Lasing action in colloidal CdS∕CdSe∕CdS quantum wells

Jianfeng Xu, Min Xiao
2005 Applied Physics Letters  
Lasing action is observed in random medium of colloidal CdS/ CdSe/ CdS quantum wells ͑QWs͒ at 77 K. Sharp lasing peaks appear over a broad spectral range as pumping power increases. The lasing threshold is around 3 W / cm 2 , which is much lower than that of other random or nanocrystal laser systems. Such improvement in lasing threshold opens the door to practical applications of QW random laser. The characteristic cavity length is determined by the Fourier transform of the lasing spectrum.
doi:10.1063/1.2119423 fatcat:5jfjg5a3wffq3k5ew7idpyrgqy