Time-resolved intersubband optical transitions in resonantly optically pumped semiconductor lasers

✍ Scribed by I Shtrichman; U Mizrahi; D Gershoni; E Ehrenfreund; K.D Maranowski; A.C Gossard

• Book ID: 104429597
• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 140 KB
• Volume: 7
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/s1386-9477(99)00299-4

✦ Synopsis

Using picosecond visible-pump mid-infrared-probe technique, we directly measured the photoexcited electron dynamics in the ÿrst conduction subband of a GaAs=AlGaAs quantum well laser, below and above its threshold. Our results clearly show that even at low temperatures, under optical excitation into the lowest heavy hole exciton resonance, GaAs=GaAlAs quantum well lasers lase in accordance with the common two-plasma model and not from an excitonic phase.