In one embodiment, a laser system includes a seed laser diode configured to produce a free-space seed-laser beam and a seed-laser lens configured to collimate the seed-laser beam. The laser system also includes a pump laser diode configured to produce a free-space pump-laser beam and a pump-laser le
In one embodiment, a laser system includes a seed laser diode configured to produce a free-space seed-laser beam and a seed-laser lens configured to collimate the seed-laser beam. The laser system also includes a pump laser diode configured to produce a free-space pump-laser beam and a pump-laser lens configured to collimate the pump-laser beam. The laser system further includes an optical-beam combiner configured to combine the collimated seed-laser and pump-laser beams into a combined free-space beam and a focusing lens configured to focus the combined beam. The laser system also includes an optical gain fiber that includes an input end configured to receive the focused beam. The laser system also includes a mounting platform, where one or more of the seed laser, the seed-laser lens, the pump laser, the pump-laser lens, the combiner, the focusing lens, and the input end of the gain fiber are mechanically attached to the platform.
대표청구항▼
1. A laser system comprising: a seed laser diode configured to produce a free-space seed-laser beam;a seed-laser lens configured to collimate the seed-laser beam;a pump laser diode configured to produce a free-space pump-laser beam;a pump-laser lens configured to collimate the pump-laser beam;an opt
1. A laser system comprising: a seed laser diode configured to produce a free-space seed-laser beam;a seed-laser lens configured to collimate the seed-laser beam;a pump laser diode configured to produce a free-space pump-laser beam;a pump-laser lens configured to collimate the pump-laser beam;an optical-beam combiner configured to combine the collimated seed-laser and pump-laser beams into a combined free-space beam;a focusing lens configured to focus the combined beam;an optical gain fiber comprising an input end configured to receive the focused beam; anda mounting platform, wherein one or more of the seed laser diode, the seed-laser lens, the pump laser diode, the pump-laser lens, the optical-beam combiner, the focusing lens, and the input end of the optical gain fiber are mechanically attached to the mounting platform. 2. The laser system of claim 1, wherein the mounting platform comprises a glass, ceramic, semiconductor, or metal material having a relatively low coefficient of thermal expansion or a relatively high thermal conductivity. 3. The laser system of claim 1, wherein the mounting platform comprises one or more mechanical registration features configured to define a fixed position on the mounting platform for each of one or more of the seed laser diode, the seed-laser lens, the pump laser diode, the pump-laser lens, the optical-beam combiner, the focusing lens, and the input end of the optical gain fiber. 4. The laser system of claim 3, wherein: the mounting platform comprises silicon or a silicon-based material; andthe mechanical registration features are produced through a microfabrication process applied to the mounting platform. 5. The laser system of claim 3, wherein one or more of the seed laser diode, the seed-laser lens, the pump laser diode, the pump-laser lens, the optical-beam combiner, the focusing lens, and the input end of the optical gain fiber are mechanically attached to the mounting platform using a passive-alignment technique based on the mechanical registration features. 6. The laser system of claim 1, wherein one or more of the seed laser diode, the seed-laser lens, the pump laser diode, the pump-laser lens, the optical-beam combiner, the focusing lens, and the input end of the optical gain fiber are mechanically attached to the mounting platform using an active-alignment technique. 7. The laser system of claim 1, wherein each of the seed laser diode, the seed-laser lens, the pump laser diode, the pump-laser lens, the optical-beam combiner, the focusing lens, and the input end of the optical gain fiber are mechanically attached to the mounting platform using either a passive-alignment technique or an active-alignment technique. 8. The laser system of claim 1, wherein one or more of the seed laser diode, the seed-laser lens, the pump laser diode, the pump-laser lens, the optical-beam combiner, the focusing lens, and the input end of the optical gain fiber are mechanically attached to the mounting platform by epoxy, solder, or one or more mechanical fasteners. 9. The laser system of claim 1, wherein the mounting platform is contained within an enclosure comprising a feedthrough for the optical gain fiber, wherein the enclosure is configured to be purged with an inert gas and sealed. 