SodiumStar

  • Laser Guide Star for adaptive optics systems
  • Excitation of atmospheric Sodium @ 589nm
  • > 20W cw output power, linewidth < 5 MHz
  • 2 W version available for laser cooling of Sodium

The SodiumStar system is a high-power “guide star” laser designed for adaptive optics control in ground-based telescopes. It is based on resonant frequency doubling of an infrared DFB diode laser with subsequent Raman fiber amplifier. More than 20 W are attained at the Sodium wavelength of 589 nm, with a spectral width of 5 MHz. The DL RFA SHG pro, a modified, sub MHz linewidth version with moderate power (2 W) is available for laser cooling experiments.

Specifications

Specifications

Schematic setup of TOPTICA’s SodiumStar guide star laser.

 

Output power of TOPTICA’s SodiumStar laser, as a function of fundamental (infrared) power. Resonant frequency conversion is achieved with an efficiency in excess of 75 %.

 

Specifications:

Wavelength589 nm
Seed laserDL DFB
AmplifierRaman fiber amplifier
Doubling stageSHG pro
Tuning> 10 GHz
OperationSingle frequency
Linewidth˜ 5 MHz
Output power> 20 W
Spatial modeNear diffraction limited
Optical isolationIncluded, 60 dB + 35 dB (before / after amplifier)
Beam steeringIncluded
Water coolingYes (for amplifier stage)
Operating voltage220 .. 240 V AC, 50 Hz
Power consumption1.3 kW max.


Options & Related Products

Options & Related Products

Related Products:

Applications

Applications

Guide Star laser in operation at the Very Large Telescope on Cerro Paranal, Chile. The LGS excites the Sodium atoms which are present in the mesosphere, 90 to 110 km above the Earth’s surface and creates an "artificial star".

 

 

Adaptive optics systems correct wavefront aberrations (top row) caused by atmospheric distortions, rendering the images of stars point-like (bottom row).

 

Application Note

Laser Guide Star

 

Articles

Reaching for the stars, (Laser+Photonics - Made in Germany, Austra & Swizerland 2011, p.28)

Laser Guide Star Facility Upgrade (S. Lewis et al., Messenger No. 155 (March 2014)

 

Scientific Publications

Y. Feng et al., 25 W Raman-fiber-amplifier-based 589 nm laser for laser guide star; Opt. Express 17:21 (2009) 19021.

Download

Download

Brochure: Scientific Lasers (PDF, 8.1 MB)
Brochure: Scientific Lasers (PDF, 8.1 MB)
toptica_BR_Scientific_Lasers_10.pdf
Brochure: Specifications & Configurations Frequency Converted Diode Lasers
Brochure: Specifications & Configurations Frequency Converted Diode Lasers
toptica_BR_Frequency_Converted_Lasers_04.pdf
Press release: TOPTICA is awarded 5.2 Mio € Contract by ESO for Sodium Guide Star Facility
Press release: TOPTICA is awarded 5.2 Mio € Contract by ESO for Sodium Guide Star Facility
100624_PR_ESO_TOPTICA_Contract_01.pdf

Video

Guide Star Laser for VLT: Tilt Test

 

Guide Star laser for adaptive optics system at the Very Large Telescope (VLT) at Paranal, chile.Challenges for laser operation: altitude, earthquake-resistant design and gravity-invariant operation. TOPTICA's guide star laser delivers a constant oupot power of 22 W at 589 nm.