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Soliton self-compression and spectral broadening of 1 μm femtosecond pulses in single-domain KTiOPO4
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.ORCID iD: 0000-0002-4452-0759
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
Department of Physics, Lund University, PO Box 118, SE-22100, Lund, Sweden.
Department of Physics, Lund University, PO Box 118, SE-22100, Lund, Sweden.
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2019 (English)In: Proceedings of the 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference, 2019Conference paper, Published paper (Refereed)
Abstract [en]

Summary form only given. Efficient, diode-pumped high energy femtosecond laser systems around 1 μm based on Yb-gain media are readily commercially available. However, owing to the gain bandwidth limitations, the pulses generated in such lasers are substantially longer than the ones generated in Ti:Sapphire systems. A simple, energy-scalable pulse self-compression scheme for the pulses around 1 μm thus would be of great interest for many applications, including time-resolved pump-probe spectroscopy, high-harmonics generation, etc. The self-phase modulation during nonlinear propagation in filaments in gasses is often employed for pulse self-compression. Such schemes typically require rather bulky setups and careful control of group velocity dispersion. Some years ago it has been shown theoretically that Raman-active molecules in gaseous form could be used for mid-infrared pulse compression. Here we exploit highly-efficient interaction of optical pulses with phonon-polaritons in KTi0PO4 (KTP) for self -compression of fs pulses at 1 gm. The experimental setup consists of a 1030 nm femtosecond pump laser. The pulses were loosely focused by a f=150 mm lens to a beam waist with 1/e 2 radius of 160 gm in a 10 mm -long, 5mm-thick single -domain KTP sample. The pulses were polarized along the c -axis of the crystal. The dependence of the pulse output spectrum as a function of the beam focus position in the crystal is shown, where 300 fs full width at half maximum (FWHIVI) input pulses from a fiber -based system were employed. The broadest spectrum was obtained with the focal plane being located close to the entrance of the crystal. We employed time resolved digital holography to verify the coupling of the optical pulse with phonon-polariton wave during propagation through the crystal. Characterization experiments with 173 fs FWIINI pulses derived from a commercial solid-state laser system were conducted using a custom-built d -scan setup [6]. The setup included chirped mirror...

Place, publisher, year, edition, pages
2019.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-268258DOI: 10.1109/CLEOE-EQEC.2019.8872490Scopus ID: 2-s2.0-85074666582OAI: oai:DiVA.org:kth-268258DiVA, id: diva2:1424512
Conference
2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019
Note

QC 20200417

Available from: 2020-04-17 Created: 2020-04-17 Last updated: 2020-04-17Bibliographically approved

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Publisher's full textScopushttps://ieeexplore.ieee.org/document/8872490

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Viotti, Anne-LiseLaurell, FredrikPasiskevicius, Valdas

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