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In one embodiment, a block for a physics package of an atomic sensor is provided. The block comprises one or more sections of optically transparent material defining a vacuum sealed chamber, and including a plurality of transmissive and reflective surfaces to define a plurality of light paths inters

In one embodiment, a block for a physics package of an atomic sensor is provided. The block comprises one or more sections of optically transparent material defining a vacuum sealed chamber, and including a plurality of transmissive and reflective surfaces to define a plurality of light paths intersecting the vacuum sealed chamber. The one or more sections of optically transparent material include a first monolithic section defining at least a portion of the vacuum sealed chamber. The first monolithic section includes a first portion disposed across a first light path of the plurality of light paths such that light in the first light path is incident on the first portion of the first monolithic section.

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1. A block for a physics package of an atomic sensor, the block comprising: a monolithic structure composed of an optically transparent material, the monolithic structure defining: an entire vacuum sealed chamber;a plurality of light path bores, each of the plurality of light path bores defining a l

1. A block for a physics package of an atomic sensor, the block comprising: a monolithic structure composed of an optically transparent material, the monolithic structure defining: an entire vacuum sealed chamber;a plurality of light path bores, each of the plurality of light path bores defining a light path of a plurality of light paths, each of the plurality of light path bores having an exterior opening at a first end, wherein a first light path bore of the plurality of light path bores ends at a first internal surface of the monolithic structure;wherein the first internal surface is a transmissive surface such that light in the first light path bore can transmit through the monolithic structure between the first light path bore and an exterior of the monolithic structure; anda plurality of mirrors or windows fixedly attached over the exterior openings of the light path bores. 2. The block of claim 1, wherein the plurality of light paths include a plurality of optical lightwave paths and at least one measurement light path. 3. The block of claim 1, wherein an outer surface of the monolithic structure reverse of the internal surface is a transmissive surface. 4. The block of claim 1, wherein a second light path bore of the plurality of light path bores ends at a second internal surface of the monolithic structure, the second internal surface including a reflective coating to reflect light in the second light path bore. 5. The block of claim 1, comprising: a chamber evacuation structure fixedly attached over a first exterior opening of the vacuum sealed chamber; anda sample container fixedly attached over a second exterior opening of the vacuum sealed chamber. 6. The block of claim 1, wherein the monolithic structure includes a plurality of faces on an exterior thereof, the plurality of faces disposed at predetermined angles to one another. 7. The block of claim 1, wherein the monolithic structure is composed of one of a glass, glass-ceramic, an optical glass, or sapphire. 8. A block for a physics package of an atomic sensor, the block comprising: two or more monolithic sections of optically transparent material fixedly attached together to define a vacuum sealed chamber, the two or more monolithic sections including a plurality of transmissive and reflective surfaces to define a plurality of light paths intersecting the vacuum chamber;wherein at least one of the two or more sections defines at least a portion of the vacuum sealed chamber and is disposed across a first light path of the plurality of light paths such that light in the first light path is incident on the at least one section. 9. The block of claim 8, wherein the two or more sections are fixedly attached with a frit seal. 10. The block of claim 8, wherein the at least one section includes a transmissive surface disposed across the first light path such that light in the first light path can transmit through the at least one section between the vacuum sealed chamber and an exterior of the block. 11. The block of claim 8, wherein the at least one section includes a reflective surface disposed across the first light path such that light in the first light path from the vacuum sealed chamber can reflect back into the vacuum sealed chamber. 12. The block of claim 8, wherein the plurality of light paths include a plurality of optical lightwave paths and at least one measurement light path. 13. The block of claim 8, comprising: a chamber evacuation structure fixedly attached over a first exterior opening of the vacuum sealed chamber; anda sample container fixedly attached over a second exterior opening of the vacuum sealed chamber. 14. The block of claim 8, wherein the monolithic structure includes a plurality of faces on an exterior thereof, the plurality of faces disposed at predetermined angles to one another. 15. The block of claim 8, wherein the monolithic structure is composed of one of a glass, glass-ceramic, an optical glass, or sapphire. 16. A block for a physics package of an atomic sensor, the block comprising: a monolithic structure composed of an optically transparent material, the monolithic structure defining: a vacuum sealed chamber;a plurality of light path bores, each of the plurality of light path bores defining a light path of a plurality of light paths, each of the plurality of light path bores having an exterior opening at a first end, wherein a first light path bore of the plurality of light path bores ends at a first internal surface of the monolithic structure;wherein the first internal surface is a reflective surface such that light in the at least one light path bore from the vacuum sealed chamber can reflect back into the vacuum sealed chamber; anda plurality of mirrors or windows fixedly attached over the exterior openings of the light path bores. 17. The block of claim 16, wherein the plurality of light paths include a plurality of optical lightwave paths and at least one measurement light path. 18. The block of claim 16, wherein a second light path bore of the plurality of light path bores ends at a second internal surface of the monolithic structure, wherein the second internal surface is a transmissive surface such that light in the second light path bore can transmit through the monolithic structure between the second light path bore and an exterior of the monolithic structure. 19. The block of claim 16, comprising: a chamber evacuation structure fixedly attached over a first exterior opening of the vacuum sealed chamber; anda sample container fixedly attached over a second exterior opening of the vacuum sealed chamber. 20. The block of claim 16, wherein the monolithic structure is composed of one of a glass, glass-ceramic, an optical glass, or sapphire.