The DL RFA SHG pro system.

DL RFA SHG pro – 2 Watt output power at 589 nm.

May 02, 2011
Product news

Narrow-band 2 Watt laser at 589 nm

Diode-based system for laser cooling of sodium

The latest addition to TOPTICA’s SHG pro series of frequency-converted diode lasers is a novel continuous-wave system with an output power of 2 Watt at 589 nm. The new DL RFA SHG pro features a linewidth of less than 1 MHz and a mode hop free tuning range of more than 10 GHz and is thus ideally suited for laser cooling of sodium. It presents a stable and easy-to-use alternative to the intricate dye lasers used previously, that required frequent maintenance and water cooling.

The DL RFA SHG pro is based on a tunable external-cavity diode laser (ECDL) in TOPTICA’s proven pro design at 1178 nm. The output of the ECDL is amplified within a novel polarization-maintaining Raman fiber-amplifier (RFA), which preserves the spectral properties – in particular, the narrow linewidth – of the seed laser. Subsequently, the amplifier output is frequency doubled in a SHG pro resonator to the target wavelength of 589 nm. The system features an excellent beam profile and a high long-term power and frequency stability.

The DL RFA SHG pro is ideally suited for laser cooling and Bose-Einstein condensation of sodium atoms and is also of particular interest for mixed-atom systems. Special versions with output powers up to 20 Watt, e.g. for sodium-LIDAR, high-resolution microscopy or laser guide stars, are also available. And not being limited to 589 nm, the technology can be transferred to wavelengths between 560 and 640 nm (e.g. 583 nm for laser cooling of erbium), or extended to frequency-quadrupled systems between 280 nm and 310 nm (e.g. 285 nm for laser cooling of magnesium).


Key Features

  • 2W @ 589 nm for laser cooling of sodium
  • Single-frequency operation, linewidth < 1 MHz
  • Tunable, grating stabilized diode seed laser in pro design
  • Narrow band Raman Fiber amplification


The DL RFA SHG pro will be demonstrated live at LASER World of Photonics in Munich at the TOPTICA booth #B1.117.