Title :
Temporal and spectral dynamics in multiquantum-well semiconductor saturable absorbers
Author :
Hofmann, M. ; Fröjdh, K. ; Brorson, S.D. ; Mork, J.
Author_Institution :
Fachbereich Phys., Philipps-Univ., Marburg, Germany
fDate :
5/1/1997 12:00:00 AM
Abstract :
Performing femtosecond pump-probe measurements on multiquantum-well (MQW) semiconductor saturable absorbers we find a strong spectral dependence of the absorption dynamics on a picosecond time scale. While for long wavelengths a pump pulse induced reduction of the absorption is observed, at short wavelengths the absorption increases due to the pump. We explain this behavior on the basis of a model including photo-induced field screening.
Keywords :
high-speed optical techniques; laser accessories; laser mode locking; optical pumping; optical saturable absorption; semiconductor lasers; semiconductor quantum wells; MQW semiconductor saturable absorbers; absorption dynamics; femtosecond pump-probe measurements; mode locked laser diode saturable absorbers; multiquantum-well semiconductor saturable absorbers; photo-induced field screening; picosecond time scale; pump pulse induced reduction; short wavelengths; spectral dynamics; strong spectral dependence; temporal dynamics; Absorption; Diode lasers; Laser modes; Optical pulses; Optical waveguides; Probes; Pump lasers; Quantum well devices; Semiconductor lasers; Ultrafast optics;
Journal_Title :
Photonics Technology Letters, IEEE
