High-bandwidth atom-interferometric gravimetry and accelerometry

A method, comprising:

• providing one or more lasers;
• providing one or more modulators, wherein the one or more lasers and the one or more modulators produce four laser frequencies, wherein a first pair of laser frequencies are separated by wm, wherein a second pair of laser frequencies are separated by wm, and wherein the first pair of laser frequencies and the second pair of laser frequencies are offset by wshift, wherein a first laser frequency of the first pair of laser frequencies and a second laser frequency of the second pair of laser frequencies are separated by wm+wshift, wherein a second laser frequency of the first pair of laser frequencies and a first laser frequency of the second pair of laser frequencies are separated by wm−wshift;
• and
• providing an atomic interferometer, wherein the first pair of laser frequencies is routed to arrive from a first direction at atoms in an interaction region and the second pair of laser frequencies is routed to arrive from a second direction at the atoms in the interaction region, wherein the first direction and the second direction are substantially opposite each other, and wherein the first pair of laser frequencies are phase stable with respect to the second pair of laser frequencies, wherein wm is adjusted so that wm+wshift or wm−wshift corresponds to a Raman resonance for the atomic interferometer.

A method, comprising:

• producing four laser frequencies using one or more lasers and one or more modulators, wherein a first pair of laser frequencies are separated by wm, wherein a second pair of laser frequencies are separated by wm, and wherein the first pair of laser frequencies and the second pair of laser frequencies are offset by wshift, wherein a first laser frequency of the first pair of laser frequencies and a second laser frequency of the second pair of laser frequencies are separated by wm+wshift, wherein a second laser frequency of the first pair of laser frequencies and a first laser frequency of the second pair of laser frequencies are separated by wm−wshift;
• routing the first pair of laser frequencies to arrive from a first direction at atoms in an interaction region;
• and
• routing the second pair of laser frequencies to arrive from a second direction at the atoms in the interaction region, wherein the first direction and the second direction are substantially opposite each other, and wherein the first pair of laser frequencies are phase stable with respect to the second pair of laser frequencies, wherein wm is adjusted so that wm+wshift or wm−wshift corresponds to a Raman resonance for an atomic interferometer.