Mode-locking of a terahertz laser by direct phase synchronization.
J. Maysonnave,Kenneth Maussang,Joshua R. Freeman,Nathan Jukam,Julien Madéo,P. Cavalié,R. Rungsawang,Suraj P. Khanna,Edmund H. Linfield,Alexander Giles Davies,Harvey E. Beere,David A. Ritchie,Sukhdeep Dhillon,Jérôme Tignon +13 more
TL;DR: A novel scheme to achieve mode-locking of a multimode laser by multimode injection seeding with an external terahertz pulse, resulting in phase mode-locked terAhertz laser pulses of 9 ps duration, characterized unambiguously in the time domain.
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Abstract: A novel scheme to achieve mode-locking of a multimode laser is demonstrated. Traditional methods to produce ultrashort laser pulses are based on modulating the cavity gain or losses at the cavity roundtrip frequency, favoring the pulsed emission. Here, we rather directly act on the phases of the modes, resulting in constructive interference for the appropriated phase relationship. This was performed on a terahertz quantum cascade laser by multimode injection seeding with an external terahertz pulse, resulting in phase mode-locked terahertz laser pulses of 9ps duration, characterized unambiguously in the time domain.
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Citations
Narrow-band injection seeding of a terahertz frequency quantum cascade laser: Selection and suppression of longitudinal modes
Hanond Nong,Shovon Pal,Sergej Markmann,Negar Hekmat,Reshma A. Mohandas,Paul Dean,Lianhe Li,Edmund H. Linfield,A. Giles Davies,Andreas D. Wieck,Nathan Jukam +10 more
TL;DR: In this paper, a periodically poled lithium niobate (PPLN) crystal with multiple poling periods is used to generate tunable narrow-bandwidth THz pulses for injection seeding a quantum cascade laser (QCL).
Multi-mode lasing in terahertz metasurface quantum-cascade VECSELs
TL;DR: In this paper, a VECSEL external cavity is demonstrated using an output coupler based upon a high-resistivity silicon etalon, which presents a periodic reflectance spectrum that is nearly matched with the external cavity mode spectrum.
•Dissertation
Toward High Performance Broad-band Frequency Comb Operation of Terahertz Quantum Cascade Lasers
Chao Xu
- 16 May 2017
3
Spectral modification of the laser emission of a terahertz quantum cascade laser induced by broad-band double pulse injection seeding
Sergej Markmann,Hanond Nong,Shovon Pal,Negar Hekmat,Sven Scholz,Nadezhda Kukharchyk,Arne Ludwig,Sukhdeep Dhillon,Jérôme Tignon,Xavier Marcadet,Claudia Bock,Ulrich Kunze,Andreas D. Wieck,Nathan Jukam +13 more
TL;DR: In this article, the authors demonstrate that the spectral emission of a terahertz (THz) quantum cascade laser (QCL) can be modified with broad-band THz pulses whose bandwidths are greater than the QCL bandwidth.
3
Ultrafast Buildup Dynamics of Terahertz Pulse Generation in Mode-Locked Quantum Cascade Lasers
Feihu Wang,Xiaoqiong Qi,Valentino Pistore,Lianhe Li,Gary Agnew,Edmund H. Linfield,Giles Davies,Jérôme Tignon,Juliette Mangeney,Aleksandar D. Rakić,Sukhdeep Dhillon +10 more
TL;DR: In this paper , the authors theoretically and experimentally show the amplitude and phase-resolved buildup of pulse generation through active mode locking, from initiation of pulse generator to the nanosecond steady state.
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