Precise photoelectrochemical tuning of semiconductor microdisk lasers

Threshold characteristics of semiconductor microdisk lasers

Whispering-gallery mode microdisk lasers using optical’ and electrical2 excitation have recently been demonstrated. The initial experiments* and results described here use continuous-wave optical excitation at liquid-nitrogen temperatures. The threshold characteristics of these microlasers are studied here as the small volume limit is approached where there is a single optical mode within the g...

Active control of emission directionality of semiconductor microdisk lasers

Optical feedback and the coupling problem in semiconductor microdisk lasers

The smaller the size of a light-emitting microcavity, the more important it becomes to understand the effects of the cavity boundary on the optical mode profile. Conventional methods of laser physics, such as the paraxial approximation, become inapplicable in many of the more exotic cavity designs to be discussed here. Cavities in the shape of microdisks, pillars and rings can yield low lasing ...

The spectrum of microdisk lasers

A model for quantitative analysis of microdisk laser emission spectra is presented. Conformal mapping is used to determine radial and azimuthal eigenvalues, eigenvectors, and cavity Q corresponding to leaky optical resonances in an optically transparent dielectric disk. The effects of gain and loss in a microcavity active medium are also included in the model. Our results compare well with expe...

Dynamics of GaAsÕAlGaAs microdisk lasers

Dynamic response of a GaAs/AlGaAs microdisk laser has been experimentally investigated using femtosecond optical pumping. Below the lasing threshold, the delay time of the emission pulse from the microdisk hardly changes with the pump power. Above the lasing threshold, the delay time is shortened dramatically, and it decreases with increasing the pump power. The theoretical simulation based on ...