Abstract

We have investigated the far-infrared (FIR) optical properties and population relaxation dynamics of carriers and excitons in 100-Å GaAs–AlGaAs multiple quantum wells by visible–FIR pump–probe spectroscopy. Our experimental setup is capable of resolving transient changes of the complete complex amplitude transmission coefficient Δt/t between 0.3 and 2.3 THz with high sensitivity (|Δt/t| ≥ 5 × 10−4) and picosecond time resolution. Using picosecond laser pumping pulses to create excitons, we measured the exciton lifetime of 250 ps by monitoring the resulting transient 1s–2p exciton absorption (2.0 THz) of a picosecond FIR probing pulse. When free carriers were excited above the quantum-well band edge, we observed not only the decay of the free-carrier population but also the growth of the 1s exciton population between 10 and 100 ps. The latter effect is attributed to the relaxation of free carriers into the lowest (1s) exciton level.

© 1994 Optical Society of America

Full Article  |  PDF Article

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (6)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription