Low phase noise Raman beams for atomic interferometry
Atomic gravimetry requires two phase locked lasers with the correct polarization. It is possible to generate the two beams using a fiber phase modulator. There is a destructive interference that appears with this method from the two Raman pairs produced. We show that a long calcite crystal can be used to turn this into constructive interference. In this scheme it is possible to excite both counter and co propagating Raman transitions. I will also show a way to combine two different hyperfine transitions to reduce the magnetic sensitivity in atomic gravimetry.