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Various embodiments of an optical system for directing light for optical measurements such laser-induced fluorescence and spectroscopic analysis are disclosed. In some embodiments, the optical system includes a thermally conductive housing and a thermoelectric controller, a plurality of optical fibe

Various embodiments of an optical system for directing light for optical measurements such laser-induced fluorescence and spectroscopic analysis are disclosed. In some embodiments, the optical system includes a thermally conductive housing and a thermoelectric controller, a plurality of optical fibers, and one or more optical elements to direct light emitted by the optical fibers to illuminate a flow cell. The housing is configured to attach to a flow cell.

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1. A laser system for directing light for optical measurements, the laser system comprising: a flow cell connector configured to receive a flow cell configured to provide a sample fluid for measurement;a housing defining an interior chamber, wherein the housing is thermally conductive;a plurality of

1. A laser system for directing light for optical measurements, the laser system comprising: a flow cell connector configured to receive a flow cell configured to provide a sample fluid for measurement;a housing defining an interior chamber, wherein the housing is thermally conductive;a plurality of optical fibers within the interior chamber, the plurality of optical fibers configured to receive light from a plurality of lasers disposed outside the housing, said optical fibers having a plurality of output ends;an optical fiber mount configured to orient the plurality of optical fibers with said output ends positioned to emit light toward said flow cell;a plurality of optical input ports coupled to the housing, the optical input ports configured to interchangeably couple to the plurality of lasers such that the plurality of optical fibers are configured to receive the light from the plurality of lasers through the optical input ports and such that the plurality of lasers are interchangeable with other lasers;a thermoelectric controller thermally coupled to the housing, wherein the thermoelectric controller is configured to maintain the interior chamber at a substantially constant temperature to reduce temperature instability and resulting pointing errors. 2. The laser system of claim 1, wherein each output end comprises a center, and wherein the optical fiber mount is configured to position the plurality of optical fibers with the centers of the output ends spaced about 110 to 140 micrometers apart. 3. The laser system of claim 2, wherein the optical fiber mount is configured to position the plurality of optical fibers with the centers of the output ends spaced about 125 micrometers apart. 4. The laser system of claim 1, wherein said plurality of optical fibers comprise a plurality of input ends, the input ends being distributed across a first distance, the output ends being distributed across a second distance, wherein the first distance is greater than the second distance. 5. The laser system of claim 1, wherein the plurality of optical fibers are polarization-maintaining optical fibers. 6. The laser system of claim 1, further comprising a flow cell attached to said flow cell connector. 7. The laser system of claim 1, further comprising: one or more optical elements configured to receive the light output by the plurality of optical fibers, to modify the light, and output a plurality of beams of light, wherein the flow cell connector is configured to position the flow cell to intersect the beams of light. 8. The laser system of claim 7, wherein the plurality of beams of light produced by said one or more optical elements comprise a plurality of substantially elliptical beams of light. 9. The laser system of claim 8, wherein the one or more optical elements comprise a plurality of anamorphic microlenses. 10. The laser system of claim 7, further comprising one or more output windows configured to transmit the beams of light out of the internal chamber. 11. The laser system of claim 10, wherein said flow cell connector is configured to attach the flow cell to the outside of said housing. 12. The laser system of claim 1, wherein the housing is sealed to insulate the interior chamber from ambient air. 13. The laser system of claim 1, wherein the plurality of optical input ports are configured to removably engage a plurality of input optical fibers to interchangeably couple to the plurality of lasers to the plurality of optical input ports. 14. The laser system of claim 1, wherein the plurality of optical input ports comprise a plurality of FC connectors. 15. The laser system of claim 1, wherein the plurality of optical input ports comprise a plurality of angle-polished connections. 16. The laser system of claim 1, further comprising: a plurality of input optical fibers coupled to said optical input ports; anda plurality of laser light sources coupled to said input optical fibers. 17. The laser system of claim 7, wherein the flow cell connector comprises thermally conducting material, said flow cell connector being thermally coupled to the thermoelectric controller, the thermoelectric controller configured to maintain the flow cell at a substantially constant temperature. 18. The laser system of claim 7, wherein the one or more optical elements are disposed in the housing, the one or more optical elements configured to transmit the light out of the internal chamber, and the flow cell connector is configured to attach the flow cell to the outside of the housing. 19. The laser system of claim 1, wherein the flow cell connector is configured to attach the flow cell to the housing with the flow cell passing through said interior chamber. 