http://www.omicron-laser.de/english/las ... diode.html
Just found some more details about these lasers, they seem to have a bragg grating integrated in the active region of the LD and also contain wavelength selective elements in the external cavity, resulting in a very narrow linewidth light source with a coherence length of 250m. I have asked Omicron-Laserage for more details.The diode lasers of the Bluephoton® / Greenphoton® / Redphoton® DualDiode Series are temperature-stabilized lasing diode modules, with two laser diodes of equal wavelength, whose laser beams are united over special co-linear optics. Through this, it is possible to quasi-duplicate the powers of single mode laser diodes available on the market. The only difference to laser diode modules with only one laser diode is that the DualDiode laser diode modules indicate a crossed polarization. All other beam parameters are identical, which means double power with equal quality.
http://www.omicron-laser.de/files/pm_14 ... nglish.pdf