Virginia Tech. Department of Materials Science and EngineeringAsryan, Levon V.2015-05-212015-05-212006-01-01Asryan, L. V. (2006). Limitations on standard procedure of determining internal loss and efficiency in quantum dot lasers. Journal of Applied Physics, 99(1). doi: 10.1063/1.21590720021-8979http://hdl.handle.net/10919/52436Limitations are discussed on the use in quantum dot (QD) lasers of the conventional method of determining internal loss coefficient alpha(int) and internal quantum efficiency eta(int) from a measured plot of the reciprocal slope efficiency versus the cavity length L. The limitations are imposed by the L-dependence of alpha(int) and eta(int) themselves. The effect of internal loss is quantitatively analyzed, which originates from the dependence of alpha(int) on the carrier density, with the latter being L-dependent. In short cavities, a plot of the reciprocal slope efficiency versus L can significantly deviate from a straight line, thus limiting the practicality of the standard procedure. For L longer than several hundred mu m, the limitations are strong in a single-QD-layer laser and moderate in a multiple-QD-layer laser. (c) 2006 American Institute of Physics.5 pagesapplication/pdfen-USIn CopyrightQuantum dotsQuantum wellsCarrier densityLaser resonatorsCharge injectionArticle - Refereedhttp://scitation.aip.org/content/aip/journal/jap/99/1/10.1063/1.2159072https://doi.org/10.1063/1.2159072