10. The laser system of claim 1, further comprising an optical isolator configured to transmit the collimated seed-laser beam and prevent light from propagating back toward the seed laser diode. 11. The laser system of claim 1, further comprising: a seed-laser detector configured to receive light emitted from a back facet of the seed laser diode; anda pump-laser detector configured to receive light emitted from a back facet of the pump laser diode. 12. The laser system of claim 1, wherein the pump-laser lens comprises: a fast-axis collimating lens; anda slow-axis collimating lens. 13. The laser system of claim 1, wherein: the seed laser diode is configured to produce light at a wavelength between approximately 1500 nm and approximately 1600 nm; andthe pump laser diode is configured to produce light at a wavelength between approximately 900 nm and approximately 1000 nm. 14. The laser system of claim 1, wherein the seed laser diode is configured to be operated in a pulsed mode wherein the seed-laser beam comprises optical pulses having a pulse duration less than or equal to 10 nanoseconds and a duty cycle less than or equal to 1%. 15. The laser system of claim 1, wherein the optical gain fiber is configured to: absorb, by a gain material of the optical gain fiber, at least part of the pump-laser portion of the received beam; andamplify, by the gain material, the seed-laser portion of the received beam. 16. The laser system of claim 1, wherein the input end of the optical gain fiber comprises an input face with an anti-reflection coating having a low optical reflectivity at a wavelength of the seed laser or a wavelength of the pump laser. 17. The laser system of claim 1, wherein the optical gain fiber comprises a fiber Bragg grating configured to reflect a portion of light from the pump-laser beam back to the pump laser diode. 18. The laser system of claim 1, wherein the laser system is part of a lidar system comprising a scanner and a receiver, wherein: the laser system provides pulses of light to the scanner;the scanner scans at least a portion of the pulses of light across a field of regard of the lidar system; andthe receiver detects at least a portion of the scanned pulses of light scattered by a target located a distance from the lidar system. 19. The laser system of claim 1, further comprising a booster amplifier comprising: an output end of the optical gain fiber, wherein the output end is configured to produce a free-space amplified beam comprising light from the seed laser diode that is amplified while propagating through the optical gain fiber;a collimating lens configured to collimate the amplified beam;a booster-amplifier pump laser diode configured to produce a free-space booster-amplifier pump-laser beam;a booster-amplifier lens configured to collimate the booster-amplifier pump-laser beam;a booster-amplifier beam combiner configured to combine the collimated amplified beam and the collimated booster-amplifier pump-laser beam into a combined booster-amplifier beam;a booster-amplifier focusing lens configured to focus the combined booster-amplifier beam;a multi-clad gain fiber comprising an input end configured to receive the combined booster-amplifier beam; anda booster-amplifier mounting platform, wherein one or more of the output end of the optical gain fiber, the collimating lens, the booster-amplifier pump laser diode, the booster-amplifier lens, the booster-amplifier beam combiner, the booster-amplifier focusing lens, and the input end of the multi-clad gain fiber are mechanically attached to the mounting platform. 20. The laser system of claim 19, wherein the multi-clad gain fiber is a dual-clad gain fiber comprising a core, an inner cladding, and an outer cladding, wherein the core, inner cladding, and outer cladding each comprises a glass material. 21. The laser system of claim 19, wherein the multi-clad gain fiber is a triple-clad gain fiber comprising a core, and three cladding layers, wherein the core and cladding layers each comprises a glass material. 22. The laser system of claim 19, further comprising a filter configured to remove amplified spontaneous emission light from the free-space amplified beam. 23. The laser system of claim 19, further comprising a beam pick-off and a detector configured to detect a portion of the free-space amplified beam reflected from the beam pick-off. 24. The laser system of claim 19, further comprising an output collimator disposed at an output end of the multi-clad gain fiber, wherein the output collimator is configured to produce a collimated free-space output beam having optical characteristics comprising: a wavelength between approximately 1500 nm and approximately 1600 nm;a pulse duration less than or equal to 10 nanoseconds;a duty cycle less than or equal to 1%;a pulse energy greater than or equal to 100 nanojoules; anda peak power greater than or equal to 100 watts.
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