Research / Instrumentation development
>> Achieving sub-100 fs time resolution with tunable probe photon energy of 5.3-7.0 eV by a newly designed fs KBBF
>> Tunable probe photon energy (5.3-7.0 eV) for investigating the dynamics of 3D materials
>> Achieving 81 fs time resolution, and diagnostics for achieving optimum time resolution
>> Other systems
>> Achieving sub-100 fs time resolution with tunable probe photon energy of 5.3-7.0 eV by a newly designed fs KBBF [Back To Top]
By using a combination of BBO and KBBF, we have successfully generated 5.3-7.0 eV probe pulses, with an overall time resolution of ~300 fs. In order to further push the time resolution to below 100 fs, we have designed a new KBBF device for fs applications, which has a reduced KBBF crystal and coupling prism size. By using this newly designed KBBF device, together with the full diagnostics and optimization for time resolution, we are able to push the time resolution to be better than 100 fs for the entire probe photon energy range of 5.3-7.0 eV. In particular, the best achievable TrARPES time resolution is 84 fs, which gives a probe pulse duration of 55 fs after subtracting the contribution from the pump beam. Such fs KBBF device extends the application of KBBF crystal to high time-resolution TrARPES with a tunable VUV probe source exceeding conventional BBO-based TrARPES, and also extends tunable KBBF-based device to other time-resolved measurements where ultrafast extreme ultraviolet source is important.
[To Overview]
>> Tunable probe photon energy (5.3-7.0 eV) for investigating the dynamics of 3D materials [Back To Top]
• We have achieved ~300 fs time resolution in our TrARPES system with a widely tunable probe photon energy of 5.3 - 7.0 eV by using BBO+KBBF scheme.
• By using a thinner crystal with optimized compression, we can further push down the time resolution to better than 100 fs.
• The probe photon energy tunability together with the high resolution opens up opportunities for investigating the dynamics of three-dimensional materials.
Scientific cases:
1. “Light-tunable surface state and hybridization gap in a magnetic topological insulator MnBi8Te13”, Nano Lett. 21, 14, 6080-6086 (2021).
2. “Self-energy dynamics and mode-specific phonon threshold effect in a Kekulé-ordered graphene”, Natl. Sci. Rev. nwab17 (2021)
3. “Population inversion and Dirac fermion cooling in 3D Dirac semimetal Cd3As2”, Nano Lett. 22, 3, 1138–1144 (2022).
Combined system:
[To Overview]
>> Achieving 81 fs time resolution, and diagnostics for achieving optimum time resolution [Back To Top]
[To Overview]
>> Other systems [Back To Top]