20. The laser system of claim 19, wherein the flow cell connector comprises at least one seal configured to form a seal around the flow cell. 21. The laser system of claim 1, wherein the housing has a volume of less than about 10 cubic inches. 22. A laser system for directing light for optical measurements, the laser system comprising: a flow cell connector configured to receive a flow cell configured to provide a sample fluid for measurement;a housing defining an interior chamber;a plurality of optical fibers within the interior chamber, the plurality of optical fibers configured to receive light from a plurality of lasers disposed outside the housing, said optical fibers having a plurality of output ends;an optical fiber mount configured to orient the plurality of optical fibers with said output ends positioned to emit light toward said flow cell;a plurality of optical input ports coupled to the housing, the optical input ports configured to interchangeably couple to the plurality of lasers such that the plurality of optical fibers are configured to receive the light from the plurality of lasers through the optical input ports and such that the plurality of lasers are interchangeable with other lasers;one or more lenses within the interior chamber, the one or more lenses configured to receive the light output by the plurality of optical fibers, to modify the light, and to output a plurality of beams of light;wherein the one or more lenses are configured such that the plurality of beams of light produced by the one or more lenses comprise a plurality of substantially elliptical beams of light;wherein each of the plurality of substantially elliptical beams of light have a long axis and a short axis, and wherein the flow cell connector is configured to position the flow cell such that each of the plurality of substantially elliptical beams of light intersect the flow cell with the long axis extending substantially laterally across the flow cell and with the short axis extending substantially longitudinally along the flow cell. 23. The laser system of claim 22, wherein the one or more lenses comprise a plurality of lenses positioned to receive the light output by the respective plurality of optical fibers. 24. The laser system of claim 22, wherein the one or more lenses comprise one or more anamorphic lenses. 25. A laser system for directing light for optical measurements, the laser system comprising: a flow cell connector configured to receive a flow cell configured to provide a sample fluid for measurement;a housing defining an interior chamber, wherein the housing is sealed to insulate the interior chamber from ambient air;a plurality of optical fibers within the interior chamber, the plurality of optical fibers configured to receive light from a plurality of lasers disposed outside the housing, said optical fibers having a plurality of output ends;an optical fiber mount configured to orient the plurality of optical fibers with said output ends positioned to emit light toward said flow cell; anda plurality of optical input ports coupled to the housing, the optical input ports configured to interchangeably couple to the plurality of lasers such that the plurality of optical fibers are configured to receive the light from the plurality of lasers through the optical input ports and such that the plurality of lasers are interchangeable with other lasers. 26. The laser system of claim 25, further comprising one or more optical elements within the interior chamber, the one or more optical elements configured to receive the light output by the plurality of optical fibers, to modify the light, and to output a plurality of substantially elliptical beams of light. 27. The laser system of claim 25, wherein the flow cell connector is configured to attach the flow cell outside the interior chamber of the housing. 28. A laser system for directing light for optical measurements, the laser system comprising: a flow cell connector configured to receive a flow cell configured to provide a sample fluid for measurement;a housing defining an interior chamber, wherein the flow cell connector is configured to attach the flow cell outside the interior chamber of the housing such that the flow cell is not disposed inside the interior chamber of the housing;a plurality of optical fibers within the interior chamber, the plurality of optical fibers configured to receive light from a plurality of lasers disposed outside the housing, said optical fibers having a plurality of output ends;an optical fiber mount configured to orient the plurality of optical fibers with said output ends positioned to emit light toward said flow cell; anda plurality of optical input ports coupled to the housing, the optical input ports configured to interchangeably couple to the plurality of lasers such that the plurality of optical fibers are configured to receive the light from the plurality of lasers through the optical input ports and such that the plurality of lasers are interchangeable with other lasers. 29. The laser system of claim 28, further comprising a thermoelectric controller thermally coupled to the housing, wherein the housing is thermally conductive, and wherein the thermoelectric controller is configured to maintain the interior chamber at a substantially constant temperature. 30. The laser system of claim 28, further comprising one or more optical elements within the interior chamber, the one or more optical elements configured to receive the light output by the plurality of optical fibers, to modify the light, and to output a plurality of substantially elliptical beams of light. 31. The laser system of claim 28, wherein the flow cell connector is configured to removably attach the flow cell to the housing such that the flow cell is interchangeable. 32. The laser system of claim 28, wherein the housing is sealed to insulate the interior chamber from ambient air.