Photonic crystal distributed feedback quantum cascade laser fabricated with holographic technique

Electrically pumped, edge-emitting, singlemode operation of a two-dimensional photonic crystal distributed feedback (PCDFB) quantum cascade laser emitting at similar to 7.8 mu m is demonstrated. The two-beam holographic technique combined with wet-etching process is successfully used to de. ne a square-lattice PCDFB structure on the top grating layer of the laser. This simple PC fabrication method may open exciting opportunities for the wide application of PCDFB lasers.

National Science Fund for Distinguished Young Scholars 60525406 607360312006CB604903 2007AA03Z446 This work was supported by the National Science Fund for Distinguished Young Scholars and other Research Projects of China ( grant numbers 60525406, 60736031, 2006CB604903, 2007AA03Z446, respectively).