a preliminary sensitivity Δg/g of 4.5 x 10-7 for interrogation time of 1500 s.
The radiation force on a Rayleigh dielectric sphere induced by focused anomalous hollow beams is investigated
theoretically. The results show that the highly focused anomalous hollow beam can be used to trap and manipulate the
particles with the refractive index larger than that of ambient at the focus point, and in the neighborhood of the focal
plane simultaneously, it appears two equilibrium points along transverse direction at the focus plane in the neighborhood
of the focus point, but it cannot stably trap the particles owing to the longitudinal gradient force which could not act as a
restoring force at the corresponding position. And in the neighborhood of the focus plane there also exist three
equilibrium points along transverse direction. It is further found that there exist two equilibrium points off axis position
along longitudinal direction. Finally, the stability conditions for trapping particles are also discussed.
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