Abstract
Quantum-dot microdisk lasers coated with different dielectric layers transparent in spectral diapason of laser radiation were studied. We observe that the coating influences the mode spectra of the microlasers, reduces the resonator Q factor and improves their thermal resistance.
Highlights
In recent years, semiconductor microlasers based on whispering gallery mode (WMG) resonators have attracted increased attention
WGMs are based on effect of total internal reflection
In this work we study spectral and lasing characteristics of microdisk lasers with InAs/InGaAs quantum dots active region coated with different dielectric layers transparent in spectral diapason of laser radiation (SU-8 photoresist and TiO2) and compare the results with characteristics of the micordisks without coating
Summary
Semiconductor microlasers based on whispering gallery mode (WMG) resonators have attracted increased attention. Lasing in different types of semiconductor microdisks [7,8,9] as well as influence of surrounding material on WGM mode frequencies in various passive microspherical resonators (sensors) [5,6] has been reported. In this work we study spectral and lasing characteristics of microdisk lasers with InAs/InGaAs quantum dots active region coated with different dielectric layers transparent in spectral diapason of laser radiation (SU-8 photoresist and TiO2) and compare the results with characteristics of the micordisks without coating (air environment).
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