Song, W.Vasdekis, A.E.Li, Z.Psaltis, D.2010-11-232010-11-232010-11-23200910.1063/1.30797992-s2.0-59849109220https://infoscience.epfl.ch/handle/20.500.14299/58119WOS:000263167000017We report the demonstration of low order distributed feedback (DFB) optofluidic dye lasers with reduced threshold. The laser chips were realized in polydimethylsiloxane using replica molding with two masters. A comparison between first, second, and third order DFB dye lasers was performed, while the second order DFB dye laser exhibited the lowest pump threshold of 78 nJ/pulse. Compared to previous reports on higher order Bragg grating structures, the pump threshold in this work is approximately 30-fold lower than the state of the art due to the reduction in the cavity losses and the more efficient pumping configuration. © 2009 American Institute of Physics.Bragg gratingsdistributed feedback lasersdye lasersmicrofluidicsmouldingoptical lossestext::journal::journal article::research article