Title :
Spectral characteristics of single-In/sub 0.7/Ga/sub 0.3/As quantum-well microring lasers
Author :
Corbett, Brandon
Author_Institution :
Nat. Microelectron. Res. Centre, Univ. Coll. Cork, Ireland
Abstract :
Low-threshold optically pumped microring and disk lasers containing a single compressive strained In0.7Ga/sub 0.3/As quantum well are characterized. Strong bandfilling in single quantum wells is used to show saturation of the background spontaneous emission in microrings compared with comparable microdisks. The continuous wave threshold pump power for a microring is as low as 2 μW (3 W/cm2) at liquid nitrogen temperatures. The lasers operate multimoded with wavelengths determined by whispering gallery modes of several orders.
Keywords :
III-V semiconductors; gallium arsenide; indium compounds; laser modes; optical pumping; optical saturation; photoluminescence; quantum well lasers; ring lasers; semiconductor laser arrays; spontaneous emission; 2 muW; In/sub 0.7/Ga/sub 0.3/As; background spontaneous emission; continuous wave threshold pump power; disk lasers; liquid nitrogen temperature; low-threshold optically pumped microring lasers; microdisks; multimode operation; saturation; single compressive strained In0.7Ga/sub 0.3/As quantum well; single quantum wells; single-In/sub 0.7/Ga/sub 0.3/As quantum-well microring lasers; spectral characteristics; strong bandfilling; whispering gallery modes; Laser excitation; Laser modes; Nitrogen; Optical pumping; Optical saturation; Pump lasers; Quantum well lasers; Spontaneous emission; Stimulated emission; Temperature;
Journal_Title :
Photonics Technology Letters, IEEE
