Passive and hybrid mode locking in multi-section terahertz quantum cascade lasers

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Tzenov, P.; Babushkin, I.; Arkhipov, R.; Arkhipov, M.; Rosanov, N. et al.: Passive and hybrid mode locking in multi-section terahertz quantum cascade lasers. In: New Journal of Physics 20 (2018), Nr. 5, 53055. DOI:

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Sum total of downloads: 103

It is believed that passive mode locking is virtually impossible in quantum cascade lasers (QCLs) because of too fast carrier relaxation time. Here, we revisit this possibility and theoretically show that stable mode locking and pulse durations in the few cycle regime at terahertz (THz) frequencies are possible in suitably engineered bound-to-continuum QCLs. We achieve this by utilizing a multi-section cavity geometry with alternating gain and absorber sections. The critical ingredients are the very strong coupling of the absorber to both field and environment as well as a fast absorber carrier recovery dynamics. Under these conditions, even if the gain relaxation time is several times faster than the cavity round trip time, generation of few-cycle pulses is feasible. We investigate three different approaches for ultrashort pulse generation via THz quantum cascade lasers, namely passive, hybrid and colliding pulse mode locking.
License of this version: CC BY 3.0 Unported
Document Type: article
Publishing status: publishedVersion
Issue Date: 2018
Appears in Collections:Fakultät für Mathematik und Physik

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pos. country downloads
total perc.
1 image of flag of Germany Germany 86 83.50%
2 image of flag of Moldova, Republic of Moldova, Republic of 2 1.94%
3 image of flag of United Kingdom United Kingdom 2 1.94%
4 image of flag of China China 2 1.94%
5 image of flag of Ukraine Ukraine 1 0.97%
6 image of flag of Slovakia Slovakia 1 0.97%
7 image of flag of Sweden Sweden 1 0.97%
8 image of flag of Saudi Arabia Saudi Arabia 1 0.97%
9 image of flag of Netherlands Netherlands 1 0.97%
10 image of flag of Korea, Republic of Korea, Republic of 1 0.97%
    other countries 5 4.85%

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