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Journals and Conferences
We study the feedback-induced instabilities in a quantum dot semiconductor laser emitting in both ground and excited states. Without optical feedback the device exhibits dynamics corresponding to… (More)
We have measured the spontaneous emission rates, absorption, and gain spectra of quantum dots between 20 K and 350 K using the segmented contact method, exploiting self assembled dots with a bimodal… (More)
We analyse the properties of GaAs based quantum dot semiconductor lasers emitting near 1310 nm. The line-width enhancement factor is shown to depend strongly on device temperature, ranging from 1.5… (More)
Measurements of the unamplified spontaneous emission spectra from 80 K to 350 K of a dot ensemble show clear evidence for increased population of higher lying states in the inhomogeneous distribution… (More)
Sub-picosecond optical pulses are demonstrated in a two-section passively mode locked InAs quantum dot laser structure using a randomly populated distribution and a proton bombarded absorber.
Combining measurements of gain spectra in InAs dots and calculations of state-filling in the inhomogeneous distribution, the gain peak shifts due to many body interactions alone are up to 14 meV… (More)
We examine in detail the relation between the optical gain spectra, mode-locked optical emission spectra, and temporal optical pulse widths as a function of temperature between 80 and 300 K in… (More)
Measured carrier temperatures of quantum dots lasers, between 200 K and 400 K, are different to that of the lattice and depend on doping type. This has consequences for thresholds and device models.
We experimentally observe truly random to non-thermal to thermal distribution of population of InAs quantum dots with temperature using unamplified spontaneous emission and measure the impact on… (More)
Using a rate equation model we quantitatively reproduce experimental results showing the transition from random to thermal population across the whole temperature range and measure the impact on… (More)