Abstract
TOPTICA Projects GmbH is the leading supplier of sodium guide star laser technology to all major ground-based VIS/IR observatories. SodiumStar lasers combine a single-frequency diode-based seeder, Raman fiber amplifier technology and resonant frequency doubling. They emit > 20 W of narrow-linewidth (~ 5 MHz) continuous-wave radiation at sodium D2a resonance and include an integrated D2b re-pumping scheme for maximum return flux. Apart from the unique optical characteristics, emphasis has been placed on supplying astronomers with modular turn-key systems that are absolutely reliable even under harsh environmental conditions and in remote locations. Applications beyond astronomy include atmospheric magnetometry, space situational awareness, and free-space optical communication, in particular feeder links to LEO and GEO satellites as well as deep space probes.
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