Abstract
We study the possibility for ultrashort pulse generation from THz quantum cascade lasers via the colliding pulse mode locking technique. Our analysis shows that this approach could enable sub-ps pulses from QCLs, even in devices with carrier recovery times as short as ~ 10 ps.
Highlights
Despite being the most potent and compact direct sources of THz light, due to their dynamic complexity and fast carrier relaxation times, quantum cascade lasers (QCLs) have proven to be difficult to mode lock
Passive mode locking has not been demonstrated to date, as it is widely believed that the fast gain recovery time would naturally inhibit the application of this standard technique
We propose the usage of colliding pulse mode locking (CPML) for the generation of few cycle terahertz pulses from QCLs
Summary
Despite being the most potent and compact direct sources of THz light, due to their dynamic complexity and fast carrier relaxation times, quantum cascade lasers (QCLs) have proven to be difficult to mode lock. Passive mode locking has not been demonstrated to date, as it is widely believed that the fast gain recovery time would naturally inhibit the application of this standard technique.
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