Spiral-shaped microcavity laser: a new class of semiconductor laser
A spiral-shaped microcavity structure is used to achieve uni-direcitonal laser emission from a microresonator. This was previously demonstrated with an InGaN MQW microdisk laser emitting near 400 nm and is demonstrated here with room-temperature laser operation of an AlGaAs heterostructure with pulsed threshold current densities as low as 400 A/cm2, emission wavelength near 730 nm, and output power of more than 4 mW. Continuous-wave operation of an AlGaAs microdisk laser is also demonstrated for a disk radius of 50 ìm.
Kneissl, M. A. ; Teepe, M. R. ; Miyashita, N. ; Chern, G. D.; Chang, R. K.; Johnson, N. M. Spiral-shaped microcavity laser: a new class of semiconductor laser. Proceedings of the 27th International Conference on the Physics of Semiconductors; 2004 July 26-30; Flagstaff; AZ.