We report on a unique lasing mechanism observed in quantum dash Gain media. While the gain media is electrically pumped below lasing threshold, a strong optical pulse excites carriers by two photon absorption into high energy states of the quantum dashes and wetting layer. Fast inter band carrier relaxation and capture processes into the ground states of the quantum dashes result in increased gain followed by lasing at the gain peak irrespective of the stimulating pulse wavelength. The temporal response of the lasing line is examined on a 40 GHz scope and full characterization of the pulse by the XFROG scheme is performed. We show the lasing mechanism to be governed mainly by the wetting layer dynamics and extract a direct measurement of the carrier-carrier scattering time constant.
|Title of host publication||Proceedings of the European Conference on Optical Communication (ECOC) 2011|
|Publisher||Optical Society of America|
|Publication status||Published - 2011|
|Event||37th European Conference and Exhibition on Optical Communication - Geneva, Switzerland|
Duration: 18 Sep 2011 → 22 Sep 2011
Conference number: 37
|Conference||37th European Conference and Exhibition on Optical Communication|
|Period||18/09/2011 → 22/09/2011|
Bibliographical noteThis paper was published bt OSA and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/abstract.cfm?URI=ECOC-2011-Tu.6.LeSaleve.4. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
Capua, A., Saal, A., Reithmaier, J. P., Yvind, K., & Eisenstein, G. (2011). Two Photon Induced Lasing in 1550 nm Quantum Dash Optical Gain Media. In Proceedings of the European Conference on Optical Communication (ECOC) 2011 (pp. Tu.6.LeSaleve). Optical Society of America. http://www.ecoc2011.org/