Journal Article

PUBDB-2024-06288

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Advantages of pulse-train excitation in narrow-band terahertz generation: mitigation of undesired nonlinear effects

Demirbas, U. (First author)Extern*CFEL*DESY* ; Rentschler, C.CFEL*DESY* ; Zhang, Z.Extern* ; Pergament, M.CFEL*DESY* ; Matlis, N.CFEL*DESY* ; Kärtner, F. (Corresponding author)CFEL*XFEL.EU*DESY*

2024
Optica Washington, DC

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Please use a persistent id in citations: doi:10.1364/OME.541275  doi:10.3204/PUBDB-2024-06288

Abstract: In this work, we have studied the limitations of narrowband multi-cycle (MC)terahertz (THz) generation via optical rectification (OR) in periodically-poled lithium niobate(PPLN) crystals. Detailed investigation of the transmitted beam profile, THz conversionefficiency (CE), and parasitic second-harmonic generation (SHG) strength as a function ofincident pump beam size showed that Kerr-lensing is a significant bottleneck in the efficiencyscaling of MC THz generation. We have also demonstrated that compared to the usage of asingle pump pulse, excitation of the PPLN crystal via a pulse train, not only boosts up THzCE and narrows down the bandwidth of the achieved THz beam but also helps to mitigate theeffect of undesired nonlinearities, such as Kerr-lensing, and parasitic SHG.

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Contributing Institute(s):

1. Ultrafast Lasers & X-rays Division (FS-CFEL-2)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. AXSIS - Frontiers in Attosecond X-ray Science: Imaging and Spectroscopy (609920) (609920)
3. DFG project G:(GEPRIS)405983224 - Erzeugung von Sub-Picosekunden Elektronenpaketen durch starke THz-Felder für Hochfeld- Elektronenbeschleunigung und ultraschnelle Elektronen-beugende Bildgebung (405983224) (405983224)

Experiment(s):

1. AXSIS: Frontiers in Attosecond X-ray Science, Imaging and Spectroscopy

Appears in the scientific report 2024

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