TY  - JOUR
AU  - Demirbas, Uemit
AU  - Rentschler, Christian
AU  - Zhang, Zhelin
AU  - Pergament, Mikhail
AU  - Matlis, Nicholas
AU  - Kärtner, Franz
TI  - Advantages of pulse-train excitation in narrow-band terahertz generation: mitigation of undesired nonlinear effects
JO  - Optical materials express
VL  - 14
IS  - 11
SN  - 2159-3930
CY  - Washington, DC
PB  - Optica
M1  - PUBDB-2024-06288
SP  - 2644
PY  - 2024
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001346226600007
DO  - DOI:10.1364/OME.541275
UR  - https://bib-pubdb1.desy.de/record/615827
ER  -