Multiple co-integrated glass lasing structures for THz generation

Lasers on glass exhibit thermal stability and a very narrow linewidth compatible with frequency generation. In this work, we report the fabrication of single-mode co-integrated lasers on the same Er:Yb doped glass substrate. By modifying the laser design, optical frequencies separated by 50 to 280 GHz have can be generated having milli-watts optical power. Such signals can be converted to THz signal using a wide bandwidth photodiode. THz beating frequencies up to 280 GHz are reported in these preliminary results. In this work, we demonstrated the first THz source made of co-integrated Erbium-doped DFB laser. A maximum power of 140 nW at 140.0 GHz was measured, with a conversion efficiency of 7%.